Low-temperature Combustion Synthesis of Al2O3-LaPO4 Composite Powders and the Properties of the Composite

doi:10.3724/SP.J.1077.2007.00065

Abstract

Abstract: Al₂O₃-LaPO₄ composite powders were synthesized by low-temperature combustion synthesis using Al(NO₃)₃, LaPO₄ and citric acid as raw materials. The relative density of hot-pressed ALC50(prepared by combustion-synthesized powders) was 98.5% and improved 2.5% in comparision with ALM50 (prepared by ball-milling of powders mixtures). It is shown that the average grain size of ALC50(0.56μm) is μch smaller than that of ALM50 (1.74μm). The bending strength and fracture toughness of ALC50 are respectively increased by 11.1% and 11.2% while the hardness of ALC50 is almost the same. The drilling rate of ALC50 increases by approximately 50% as compared with that of ALM50 due to the increasement of weak interface.

Key words: combustion synthesis, Al2O3-LaPO4 composite powders, mechanical properties, machinability

CLC Number:

TQ174

GONG Guo-Liang,ZHANG Bao-Lin,LI Wen-Lan,ZHUANG Han-Rui. Low-temperature Combustion Synthesis of Al₂O₃-LaPO₄ Composite Powders and the Properties of the Composite[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2007.00065.

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Low-temperature Combustion Synthesis of Al₂O₃-LaPO₄ Composite Powders and the Properties of the Composite

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