纳米结构CoNiCrAlY粉末的制备及其氧化行为

Preparation of Nanostructured CoNiCrAlY Powder and Investigation on Its Oxidation Behavior

利用行星球磨技术制备了纳米结构CoNiCrAlY粉末,采用XRD,SEM等方法对传统结构粉末和纳米结构粉末在1 000℃时的氧化行为进行了研究.结果表明,行星球磨技术能制备出纳米结构粉末,球磨30h后,粉末的平均晶粒尺寸为11.2nm.纳米结构提高了CorANiClY粉末的抗氧化性能,在1 000℃恒温静态氧化100h的过程中,纳米结构粉末只生成α-Al2O3氧化膜,而传统结构粉末除α-Al2O3外还生成了尖晶石氧化物和少量θ-Al2O3.

The nanostructured CoNiCrAlY powder was prepared using the technology of planet mechanical milling.The oxidation behavior of conventional and nanostructured powder at 1000℃ was investigated by the measures of X-ray diffraction and scanning electron microscope.The results show that the technique of planet mechanical milling could be used to prepare nanostructured powder and the average grain size of CoNiCrAlY powder is 11.2nm after milled for 30h.The anti-oxidation capability of CoNiCrAlY nanostructured powder is well improved.During the static oxidation of constant temperature at 1000℃ for 100h,the nanostuructured powder forms only a single αAl2O3 scale,while the conventional powder forms mixed oxide scale composed of αAl2O3 scale,mixed oxide and a small amount of θAl2O3.