Academy of Armored Forces Engineering, Beijing 100072, China

摘要:

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。

Abstract:

CrMoN/MoS2 composite coatings were prepared on the surfaces of the CrMoN composite coatings with different Mo contents by means of a low temperature ion sulfurizing process. The structural and mechanical properties of these coatings as a function of Mo content have been studied. SEM analysis shows that the CrMoN coating reveals a dense and compact surface structure, the CrMoN/MoS2 composite coatings display loose grain structures; In the sulfurizing process, a preferential growth does not happen, the sulfide size is inhibited, The products of the reaction between MoNx and S are the main origin of MoS2.Nanoindentation test shows that the hardness and Young’s modulus of CrMoN/MoS2 coatings are higher than that of CrMoN composite coatings.