Abstract:
W powders with rare earth oxide La
2O
3 were prepared by liquid-solid blending method, which includes mixing La(NO
3)
3 and WO
3, drying, decomposition of La(NO
3)
3 and reduction of WO
3. CuW electrical contact materials with La
2O
3 were fabricated by powder metallurgy-infiltration technology. The effect of holding time on the revivification of La(NO
3)
3 and that of La
2O
3 addition on the properties of CuW electric contact materials were investigated. The results show that La
2O
3 distributes uniformly in fine tungsten compound powders, and the particle size of powders decomposed by La(NO
3)
3 increases with prolonging holding time. The electrical breakdown strength of CuW electrical contact materials doped with La
2O
3 increases significantly.
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