| 摘要 |
PURPOSE: To improve fusion resistance and wear resistance by using the plastic workpiece of a sintered body having a structure in which fine lanthanum oxide with an average particle size less than 1μm is dispersed distributed on a silver (Ag) base in a ratio of a prescribed wt.%. CONSTITUTION: As a metal oxide particle, lanthanum oxide (La2 O3 ) particle is used, and when the La2 O3 particle is mixed with Ag powder, a ball mill or the like, and also a vibrating mill are used to perform a mechanical ironing. Even when the mixing ratio of La2 O3 powder is set to 5wt.% or more, thus, the La2 O3 powder is refined less than 1μm in average particle size by the mechanical ironing, and laid in the state where they are uniformly dispersed and distributed in the Ag powder. Even when it is sintered, no particle development is caused in the La2 O3 particle. When the plastic workpiece of a sintered body having a tissue in which fine La2 O3 with an average particle size less than 1μm is dispersed and distributed in an Ag base in a ratio of 7-20wt.% is used, fusion resistance and wear resistance (contact characteristic) can be improved.
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