Effect of Different Holding Time on Tribological Properties of AT13 Coating
Journal Title: 河南科技大学学报（自然科学版） - Year 2019, Vol 40, Issue 2
Abstract
Plasma spraying technology was utilized to deposit Al2 O3-Ti O2 coatings on 20 steel samples. The prepared coating was heat-treated at 500 ℃ for 1 h, 3 h and 5 h. The friction and wear performance of coatings were tested by QG-700 friction and wear tester. The microstructures, microhardness and phase compositions of the coatings were investigated by scanning electron microscopy, microhardness tester and X-ray diffraction, respectively. The results indicate that the original powders are mainly Al2 O3 and Al2 Ti O5 phases. Ti O is a new phase formed after spraying. The heat treatment does not change the phase composition of the coating. After heat treatment the microhardness of the coating decreases and the friction factor increases. The time for the coating to reach a stable wear stage after heat treatment is shortened. The wear marks of the coatings after heat treatment become lighter than those of the non-heat treated coatings. Heat treatment can reduce the wear rate of the coatings. The untreated and heat-treated coatings have wear debris and exfoliation pits. The main wear mechanism of the coating is exfoliation. Under the experimental conditions, the wear resistance of the coating is the best when the holding time is 5 h.
Authors and Affiliations
Chao LIU, Sanming DU, Hongzhang CAI, Zhenghai YANG, Yongzhen ZHANG
Keywords
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- EP ID EP422462
- DOI 10.15926/j.cnki.issn1672-6871.2019.02.001
- Views 138
- Downloads 0
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