Properties of TiN-matrix coating deposited by reactive HVOF spraying.
Abstract TiN-matrix coating was prepared by reactive high velocity oxygen fuel High Velocity Oxy-Fuel (HVOF) is a thermal spray technique used to deposit protective coatings on a substrate. HVOF Process
A blend of fuel (gaseous or liquid) and oxygen is injected into a torch and burned. (HVOF HVOF High Velocity Oxygen Fuel ) spraying on carbon steel based on the self-propagating high temperature synthesis (SHS SHS Shares (stock)
SHS SAW (Surface Acoustic Wave) Humidity Sensor
SHS Sciences Humaines et Sociales (French: Social Sciences)
SHS Student Health Service
SHS Second Hand Smoke ) technique in air. The phase composition, structures, and properties of TiN-matrix coating were analyzed using XRD XRD X-Ray Diffraction
XRD X-Ray Diode , EDS (Electronic Data Systems, Plano, TX, www.eds.com) Founded in 1962 by H. Ross Perot (independent candidate for the President of the U.S. in 1992), EDS is the largest outsourcing and data processing services organization in the country. , SEM and Vickers microhardness equipment. The anti-corrosion property in nearly neutral 3.5 wt% NaCl electrolytic e·lec·tro·lyt·ic
1. Of or relating to electrolysis.
2. Produced by electrolysis.
3. Of or relating to electrolytes.
e·lec solution was measured. The Weibull distribution In probability theory and statistics, the Weibull distribution (named after Waloddi Weibull) is a continuous probability distribution with the probability density function
AISI African Information Society Initiative
AISI Alberta Initiative for School Improvement (Canada)
AISI As I See It
AISI American International Supply, Inc (Oakland, CA) 316L stainless steel stainless steel: see steel.
Any of a family of alloy steels usually containing 10–30% chromium. The presence of chromium, together with low carbon content, gives remarkable resistance to corrosion and heat. . The microhardness values from [1137HV0.sub.0.05] to [825HV.sub.1], are relatively high and have indentation in·den·ta·tion
A notch, a pit, or a depression. size effect (ISE Ise (ē`sā), city (1990 pop. 104,164), Mie prefecture, S Honshu, Japan, on Ise Bay. It is one of the foremost religious centers of Shinto, the site of the shrines of Ise. ). With the increment of m, which increases with the increment of applied load, the microhardness values are more concentrated. The average value of apparent fracture toughness [K.sub.IC] is 4.62 MPa [m.sup.1/2]. It is higher than that of reactive plasma sprayed (RPS rps
revolutions per second ) TiN coating, which reflects the good toughness of a TiN-matrix `by reactive HVOF spraying.
Keywords Reactive high velocity oxygen fuel (HVOF) spraying, TiN-matrix coating, Vickers microhardness, Weibull distribution, Apparent fracture toughness, Polarization curve
In recent years, surface coatings (especially ceramics) have been widely used in industries and aeronautic aer·o·nau·tic also aer·o·nau·ti·cal
Of or relating to aeronautics.
aero·nau areas. (1-4) Due to no pollution and the excellent bonding strength property of in situ In place. When something is "in situ," it is in its original location. technology, the coatings deposited in situ have attracted the interest of researchers. (5), (6) Reactive thermal spraying is a good way to achieve coatings with good properties. (7) During spraying, hard ceramic phases (such as carbides, borides, and nitrides) are formed in situ by the reactions between the injected powders and the reactive gas.
Titanium nitride (TiN) coating has been extensively used as decorative coatings, wear-resistant coatings, diffusion barriers, and electrodes due to its superior wear resistance, erosion resistance, chemical inertness and thermal stability, heat resistance, low electrical resistance Electrical resistance
Opposition of a circuit to the flow of electric current. Ohm's law states that the current I flowing in a circuit is proportional to the applied potential difference V. , and attractive golden color. (8) At present, TiN coatings are mainly obtained by physical vapor deposition This article or section is in need of attention from an expert on the subject.
Please help recruit one or [ improve this article] yourself. See the talk page for details. (PVD PVD
peripheral vascular disease
PVD Peripheral vascular disease, see there ) (9) or chemical vapor deposition Vapor deposition
Production of a film of material often on a heated surface and in a vacuum. Vapor deposition technology is used in a large variety of applications. (CVD CVD Cardiovascular disease, see there ). (10) However, their applications are restricted due to the low deposited efficiency and coatings that are always less than 10 [micro]m thick.
To obtain thicker coatings, a reactive plasma spraying (RPS) technique has been applied through reactions between titanium powders and nitrogen plasma jets. (11-15) Bacci et al. (11) prepared a TiN coating with a thickness of 60 [micro]m using RPS under the aid of a pure nitrogen atmosphere chamber at 500 bars. Kobayashi (12) used a gas tunnel-type plasma jet to prepare a TiN coating whose thickness was more than 200 [micro]m. Feng et al. (13) prepared a TiN coating that was 500 [micro]m thick using RPS in an environment containing nitrogen. In addition, Xiao obtained nanostructured TiN coatings that were more than 300 [micro]m thick by means of RPS in air. (16)
However, HVOF-sprayed coatings have superior adhesive strength and higher density compared to DC and RF plasma counterparts. (7) Furthermore, the TiN coating prepared by reactive HVOF spraying has not ever been reported before. To obtain good properties of a TiN coating, the research in this paper was completed. TiN-matrix coating was successfully achieved with reactive HVOF spraying, and the properties of the coating were discussed.
Preparation of sample and the coating
Medium carbon steel (0.42-0.50 wt% C steel) with 40 mm diameter and thickness of 3 mm was used as the substrate material. Commercial Ti powders with particle size Particle size, also called grain size, refers to the diameter of individual grains of sediment, or the lithified particles in clastic rocks. The term may also be applied to other granular materials. from 45 to 70 [micro]m (Jin Jiang Metallic Powder Co. Ltd. of Shanghai, P.R. China) were used as starting material. Nitrogen was selected as carrier gas. After finally polished with 400 mesh abrasive paper, the substrates were grit-blasted with alumina to get the fresh surface, ultrasonically cleaned in anhydrous an·hy·drous
Without water, especially water of crystallization.
adj without water.
containing no water. ethanol, and then dried in cold air prior to the coating deposition. During the course of spraying, the Ti powders and the nitrogen reacted as follows:
2Ti + [N.sub.2] [right arrow] 2TiN (1)
A 300 [micro]m top coating of TiN-matrix coating was deposited without bond coat by a JP5000 HVOF spraying instrument. The spraying parameters are given in Table 1.
Table 1: HVOF spraying parameters Spraying parameters Value Kerosene 0.31 L/min Flow rate ([O.sub.2]) 822 L/min Flow rate (N.sub.2) 9.87 L/min Power feed rate 70 g/min Spraying distance 380 mm
The structure of an organism or object as revealed through microscopic examination.
a structure on a microscopic scale, such as that of a metal or a cell observation and property tests
The surface of the specimen was finely polished to avoid the effect of surface roughness before the X-ray diffractometer A Diffractometer (Main Entry: dif·frac·tom·e·ter Pronunciation: di-"frak-'tä-m&-t&r Function: noun) is a measuring instrument for analyzing the structure of a usually crystalline substance from the scattering pattern produced when a beam of radiation or particles (as X rays or (XRD) measurement. The phase composition of the coating was analyzed by XRD (Bruker D8 Advance XRD) with Cu K[alpha] 1.5406 [Angstrom angstrom (ăng`strəm), abbr. Å, unit of length equal to 10−10 meter (0.0000000001 meter); it is used to measure the wavelengths of visible light and of other forms of electromagnetic radiation, such as ultraviolet ], and radiation at 40 kV and 20 mA. An energy dispersive dispersive /dis·per·sive/ (-per´siv)
1. tending to become dispersed.
2. promoting dispersion. M-ray spectroscope spectroscope, optical instrument for producing spectral lines and measuring their wavelengths and intensities, used in spectral analysis (see spectrum). When a material is heated to incandescence it emits light that is characteristic of the atomic makeup of the (EDS, EDAX EDAX Energy Dispersive Spectroscopy , USA) was used to investigate the chemical composition of the coating. The cross section morphologies of the coating were studied with a scanning electron microscopy electron microscopy
Technique that allows examination of samples too small to be seen with a light microscope. Electron beams have much smaller wavelengths than visible light and hence higher resolving power. (SEM, JSM-6460, Japan). The microhardness of the TiN-matrix coating was measured by a Vickers tester (HX-1000, Shanghai, China) with load range from 0.05 to 1 kg and a dwell time The time cargo remains in a terminal's in-transit storage area while awaiting shipment by clearance transportation. See also storage. of 40 s. The microhardness values were the average value of 10 measurement points in the middle of a cross section at each load. The cross section of the coating was polished before indentation, and the distance between two indentations was at least three times the diagonal to prevent stress field effects from nearby indentations. Weibull distribution, which is fit for the broad and dispersive distribution of microhardness for brittle ceramic material, was used to analyze microhardness values of TiN-matrix coating. The Weibull distribution of two parameters is given as follows (17):
F(x) = 1-exp [-([x/[eta]).sup.m]] (2)
where F(x) in equation (2) is the cumulative density probability function Probability function
A measure that assigns a likelihood of occurrence to each and every possible outcome. , x is the selected microhardness value, [eta] is characteristic value, and m is the Weibull modulus The introduction to this article provides insufficient context for those unfamiliar with the subject matter.
Please help [ improve the introduction] to meet Wikipedia's layout standards. You can discuss the issue on the talk page. that reflects the dispersity of data in the distribution. The scale parameter In probability theory and statistics, a scale parameter is a special kind of numerical parameter of a parametric family of probability distributions. Definition
If a family of probability densities with parameter s is of the form
ln [-ln (1-F(x))] = m[ln (x)-ln (eta)] (3)
Therefore, a plot for ln [-ln (1-F(x))] versus In (x) will be a linear relation if the Weibull modulus is suitable. The function of F(x) = i/(n + 1) is supposed if the data is arranged in ascending order, where n is the total number of data points and i is the corresponding ordinal number The number that identifies the sequence of an item, for example, record #34. Contrast with cardinal number. . (17-20)
Calculation of apparent fracture toughness
The fracture toughness values of the TiN-Matrix coating at different loads were calculated based on equations (4) (13) and (5) (21).
[H.sub.v] = 0.463P/[a.sup.2] (4)
[K.sub.IC] = 0.016 [(E/H).sup.1/2] P/[C.sup.3/2] (5)
where a in equation (4) is half the length of the indentation diagonal, P is the applied load, E stands for Young's modulus Young's modulus [for Thomas Young], number representing (in pounds per square inch or dynes per square centimeter) the ratio of stress to strain for a wire or bar of a given substance. , and c is the length of the radial crack measured from the center of indentation. The morphologies of indentations were investigated by SEM.
Electrochemical electrochemical /elec·tro·chem·i·cal/ (-kem´i-k'l) pertaining to interaction or interconversion of chemical and electrical energies.
The potentiostatic polarization curves of the TiN-matrix coaling prepared by reactive HVOF spraying compared with AISI 316L stainless steel and bare carbon steel, which were studied using the CHI600C model instrument. A working electrode with an area of 1.0 [cm.sup.2] was used in the electrochemical test. The nonworking surface was covered with epoxide epoxide /epox·ide/ (e-pok´sid) an organic compound containing a reactive group resulting from the union of an oxygen atom with two other atoms, usually carbon, that are themselves joined together. resin. A platinum pole and an Ag/AgCl electrode were used as counter and reference electrodes, respectively. Due to the good anticorrosion properties of TiN-matrix coatings, they have a potential application in seawater seawater
Water that makes up the oceans and seas. Seawater is a complex mixture of 96.5% water, 2.5% salts, and small amounts of other substances. Much of the world's magnesium is recovered from seawater, as are large quantities of bromine. . To imitate the seawater environment, near-neutral 3.5 wt% NaCl solution (which is cheap and easily obtainable) was used as an electrolyte. It was static, naturally aerated aer·ate
tr.v. aer·at·ed, aer·at·ing, aer·ates
1. To supply with air or expose to the circulation of air: aerate soil.
2. , and at room temperature (20 [+or-] 5[degrees]C). (22), (23) Potentiostatic polarization tests were carried out from the initial potential of-1 V up to final potential of 3 V. Equipment with a scan rate The number of times per second an image capture or display device samples its field of vision. See scan line and horizontal scan frequency. See also scan technology. of 0.05 V/s, a sample interval of 0.001 V, quiet time of 2 s, and sensitivity of 0.1 A/V (1) (Audio/Video) Refers to equipment and applications that deal with sound and sight. The A/V world includes microphones, tape recorders, audio mixers, still and video cameras, film projectors, slide projectors, VCRs, CD and DVD players/recorders, amplifiers and was used in the experiment.
Results and discussion
Phase composition and structure
The phase composition of XRD analysis for the coating is shown in Fig. 1. From the XRD results, it is shown that the top coating is composed of TiN, Ti[N.sub.0.3], [Ti.sub.2][O.sub.3] and Ti[O.sub.2]. Five sharp TiN peaks appear in the spectrum, which suggests that the coating is mainly composed of a TiN phase. The contents of Ti[N.sub.0.3] and [Ti.sub.2][O.sub.3] are moderate, while the intensity of Ti[O.sub.2] is very low. That's the reason for naming the coating a TiN-matrix coating. Figure 2 displays morphologies of the cross section of TiN-matrix coating. The coating has a typical layer structure, with no distinct interfaces in the top coating and well bonding with the substrate, even without a bond coat. The thickness of the coating is about 350 [micro]m and the porosity of the coating is very low. From the consequences of the EDS analysis shown in Fig. 3 and Table 2, the bright phase (marked by Arrow 1) is clearly composed of Ti and N elements, while the dark phase (marked by Arrow 2) is composed of Ti, N, and O elements. With the XRD spectrum, it is clear that the bright phase consisted of titanium nitrides (TiN and Ti[N.sub.0.3]) and the other consisted of the mixture phase of titanium nitrides (TiN and Ti[N.sub.0.3])d titanium oxides ([Ti.sub.2][O.sub.3] and Ti[O.sub.2]).
[FIGURE 1 OMITTED]
[FIGURE 2 OMITTED]
[FIGURE 3 OMITTED]
Table 2: EDS analysis of a TiN-matrix coating Element 1 Spectrum 1 (at.%) Spectrum 2 (at.%) NK 11.52 10.70 OK - 13.56 TiK 88.48 75.74
A higher velocity of combustion gases (more than 4-5 times the velocity of sound) from HVOF jets, rather than plasma spraying, can lead to the powder particles obtaining a very high kinetic and heat energy due to the heat transfer of the powders during spraying. Therefore, the melted particles can deform adequately and the TiN-matrix coating becomes denser, as well as less porous using HVOF spraying. Moreover, the efficiency of HVOF is high and more than 300 [micro]m in thickness can be achieved in a few minutes. Compared with the TiN coating prepared using RPS, (13) [[Ti.sub.2][O.sub.3]and Ti[O.sub.2] phases were formed due to the oxygen used for combustion and coatings being deposited in the atmosphere during spraying.
Vickers microhardness and indentation
Table 3 shows the mean, minimum, maximum, and standard error of Vickers microhardness for the cross section of TiN-matrix coatings. Furthermore, the relationship between microhardness and applied load is displayed in Fig. 4. It's very clear that the average Vickers microhardness increases from 825HV to 1137HV with the applied load decreasing from 1 to 0.05 kg. The Vickers microhardness is much higher than the TiN coatings prepared by RPS at the same applied load in former research (13), (24) due to the high kinetic energy kinetic energy: see energy.
Form of energy that an object has by reason of its motion. The kind of motion may be translation (motion along a path from one place to another), rotation about an axis, vibration, or any combination of of the powders, adequate deformation, and more dense coatings supplied by HVOF spraying.
[FIGURE 4 OMITTED]
Table 3: Vickers microhardness of the coating Load (kg) Mean Min. Max. SE 1 825 730 970 23 0.5 947 870 1075 20 0.3 969 690 1410 59 0.2 1122 914 1584 67 0.1 1124 625 1533 82 0.05 1137 927 1486 54
Just as other researchers have already discovered, (25) the Vickers microhardness of TiN-matrix coatings also Table 2: EDS analysis of a TIN-matrix coatings also has indentation size effect (ISE), which is the measured microhardness decreasing with the increase of applied load. The possible reason for ISE is that the hardness equals the energy consumption for plastic deformation plastic deformation,
n any irreversible deformation of tissues. of unit volume. Because the surface area of solid materials will inevitably change during the course of indenting in·dent 1
v. in·dent·ed, in·dent·ing, in·dents
1. To set (the first line of a paragraph, for example) in from the margin.
a. , the energy consumption of indentation is partially consumed for volume plastic deformation, and other energy consumption will transfer the indenting that remains on the cross section of the TiN-matrix coating. When the applied load increases gradually, the crack formation (which can release the high stress to reduce the energy) increases, and the energy provided by indentation consumes more and more. Accordingly, the recovery of indentation surface area decreases, so the phenomenon of ISE is manifested from the hardness value. (26)
From the diagram of the relationship between Vickers microhardness and applied load (shown in Fig. 4), it is clear that the slope between the applied load of 0.2 kg and 0.3 kg changes sharply because of an obvious variety of phase shapes in TiN-matrix coatings. This phenomenon can be explained by elastic recovery and the formation of microcracks. The phase in the coating will be crushed because of the adequate applied load. Moreover, the crushed phase will show as microcracks. When the applied load lowers (less than 0.3 kg), there is no formation of microcracks along the diagonal of indentation for inadequate pressure. For example, a little arc present in the brim of indentation (shown in Fig. 5) indicates good elastic recovery with an applied load of 0.05 kg. When the applied load is off, high stress around the indentation is changeable. More obvious ISE appears with low applied loads. Contrarily, the microcrack appearing along the diagonal or brim of indentation can release the high stress to reduce energy, as shown in Fig. 6. Less obvious ISE is shown due to the weakening of elastic recovery on surface area.
[FIGURE 5 OMITTED]
[FIGURE 6 OMITTED]
Weibull distribution of Vickers microhardness
The Weibull plot of the Vickers microhardness for the TiN-matrix coating on the cross section at different loads and linear fittings is shown in Fig. 7. The detail information supplied by the figures is summarized in Table 4. It is remarkable that all the Weibull modulus values are suitable for showing a satisfactory distribution. However, the Weibull modulus increases with the increment of applied load. The low modulus corresponds to a high variability in the microhardness measurement. Accordingly, the microhardness values are more concentrated with a high modulus. The hard phases may be responsible for this phenomenon. With a light load, the indentation size is short and randomness is enhanced. The values of microhardness will be much different when a light load acts on the hard phase and soft phase. Contrarily, any phase may be crushed with a heavy load so that the indentation sizes are more uniform. Therefore, the measured microhardness values show lower variability with a heavy load.
[FIGURE 7 OMITTED]
Table 4: Summary of the results obtained from the Weibull distribution plot Applied Weibull Error Hardness In (HV) load (Kg) modulus, m range in HV 0.1 3.85 0.31 625-1533 6.44-7.33 0.3 4.91 0.89 690-1410 6.54-7.25 0.5 8.48 1.00 870-1075 6.77-6.98
Apparent fracture toughness
Fracture toughness is a key factor in estimating the resistance to crack generation and propagation. The damage of material due to mechanical action, thermal cycling, thermal shock and stress corrosion (27) can also be reflected by fracture toughness. The cross-sectional view of indentations at applied loads of 0.3 kg and 0.5 kg are exhibited at a magnification of x2000 in Figs. 6 and 8, respectively. Both of the cracks propagate along the extension of the diagonal. The parameters needed to calculate the apparent fracture toughness of the coating are listed in Table 5. To omit the titanium oxides in the coating, Young's modulus of TiN-matrix coatings is considered to be that of TiN coating--that is, 590 GPa. The average of apparent fracture toughness of the TiN-matrix coating at 0.3 and 0.5 kg load reaches 4.62 MPa. [m.sup.1/2], which is higher than the apparent fracture toughness prepared by RPS.(13)
[FIGURE 8 OMITTED]
Table 5: The parameters for calculating [K.sub.IC] Load a HV c [K.sub.IC] (kg) ([mu]m) (GPa) ([mu]m) (MPa. [m.sub.1/2]) 0.3 11.65 10.25 19.44 4.25 [+ or -] [+ or -] 0.18 0.52 0.5 16.22 8.81 25.82 4.99 [+ or -] [+ or -] 0.17 0.58
The superior properties of the reactive HVOF TiN-matrix coating should be owed to the unique structure and the toughening phenomenon. First of all, the structure of TiN-matrix coating is produced in situ by reactive HVOF spraying. The coating without pollution was deposited in situ and bonded layer by layer very well. High density and small pores hinder the formation and propagation of microcracks. Secondly, the oxides in the coating improve the fracture toughness. Although the existence of oxides in TiN-matrix coatings decreased the microhardness of the coating to some extent because of their reduced hardness, their interstratified structure in the main TiN phase is an important factor in slowing down the velocity of crack initiation. Last, but not least, the characteristic of HVOF spraying with a high velocity of combustion gases makes an important contribution to the denser coatings.
However, the calculated [K.sub.IC] value of the coating is an approximation. The accuracy of this method is not high due to multiple cracking, some pre-existent flaws, the residual stress in TiN-matrix coatings, and some error in measuring the length of crack using the SEM image. Moreover, the 0.016 coefficient determined by the shape of the indenter in equation (5) is an empirical value provided by Anstis et al. (21) The discrete coefficient of 0.016 is about 25%, making a relative error of approximately 30% of the [K.sub.IC] value. (26) On the other hand, the effects of the [K.sub.IC] value of [TiN.sub.0.3], [Ti.sub.2] [O.sub.3], and [TiO.sub.2] phases were neglected for the simple calculation of [K.sub.IC] value in TiN-matrix coatings. But it still can reflect the capability of the TiN-matrix coating in resisting crack generation and propagation, corrosion resistance, stress corrosion resistance, and so on.
The anodic an·ode
1. A positively charged electrode, as of an electrolytic cell, storage battery, or electron tube.
2. The negatively charged terminal of a primary cell or of a storage battery that is supplying current. and cathodic polarization curves corresponding to bare carbon steel, AISI 316L stainless steel, and HVOF-sprayed TiN-matrix coating samples are shown in Fig. 9. Curve AR, KL, and JF in the graph are cathodic polarization curves of bare carbon steel, AISI 316L stainless steel, and HVOF-sprayed TiN-matrix coating, respectively. Contrarily, curve AB, LM, and FG belong to anodic polarization curves. The current increases with the increment of potential in both these regions. This result indicates that these regions arc active regions that correspond to the solution of surface material.
[FIGURE 9 OMITTED]
It is very obvious that a typical passive region (curve GH) is found for the HVOF-sprayed TiN-matrix coating. A protective film for substrates is formed and the current decreases with the increment of potential in the passive region. With the continuous enhancement of potential, the protective film of the TiN-matrix coating is disruptive at point H. Reversely, there is no passive behavior happening for the bare carbon steel and AISI 316L stainless steel in 3.5 wt% NaCl solution--it just has a transition zone (curve BC) between the active and passive regions for carbon steel. Then, bare carbon steel continues to dissolve (curve CD) and the current increases gradually. A protective film (curve DE) is formed at a relative high potential compared with TiN-matrix coatings. Austenitic aus·ten·ite
A nonmagnetic solid solution of ferric carbide or carbon in iron, used in making corrosion-resistant steel.
[After Sir William Chandler Roberts-Austen (1843-1902), British metallurgist. stainless steels (in particular, AISI 316L steel) have been used in industrial applications due to their good corrosion resistance in different environments. (28) Compared with carbon steel, the corrosion potential of AISI 316K stainless steel increases and the corrosion current decreases. It shows that the corrosion resistance of 316L stainless steel is better than carbon steel. Similarly, the corrosion potential of the HVOF-sprayed TIN-matrix coating increases more sharply than AISI 316L stainless steel, and the corrosion current also decreases. It can be concluded that the coating can evidently improve the anticorrosion property of bare carbon steel. Dense coatings deposited by reactive HVOF spraying can hinder the corrosion of electrolytes very well.
The TiN-matrix coating of more than 300 [micro]m in thickness was deposited by successful reactive HVOF spraying in air. The typical layered structure of the coatings bonds well with each other. The coatings also bond with the substrate in a good condition even without a bond coat. Furthermore, the main characteristics of HVOF spraying were discussed above. The main conclusions are as follows:
(1) Higher average microhardness value were obtained using reactive HVOF spaying spaying: see castration. than RPS with the same applied load. The microhardness values increase from 825[HV.sub.1] to 1137[HV.sub.0.05] with obvious indentation size effect (ISE) in the coating. Satisfactory Weibull distribution is more concentrated with the increment of applied load.
(2) The reactive HVOF coating possesses high apparent fracture toughness about 4.62 MPa. [m.sup.1/2], which is relatively outstanding in ceramic coatings. The brim of the indentation has arc shape due to the good toughness. The excellent microhardness and apparent fracture toughness properties are determined by the characteristics of relative HVOF spraying.
(3) Thick coatings can remarkably improve the anticorrosion property of bare carbon steel. Compared with AISI 316L stainless steel, HVOF sprayed TiN-matrix coatings with a longer passive region and lower corrosion current possess an excellent anticorrosion property in 3.5 wt% NaCl electrolytic solution.
Acknowledgments The authors are grateful to Mr. W. Tang for the depositing of the coating and the XRD analysis by Mr. H. B Han in the instrumental analysis center of Shanghai Jiaotong University. This work was financially supported by the Opening Fund Program of China (No. KFJJ07-2). The authors are also thankful for the hard work of editors and reviewers on the paper.
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Z. Mao, J. Ma, J. Wang, B. Sun
State Key Laboratory of Metal Matrix Composites, Shanghai Jiaotong University, Shanghai 200240, People's Republic of China
State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology Beijing Institute of Technology (BIT,北京理工大学) is a university located in Beijing, People's Republic of China. History
Founded in 1940 as Yan'an Academy of Natural Science. . Beijing 100081, People's Republic of China
Material Institute, Hebei University of Science and Technology Hebei University of Science and Technology (河北科技大学) is one of the key, multi-disciplinary universities in Hebei province. It is composed of four campuses
, Shijiazhuang 050054, People's Republic of China
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