ABSTRACT

The WC–12Co coatings were deposited on SS 410 substrates using a high-velocity oxygen fuel (HVOF) process and the coatings were heat-treated at 750°C for 1 h in argon environment. Further, the coatings were subjected to cryogenic treatment for 1, 2, 8 and 24 h, and its influence on the reciprocating sliding wear and corrosion characteristics was studied. The structural changes in the coatings after post-treatment were assessed by X-ray diffraction analysis and Raman spectroscopy. Microhardness was improved for cryogenically treated coatings due to the α-Co transformation into ϵ-Co. Cryogenic treatment duration was not having a significant effect on the microhardness values. However, the specific wear rate was influenced by the cryogenic treatment duration. Also, corrosion resistance was increased with the increased cryogenic treatment duration. The protective layers consisting of WO₃ and Co₃O₄ phases formed during the cryogenic treatment are attributed to the improved corrosion resistance of the coatings.

摘要

采用高速氧燃料 (HVOF) 工艺在 SS 410 基材上沉积 WC-12Co 涂层，并在氩气环境中于 750°C 下热处理 1 小时。进一步对涂层进行1、2、8和24 h深冷处理，研究其对往复滑动磨损和腐蚀特性的影响。通过X射线衍射分析和拉曼光谱评估后处理后涂层的结构变化。由于 α-Co 转变为 ϵ-Co，低温处理涂层的显微硬度得到改善。低温处理持续时间对显微硬度值没有显着影响。然而，具体磨损率受到低温处理持续时间的影响。此外，耐腐蚀性随着低温处理持续时间的增加而增加。_{深冷处理过程中形成的Co 3} O 4 相和Co ₃ O ₄相归因于涂层耐腐蚀性能的提高。