Formation mechanisms of microstructure imperfections and their effects on strength in submicron cemented carbide

被引：16

作者：

Wu Chong-hu ^{[1
]}

Zhang Tai-quan

机构：

[1] Xiamen Tungsten Co Ltd, Ctr Technol, China Natl R&D Ctr Tungsten Technol, Xiamen 361009, Peoples R China

来源：

INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS | 2013年 / 40卷

关键词：

WC-Co cemented carbides; Fracture origin; Microstructure imperfections; Strength; SIZE; CERAMICS;

D O I：

10.1016/j.ijrmhm.2013.02.016

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The characteristics and formation mechanisms of microstructure imperfections in two sets of submicron WC-10wt.%Co cemented carbides, which are fabricated by vacuum and low-pressure sintering, respectively, are deeply analyzed. Main imperfections are pore-Co-pool in the vacuum-sintered samples. The number of pore-Co-pool is obviously reduced by low-pressure sintering, but many porous microstructures with poor-Co or Co-free are easily introduced; the impurity segregation is also easily formed. Transverse rupture strength (TRS) of samples is strongly affected by the characteristics and size of imperfections. Two linear relationships between TRS and pore size are experimentally established, and a critical pore size has been calculated to be 28.8 mu m. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：8 / 13

页数：6

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