Improvements in mechanical properties of TiB2 ceramics tool materials by the dispersion of Al2O3 particles

被引：62

作者：

Gu, Meilin ^{[1
,2
]}

Huang, Chuanzhen ^{[2
]}

Xiao, Shourong ^{[2
]}

Liu, Hanlian ^{[2
]}

机构：

[1] Hebei Univ Technol, Sch Mech Engn, Tianjin 300130, Peoples R China

[2] Shandong Univ, Sch Mech Engn, Ctr Adv Jet Engn Technol, Jinan 250061, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2008年 / 486卷 / 1-2期

关键词：

TiB2; Al2O3; cutting tools; microstructure; mechanical properties;

D O I：

10.1016/j.msea.2007.09.040

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

TiB2-Al2O3 composites with Ni-Mo as sintering aid have been fabricated by a hot-press technique at a lower temperature of 1530 degrees C for 1 h, and the mechanical properties and microstructure were investigated. The microstructure consists of dispersed Al2O3 particles in a fine-grained TiB2 matrix. The addition of Al2O3 increases the fracture toughness up to 6.02 MPa m(1/2) at an amount of 40 vol.% Al2O3 and the flexural strength up to 913.86 MPa at an amount of 10 vol.% Al2O3. The improved flexural strength of the composites is a result of higher density than that of monolithic TiB2. The increase of fracture toughness is a result of crack bridging by the metal grains on the boundaries, and crack deflection by weak grain boundaries due to the bad wetting characters between Ni-Mo and Al2O3. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：167 / 170

页数：4

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