ALLOY MATERIAL FOR STRUCTURAL MATERIAL OF VERY HIGH TEMPERATURE FURNACE AND METHOD FOR MANUFACTURING IT

摘要

PROBLEM TO BE SOLVED: To make it possible to withstand a severe condition by adding Y2O3, titanium and tungsten of a specific ratio respectively to a material of ferritic steel and then alloying and powdering it through a mechanical alloying treatment and conducting a sintering and molding treatment of it. ;SOLUTION: Y2O3 of 0.07 to 0.10%, Ti of 0.09 to 0.10% and W of 3 to 4.5% in the form of powder are added respectively to powdery ferritic steel and are mixed with it. A mechanical alloying treatment is conducted for the mixture to alloy and powder it. Then, the obtained powdery alloy is made to have a size of about 1 μm in particle diameter by a plasma electric discharge sintering method, an HIP method, or a hot extrusion method. Consequently, an alloy material can be obtained which is useful as a structural material for a nuclear fusion reactor that has excellent high-temperature strength properties making it possible to withstand a working condition at a high temperature under the irradiation with high-energy neutron flux, mechanical characteristics under high temperature conditions and low activation properties against neutron irradiation.;COPYRIGHT: (C)2000,JPO