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Preparation and Performance Research of Ni-based Self-lubricating Composites

Author: WangAiFang
Tutor: WuYouZhi；ZhangDingJun
School: Lanzhou University of Technology
Course: Materials Science
Keywords: Nickel-based composite materials Solid Lubrication Powder Metallurgy Tribological properties
CLC: TB33
Type: Master's thesis
Year: 2011
Downloads: 78
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Abstract


With the development of aviation, aerospace and military industries, the friction of the material in high temperature conditions, wear and lubrication problems increasingly important, there is an urgent need to develop to have good mechanical and tribological properties of solids in a wide temperature domain (room temperature -800 ℃) lubricating materials. This article was prepared by powder metallurgy Ni-Al, Ni-Cr-based base two different series of self-lubricating composite Ni-Cr based composite mechanical properties and tribological performance of the different contents of graphite and molybdenum disulfide and the sintering temperature, the test load and frequency of the mechanical properties and tribological properties of Ni-Al matrix composites. Experimental results show that: With the improvement of the sintering temperature, the density of Ni-Al matrix composites and increased microhardness and tribological properties of stabilized; friction and wear testing process, as the load increases, the material The friction coefficient decreases as the frequency increases, the coefficient of friction of the material increases. 5wt.% Flake graphite in Ni-Al matrix composites, the hardness of the material is significantly lower, at room temperature and 600 ° C under different degrees of reduction in the coefficient of friction. Ni-Cr matrix 2 and graphite added solid lubricant MoS the With MoS 2 content increased, the microhardness of the material significantly reduced, MoS 2 addition amount increased to 15% from 10% (mass fraction) and the coefficient of friction and wear rate of the material is little changed; The microhardness of the material gradually decreases with increasing the content of graphite, , tended to increase the friction coefficient at 400 ℃ and 800 ℃, when 10% of the graphite dosage, the minimum friction coefficient at room temperature; while adding 5% MoS 2 and 10% graphite composite the coefficient of friction of the material is maintained at 0.48-0.65, suggesting that the graphite and MOS 2 exists between the synergistic effect, but the wear rate is an order of magnitude higher than when a single lubricant is added. The Ni20Cr-graphite composite material, as the content of graphite increases, the denseness of the material and the micro-hardness is gradually decreased; at room temperature and 400 ° C, the coefficient of friction and wear rate of the material is gradually reduced, at 800 ℃, material The reduced coefficient of friction and wear of first elevated; addition of 10% of W, the increased microhardness. Add a graphite in Ni20Cr-10W composite material, as the content of graphite increases, at each temperature, the coefficient of friction of the material is increased at first and then decreased; wear rate at room temperature is gradually increased at 400 ℃ 800 ℃, the first increases and then decreases.

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CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Composite materials
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