Formation and Oxidation Behavior of β-Sialon-Melilite Solid Solution Ceramics

Abstract

Abstract: The formation behavior of the composition of β₁₀-Sialon(Si_5.23Al_0.77O_0.77N_7.23) plus 7.26wt% Nd-melilite solid solution (Nd₂Si₂AlO₄N₃) prepared by
pressureless sintering was studied. Nd ions in the composition enter α-sialon at low temperature, dissolve in the liquid phase of the material with
temperature increasing. Melilite solid solution can be formed as a grain boundary phase of the ceramics by heat-teatment at 1550℃ for 24h. The oxidation behavior
of the hot-pressed and post-sintered samples was also investigated in the range of 1000～400℃. The melilite solid solution doesn’t caues severe cracking
of the material in oxidation at 1000℃ At high temperature, the oxidized surface of the sample contains preferentially oriented A-Nd₂Si₂O₇ grains and bubbles,
which are formed because of the decrease of the silicate viscosity, incurred by the accumulation of Nd ions to the surface.

Key words: β-sialon, melilite, oxidation behavior

CLC Number:

TB323

ZHANG Jun-Hong,WANG Pei-Ling,JIA Ying-Xin,ZHANG Jiong. Formation and Oxidation Behavior of β-Sialon-Melilite Solid Solution Ceramics[J]. Journal of Inorganic Materials.

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Formation and Oxidation Behavior of β-Sialon-Melilite Solid Solution Ceramics

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