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以Ti、W、C的元素粉末为原料,通过机械合金化法制备了(Ti,W)C固溶体粉末,结果表明:目标成分为(Ti0.95,W0.05)C、(Ti0.9,W0.1)C和(Ti0.85,W0.15)C的混合粉末经高能球磨后有(Ti,W)C固溶体生成,目标成分为(Ti0.8,W0.2)C的混合粉末经球磨后没有反应发生,X射线衍射图仍然为各组分的单质峰.将经8h球磨得到的目标成分为(Ti0.95,W0.05)C和(Ti0.9,W0.1)C的固溶体粉末与20wt%的Ni粉进行混和,压制成型后在1 450℃下烧结1h,得到的金属陶瓷的硬度和抗弯强度分别为88 HRA,1 636 MPa和88.7 HRA,1 693 MPa.两种成分的金属陶瓷的显微组织中均含有“白芯-灰环”结构、“黑芯-灰环”结构以及无芯-环结构的陶瓷晶粒.与钨含量较低的样品相比,钨含量较高的样品的晶粒尺寸以及“黑芯-灰环”结构中黑色芯相的尺寸较小,同时具有无芯结构和“白芯-灰环”结构的晶粒数目较多.

参考文献

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