| 摘要 |
<p>PURPOSE:To obtain a material, thermal expansion property, thermal conduction and the density of an alloy thereof are improved, by impregnating a sintered porous body, which is acquired by pressing and molding W powder or Mo powder or W-Mo alloy powder of specific grain size and sintering it in a nonoxidizing atmosphere at a specific temperature, with Cu at a specific weight ratio. CONSTITUTION:A sintered porous body, which is obtained by pressing and molding W powder, Mo powder or W-Mo alloy powder of 1-40mum mean grain size and sintering it in a nonoxidizing atmosphere at 1,300-1,600 deg.C, is impregnated with Cu at a 5-25% weight ratio. When fine powder of 1mum or less are used as raw-material powder, independent holes are easy to be generated partially on a sintering, Cu is not impregnated, and thermal conductivity lowers. When coarse grains of 40mum or more are used, grains are roughened by the growth of grains on a baking, and variance in an alloy of thermal conductivity is enlarged. A remarkable effect is not displayed both in thermal expansion and thermal conduction when the content of Cu falls bellow 5%, and a thermal expansion coefficient increases and the material is undesirable when the content exceeds 25%.</p> |
