Effect of α-Al2O3 on in situ synthesis low density O′-sialon multiphase ceramics |
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Authors: | Yue ShaoXiaolei Li Huiming JiXiaohong Sun Pei Cao |
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Affiliation: | Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, PR China |
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Abstract: | In this paper, the effect of α-Al2O3 on in situ synthesis low density O′-sialon multiphase ceramics was investigated. Thermodynamics analysis was used to illustrate the feasibility of synthesizing O′-sialon at a low temperature of 1420 °C. The crystalline phase and microstructure were investigated by X-ray diffraction (XRD) and scanning electron microscope (SEM), respectively. The actual substitution parameter x value of O′-sialon was estimated via lattice correction. The results showed that, O′-sialon multiphase ceramics with different x values could be synthesized successfully through varying α-Al2O3 content. Bulk densities of samples ranging from 1.64 to 2.11 g cm−3 were adjusted with the percentage of α-Al2O3 increasing from 5.21 wt.% to 15.62 wt.%. Formation of nearly single-phase O′-sialon was obtained in the sample containing 10.42 wt.% α-Al2O3. The actual substitution parameter x increased with the increase of α-Al2O3, whereas it was lower than the original designation, and the O′-sialon with a low x value was achieved. |
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Keywords: | O&prime -sialon multiphase ceramics α-Al2O3 Mechanism study Phase composition Lattice correction |
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