作　　者： ; ; ; ; ;

机构地区： 深圳大学材料学院深圳市特种功能材料重点实验室

出　　处： 《中国有色金属学报》 2005年第3期386-390,共5页

摘　　要： 采用NiO、Al和Cr粉末反应热压制备了 Al2O3/NiCrAl复合材料, NiCrAl合金由 NiO还原出来的 Ni与添加的Cr和Al反应形成。制备了不同 Al2O3 含量的 Al2O3/NiCrAl复合材料, 并以 Al2O3 体积分数分别为25%、52.2%和75%的Al2O3/NiCrAl复合材料为过渡层制备了 Y稳定氧化锆(YSZ)到 NiCrAl合金的功能梯度材料。X射线衍射分析、金相观察、硬度测量和热循环冲击实验结果表明: 用该方法制备的复合材料由 Al2O3 陶瓷相和(Ni, Cr, Al)固溶体组成, 而Al2O3 颗粒由NiO与Al原位反应形成, 尺寸细小, 呈弥散分布。该功能梯度材料经从室温到1 000℃空气中10次热循环后未发现有裂纹, 表明该方法制备的材料陶瓷相与合金相有良好的相容性、较高的结合强度、良好的耐高温抗氧化及热循环冲击性能。 The Al_2O_3/NiCrAl composites were fabricated by NiO, Al and Cr powders using reactive hot pressing method. The NiCrAl alloy with good high-temperature properties was formed by the reaction of extra Al, Cr and the Ni reduced from NiO. The Al_2O_3/NiCrAl composites with various Al_2O_3 fraction were successfully fabricated by the proper addition of Ni, Cr, Al or Al_2O_3 powders. A 5-layer functional gradient material of YSZ-NiCrAl was fabricated using the composites as interlayers. The results from XRD analysis, optical microscope observation, hardness measurement and thermal cycling test show that the composites fabricated by this method consist of Al_2O_3 phase and (Ni, Cr, Al) solid solution. The Al_2O_3 grains formed by the in-situ reaction between NiO and Ni are fine and dispersive. No cracking is found in the functional gradient materials after 10 thermal cycles up to 1000℃. The composites and functional gradient material have strong strength, good resistance to wear and thermal shock.

关 键 词： 制备 复合材料 反应热 耐高温 冲击性能 稳定氧化锆 热循环 合金 合金相

领　　域： [金属学及工艺] [金属学及工艺] [化学工程] [化学工程]