不同粘结底层对镍基单晶合金性能影响研究  

Study on the Effect of Different Bonding Interlayers on the Performance of Nickel-Based Single Crystal Alloys

作　　者：高栋 刘燚栋 张国栋 黄爱华 GAO Dong;LIU Yidong;ZHANG Guodong;HUANG Aihua(AECC Commercial Aircraft Engine Co.,Ltd.,Shanghai 200241,China)

机构地区：[1]中国航发商用航空发动机有限责任公司,上海200241

出　　处：《材料保护》2025年第4期142-147,共6页Materials Protection

摘　　要：为解决航空发动机高压涡轮叶片用DD6镍基单晶合金材料高温氧化及腐蚀问题,分别采用真空电弧镀和镀铂渗铝工艺制备NiCoCrAlY和PtAl抗氧化涂层,比较研究了2种涂层对基体材料高温氧化、燃气热腐蚀及力学性能的影响。结果表明:与传统NiCoCrAlY涂层相比,PtAl涂层具有更加优异的高温抗氧化及抗燃气热腐蚀性能,其主要原因在于Pt的引入使得高温下Al快速氧化并形成连续且致密的保护性α-Al_(2)O_(3)膜层;沉积NiCoCrAlY涂层试样在760℃下的拉伸强度略有提高,而在相同测试条件下PtAl涂层试样的拉伸强度提升幅度显著低于沉积NiCoCrAlY涂层试样;沉积2种涂层后,材料的屈服强度均显著低于无涂层试样,且PtAl涂层试样的屈服强度下降尤为显著,这与Pt改性铝化物相对较高的韧脆转变温度有关;在980℃/250 MPa条件下,2种涂层均有利于延长材料的持久寿命,且NiCoCrAlY涂层的延长效果尤为显著,保护性氧化物的形成抑制了裂纹的萌生和扩展是材料高温持久寿命延长的主要原因。In order to address the high-temperature oxidation and corrosion issues of DD6 nickel-based single crystal alloy used in aviation engine high-pressure turbine blades,NiCoCrAlY and PtAl oxidation-resistant coatings were prepared using vacuum arc plating and platinum-aluminizing processes,respectively.The effects of these two coatings on the high-temperature oxidation,gas hot corrosion,and mechanical properties of the base material were comparatively studied.Results showed that,compared with the traditional NiCoCrAlY coating,the PtAl coating exhibited superior high-temperature oxidation resistance and gas hot corrosion resistance.This was primarily due to the introduction of Pt,which promoted the rapid oxidation of Al at high temperatures,forming a continuous and dense protectiveα-Al_(2)O_(3) layer.The tensile strength of the NiCoCrAlY coating specimens at 760℃showed a slight increase,whereas the tensile strength increase for the PtAl coating specimens under the same testing conditions was significantly lower than that of the NiCoCrAlY coating specimens.After deposition of both coatings,the yield strength of the materials was significantly lower than that of the uncoated specimens,with the yield strength decrease in the PtAl coating specimens being particularly pronounced.This was related to the relatively high ductile-brittle transition temperature of the Pt-modified aluminides.Under the conditions of 980℃/250 MPa,both coatings were beneficial in extending the material’s service life,with the NiCoCrAlY coating showing a particularly significant effect.The formation of protective oxides inhibited crack initiation and propagation,which was the primary reason for the extension of the material’s high-temperature service life.

关 键 词：抗氧化涂层 镀铂渗铝 真空电弧镀 氧化 拉伸 

分 类 号：TG174.4[金属学及工艺—金属表面处理]