FABRICATION AND PROPERTIES OF TiN/O’-Sialon ELECTROCONDUCTIVE COMPOSITES

Acta Metall Sin

2007, Vol. 43

Issue (2): 131-136 DOI:

Research Articles

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FABRICATION AND PROPERTIES OF TiN/O’-Sialon ELECTROCONDUCTIVE COMPOSITES

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东北大学

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;. FABRICATION AND PROPERTIES OF TiN/O’-Sialon ELECTROCONDUCTIVE COMPOSITES. Acta Metall Sin, 2007, 43(2): 131-136 .

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Abstract The TiN/O′-Sialon electroconductive composite were fabricated by pressureless sintering from TiN/O′-Sialon powder that was synthesized by the carbothermal reduction nitridation method using high titania slag as the chief raw material. Phase assembly and microstructure were analyzed by X-ray diffractometry (XRD) and scanning electron microscopy (SEM). The effect of TiO2 content in initial raw materials on densification, mechanical properties and electrical conductivity were studied. The results show that O′-Sialon and TiN exist in the sintered samples. The O′-Sialon grains exhibit equiaxied morphology and the grain size is about 1~3mm. The TiN particles show fine granular morphology, with most of the grains lower than 0.5mm in size. For the composite samples sintered at 1500℃ using raw materials containing 30wt%TiO2, bulk density, hardness and flexure strength is 3.1g/cm3, 9.2GPa and 169MPa, respectively. The minimum amount of TiO2 in initial raw materials is 25wt% for the formation of electroconductive network in the composites. The electric resistivity of such a composite is 1.8×10-2Ω·cm.

Key words: TiN/O¢ electroconductive composite microstructure densification mechanical property

Received: 29 May 2006

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TQ174.75

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