使用钻岩工具时,一般要求在不断裂的前提下提高其耐磨性,因而保证一定的韧性是对钻岩硬质合金的基本要求.基于此前提,综述了影响WC-Co合金断裂韧性KIc的因素、机理和主要模型;钻岩合金的工作类型、断裂形式和提高其断裂韧性的方法.归纳出以下主要结论:以沿wc/wc的脆断、沿WC/Co的脱裂、穿WC相的劈断和穿7相层的撕裂为WC-Co合金的基本断裂形式;两相WC-Co合金的断裂韧性KIc主要取决于γ相的体积分数、分布及成分;热疲劳裂纹的形成和扩展是导致钻齿破坏的最主要原因.
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