Understanding Melting operations. (Melting Methods & Materials).
The 7 panels and presentations of the AFS A distributed file system for large, widely dispersed Unix and Windows networks from Transarc Corporation, now part of IBM. It is noted for its ease of administration and expandability and stems from Carnegie-Mellon's Andrew File System.
AFS - Andrew File System Melting Methods and Materials Div. provided information on a wide spectrum of melting operation issues.
In their paper, "Effect of Temperature on the Friability fri·a·ble
Readily crumbled; brittle: friable asbestos insulation.
[Latin fri of Silicon Carbide silicon carbide, chemical compound, SiC, that forms extremely hard, dark, iridescent crystals that are insoluble in water and other common solvents. Widely used as an abrasive, it is marketed under such familiar trade names as Carborundum and Crystolon. in the Cupola cupola /cu·po·la/ (koo´pah-lah) cupula.
A cup-shaped or domelike structure.
cupula. ," (03-038) A.D. Saikia, V.L Richards and K.D. Peaslee, Univ. of Missouri--Rolla, described the effects of the cupola environment on the integrity of silicon carbide briquettes, which are frequently used as charge material.
Samples of three industrial grades of silicon carbide briquettes were fired and ground in a jaw crusher to determine the influence of temperature and composition on friability. It was determined that the friability of the silicon carbide briquettes increased as the silicon carbide content decreased. Friability also increased for all three compositions with increasing firing temperature up to approximately 1832F (1000C), above which friability decreased with increasing temperature.
In his presentation, "Maintaining Crucibles for Steel Investment Foundries," (03-039) K.E. Keyzer, Engineered Ceramics, discussed common crucible failures and their causes in order to develop a list of best practices for steel investment foundries. According to according to
1. As stated or indicated by; on the authority of: according to historians.
2. In keeping with: according to instructions.
3. Keyzer, crucible performance is key to a steel investment foundry in order to maximize furnace up time while minimizing slag and inclusions.
Keyzer found that the best ways to prolong the life of a crucible include:
* always install crucible properly, using set procedure and proper tools;
* prevent thermal shock Thermal shock in mechanical models
Thermal shock is the name given to cracking as a result of rapid temperature change. Glass and ceramic objects are particularly vulnerable to this form of failure, due to their low toughness, low thermal conductivity, and high ;
* avoid mechanical stress;
* reduce corrosion and erosion.