磷酸盐对钛合金MAO陶瓷涂层抗高温氧化性能的影响
|
摘要
针对钛合金在高温下表面易氧化的问题,采用MAO技术在TC4钛合金表面制备陶瓷涂层,在不同磷酸盐质量浓度下,通过XRD、SEM和蔡司光学显微镜分析陶瓷涂层的相组成、表面形貌和截面形貌。利用箱式电阻炉进行700℃高温氧化实验,研究陶瓷涂层的抗高温氧化性能,并重点探讨其抗高温氧化机理。结果表明:陶瓷涂层由Ti O2相和Ti相组成,不同磷酸盐质量浓度会改变相的衍射峰值大小;陶瓷涂层表面有融状物凸起并呈多孔结构;随着磷酸盐质量浓度的增加,陶瓷涂层的厚度也逐渐增加;当Na3PO4质量浓度为15 g/L时,陶瓷涂层的抗高温氧化性最好,其氧化增重较基体试样减少50%。该研究证实了微弧氧化技术可显著改善钛合金的抗高温氧化性能。
This paper is aimed at addressing surface oxidation vulnerability occurring in titanium alloy at a high temperature. The research involves preparing the ceramic coating on the surface of TC4 titanium alloy using MAO technique; analyzing phase composition,surface morphology and cross-section of ceramic coatings using XRD,SEM and Zeiss optical microscopy; performing the high temperature oxidation test of 700 ℃ by applying box-type resistance furnace and thereby studying the high temperature oxidation resistance of ceramic coatings and identifying the mechanism behind the high temperature oxidation resistance. The results show that the ceramic coating consists of Ti O2 phase and Ti phase; different phosphate mass concentration triggers a change in the peak value of the phase; the surface of the ceramic coating has some molten substance and some tiny holes; along with an increase in phosphate mass concentration comes an increase in the ceramic thickness of the coating; and given the concentration of Na3 PO4 of 15 g/L,the ceramic coating exhibits the best high temperature oxidation resistance,and shows a 50% reduction in oxidation weight gain compared with the matrix sample. This study validates that micro-arc oxidation technology could provide a significant improvement in the high temperature oxidation resistance of titanium alloys.
This paper is aimed at addressing surface oxidation vulnerability occurring in titanium alloy at a high temperature. The research involves preparing the ceramic coating on the surface of TC4 titanium alloy using MAO technique; analyzing phase composition,surface morphology and cross-section of ceramic coatings using XRD,SEM and Zeiss optical microscopy; performing the high temperature oxidation test of 700 ℃ by applying box-type resistance furnace and thereby studying the high temperature oxidation resistance of ceramic coatings and identifying the mechanism behind the high temperature oxidation resistance. The results show that the ceramic coating consists of Ti O2 phase and Ti phase; different phosphate mass concentration triggers a change in the peak value of the phase; the surface of the ceramic coating has some molten substance and some tiny holes; along with an increase in phosphate mass concentration comes an increase in the ceramic thickness of the coating; and given the concentration of Na3 PO4 of 15 g/L,the ceramic coating exhibits the best high temperature oxidation resistance,and shows a 50% reduction in oxidation weight gain compared with the matrix sample. This study validates that micro-arc oxidation technology could provide a significant improvement in the high temperature oxidation resistance of titanium alloys.
引文
[1]牛宗伟,李明哲.钛合金微弧氧化技术的研究进展[J].电镀与环保,2015,35(1):1-4.
[2]吴向清,谢发勤.钛合金表面微弧氧化技术的研究[J].材料导报,2005(6):85-87.
[3]杨文瀑.钛合金抗高温氧化涂层的制备及性能研究[D].广州:广东工业大学,2016:2-4.
[4]陈泉志,唐仕光,李少波,等.TC4钛合金微弧氧化膜的高温曝露行为[J].材料保护,2016,49(8):24-25.
[5]汪彬彬.6061铝合金微弧氧化膜的制备及其耐腐蚀性研究[D].济南:山东大学,2018:6-8.
[6]Yerokhin A L,Lyubimov V V,Ashitkov R V.Phase formation in ceramic coatings during plasma electrolytic oxidation of aluminium alloys[J].Ceramics International,1998,24(1):1-6.
[7]王伟.TC4钛合金微弧氧化/Zr O2、BN复合膜摩擦磨损性能研究[D].南昌:南昌航空大学,2015:2-4.
[8]李兆峰,张建欣,蒋鹏,等.钛合金微弧氧化膜的性能探讨[J].材料保护,2010,43(9):66-67.
[9]解念锁,武立志.微弧氧化对TC4钛合金高温抗氧化性能的影响[J].材料保护及表面工程,2012,33(4):416-417.
[10]姚忠平,姜兆华,郝国栋,等.高温氧化对钛合金微弧氧化陶瓷膜组成与结构的影响[J].材料科学与工艺,2008(1):23-25,30.
[2]吴向清,谢发勤.钛合金表面微弧氧化技术的研究[J].材料导报,2005(6):85-87.
[3]杨文瀑.钛合金抗高温氧化涂层的制备及性能研究[D].广州:广东工业大学,2016:2-4.
[4]陈泉志,唐仕光,李少波,等.TC4钛合金微弧氧化膜的高温曝露行为[J].材料保护,2016,49(8):24-25.
[5]汪彬彬.6061铝合金微弧氧化膜的制备及其耐腐蚀性研究[D].济南:山东大学,2018:6-8.
[6]Yerokhin A L,Lyubimov V V,Ashitkov R V.Phase formation in ceramic coatings during plasma electrolytic oxidation of aluminium alloys[J].Ceramics International,1998,24(1):1-6.
[7]王伟.TC4钛合金微弧氧化/Zr O2、BN复合膜摩擦磨损性能研究[D].南昌:南昌航空大学,2015:2-4.
[8]李兆峰,张建欣,蒋鹏,等.钛合金微弧氧化膜的性能探讨[J].材料保护,2010,43(9):66-67.
[9]解念锁,武立志.微弧氧化对TC4钛合金高温抗氧化性能的影响[J].材料保护及表面工程,2012,33(4):416-417.
[10]姚忠平,姜兆华,郝国栋,等.高温氧化对钛合金微弧氧化陶瓷膜组成与结构的影响[J].材料科学与工艺,2008(1):23-25,30.