Effect of SnAgCu-Al2O3 on TiNi Lubrication Behavior at Different Texture Angles

XIONG Yahui, LIN Haibo, XIONG Bangying, YANG Kang

Surface Technology ›› 2024, Vol. 53 ›› Issue (17) : 103-111.

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Surface Technology ›› 2024, Vol. 53 ›› Issue (17) : 103-111. DOI: 10.16490/j.cnki.issn.1001-3660.2024.17.009
Friction, Wear and Lubrication

Effect of SnAgCu-Al2O3 on TiNi Lubrication Behavior at Different Texture Angles

  • XIONG Yahui1, LIN Haibo1, XIONG Bangying2, YANG Kang3
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Abstract

High-nickel-titanium-based alloys (TiNi) have the advantages of low density, high strength, corrosion resistance, and high temperature resistance. TiNi-based alloys are often used instead of traditional steel to prepare aerospace bearings. However, the TiNi alloys have large friction coefficients and poor wear resistance, which reduce the accuracy and service life of the bearing. Therefore, it is an effective way to improve the tribological properties of TiNi materials by using bionic methods to build microstructures on the surface and filling solid lubricants to achieve self-compensating lubrication. Since the combination of the biomimetic surface structure and the solid lubricant determines the functionality of the composite structure, the work aims to design and prepare the surface texture of fish scales on the surface of TiNi-based alloy based on biomimetic methods. In order to fully utilize the performance of the solid lubricant, the composition and proportions of the lubricant were designed. Finally, the effect of the synergistic effect of between the surface structure angle parameters and the lubricant on the tribological properties of the material surface was analyzed. For the preparation of TiNi-based alloys, Ti, Ni, Al, Nb, Mo, Si and Cr powders were selected on the basis of mass percentage, such as 67wt.% Ti, 12wt.% Ni, 10wt.% Al, 5wt.% Nb, 0.75wt.% Mo, 4.5wt.% Si and 0.75wt.% Cr. The uniformly mixed powder was dried and loaded into a graphene grinding tool with an inner diameter of 25 mm for spark plasma sintering. The initially sintered TiNi sample was cut and polished so that the laser marking machine could print microstructures on the flat sample surface. The design inspiration and data of the surface texture came from the scales of arapaima, and the groove width and depth formed by this structure were 0.6 mm. The smaller included angles between the formed rhombic structures were 50°, 60°, 70°, 80°, and 90°, respectively. The S-A composite solid lubricant was composed of SnAgCu with low shear strength and Al2O3 with high load-carrying capacity. Among them, the composition of SnAgCu was selected as 93wt.% Sn, 4wt.% Ag and 3wt.% Cu in order to provide good fluidity of the lubricant during the friction process. The composition of the S-A solid lubricant was designed to be 65wt.% SnAgCu and 35wt.% Al2O3 to ensure that the lubricant would improve the tribological properties of the TiNi alloy. After tribological tests, it was found that S-A/TiNi-70° exhibited the best tribological properties among all samples. The friction coefficient and wear rate of S-A/TiNi-70° were 0.1 and 1.2×10?13 m3/(N.m), respectively. Compared with TiNi, the friction coefficient and wear rate were reduced by 81.8% and 85.5%. During the research process, it is found that the excellent tribological properties of the S-A/TiNi-70° sample depend on the integrity of the S-A solid lubricating film. The more continuous the solid lubricating film formed on the friction surface, the smaller the surface wear. The excellent tribological properties of the S-A/TiNi-70° sample are mainly attributed to the fact that when the surface texture is 70°, the S-A solid lubricant in the texture grooves flows more easily than at other angles. This results in the lubricant in the textured grooves being able to migrate to the friction surface in large quantities to form an S-A solid lubricating film, thereby reducing the direct contact between the friction pair and the substrate.

Key words

S-A/TiNi; tribological properties; surface texture; lubrication behavior; solid lubricant

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XIONG Yahui, LIN Haibo, XIONG Bangying, YANG Kang. Effect of SnAgCu-Al2O3 on TiNi Lubrication Behavior at Different Texture Angles[J]. Surface Technology. 2024, 53(17): 103-111
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