TEM study of a hot-pressed Al2O3-NbC composite material

Materials Research

Wilson Acchar²  Carlos Alberto Cairo¹  Ana Maria Segadães¹ 

[1] ,Federal University of Rio Grande do Norte Department of Physics Natal RN ,Brazil

关键词: alumina;    niobium carbide;    mechanical properties;    microstructure;   

DOI  :  10.1590/S1516-14392005000100019

来源: SciELO

【 摘 要 】

Alumina-based composites have been developed in order to improve the mechanical properties of the monolithic matrix and to replace the WC-Co material for cutting tool applications. Al2O3 reinforced with refractory carbides improves hardness, fracture toughness and wear resistance to values suitable for metalworking applications. Al2O3-NbC composites were uniaxially hot-pressed at 1650 °C in an inert atmosphere and their mechanical properties and microstructures were analyzed. Sintered density, average grain size, microhardness and fracture toughness measurements and microstructural features were evaluated. Results have shown that the mechanical properties of alumina-NbC are comparable to other carbide systems. Microstructural analysis has shown that the niobium carbide particles are mainly located at the grain boundaries of alumina grains, which is an evidence of the "pinning effect", produced by NbC particles.

【 授权许可】

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