反应热压法制备Al2O3/NiCrAl复合材料及功能梯度材料

中国有色金属学报, 2005, 15(3): 386-390.

反应热压法制备Al2O3/NiCrAl复合材料及功能梯度材料

李均钦 ^1, , 谷坤明 ^2, , 汤皎宁 ^3, , 谢盛辉 ^4, , 庄应烘 ^5,

1.深圳大学,材料科学与工程系,深圳市特种功能材料重点实验室,深圳,518060

2.深圳大学,材料科学与工程系,深圳市特种功能材料重点实验室,深圳,518060

3.深圳大学,材料科学与工程系,深圳市特种功能材料重点实验室,深圳,518060

4.深圳大学,材料科学与工程系,深圳市特种功能材料重点实验室,深圳,518060

5.广西大学,材料研究所,南宁,530004

基金项目: 广东省深圳市科技三项费资助项目(200322)

关键词：反应热压法 , Al2O3/NiCrAl复合材料 , 功能梯度材料

Al2O3/NiCrAl composites and functional gradient materials fabricated by reactive hot pressing

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.

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