| 摘要 |
PROBLEM TO BE SOLVED: To provide a tungsten material superior in structural stability and strength at high temperature, by dispersing metal and metal oxide with the use of an alternative substance to ThO2 , while taking difficulty of a technical method and an effect on a production cost into account, and to provide a manufacturing method therefor. SOLUTION: The closely packed W-sintered compact includes lanthanum oxide (La2O3) of 5.0-10.0 mass%, rhenium(Re) of 3-20 mass%, and the balance tungsten (W) with unavoidable impurities, and is made with the use of hot isostatic pressing(HIP). The sintered compact is comprised of very fine crystal grains, and has such stability as not to cause coarsening of the crystal grains even by severe heating, due to an effect of La2O3 and Re. Materials such as plates and linear rods manufactured in a predetermined process from the sintered compact as a raw material, have tensile strength of higher than 450 MPa even when heated to 1,000 deg.C or higher, and tensile strength of higher than 230 MPa even when heated to the range of 1,500 deg.C to 1,700 deg.C.
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