Research on Friction and Wear Properties of CaF2/TiC/ Ni-Base Alloy Composite  Coatings at Different Temperatures

doi:10.3969/j.issn.1000-1093.2014.06.022

Abstract

Abstract: In order to improve the friction and wear properties of Ni-base alloy composite coatings in the condition of rigor friction , especially in the condition of high temperature dry friction, Ni-base alloy composite coating modified by CaF₂ and TiC particles is prepared on the surface of 45 carbon steel. The microstructure of composite coating is analyzed. The tribological behaviors and mechanisms of the composite coating are researched. The results show that CaF₂/TiC/Ni-base alloy composite coating presents the lamellar microstructure, which is composed of the phases of γ-Ni, CrB, Cr₇C₃, TiC and CaF₂. The CaF₂/TiC/Ni-base alloy composite coating has excellent anti-friction and anti-wear properties at various temperatures. The friction coefficient of the composite coating decreases from 0.42 to 0.29 as the temperature increase from room temperature to 500 ℃, which is 16.2%～33.9% less than that of Ni-base alloy coating. The wear losses of the composite coating gradually decrease as the temperature increases, which is sharply reduced compared with that of Ni-base alloy coating. The transferred layer is prepared on the worn surface of the composite coating at 500 ℃. The transferred layer contains CaF₂ which has the anti-friction effect at high temperature, so the friction coefficient of the composite coating is reduced. The wear mechanism of the composite coating is mainly the fatigue delamination of the transferred layer. The coverage area of the transferred layer, which may protect the composite coating, increases with temperature. So the wear loss of the composite coating decreases with the increasing temperature.

Key words: composite material, coating, high temperature, anti-friction, anti-wear

CLC Number:

TG117

CAI Bin， TAN Ye-fa， TANG Jian， TAN Hua， WANG Wei-gang. Research on Friction and Wear Properties of CaF₂/TiC/ Ni-Base Alloy Composite Coatings at Different Temperatures[J]. Acta Armamentarii, 2014, 35(6): 900-907.

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Research on Friction and Wear Properties of CaF₂/TiC/ Ni-Base Alloy Composite Coatings at Different Temperatures

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