摘要
采用高能球磨和放电等离子体烧结技术制备了93W-4.9Ni-2.1Fe-xCeO_2高比重合金,通过XRD、SEM、显微硬度计及摩擦磨损试验机等研究了稀土CeO_2添加量对W-Ni-Fe高比重合金物相、显微组织及摩擦磨损行为等的影响。结果表明,微量稀土氧化物掺杂后,W衍射峰出现不同程度的宽化现象,晶粒得到细化,生成的复合稀土相Ce_xW_yO_z可以促进Ni、Fe在W晶格中的固溶。显微硬度不断减小,相对密度呈现先上升后下降的趋势,当添加含量为0.4 wt%时,相对密度最大。稀土氧化物CeO_2的添加一定程度上降低了合金试样的摩擦磨损性能。当添加量为0.4 wt%时,粘结相分布相对较均匀,W-W之间的界面结合强度较高,相对密度达都最大,合金致密化程度最高,致使磨损曲线比较稳定,对材料耐磨性能的影响程度最小。
引文
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