TNM钛铝合金高温抗氧化行为研究  

Research on high-temperature oxidation resistance behavior of TNM titanium aluminum alloy

作　　者：邸士雄 欧白羽[2] 李维 赵春玲 聂建豪 油如月 季显坤 赵宇 DI Shixiong;OU Baiyu;LI Wei;ZHAO Chunling;NIE Jianhao;YOU Ruyue;JI Xiankun;ZHAO Yu(AECC HuNan Aviation Powerplant Research Institute,Zhuzhou 412002,China;Army Aviation Institute,Beijing 101121,China)

机构地区：[1]中国航发湖南动力机械研究所,株洲412002 [2]陆军航空兵学院,北京101121

出　　处：《工程科学学报》2024年第10期1826-1833,共8页Chinese Journal of Engineering

摘　　要：TNM(Ti–43Al–4Nb–1Mo–0.1B)钛铝合金具有较低的密度、优异的高温力学性能和较好的高温变形能力,其长期服役温度可达750℃左右,是备受瞩目的新一代航空发动机低压涡轮叶片用材料.选取热暴露温度时间不同的两个热暴露条件对TNM合金在空气中进行氧化实验,采用扫描电子显微镜、能谱仪及X射线光电子能谱分析仪对试样的表面形貌、氧化物组成进行分析,系统研究了TNM合金在不同温度、不同时间热暴露条件下的氧化规律.结果表明,在700℃和760℃下,TNM合金抗氧化级别分别为完全抗氧化和抗氧化等级.700℃下,TNM合金在氧化初期先生成TiO_(2),随后Al_(2)O_(3)逐渐增加,直至覆盖整个样品,在氧化进行200 h时,表面生成的氧化物主要为Al_(2)O_(3),含有少量的MoO_(2)、MoO_(3),能保持较好的抗氧化性;760℃条件下,合金在氧化初期即形成不稳定的Al的氧化物与Ti的氧化物,表面生成的氧化物主要为TiO_(2)和少量的MoO_(2)、MoO_(3)与MoO_(x)的氧化物.TNM(Ti–43Al–4Nb–1Mo–0.1B)titanium aluminum alloy has low density,excellent mechanical properties at high temperatures,and good deformation ability at high temperatures and is applied as a new-generation aeroengine low-pressure turbine blade material.Its long-term service temperature can reach approximately 750℃.In this paper,a TiAl alloy with a nominal composition of Ti–43Al–4Nb–1Mo–0.1B(atom fraction,%)was prepared using the vacuum induction levitation melting method.Oxygenation samples with dimensions of 10 mm×10 mm×5 mm were fabricated using electrical discharge wire cutting.After sandpaper polishing,the surface of the samples was selected for oxidation testing in air at two different temperatures of 700℃and 760℃for nine oxidation time points of 1–200 h using a muffle furnace.A systematic investigation was performed on the oxidation behavior of the TNM alloy at different temperatures and time exposures by characterizing its surface morphology and surface and cross-sectional oxide composition using scanning electron microscopy,energy dispersive spectroscopy,and X-ray photoelectron spectroscopy.Results revealed that at 700℃and 760℃,the TNM alloy displays complete oxidation resistance and antioxidation levels and the weight gain rate of the sample at 760℃is 0.1956 g·m^(−2)·h^(−1),which is much higher than that at 700℃.At 700℃,the TNM alloy initially forms TiO_(2) during the early stage of oxidation,followed by a gradual increase in Al_(2)O_(3) until it covers the entire sample.After 200 h of oxidation,the predominant surface oxides on the alloy were Al_(2)O_(3) with small amounts of MoO_(2) and MoO_(3),which exhibited excellent oxidation resistance.At 760℃,the alloy forms unstable oxide compounds of Al and Ti during the initial stage of oxidation,and the growth rate of TiO_(2) is faster,destroying the continuous and dense Al_(2)O_(3) layer on the surface and making the matrix more easily oxidized.After 200 h of oxidation,the predominant oxide on the surface is mainly Ti

关 键 词：钛铝合金 高温氧化 X射线光电子能谱 氧化行为 氧化物 

分 类 号：TG142.71[一般工业技术—材料科学与工程]