干摩擦与边界润滑下SiC/Al复合材料的摩擦磨损性能
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摘要
采用机械合金化和热压烧结相结合的方法分别制备了w(Si C)分别为3%、5%、7%的铝基Si C/Al复合材料。研究了Si C/Al复合材料的显微组织和硬度。结果表明:当w(Si C)=5%时,复合材料显微组织最为细小、均匀。随着Si C含量的升高,硬度呈现先增加后减小趋势,且当w(Si C)=5%时,硬度达到最大值57. 75 HB。不同Si C含量铝基复合材料在室温干摩擦和边界润滑两种工况中的摩擦磨损性能表明:随着Si C含量的升高,复合材料磨损率和摩擦因数均呈先减少后增加的趋势,w(Si C)=5%的复合材料的磨损率和摩擦因数均最小,且边界润滑工况中材料磨损率和摩擦因数均小于干摩擦工况的;观察不同Si C含量的Si C/Al复合材料的磨损面及其磨屑形貌可以看出,干摩擦工况中,材料主要磨损机制为磨粒磨损和粘着磨损,而在边界润滑工况中,其主要磨损机制为磨粒磨损和轻微氧化磨损。
Aluminum matrix SiC/Al composites with w( SiC) = 3%,5% and 7% were prepared by mechanical alloying with subsequent hot-press sintering. The effect of SiC content on the microstructure and hardness of the material was studied. The results showed that when w( SiC) = 5%,the microstructure was the finest and most uniform. With the increase of SiC content,the hardness first increased and then decreased. When w( SiC) = 5%,the hardness reached the maximum 57. 75 HB. The friction and wear behavior of composites with different SiC contents were also studied at room temperature under dry and boundary lubrication conditions. The results showed that both of its wear rate and friction coefficient decreased first and then increased under the two working conditions with SiC content increasing. When w( SiC) = 5%,both the wear rate and friction coefficient were the smallest,and the wear rate and friction coefficient of the boundary lubrication conditions were lower than those at room temperature under dry friction conditions. According to the study of wear sur-face and wear debris of SiC/Al composites,the conclusion were summarized as following:under the room temperature dry friction condition,the main wear mechanism was abrasive wear and adhesive wear,while under the boundary lubrication,the main wear mechanism was abrasive wear with slight oxidation wear.
Aluminum matrix SiC/Al composites with w( SiC) = 3%,5% and 7% were prepared by mechanical alloying with subsequent hot-press sintering. The effect of SiC content on the microstructure and hardness of the material was studied. The results showed that when w( SiC) = 5%,the microstructure was the finest and most uniform. With the increase of SiC content,the hardness first increased and then decreased. When w( SiC) = 5%,the hardness reached the maximum 57. 75 HB. The friction and wear behavior of composites with different SiC contents were also studied at room temperature under dry and boundary lubrication conditions. The results showed that both of its wear rate and friction coefficient decreased first and then increased under the two working conditions with SiC content increasing. When w( SiC) = 5%,both the wear rate and friction coefficient were the smallest,and the wear rate and friction coefficient of the boundary lubrication conditions were lower than those at room temperature under dry friction conditions. According to the study of wear sur-face and wear debris of SiC/Al composites,the conclusion were summarized as following:under the room temperature dry friction condition,the main wear mechanism was abrasive wear and adhesive wear,while under the boundary lubrication,the main wear mechanism was abrasive wear with slight oxidation wear.
引文
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[15]ASTM G181-11,Standard Test Method for Conducting Friction Test of Piston Ring and Cylinder Materials Under Lubricated Conditions[S].
[2]GAO Jifeng,SUO Jinping.Preparation and characterization of the electrodeposited Cr-Al2O3/SiC composite coating[J].Applied Surface Science,2011,257(22):9643-9648.
[3]邹家生,赵其章,陈铮.SiC颗粒增强铝基复合材料钎焊技术研究[J].轻合金加工技术,2004(3):48-52.
[4]BAURIRanjit,M.K.Surappa.Processing and properties of Al-Li-SiCp composites[J].Science and Technology of Advanced Materials,2007,8(6):494-502.
[5]JIMURATaroTsu.(日).机车车辆铝合金复合材料制动盘的开发[J].国外机车车辆工艺,1996(4):9-13.
[6]PARKA B G,CROSKYA G,HELLIER A K.Fracture toughness of microsphere Al2O3-Al particulate metal matrix composites[J].Composites:Part B,2008,39(7-8):1270-1279.
[7]肖荣林,郑化安,付东升,等.铝基复合材料的制备及应用进展[J].铸造技术,2015(5):1118-1121.
[8]汤佩钊.复合材料及其应用技术[M].重庆:重庆大学出版社,1998.
[9]宋国芳,杜永平,韩建民.SiC颗粒增强铝基复合材料的摩擦磨损机制研究[J].润滑与密封,2006(5):127-129.
[10]覃群,华建杰.粉末冶金制备SiCp增强Al基复合材料及其性能[J].特种铸造及有色合金,2017(4):411-414.
[11]王晓虹,冯培忠,强颖怀.SiCp颗粒增强铝基复合材料的制备与应用的研究进展[J].轻合金加工技术,2002(12):9-11.
[12]王治国.纳米SiC增强铝基复合材料的粉末冶金制备及其力学性能[D].吉林:吉林大学,2016.
[13]卢棋,何国球,杨洋,等.Si C颗粒增强铝基复合材料的摩擦磨损性能研究[J].金属功能材料,2015,22(2):41-47.
[14]李翊.SiC颗粒增强铝基复合材料的摩擦磨损性能现状[D].长沙:湖南大学,2005.
[15]ASTM G181-11,Standard Test Method for Conducting Friction Test of Piston Ring and Cylinder Materials Under Lubricated Conditions[S].