MATERIALS AND SUSTAINABLE DEVELOPMENT:GREEN MANUFACTURING AND PROCESSING OF MATERIALS |
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Low Temperature Synthesis of α-Si3N4 Powders via High-energy Ball MillingCombined with Salt-assisted Nitridation |
ZHANG Jing1,2, LI Hongxia1, LIU Guoqi1
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1 State Key Laboratory of Advanced Refractories, Sinosteel Luoyang Institute of Refractories Research Co., Ltd, Luoyang 471039; 2 Sinoma Advanced Nitride Ceramics Co., Ltd, Zibo 255000 |
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Abstract α-Si3N4 powders were synthesized by a method combined high-energy ball milling with salt-assisted nitridation using silicon powders as raw materials, and NaCl-NaF as reaction medium and diluents. The effects of nitridation temperature, holding time, salt/silicon ratio and NaF content (with in NaCl+NaF) on the formation of α-Si3N4 were investigated. The phase composition and microstructure of the samples were analysed and characterized by XRD and FE-SEM. The results showed that the complete nitridation of silicon powders can be achieved at salt/silicon ratio of 2∶1 and NaF content of 10% after a 1 200 ℃ and 4 h heat treatment. The formation of α-Si3N4 whiskers with 40—280 nm in diameter and several microns to tens of microns in length was observed in the final products. The crystal growth process of α-Si3N4 whiskers follows vapor-crystal (VC) mechanism.
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Published: 12 March 2019
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