De cobre tungstênio informa??o de fundo

Onde aplicável tungstênio de cobre
Cu-W ligas s?o utilizadas quando s?o necessárias a combina??o de elevada resistência ao calor, elevada condutividade eléctrica e / ou térmica e baixa expans?o térmica. Algumas das aplica??es s?o em solda por resistência elétrica, contatos elétricos e, como dissipadores de calor. Como material em contacto com a liga é resistente à eros?o por arco eléctrico. W-Cu ligas também s?o usados ??em eletrodos para usinagem de descarga elétrica e usinagem eletroquímica.

A liga CuW75, com 75% de tungstênio, é amplamente utilizado em portadores de chips, substratos, flanges e quadros de dispositivos semicondutores de potência. A elevada condutividade térmica do cobre, juntamente com a baixa dilata??o térmica, de tungsténio permite a expans?o térmica correspondente ao silício, arsenieto de gálio e, em algumas ceramicas. Outros materiais para estas aplica??es s?o CuMo liga, AlSiC e Dymalloy.

Alloy with 70-90% of tungsten is used in liners of some specialty shaped charges. The penetration is enhanced by factor 1.3 against copper for homogeneous steel target, as both the density and the break-up time are increased. Tungsten powder based shaped charge liners are especially suitable for oil well completion. Other ductile metals can be used as binder in place of copper as well. Graphite can be added as lubricant to the powder.

For different application should choice the different grade tungstênio de cobre composition. The key factor is evaluating the hardness, electrical conductivity. Thread tapping is better use the Cu-W (72% by weight) tungsten composition. for some EDM electrode since it need to be machining after periods of using. The W-70% to 75% compositions is recommended.

The manufacturing process of tungstênio de cobre alloy is to press the refractory (tungsten or tungsten carbide), sinter the pressed compact at a high temperature, and infiltrate with copper. All of this is done under very closely controlled conditions. The mechanical and physical properties of Tungsten copper alloy vary with composition. The thermal and electrical conductivity increased with the amount of copper, while the hardness, strength, and resistance to mechanical wear increase with the amount of tungsten or tungsten carbide. The application determines the material choice.