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采用高能球磨法 ,制备出了晶粒度约 1 1nm的掺Ce硬质合金粉末。用XRD、SEM和DTA等分析检测手段 ,研究了高能球磨过程中 ,掺Ce硬质合金粉末的结构、形貌和相的变化。结果表明 :微量Ce的加入 ,有利于硬质合金粉末晶粒的细化 ;高能球磨 1 0小时 ,即可获得晶粒度为 30nm的掺Ce硬质合金粉末 ;高能球磨 2 0小时 ,Co相的X ray衍射峰消失 ,说明Co相已完全固溶或亚固溶于WC相中 ;高能球磨 30小时 ,可获得晶粒度约 1 1nm的掺Ce硬质合金粉末。DTA分析表明 ,与高能球磨前的粉末相比 ,在 30 0～ 60 0℃加热时 ,高能球磨掺Ce硬质合金粉末出现了明显的结构驰豫
Using high-energy ball milling method, prepared a grain size of about 1 1nm Ce-doped cemented carbide powder. XRD, SEM and DTA were used to analyze the change of structure, morphology and phase of Ce-doped cemented carbide powders in high-energy ball milling. The results show that the addition of trace Ce is beneficial to the grain refinement of the cemented carbide powder. After high energy ball milling for 10 hours, Ce-doped cemented carbide powder with the grain size of 30nm can be obtained. X-ray diffraction peaks disappear, indicating that the Co phase has been completely solid solution or subsolidally dissolved in the WC phase; high-energy ball milling 30 hours to obtain a grain size of about 1 1 nm Ce-doped cemented carbide powder. DTA analysis showed that compared with the powder before high-energy ball milling, when heated at 30 0 ~ 60 0 ℃, there was a significant structural relaxation of high-energy ball milling Ce-containing cemented carbide powder