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通过对不同Mo含量的CrMoN复合涂层进行低温离子渗硫处理获得CrMoN/MoS2复合涂层,并对其组织结构及力学性能进行研究。扫描电镜分析显示出CrMoN复合涂层表面形貌比较致密,晶粒较大,而经过渗硫处理后的CrMoN/MoS2复合涂层呈现了疏松的颗粒状的形貌。由于渗硫过程是非反应成核扩散过程,期间没有发生择优生长,故晶粒尺寸受到抑制。对渗硫过程中可能发生的反应进行热力学计算,推断复合涂层中的Mo单质和MoNx均可与S元素发生反应生成MoS2,通过对CrMoN/MoS2复合涂层表面元素的化合价态进行分析,可知MoS2主要来源于MoNx与S发生的置换反应。纳米硬度测试结果表明,渗硫处理后的CrMoN复合涂层的纳米硬度和弹性模量都得到提高,力学性能得到提升。
CrMoN / MoS2 composite coatings were obtained by low-temperature ionized sulfur infiltration on CrMoN composite coatings with different Mo contents. The microstructure and mechanical properties of the coatings were studied. Scanning electron microscopy analysis showed that the surface morphology of the CrMoN composite coating is relatively dense and the grains are larger, while the CrMoN / MoS2 composite coating after the sulfurizing treatment presents a loose granular morphology. As the sulfurizing process is a non-reactive nucleation and diffusion process, during which no preferential growth occurs, the grain size is suppressed. Thermodynamic calculation of possible reactions in the process of sulfur infiltration can infer that both Mo and MoNx in the composite coating can react with S element to form MoS2. By analyzing the valence states of the elements in the surface of the CrMoN / MoS2 composite coating, MoS2 mainly comes from the displacement reaction of MoNx and S. The nano-hardness test results show that the nano-hardness and elastic modulus of the CrMoN composite coating after the sulfurizing treatment are both improved and the mechanical properties are improved.