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coarse grain tungsten powder at high temperature (950 ℃) was studied. The phase composition and morphologies of products were investigated by means of XRD and SEM. The results show that the reduction... powder layer shows strong effect on the nucleation and grain growth of tungsten. By increasing the pH2O/pH2 within powder layer, well-developed coarse grain tungsten powder with particle size above 15......
of the nanoscale tungsten powder starts to shrink at 1050℃and ends at 1500℃. The shrinkage rate reaches the maximum value at 1210℃8. The relative density of sintered samples is 96.4%, and its grain size is about...Fine grain tungsten produced with nanoscale powderTao Lin, Fang Zhao, Liying Zhang, Chengyi Wu, and Zhimeng Guo Materials Science and Engineering School, University of Science and Technology Beijing......
that of WO2→W in getting stable nanosized tungsten powder with less grain size.关键词:...="ChDivSummary"><正>Nanosized tungsten powder was synthesized by means of different methods and under different conditions with nanosized WO3 powder. The powder and the intermediate products were......
J. Cent. South Univ. (2020) 27: 334-343 DOI: https://doi.org/10.1007/s11771-020-4299-9 Microstructure and tensile property of SLM 316L stainless steel manufactured with fine and coarse powder... is relatively high, which significantly limits the development of the SLM. In this study, the 316L fine powder and coarse powder with a mass ratio of 80:20, 70:30 and 60:40 were mixed using a ball......
, as shown in Fig.8 and microstructure evolution from coarse structure into fine feathery one, as shown in Fig.9. Fig.6 XRD pattern of qualified spheroidal cast tungsten carbide powder Fig.7...Article ID: 1003-6326(2005)02-0270-05 Influence of fabricating process on microstructure and properties of spheroidal cast tungsten carbide powder DAI Yu(戴 煜)1, 2, TAN Xing-long(谭兴龙)1, LI Yu......
welding, such as hydrogen and oxygen. The coarse columned grains in the fusion zone are rapidly formed, which leads to the harmful elements concentrating on the grain boundaries, reduces the binding...Article ID: 1003-6326(2005)05-1081-04 Double-sided gas tungsten arc welding process on TC4 titanium alloy GAO Hong-ming(高洪明), BAI Yan(白 岩), YANG Tian-dong(杨天东) (State Key Laboratory......
. Key words: cemented carbide; platelet tungsten carbide grain; grain growth inhibition; yttrium; sintering ..., and inhomogeneous grain growth which is a very vexing problem in cemented carbide with ultrafine or nano tungsten carbide as starting material during the early-stage densification was suppressed by the addition......
INDUCTION PLASMA REACTIVE DEPOSITION OF TUNGSTENCARBIDE FROM TUNGSTEN METAL POWDER M.I.Boulos1,X.L.Jiang2 (1.Department of Chemical Engineering, University of Sherbrooke, Sherbrooke, J1K 2R1... the tungsten powder and methane in the induction plasma, and the secondary carburization of the deposit on substrate at high temperature. Optical microscopy and scanning electron microscopy were used to examine......
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