Al_(x)CoCrFeNi高熵合金黏结剂对Ti(C,N)基金属陶瓷微观结构和高温抗氧化性能的影响

Effect of Al_(x)CoCrFeNi High-Entropy Alloy Binder on Microstructure and High-Temperature Oxidation Resistance of Ti(C,N)-Based Cermets

以Al_(x)CoCrFeNi高熵合金(x=0,0.5,1,物质的量比)作为黏结剂,采用低压烧结法制备Ti(C,N)基金属陶瓷,研究了Al_(x)CoCrFeNi高熵合金黏结剂对金属陶瓷微观结构和高温抗氧化性能的影响。结果表明:所制备的金属陶瓷均主要由面心立方(FCC)结构的Ti(C,N)相和FCC结构的高熵合金黏结相组成,在高温烧结时Al_(0.5)CoCrFeNi和AlCoCrFeNi高熵合金发生了体心立方(BCC)结构相到FCC结构相的转变;金属陶瓷中均形成了典型的芯-环结构,以AlCoCrFeNi高熵合金为黏结剂制备的金属陶瓷中含有较多孔隙;在1000℃氧化6 h后,以CoCrFeNi、Al_(0.5)CoCrFeNi和AlCoCrFeNi高熵合金为黏结剂制备的金属陶瓷的单位面积质量增加量分别为3.58,2.95,2.81 mg·cm^(-2),以Al-CoCrFeNi高熵合金为黏结剂制备的金属陶瓷具有最优的高温抗氧化性能。

Ti(C,N)-based cermets were prepared by low-pressure sintering with Al_(x)CoCrFeNi high-entropy alloy(x=0,0.5,1,molar ratio)as the binder,and the effects of Al_(x)CoCrFeNi high-entropy alloy binder on the microstructure and high-temperature oxidation resistance of cermets were investigated.The results show that the prepared cermets were mainly composed of Ti(C,N)phase with face-centered cubic(FCC)structure and highentropy alloy binder phase with FCC structure,and the transformation from body-centered cubic(BCC)structure phase to FCC structure phase occurred in Al_(0.5)CoCrFeNi and AlCoCrFeNi high-entropy alloys during hightemperature sintering.The cermets all had a typical core-ring structure,and there were more pores in the cermets prepared with AlCoCrFeNi high-entropy alloy binder.After oxidizing at 1000℃for 6 h,the mass gains per unit area of cermets prepared with CoCrFeNi,Al_(0.5)CoCrFeNi,and AlCoCrFeNi high-entropy alloy binders were 3.58,2.95,2.81 mg·cm^(-2),respectively,and the cermets prepared with AlCoCrFeNi high-entropy alloy binder had the best high-temperature oxidation resistance.