Preparation and wide temperature range tribological behavior of VN-Ag-MoO3 composites
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摘要: 利用真空热压烧结技术制备了VN-Ag-MoO3复合材料,研究了Ag2MoO4对VN基复合材料组织结构及宽温域摩擦磨损性能的影响。结果表明:VN-Ag-MoO3复合材料组织较致密,主要由VN、MoO3和Ag组成,其中均匀分布于VN基体的MoO3和Ag由Ag2MoO4经高温分解形成。宽温域摩擦磨损测试表明,Ag2MoO4的添加有效改善了室温(RT)~700℃温域范围VN陶瓷的摩擦磨损性能。其中,700℃时Ag2MoO4含量为10wt%的VN-10Ag-MoO3的摩擦系数(0.285)和磨损率(1.37×10−5 mm3/(N·m))分别较VN降低了23%和72%,这归因于磨损表面的氧化钒、钒酸银和钼酸银等高温润滑相起到了优异的润滑及减磨作用。Abstract: VN-Ag-MoO3 composites were prepared by vacuum hot pressing sintering. The effects of Ag2MoO4 on the microstructure and wide temperature range friction and wear properties of VN matrix composites were investigated. The results show that the structure of VN-Ag-MoO3 composite is relatively compact, mainly composed of VN, MoO3 and Ag, and the MoO3 and Ag distributed evenly in VN matrix are formed by the decomposition of Ag2MoO4 at high temperature. Friction and wear tests in a wide temperature range show that the addition of Ag2MoO4 can effectively improve the friction and wear properties of VN ceramics in the temperature range of room temperature (RT)-700℃. The friction coefficient (0.285) and wear rate (1.37×10−5 mm3/(N·m)) of VN-10Ag-MoO3 with 10wt% Ag2MoO4 at 700℃ are 23% and 72% lower than those of VN, respectively, which are attributed to the excellent lubrication and wear reduction effects of high temperature lubrication phases such as vanadium oxide, silver vanadate and silver molybdate on the wear surface.
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图 5 不同温度时VN-Ag-MoO3复合材料的磨损形貌
Figure 5. SEM morphologies of worn surfaces of VN-Ag-MoO3 composites at different temperatures ((a) VN- 5Ag-MoO3, RT; (b) VN-10Ag-MoO3, RT; (c) VN-15Ag-MoO3, RT; (d) VN-5Ag-MoO3, 300℃; (e) VN-10Ag-MoO3, 300℃; (f) VN-15Ag-MoO3, 300℃; (g) VN-5Ag-MoO3, 500℃; (h) VN-10Ag-MoO3, 500℃; (i) VN-15Ag-MoO3, 500℃; (j) VN-5Ag-MoO3, 700℃; (k) VN-10Ag-MoO3, 700℃; (l) VN-15Ag-MoO3, 700℃)
图 6 不同温度时VN-Ag-MoO3复合材料的磨痕三维轮廓图
Figure 6. Three-dimensional wear profiles of worn surfaces of VN-Ag-MoO3 composites at different temperatures((a) VN- 5Ag-MoO3, RT; (b) VN-10Ag-MoO3, RT; (c) VN-15Ag-MoO3, RT; (d) VN-5Ag-MoO3, 300℃; (e) VN-10Ag-MoO3, 300℃; (f) VN-15Ag-MoO3, 300℃; (g) VN-5Ag-MoO3, 500℃; (h) VN-10Ag-MoO3, 500℃; (i) VN-15Ag-MoO3, 500℃; (j) VN-5Ag-MoO3, 700℃; (k) VN-10Ag-MoO3, 700℃; (l) VN-15Ag-MoO3, 700℃)
表 1 VN-Ag-MoO3复合材料的命名
Table 1. Naming of VN-Ag-MoO3 composites
Sample Ag2MoO4/wt% VN 0 VN-5Ag-MoO3 5 VN-10Ag-MoO3 10 VN-15Ag-MoO3 15 表 2 各元素在VN-Ag-MoO3系复合材料中的含量
Table 2. Element content of VN-Ag-MoO3 composites
wt% Sample Chemical composition V N Ag Mo O VN 77.45 16.50 − − 4.41 VN-5Ag-MoO3 78.08 12.60 3.32 1.58 3.75 VN-10Ag-MoO3 76.15 10.35 5.54 2.48 4.82 VN-15Ag-MoO3 73.75 9.26 7.09 2.75 6.32 表 3 VN-Ag-MoO3系复合材料的硬度及密度
Table 3. Hardness and density of VN-Ag-MoO3 composites
Composition Hardness/HV Density/(g·cm−3) VN-5Ag-MoO4 1189.45 5.81 VN-10Ag-MoO4 1226.50 5.92 VN-15Ag-MoO4 1170.40 6.10 -
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