材料期刊网

采用微弧氧化技术在TiCp/Ti6Al4V复合材料表面制备陶瓷膜.在NaAlO2和NaH2PO2两种溶液体系中通过添加不同添加剂NaOH、C10H12CaNa2N2O8·4H2O和Na2SiO3,研究电解液组分对陶瓷膜组织、耐蚀性和耐磨性的影响.结果表明:在NaH2PO2电解液体系中生成的膜层由金红石型和锐钛矿型TiO2相组成,而在NaAlO2体系中除了生成TiO2外,还生成了Al2TiO5和γ-Al2O3.添加NaOH可以加快微弧氧化反应速率,添加NaAlO2和Na2SiO3有利于提高膜层的硬度,NaH2PO2溶液体系中形成的膜层厚度是NaAlO2溶液体系的2～3倍.在NaAlO2和NaH2PO2电解液体系中生成的膜层,其耐腐蚀性能排序均为:Na2SiO3＞C10H12CaNa2N2O8·4H2O＞NaOH.在NaAlO2电解液体系中生成的膜层的耐磨性能排序为:Na2SiO3＞NaOH＞C10H12CaNa2N2O8·4H2O,而在NaH2PO2电解液体系中生成的膜层的耐磨性能排序为:Na2SiO3＞C10H12CaNa2N2O8·4H2O＞NaOH.TiCp/Ti6Al4V复合材料经过微弧氧化处理后,耐磨性和耐蚀性均优于基体,在NaH2PO2+Na2SiO3电解液中生成的微弧氧化膜的耐蚀性最好,耐磨性也较好,其腐蚀电流密度较钛基复合材料基体降低约2个数量级,因此综合性能最好.

The ceramic coatings were prepared by micro-arc oxidation (MAO) on the TiCp/Ti6Al4V composites.The effects of NaOH,C10H12CaNa2N2O8·4H2O and Na2SiO3 additives in NaAlO2 and NaH2PO2 solutions on the microstructure,corrosion resistance and wear resistance of the ceramic coatings were investigated,respectively.The results showed that coatings prepared in NaH2PO2 solution were composed of rutile and anatase TiO2,while coatings prepared in NaAlO2 solution consisted of Al2TiO5,γ-Al2O3,rutile and anatase TiO2.The NaOH addition could increase reaction rate of the micro-arc oxidtion,and the hardness of the MAO coatings could be enhanced by the addition of NaAlO2 and Na2SiO3.The thickness of the coatings formed in NaH2PO2 solution is 2-3 times thicker than that of the coating formed in NaAlO2 solution.The corrosion resistance of the coatings formed both in NaAlO2 and NaH2PO2 solutions,ranked from additives∶ Na2SiO3＞C10H12CaNa2N2O8·4H2O＞NaOH.Wear resistance of the coatings formed in the NaAlO2 solution ranked from the additives∶ Na2SiO3＞NaOH＞C10H12CaNa2N2O8·4H2O,while the wear resistance formed by NaH2PO2 solution ranked from additives∶ Na2SiO3＞C10H12CaNa2N2O8·4H2O＞NaOH.After micro-arc oxidation,all of the corrosion resistant and wear resistance of the MAO coatings were higher than those of the untreated TiCp /Ti6Al4Vcomposites.The mciro-arc oxidation coatings formed in NaH2PO2+Na2SiO3 solution showed the best corrosion resistance (about two orders of magnitude higher than that of the substrate) and better wear resistance.