Hard, tough and strong ZrO2-WC composites from nanosized powders

被引:69
作者
Anné, G [1 ]
Put, S [1 ]
Vanmeensel, K [1 ]
Jiang, DT [1 ]
Vleugels, J [1 ]
Van der Biest, O [1 ]
机构
[1] Katholieke Univ Leuven, Dept Met & Mat Engn, MTM, B-3001 Heverlee, Belgium
关键词
hot pressing; composites; mechanical properties; toughness; ZrO2-WC; WC;
D O I
10.1016/j.jeurceramsoc.2004.01.015
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Yttria-stabilised zirconia (Y-TZP) based composites with a tungsten carbide (WC) content up to 50 vol.% were prepared from nanopowders by means of conventional hot pressing. The mechanical properties were investigated as a function of the WC content. The hardness increased from 12.3 GPa for pure Y-TZP up to 16.4 GPa for the composite with 50 vol.% WC, whereas the bending strength reached a maximum of 1551 MPa for the 20 vol.% WC composite. The toughness of the composites could be optimised by judicious adjustment of the overall yttria content by mixing monoclinic and 3 mol% Y2O3 co-precipitated ZrO2 starting powders. An optimum fracture toughness of 9 MPa m(1/2) was obtained for a 40% WC composite with an overall yttria content of 2 mol%. The hardness, strength as well as fracture toughness of the ultrafine grained composites with a nanosized WC source was significantly higher than with micron-sized WC. The experimentally measured contribution of the different observed toughening mechanisms was evaluated as a function of the WC content. Transformation toughening was found to be the major toughening mechanism in ZrO2-WC composites with up to 30 vol.% WC, whereas the contribution of crack deflection and bridging is significant at a secondary phase content above 30 vol.%. (C) 2004 Elsevier Ltd. All rights reserved.
引用
收藏
页码:55 / 63
页数:9
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