文献类型：期刊文献

英文题名：Optimization of depositing uniform and wear-resistant diamond films on massive mechanical seals

作者：He, Yun[1];Sun, Fanghong[2];Lei, Xuelin[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai, Peoples R China;[2]Shanghai Jiao Tong Univ, Sch Mech Engn, Shanghai, Peoples R China

年份：2018

卷号：70

期号：1

起止页码：97

外文期刊名：INDUSTRIAL LUBRICATION AND TRIBOLOGY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000425601400012)】；

基金：This research is supported by the National Science Foundation of China (No. 51705155), the China Postdoctoral Science Foundation (No. 2016M591614), the Shanghai Sailing Program (17YF1403100) and the Fundamental Research Funds for the Central Universities (No. 222201514314).

语种：英文

外文关键词：Sealing performance; Diamond film; Mechanical seal; Polishing property

摘要：Purpose This study aims to obtain diamond-coated mechanical seals with improved sealing performance and considerable cost. To achieve this purpose, the study focuses on depositing uniform, wear-resistant and easily polished diamond coatings on massive mechanical seals in a large-scale vacuum chamber. Design/methodology/approach The computational fluid dynamics simulation test and its corresponding deposition experiment are carried out to improve the uniformity of diamond films on massive mechanical seals. The polishing properties and sealing performance of mechanical seals coated with three different diamond films (microcrystalline diamond [MCD], nanocrystalline diamond [NCD] and microcrystalline/nanocrystalline diamond [MNCD]) and uncoated mechanical seals are comparatively studied using the polishing tests and dynamic seal tests to obtain the optimized diamond coating type on the mechanical seals. Findings The substrate rotation and four gas outlets distribution are helpful for depositing uniform diamond coatings on massive mechanical seals. The MNCD-coated mechanical seal shows the advantages of high polishing efficiency in the initial polishing process and excellent wear resistance and self-lubrication property in the follow-up polishing period because of its unique composite diamond film structures. The MNCD-coated mechanical seal shows the longest working life under dry friction condition, about 14, 1.27 and 1.9 times of that for the uncoated, MCD and NCD coated mechanical seals, respectively. Originality/value The effect of substrate rotation and gas outlets distribution on temperature and gas flow field during diamond deposition procedure is simulated. The MNCD-coated mechanical seal exhibits a superior sealing performance compared with the MCD-coated, NCD-coated and uncoated mechanical seals, which is helpful for decreasing the operating system shut-down frequency and saving operating energy consumption.