期刊
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
卷 27, 期 4, 页码 701-704出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrmhm.2008.11.004
关键词
Plasma; Mechanical milling; Powder processing; Sintering
The sintering behavior of nanosized tungsten powder (25 nm average size) synthesized by a thermal plasma process, in which ammonium paratungstate (APT) was reduced by hydrogen was investigated, compared with submicron W powder (0.5 mu m average size) and nanosized W powder (23 nm average size) produced from the latter by high energy milling. The hardness of the compact of the plasma-synthesized powder (315 VHN) sintered at 1400 degrees C was higher than that of submicron-sized powder (193 VHN) and was similar to that of the milled powder (309 VHN). The plasma-synthesized powder, however, yielded a compact with much lower tendency to form cracks than the milled powder. (C) 2008 Elsevier Ltd. All rights reserved.
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