Si<sub>3</sub>N<sub>4</sub>とアルミニウムイソプロポキシドからのβ-サイアロンの合成

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書誌事項

タイトル別名
  • Synthesis of β-Sialon from Si<sub>3</sub>N<sub>4</sub> and Aluminum-Iso-Propoxide
  • Si3N4 ト アルミニウム イソプロポキシド カラ ノ ベータ サイアロン

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β-sialon with z=0.25, 0.5, 0.75, 1 and 2 in Si6-zAlzOzN8-z was fabricated from Al(Oi-Pr)3/tetrahydrofuran solution containing α-Si3N4 particles. The solution was ball milled for 24h, hydrolyzed, dried and calcined at 900°C for 2h in air. The mixture consisted of α-Si3N4 and alumina was hot-pressed at 1850°C for 1h under a pressure of 300kg/cm2. Three-point bending strength, phases and microstructure were investigated. β-sialon with z=0.25 was not fully densified (88% of theoretical). β-sialon with z=0.5, 0.75, 1 and 2 showed complete densification. β-sialon with z=0.25 consisted of β-sialon, a small amount of α-Si3N4 and O′ phase. β-sialon with z=0.5 consisted of β-sialon and a small amount of O′ phase. β-sialon with z=0.75 consisted of β-sialon, a small amount of O′ and X phases. β-sialon with z=1 and 2 consisted of β-sialon and X phase respectively. β-sialon with z=0.5, 0.75 and 1 consisted of 0.5-1μm equiaxed grains and boundary phase. Its microstructure was very homogeneous and defects such as pore, clusters of large grains which were found in β-sialon fabricated from the mixture of α-Si3N4 and α-Al2O3 powders were not observed. In most of all β-sialon, fracture originated from surface flaws caused by machining. The strength of β-sialon with z=0.5 was much improved (67kg/mm2 in average, 72kg/mm2 in maximum) comparing with β-sialon (z=0.5-1) fabricated from the mixture of α-Si3N4 and α-Al2O3 powders (50kg/mm2 in average). The strength of β-sialon with z=2 showed a very low value of 14kg/mm2 in average which was caused by the aggregation of Al(OH)3 during hydrolysis of Al(Oi-Pr)3.

収録刊行物

  • 窯業協會誌

    窯業協會誌 93 (1082), 629-635, 1985

    公益社団法人 日本セラミックス協会

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