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金刚石颗粒弥散WC-Co复合物的烧结及其韧化

, PP. 51-55

Keywords: 金刚石,SiC涂层,SPS,WC-Co,韧性

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Abstract:

采用放电等离子烧结(SPS)方法制备了金刚石颗粒(平均粒径为12μm、25μm及50μm)以20%的体积比弥散WC-10wt%Co硬质合金的致密复合物,为防止金刚石颗粒的氧化和石墨化,用高温化学反应方法在其表面生成了一层牢固结合的纳米尺寸的碳化硅保护膜。所得烧结体的相对密度均可达到98%。弥散金刚石颗粒基本保持了基体的高硬度,但是使复合物的断裂韧性得到了显著提高,金刚石粒度为50μm时,韧性高达17.8MPa·m1/2。沿金刚石颗粒周围可以清晰地观察到裂纹偏转及停止现象。金刚石粒度的变化对力学性能的影响不很明显。

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