| 摘要 |
PROBLEM TO BE SOLVED: To obtain a material having a ductile-brittle transition temp. of <=a specified temp. without executing plastic working by granulating high m.p. metal powder by using a binder and compacting and sintering this granulated powder. SOLUTION: This low temp. ductile material is composed of a high m.p. metal sintered body and has a ductile-brittle transition temp. of <=100 deg.C. The granulation is executed in such a manner that into the high m.p. metal powder, preferably with 1 to 5μm particle size of molybdenum, tungsten, tantalum, rhenium or the like a binder such as polyvinyl alcohol, polyethylene glycol or the like is added. The average particle size of the granulated powder is preferably regulated to 20 to 100μm. Next, th granulated powder is compacted to have the prescribed size and shape. The comporting pressure is preferably regulated to about 1 to 4 kg/cm<2> . The obtd. compacted body is degreased and is moreover sintered. Preferably, the degreasing is executed at 600 to 900 deg.C for 2 to 5 hr, and the sintering is executed at 1700 to 1900 deg.C for 5 to 10 hr.
|
