Development of the Al-SiC composite filler material for deposition of wear resistant coatings
Wear of sliding joints under the friction is the main reason of failing up to 80% of machinery. The surface layer is subjected to intense physicochemical influence during the work. Therefore the production of the wear resistant surface layers is urgent task during fabrication and repair of machine elements. One of this task solu tion is using of composite materials (CM) based on alu minium alloys reinforced with high-strength silicon car bide (SiC) particles as wear resistant,antifriction coat ings on the machine elements working in extreme condi tions.Such CMs show a combination of superior physi cal and technological properties and also they have low friction coefficient and improved wear resistance. Composite coatings can be deposited by argon-arc welding plasma spraying laser melting of com posite powder mixtures. The argon-arc welding is the most universal method among them.It allows to produce the strong bonding between deposited coating and substrate material,and the lack of porosity.But the filler material is required for deposition of composite coatings and reconstruction of worn-out parts by argon arc welding. The composite filler rods have to provide the saving of reinforcing particles and their uniform dis tribution in the deposited coating. It is well-known the composite filler material can be a powdered electrode or a cast rod. The fabrication of the filler cast rod is preferentially because cast technology provides the lack of contamination on particle/matrix interface. The re sults of choice of compositions for filler rod,regimes for deposition of composite coatings by argon-arc welding and characterizing of their tribotechnical properties in dry sliding wear conditions are presented in this article. The composite filler rods based on aluminium alloys Al-12Si and Al-12Si-2Cu-lMg-lNi reinforced with SiC par ticles were fabricated. These matrix materials are high strength aluminium alloys.Particulate reinforced com posite materials based on these alloys have the high tri botechnical properties. Alloying of these alloys by silicon (up to 13%) limits the interface interaction be tween matrix and SiC particles in welding pool and im proves composite melt flowing required for qualitative weld form. The filler rods were prepared ac cording to casting technology.Special attention was at tended to the choice of reinforcement volume fraction leading to qualitative weld form.
Mikheev R.S. Chemyshova T.A.
A.A.Baikov Institute of Metallurgy and Material Science of Russian Academy of Sciences,Russia,Moscow,Leninsky prospect,49
国际会议
The 10th China-Russia System on Advanced Materials and Technologies(第十届中俄新材料新工艺研讨会)
浙江嘉兴
英文
879-882
2009-10-20（万方平台首次上网日期，不代表论文的发表时间）