Thermal stability of nanostructured NiCrC coating prepared by HVAF spraying of cryomilled powders

稀有金属（英文版）, 2008, 27(4): 418-424.

^1, , ^2, , ^3, , ^4,

1.School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China

2.State Key laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China

3.State Key laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China

4.State Key laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China

基金项目: 国家高技术研究发展计划(863计划)(2002AA331080)

Thermal stability of nanostructured NiCrC coating prepared by HVAF spraying of cryomilled powders

CUI Hua ^1, , TAO Kai ^2, , ZHOU Xianglin ^3, , ZHANG Jishan ^4,

1.School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China

2.State Key laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China

3.State Key laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China

4.State Key laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China

Keywords： nanostructure coatings

Thermal stability of nanostructured NiCrC coating prepared by high velocity air-fuel (HVAF) spraying of cryomilled feedstock powders was investigated.Transmission electron microscopy (TEM),differential scanning calorimetry (DSC),and X-ray diffraction (XRD) were utilized for characteristic analysis.Recrystallization and normal grain growth occur when isothermal treatment is performed at 923 K (0.55 TM) for up to 100 h,and the average grain size increases from initial 41 nm for as-deposited state to around 100 nm for nearly equilibrium state.Isochronal treatment at 823 K and 1023 K was also conducted for comparison.Accordingly,for 0.49 to 0.61 T/TM,the time exponent n deduced from D1/n - D1/0/n = kt increases from 0.15 to 0.30.The observed high thermal stability is attributed primarily to a Zener pinning mechanism arising from the fine Cr2O3 dispersions and the solute drag effect as well.

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Thermal stability of nanostructured NiCrC coating prepared by HVAF spraying of cryomilled powders

参考文献