Combustion Synthesis of α-Si3N4 Powder Using AC as Additive

doi:10.3724/SP.J.1077.2012.00169

Abstract

Abstract:

Combustion synthesis (CS) of high content of α-Si₃N₄ powders was carried out using Si and Si₃N₄ powders as reactants with the addition of diazenedicarboxamide (AC) at a relatively low N₂ pressure of 3 MPa. The phase compositions and microstructure of products were characterized by XRD and SEM. Effects of AC contents on the phase compositions and Si₃N₄ particles morphology were studied. In addition, the reaction mechanisms were discussed. The results indicated that the additive AC promoted the nitridation of Si. The α-Si₃N₄ contents in the combustion-synthesized products showed great dependence on the contents of AC added in the reactants, which reached 85.2wt% adding with 24wt% AC. Meanwhile, impurities such as SiC, Si₂N₂O could be found in the final products when more than 12wt% AC agent was added. Poor dispersibility of Si₃N₄ particles would be more serious with increasing AC contents in the reactants. N₂, CO and NH₃ produced by decomposition of AC leaded to a change of compact porosity, thermal convection and mass transfer processes, which was responsible for the increasing contents of α-Si₃N₄ and the discrepancy morphology of the products.

Key words: AC foaming agent, Si₃N₄, combustion synthesis

CLC Number:

TG164

CHEN Yi-Xiang, YANG Jian-Hui, JIANG Zhi-Jun, LIN Zhi-Ming, LI Jiang-Tao. Combustion Synthesis of α-Si₃N₄ Powder Using AC as Additive[J]. Journal of Inorganic Materials, 2012, 27(2): 169-173.

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Combustion Synthesis of α-Si₃N₄ Powder Using AC as Additive

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