Slick mold coating offers better release. (Keeping up with Tooling).BryCoat Inc., Safety Harbor, Fla., offers a new low-friction metal-coating service that reportedly can improve mold filling and release properties. Tungsten disulfide di·sul·fide n. A chemical compound containing two sulfur atoms combined with other elements or radicals. Also called bisulfide. (WS2) is a dry-film lubricant that reportedly provides a lower coefficient of friction coefficient of friction n. pl. coefficients of friction The ratio of the force that maintains contact between an object and a surface and the frictional force that resists the motion of the object. than PTFE PTFE polytetrafluoroethylene. , molybdenum disulfide Molybdenum disulfide, also called molybdenum sulfide or molybdenum(IV) sulfide, with the formula MoS2, is a black crystalline sulfide of molybdenum and one of several compounds known as transition metal dichalcogenides. , or graphite under most conditions. WS2 has an operating temperature range up to 1200 F and bonds readily to the metal substrate. Its inherent non-stick nature not only enhances mold release, but also allows faster mold fill at lower pressures and temperatures, the company claims. WS2 is also said to provide synergistic benefits when combined with an ultra-hard coating such as titanium nitride (TiN) or chromium nitride (CrN). These "duplex" coatings have wear resistance greater than the sum of the components. |
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