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자료유형
학술저널
저자정보
He Zhang (University of Science and Technology Beijing) Guo-Hua Zhang (University of Science and Technology Beijing)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.6
발행연도
2021.1
수록면
1,649 - 1,661 (13page)

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In this paper, a new method for preparing ultrafine tungsten-molybdenum composite powders has been proposed. The carbothermicpre-reduction of the mixture of molybdenum trioxide and tungsten trioxide with insufficient carbon black underargon atmosphere was carried out, to generate the pre-reduced tungsten-molybdenum composite powder containing a smallamount of residual dioxide. Thereafter, the obtained reaction product was subjected to hydrogen reduction to remove theresidual dioxide and generate pure tungsten-molybdenum composite powder with the particle size of 100–200 nm. Two kindsof ultrafine tungsten-molybdenum alloy powders (Mo-30 wt% W, Mo-70 wt% W) were prepared. The residual carbon of thefinally obtained product was about 0.01–0.02 wt% after the hydrogen reduction. The sintering behavior of ultrafine W–Mopowders and the properties of sintered samples are investigated. After sintering ultrafine Mo-30 wt% W and Mo-70 wt% Wpowders at 1600 °C, the relative density of the sintered compacts was about 99%, 97%, and the microhardness were 287 HVand 350 HV, respectively. Meanwhile, as increasing the sintering temperature from 1200 to 1600 °C, the relative densityand microhardness of the compacts gradually increased.

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