基于SPS方法对B_4C/6061Al复合材料的微观组织及磨损行为研究
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摘要
采用化学镀铜的方法对B4C颗粒表面进行改性,以提高颗粒与基体合金之间的界面结合强度。通过等离子放电烧结(SPS)的方法制备颗粒含量为10%~50%的B4C/6061Al复合材料;对制备的复合材料的微观组织形貌、物相组成进行观察分析,并通过高速往复摩擦磨损试验机研究分析其磨损机制。结果表明:B4C颗粒均匀分布于基体合金中,B4C颗粒表面的镀铜层在等离子烧结过程中与基体发生反应,生成第二相Al2Cu,改善了增强体与基体间的结合情况;相对于B4C/6061Al复合材料,采用镀铜处理后的碳化硼制备出的复合材料表现出较低的磨损率,其磨损机制主要为粘着磨损、磨粒磨损和氧化磨损。
Electroless copper plating method was used to modify the surface of B4 C particles,aiming at improving the bonding strength of interface between the particles and the alloy matrix.B4C/6061A1 composites with particle weight fraction around 10%~50% were prepared by plasma discharge sintering(SPS).Microstructure morphology and phase composition of the as-prepared composite materials were observed and analyzed,wear properties and the wear mechanism were investigated by high-speed reciprocating friction and wear tester.The results show that B4 C particles are dispersed evenly among the alloy matrix,the copper layer over the surface of B4 C particles reacts with the matrix during the SPS process,generating a second phase Al2 Cu,which enhances the bonding strength between the reinforcement and the matrix;compared with B4C/6061A1 composites,copper cladded B4 C aluminum composites show lower wear rates.The main wear mechanisms are adhesive wear,abrasive wear and oxidation wear.
Electroless copper plating method was used to modify the surface of B4 C particles,aiming at improving the bonding strength of interface between the particles and the alloy matrix.B4C/6061A1 composites with particle weight fraction around 10%~50% were prepared by plasma discharge sintering(SPS).Microstructure morphology and phase composition of the as-prepared composite materials were observed and analyzed,wear properties and the wear mechanism were investigated by high-speed reciprocating friction and wear tester.The results show that B4 C particles are dispersed evenly among the alloy matrix,the copper layer over the surface of B4 C particles reacts with the matrix during the SPS process,generating a second phase Al2 Cu,which enhances the bonding strength between the reinforcement and the matrix;compared with B4C/6061A1 composites,copper cladded B4 C aluminum composites show lower wear rates.The main wear mechanisms are adhesive wear,abrasive wear and oxidation wear.
引文
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[3]CANAKCI A.Microstructure and abrasive wear behaviour of B4C particle reinforced 2014Al matrix composites[J].Journal of Materials Science,2011,46(8):2805-2813.
[4]高占平,王文先,李宇力,等.B4C颗粒增强铝基复合材料微观形貌和力学行为分析[J].热加工工艺,2012,41(20):89-92.
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[6]SU W,YAO L,YANG F,et al.Electroless plating of copper on surface-modified glass substrate[J].Applied Surface Science,2011,257(18):8067-8071.
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[8]TSENG C C,LIN Y H,SHU Y Y,et al.Synthesis of vinyl acetate/Pd nanocomposites as activator ink for ink-jet printing technology and electroless copper plating[J].Journal of the Taiwan Institute of Chemical Engineers,2011,42(6):989-995.
[9]HU QIYAO,ZHAO HAIDONG,GE JILONG.Microstructure and mechanical properties of(B4C+Al3Ti)/Al hybrid composites fabricated by a two-step stir casting process[J].Materials Science and Engineering,2016,650(5):478-482.
[10]ERIKA F P,VITOR L S,MAURIZIO F.The effect of Al2Cu precipitates on the microstructural Evolution,tensile strength,ductility and work-hardening behavior of the Al-4wt.%Cu alloy processed by equal-channel angular pressing[J].Acta Materialia,2013,61(1):115-125.
[11]MUDRY S,SHTABLAVYI I,RYBICKI J.Molecular dynamic investigation of atomic distribution in molten Al-Al2Cu eutectic alloy[C]∥Journal of Physics:Conference Series.IOP Publishing,2011,289(1):012031.
[12]张星星,余新泉,张友法,等.保温处理对B4C/Al复合材料组织和性能的影响[J].特种铸造及有色合金,2010,(3):260-262.
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[14]MAZAHERY A,SHABANI M O.A comparative study on abrasive wear behavior of semisolid-liquid processed Al-Si matrix reinforced with coated B4C reinforcement[J].Transactions of the Indian Institute of Metals,2012,65(2):145-154.