Sparking plasma sintering of tungsten carbide nanopowders

被引：9

作者：

Chuvil’deev V.N. ^{[1
]}

Blagoveshchenskiy Y.V. ^{[2
]}

Nokhrin A.V. ^{[1
]}

Sakharov N.V. ^{[1
]}

Boldin M.S. ^{[1
]}

Isaeva N.V. ^{[2
]}

Shotin S.V. ^{[1
]}

Lopatin Y.G. ^{[1
]}

Smirnova E.S. ^{[1
]}

Popov A.A. ^{[1
]}

Belkin O.A. ^{[1
]}

Semenycheva A.V. ^{[1
]}

机构：

[1] Lobachevsky State University of Nizhni Novgorod, Physical-Technical Research Institute, pr. Gagarina 23/3, Nizhni Novgorod

[2] Baikov Institute of Metallurgy and Material Science, Russian Academy of Sciences, Leninskii pr. 49, Moscow

来源：

Nanotechnologies in Russia | 2015年 / 10卷 / 5-6期

关键词：

Compendex;

D O I：

10.1134/S1995078015030040

中图分类号：

学科分类号：

摘要：

Spark Plasma Sintering studies of the high-speed consolidation of pure tungsten carbide WC nanopowders have been carried out. The influence of the initial size of the WC nanoparticles and modes of their receiption the density, structural parameters, and mechanical properties of tungsten carbide are studied. Samples of high-density nanostructured tungsten carbide with high hardness (up to 31–34 GPa) and an increased crack resistance (4.3–5.2 MPa m1/2) are obtained. It is found that the effect of accelerating tungsten carbide nanopowder sintering under conditions of high-speed heating is associated with the acceleration of diffusion along grain boundaries in the sintered material. It is shown that the nonmonotonic dependence of the optimal sintering temperature on the initial grain size is caused by a change in grain-boundary diffusion coefficient in conditions of abnormal grain growth. It is found that the size of abnormally large grains in spark plasma sintering depends on the volume fraction of particles of the nonstoichiometric phase. © 2015, Pleiades Publishing, Ltd.

引用

页码：434 / 448

页数：14

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