Tungsten Copper Infiltration Method

The method of  tungsten copper infiltration is that tungsten powder is pressed into briquettes , calcined at a temperature to prepare a porous tungsten skeleton with a certain density and strength , and lower melting point of copper to melt infiltrated tungsten skeleton , whereby the denser methods tungsten copper materials. When the mechanism is a porous metal substrate wetting liquid , the liquid metal filling the pores of the porous tungsten skeleton capillary force in the gap along the particle flow ,

so as to obtain a denser material. This method can improve the toughness of tungsten copper materials. Infiltration prepared using high- density tungsten-copper composite material , its good thermal and electrical conductivity , but difficult to achieve tungsten skeleton and pore connectivity all the same size , and the infiltration of the product after it is difficult to ensure the distribution of copper uniformity , which is bound to affect the material properties. With powder plasticized near net shape technology development and modern science and technology to improve the shape of the complexity of the components required for the preparation of tungsten skeleton from a single conventional powder metallurgy molded and injection molding to extrusion direction. If the United States RM German , who used injection molding technology to prepare tungsten skeleton , get good results , they will be pre-prepared tungsten skeleton of calcined at 900 ℃ , at 1500 ℃ infiltration 9O ~ 120min, superior alloys obtained . Due to the excellent performance of the method for preparing tungsten-copper composite material , therefore the most widely used . However , this method is also a great lack of specific performance after infiltrating need to be machined to remove excess copper , increasing the cost of the machining sequence , reducing the yield , but also not conducive to the complex shape parts adopted .

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