Corrosion Resistance of Ceramics and High-Temperature Phase Change of Powders on Cubic Silicon Nitride

Abstract:

An installation, consisting of an explosive-driven planar flyer and a cylindrical chamber, was designed to synthesize γ-Si₃N₄ with cubic spinel structure using the mixtures of impure α-Si₃N₄ and copper powders as starting materials. Sintering of γ-Si₃N₄ with Y₂O₃-Al₂O₃-La₂O₃ as additives were studied under pressures of 5.7 GPa and temperatures of 1370K. The corrosion resistance of γ-Si₃N₄ sintered compact to hydrofluoric acid was investigated at temperature between 490K and 500K, and its thermal stability of γ-Si₃N₄ powder prepared by shock wave synthesis was studied at temperature between 1670K and 1690K in a nitrogen atmosphere. The results show that γ-Si₃N₄ sintered compact could not react with hydrofluoric acid at 490K. At 500K, γ-Si₃N₄ sintered compact could reaction with hydrofluoric acid slowly, and 0.2g γ-Si₃N₄ sintered compact quality reduced 0.013g after 6h. The γ-Si₃N₄ sintered compact could not react with hydrochloric acid, nitric acid, sulfuric acid and universal solvent at 500K. The γ-Si₃N₄ powder was quite stable and without phase transformation at 1670K, and after soaking at 1680K for 10 min and 30 min, the ratio of transformation from γ-Si₃N₄ to β-Si₃N₄ is about 0% and 80%, respectively. The γ-Si₃N₄ powder could be completely transformed into β-Si₃N₄ after soaking at 1690K for 30 min. Keywords: cubic silicon nitride; shock wave synthesis; phase transformation; corrosion

• Periodical: Materials Science Forum (Volumes 704-705)
• Pages: 853-857
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.704-705.853
• Online since: December 2011
• Authors: Huai Yao, Guang Lin Zhu, Meng Du
• Keywords: Corrosion, Cubic Silicon Nitride, Phase Transformation, Shock Wave Synthesis

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