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Ti3SiC2结合立方氮化硼超硬复合材料的制备与微观结构

DOI: 10.7521/j.issn.0454-5648.2014.02.14

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Abstract:

以Ar气氛保护管式炉常压合成的Ti3SiC2粉体和商业立方氮化硼微粉为原料,采用六面顶压机,在4.5GPa、1050℃保温10min的条件下制备出Ti3SiC2结合立方氮化硼超硬复合材料。用扫描电子显微镜观察了复合材料的微观结构,用X射线衍射和电子能谱分析样品的结构和成分。结果表明立方氮化硼颗粒均匀地分布在基体中,且两者界面结合良好;磨损实验之后,立方氮化硼颗粒仍然与基体结合良好。复合材料基体主要成分为Ti3SiC2以及少量TiC作为第二相。用气氛保护管式炉不能在常压条件下制备这种复合材料,主要原因不是立方氮化硼在常压条件下的高温相变,而是Ti3SiC2在氮化硼存在时的高温分解。

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