Microstructure and Mechanical Properties of In Situ Al₂O₃- Ti(C,N) Composites

Abstract:

Al₂O₃-Ti(C,N)composite ceramics were prepared by in situ aluminothermic reduction and pressureless sintering. The effects of different Ti(C,N) contents and sintering temperatures on microstructure and mechanical properties (bulk density ,apparent porosity and blending strength)of samples were investigated through experiments.The results show that Al₂O₃-Ti(C,N) composite ceramics with 10 wt.% Ti(C,N) prepared using titanium dioxide and metal aluminum powder as raw materials and sintered at 1300 °C for 3h under a flowing nitrigen stream have good properties ,with bulk density 2.94g/cm³,apparent porosity 26.4%, and blending strength reaches to 28.04 MPa. According to the microstructure analysis,the fine in situ synthesis Ti(C,N) particles are uniformly dispersed in tabular alundum matrix. Ti(C,N) and tabular alundum phases are closely combined and can inhibit grain growth each other,which is benefical in improving the comprehensive properties of composite ceramics.

• Periodical: Advanced Materials Research (Volumes 239-242)
• Pages: 1243-1247
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.239-242.1243
• Online since: May 2011
• Authors: Xiu Mei Feng, Xiao Qing Lian, Ming Xue Jiang, Yi Ner He
• Keywords: Aluminothermic Reduction, Composite, In Situ Synthesis, Ti(C,N)

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