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用 XRD、SEM和 DTA等分析检测手段 ,研究了高能球磨过程中 ,掺 La硬质合金粉末的结构、形貌和相的变化。结果表明 :微量 La的加入 ,有利于硬质合金粉末晶粒的细化 ;高能球磨 1 0 h,即可获得晶粒度为 30 nm的掺 La硬质合金粉末 ;高能球磨 2 0 h,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 h,可获得晶粒度约 1 0 nm的掺 La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℃温度范围内加热时 ,高能球磨掺 La硬质合金粉末出现了明显的结构弛豫 ,说明粉末晶粒内部产生了许多缺陷 ,如 :内应力、位错、晶格畸变等
XRD, SEM and DTA were used to analyze the change of structure, morphology and phase of lanthanum-doped La powder during high-energy ball milling. The results show that the addition of trace amount of La can promote the grain refinement of the cemented carbide powder. High-energy ball milling can obtain La-Ce powder with a grain size of 30 nm after 10 h of high-energy ball milling. The X-ray diffraction peak of the phase disappears, indicating that the Co phase has completely dissolved or subsolidally dissolved in the WC phase. High-energy ball milling 30 h, available grain size of about 10 nm La-doped cemented carbide powder. DTA analysis showed that compared with the powders before high-energy ball milling, the high-energy ball milling La-hard alloy powders exhibited obvious structural relaxation when heated at the temperature range of 30 0 ~ 60 0 ℃, indicating that many internal Defects, such as: internal stress, dislocation, lattice distortion and so on