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现代制造业的迅速发展对WC基硬质合金涂层的硬度、断裂韧性、耐磨性等使用性能提出了越来越高的要求。本文设计制备了含有WB化合物的新型WC-WB-Co硬质合金涂层。针对不同WB含量的WC-WB-Co涂层的相组成和断裂韧性进行了研究,利用材料体视学方法定量化分析了裂纹扩展形式及路径,提出了断裂韧性的变化机制。研究结果表明:WC-WB-Co涂层中有三元W-Co-B相生成;设计制备的新型硬质合金涂层具有高的断裂韧性;新型涂层增韧机理是高硬度W-Co-B相的存在有效增大了裂纹扩展阻力,并使涂层中裂纹扩展路径发生变化,提高了裂纹扩展所需能量,从而使涂层的断裂韧性得到增强。
The rapid development of modern manufacturing industry WC-based carbide coating hardness, fracture toughness, wear resistance and other performance requirements put forward higher and higher. In this paper, a new WC-WB-Co cemented carbide coating containing WB compounds was designed and prepared. The phase composition and fracture toughness of WC-WB-Co coatings with different WB contents were studied. The material morphology was used to quantitatively analyze the crack propagation pattern and path, and the mechanism of fracture toughness was proposed. The results show that the WC-WB-Co coating has a ternary W-Co-B phase. The new hardmetal coating designed and prepared has high fracture toughness. The toughening mechanism of the new coating is W-Co- The presence of B phase effectively increases the crack propagation resistance, changes the crack propagation path in the coating, increases the energy required for crack growth, and enhances the fracture toughness of the coating.