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Processing and characterization of an Al2O3/WC/TiC micro- nano-composite ceramic tool material by Jun Zhao; Xunliang Yuan; Yonghui Zhou is a Engineering article available to read on EtoBox.

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An Al 2 O 3 -based composite ceramic tool material reinforced with WC microparticles and TiC nanoparticles was fabricated by using hot-pressing technique with MgO and NiO as sintering aids. The experimental results showed that optimal mechanical properties were achieved for the composite with the addition of 24 vol.% TiC nano-particles and 16 vol.% WC microparticles, with the flexural strength, fracture toughness and Vicker's hardness being 842 MPa, 6.82 MPa m 1/2 and 22.19 GPa, respectively. The microstructure and phase composition of the composites were characterized with scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). The fracture surface of the Al 2 O 3 /16 vol.%WC/24 vol.%TiC micro-nano-composite was characterized by a mix of intergranular and transgranular fracture as a result of the presence of both intergranular and intragranular secondary phase particles. It is believed that inhibition of matrix grain growth by intergranular secondary phase particles, sub-grain boundaries and dislocations pinning inside Al 2 O 3 grains induced by intragranular TiC nano-particles contribute to the strengthening of the composite. Meanwh

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Author

Jun Zhao; Xunliang Yuan; Yonghui Zhou

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0921-5093)

Published

2010

Language

EN

Field

Engineering (Physical Sciences)