Effects of heat treatment on the structures and wear behaviors of HVOF-Sprayed NiMoS2Coatings

Jiun Ren Hwang, Yu Liang Liu, Chia Hua Chang, Ming Chang Jeng

研究成果: 雜誌貢獻期刊論文同行評審

2 引文 斯高帕斯(Scopus)


Numerous studies have addressed the augmentation of the hardness and tribological properties of material surfaces with the aim of diminishing the wear. However, there is significant scope for further enhancing the performance of self-fluxing nickel alloys utilized as abrasionresistant coatings. In this work, NiMoS2powders were prepared by electroless plating, and high-velocity oxy-fuel (HVOF) spraying was used to prepare low-coefficient-of-friction coatings with these powders. The coatings were then subjected to heat treatment. Various surface analysis techniques including hardness testing, scanning electron microscopy, and X-ray fluorescence were subsequently used to characterize the compositions and mechanical properties of the composite HVOF coatings. In addition, ball-on-disc tests were performed under dry abrasive conditions on specimens that were heat treated at different temperatures according to the ASTM G99 standard. The wear of each specimen was evaluated, and the measurements were used to provide a comprehensive assessment of the coating's wear resistance. When the NiMoS2composite coating was heat treated at 500°C, the growth of MoO2crystals evaporates from the surface, and condenses on the protruding oxide crystals, which led to an increase in porosity and structural looseness. Consequently, the hardness and structural strength of the coating decreased significantly, dramatically increasing its wear loss. The HVOF NiMoS2composite coatings are suitable for high-Temperature abrasion environments with temperatures below 500°C, and an operating temperature of 500°C or higher should be avoided to maintain its hardness, structural strength, and wear resistance.

頁(從 - 到)1813-1819
期刊Materials Transactions
出版狀態已出版 - 1 9月 2020


深入研究「Effects of heat treatment on the structures and wear behaviors of HVOF-Sprayed NiMoS2Coatings」主題。共同形成了獨特的指紋。