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采用低温液氮高能球磨技术制备了(Ni-20%Cr)/35%WC(质量分数)纳米复合体系,研究了纳米材料的微观组织和热稳定性.结果表明,随着球磨时间的增加,粉末晶粒度在12 h前下降较明显,然后呈缓慢下降的趋势;球磨21 h后,NiCr合金粉末晶粒度达到10.02 nm,WC粉末晶粒度达到20.2 nm,且粉体粒度均匀,形状近似于球形,每个颗粒仍然是多晶结构;经过长时间球磨后,纳米粉末的结构没有发生变化,热稳定性良好;在1000℃保温0.5 h后,NiCr合金粉末长大至74 nm,WC粉末长大至28 nm.

参考文献

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