Cobalt Chromium Alloy original pure tungsten rocket lan […]
Cobalt Chromium Alloy original pure tungsten rocket lance nozzle can no longer meet such conditions of use, when other materials can not meet the requirements. In the early 1960s, R.E.Mott and G.G.Goetel and others re-studied the tungsten-silver alloy according to the concept of "sweat cooling", including the mechanism of perspiration, thermal shock resistance, system preparation process and performance research. The mid-1960s developed tungsten silver (W-10Ag) nozzle, equipped with "Polaris A-3" missiles. Although the tungsten silver nozzle nozzle earlier than the tungsten copper, but because of its high price and other nozzle material developed successfully, then no further development. Currently tungsten silver material is mainly used for electrical switch contacts (contacts), the contact resistance of tungsten copper material is smaller, more for contactors.
Silver and tungsten are insoluble in both liquid and solid state. Preparation of silver tungsten alloy can only be made by sintering powder metallurgy material, can also be used extrusion method. Material is characterized by high hardness, anti-arc erosion, anti-adhesion and anti-welding ability. Made by powder metallurgy. More than 60% of the tungsten alloy used in many production methods. At very high temperatures, such as above 3000 ° C, the copper in the alloy is liquefied and vaporized, absorbing large amounts of heat and reducing the surface temperature of the material. So this kind of material is also called metal sweat material. Since tungsten and copper are incompatible with each other, tungsten-copper alloys have low expansibility, wear resistance, corrosion resistance, and high electrical and thermal conductivity of copper, and are suitable for various machining processes.
Tungsten copper alloy according to user requirements for the ratio of tungsten and copper production and size of the processing. Tungsten copper alloy powder metallurgy process is generally the first powder - mixing ingredients - pressing molding - sintering infiltration. Tungsten copper is the use of high-purity tungsten powder excellent metal properties and high purity copper powder plasticity, high conductivity, etc., by hydrostatic molding, high temperature sintering, the infiltration of copper refining process of composite materials. Arc-breaking performance, conductive thermal conductivity, thermal expansion, high temperature does not soften, high strength, high density, high hardness.