Sintering behaviour of alumina-tungsten carbide composites

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:284

Article

Acchar, W ; Martinelli, AE ; Vieira, FA ; Cairo, CAA

关键词: Al2O3;    tungsten carbide;    fracture toughness;    cutting tools;   

DOI  :  10.1016/S0921-5093(00)00790-5

来源: Elsevier

【 摘 要 】

Alumina reinforced with tungsten carbide has been investigated as an alternative material for metalworking, combining resistance to high service temperatures and improved toughness. Pressureless sintered and hot-pressed Al2O3-WC composites were manufactured and characterised. The use of Y2O3 as a sintering additive has also been evaluated. Additions of up to 30 wt.% WC resulted in limited grain boundary pinning and corresponding high densification. Although the addition of Y2O3 improved sintering, the presence of a residual grain boundary phase (YAG) was harmful to the fracture toughness of the composites, as it affected the effectiveness of the crack deflection mechanism that takes place at the interfaces between Al2O3 and WC grains. Hot-pressing resulted in hardness similar to 17.5 GPa and fracture toughness similar to 7 MPa m(-1/2), which is an improvement compared to alumina reinforced by other refractory carbides. (C) 2000 Elsevier Science S.A. All rights reserved.

【 授权许可】

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