Compared with extrusion molding, Injection molding has been widely used, it makes porous tungsten blank by injection molding. The researchers adopt injection molding to make tungsten skeleton and observe 10%, 15%, 20% tungsten blank. Tungsten skeleton pre-sintering at 900℃, infiltrating 90-120min at 1500℃ can get tungsten copper composite material with 99.2% density, 1500MPa breaking strength.
The sintering process of porous tungsten skeleton plays an important role in tungsten copper electrode infiltration, including sintering temperature, holding temperature, sintering atmosphere, gas aggregate and so on. Sintering temperature choose by tungsten powder granularity, distribution of granularity, suppression density and other factors.
The experiment result shows that 5-9μm (tungsten powder granularity), 1000℃ (pre-sintering temperature), 1350℃ (infiltration temperature) is the ideal condition for tungsten copper electrode. In another experiment, researchers study tungsten copper contact of high-voltage switch sintering in the N2 atmosphere, which find that there is non-oxidation, non carbonization in joint surface and tungsten powder grains distribute uniformly with Cu covered.
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