| 摘要 |
The process includes (a) mixing a titanium hydride powder having a particle size of <=150 mum with alloying metal powders (master alloys or elemental metal powders) having a particle size in the range of {fraction (1/15-2/5 of the maximal particle size of titanium hydride powder, (b) compacting the resulting powder mixture by molding at the pressures of 400-1000 MPa, (c) heating up to the sintering temperature of the predetermined alloy composition at variable pressures in a furnace chamber: initial heating to 400° C. in vacuum of less than 10<-2 >Pa, then, heating to a temperature range of 400-900° C. with the pressures up to 10<4 >Pa, which is controlled by hydrogen being emitted by the decomposition of titanium hydride contained in the compacted powdered alloy, and finally, heating to over 900° C. to the sintering temperature at the pressure continually decreasing to the starting vacuum level, and (d) sintering. Heating to the sintering temperature is performed at the rate of 10-15 grad/min. The new technology allows the purity and mechanical properties of sintered titanium alloys and the manufacture of near-net shape sintered titanium articles to be controlled by a cost-effective method.
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