内燃机用镍基合金表面Zr改性(Pt,Ni)Al涂层的性能
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摘要
为了提高内燃机用镍基合金表面(Pt,Ni) Al涂层的抗氧化性能,对镍基单晶高温合金DD6表面Pt-Zr镀层实施气相渗铝得到Zr改性(Pt,Ni) Al涂层,对比分析了此涂层与常规(Pt,Ni) Al涂层的热腐蚀测试结果。结果表明:涂层改性后Zr元素基本固溶于中间层以及外层(Pt,Ni) Al组织相内,未改性和改性后涂层都是由PtAl2与Ni Al共同构成,涂层内的PtAl2相都以弥散态的形式存在于(Pt,Ni) Al相中;经过100 h热腐蚀测试后Zr改性(Pt,Ni) Al涂层比未改性涂层的增重程度更低;涂层进行60 h热腐蚀形成的表层中包含了Al2O3与Ni Al,并且涂层内PtAl2相含量减少;经Zr改性后的(Pt,Ni) Al涂层发生了少量内氧化,实际腐蚀深度减小。
In order to improve the oxidation resistance of( Pt,Ni) Al coating on the surface of nickel-based alloy for internal combustion engine,the Zr modified( Pt,Ni) Al coating was obtained by gas phase aluminizing on the surface of Ni-based single crystal high temperature alloy DD6 with Pt-Zr coating,and thermal corrosion tests were carried out to compare and analyze the as-prepared coating and conventional( Pt,Ni) Al coating. Results showed that after coating modification,Zr element basic solid was in the middle layer and outer layer( Pt,Ni) Al phase. The coatings with and without modification were composed of PtAl2 and Ni Al,and the PtAl2 phase existed as dispersion state in( Pt,Ni) Al phase. After thermal corrosion test for 100 h,Zr modified( Pt,Ni) Al coating had lower weight gain than conventional( Pt,Ni) Al coating. Besides,the surface layer of the coating after thermal corrosion treatment for 60 h contained Al2 O3 and Ni Al phase,and the content of PtAl2 phase in the coating decreased. In general,the( Pt,Ni) Al coating modified by Zr underwent a small amount of internal oxidation,and the actual corrosion depth decreased.
In order to improve the oxidation resistance of( Pt,Ni) Al coating on the surface of nickel-based alloy for internal combustion engine,the Zr modified( Pt,Ni) Al coating was obtained by gas phase aluminizing on the surface of Ni-based single crystal high temperature alloy DD6 with Pt-Zr coating,and thermal corrosion tests were carried out to compare and analyze the as-prepared coating and conventional( Pt,Ni) Al coating. Results showed that after coating modification,Zr element basic solid was in the middle layer and outer layer( Pt,Ni) Al phase. The coatings with and without modification were composed of PtAl2 and Ni Al,and the PtAl2 phase existed as dispersion state in( Pt,Ni) Al phase. After thermal corrosion test for 100 h,Zr modified( Pt,Ni) Al coating had lower weight gain than conventional( Pt,Ni) Al coating. Besides,the surface layer of the coating after thermal corrosion treatment for 60 h contained Al2 O3 and Ni Al phase,and the content of PtAl2 phase in the coating decreased. In general,the( Pt,Ni) Al coating modified by Zr underwent a small amount of internal oxidation,and the actual corrosion depth decreased.
引文
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[3]石皋莲,吴少华,任佳. Al(Ni)含量对钛合金激光熔覆Al Ni MoSi复合涂层摩擦学性能的影响[J].材料保护,2018,51(3):7-10.
[4]张伟刚,赵雪妮,刘军鹏,等. CF表面改性及PVD法制备Al涂层的研究[J].陕西科技大学学报,2018,36(6):141-146.
[5]马壮,李玲,董世知,等.氩弧熔覆Fe-Al金属间化合物复合涂层的组织与性能[J].材料保护,2017,50(10):9-12.
[6]李丹,宋珏蓉,曾明,等.镍基单晶高温合金蠕变行为研究进展[J].热加工工艺,2018,47(2):41-44.
[7]姚培培,付超,操光辉. Pt+Hf改性的γ-Ni+γ'-Ni3Al涂层结构及其抗氧化性能研究[J].稀有金属材料与工程,2014,43(1):224-228.
[8]朱鹏超,张利军,邵博,等.离子喷涂镍基涂层表面形貌的研究[J].热加工工艺,2016,45(10):166-168.
[9]梁永纯,赵书彦,聂铭,等.纳米Zr粒子改性环氧涂层的耐腐蚀性能[J].材料研究学报,2013,27(2):189-196.
[10]余森,于振涛,韩建业,等.表面Ti O2/HA改性Ti-5Zr-6Mo-15Nb的组织相容性及成骨活性[J].金属热处理,2010,35(9):31-36.
[11]施国梅,张尊礼,史凤岭,等.铂改性铝化物涂层的研究进展[J].热加工工艺,2012,41(10):159-161.
[12]骆瑞雪,李争显,潘晓龙.钛合金表面熔烧铝化物涂层抗氧化性[J].热加工工艺,2011,40(12):124-126.