采用金属粉末注射成形技术成功制得了形状复杂的纯钨和纯钼零件.粉末注射成形工艺为: 粉末装载量为52%, 注射温度为165 ℃, 注射压力为65 MPa, 溶剂脱脂+热脱脂两步脱脂法, 经2300 ℃氢气气氛烧结, 钨烧结样品的密度可达18.26 g·cm-3, 相对密度为94.61%;经1900 ℃氢气气氛烧结, 钼烧结样品的密度为9.7 g·cm-3, 相对密度达95.09%, 制品尺寸精度控制在±0.3%以内.同时, 通过实验对比研究了掺加少量的稀土氧化物(La2O3, Y2O3)对注射成形钨和钼制品性能的影响.实验结果表明: 稀土元素氧化物的添加, 提高了注射成形钨和钼制品烧结后的密度, 明显细化了烧结后样品的晶粒, 稀土氧化物作为第二相粒子弥散分布于晶界处, 提高了注射成形钨和钼制品的强度.
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