针对巴氏合金与钢体组成的复合材料,提出并推导了结合界面影响因子λ计算公式。采用电弧喷涂技术制备了有无镀锡层工艺处理ZCh Sn Sb11-6/20钢复合材料,研究了材料的力学性能,得到了结合界面影响因子λ关于巴氏合金比重ξ的数学关系式...针对巴氏合金与钢体组成的复合材料,提出并推导了结合界面影响因子λ计算公式。采用电弧喷涂技术制备了有无镀锡层工艺处理ZCh Sn Sb11-6/20钢复合材料,研究了材料的力学性能,得到了结合界面影响因子λ关于巴氏合金比重ξ的数学关系式。结果表明:无镀锡层处理的复合材料结合界面影响因子λ_1随巴氏合金比重ξ的增加而单调递减;而有镀锡层处理的复合材料λ_2与ξ的函数关系存在拐点ξ=0.597,即巴氏合金层存在最佳厚度,使巴氏合金与20钢的结合达到一种平衡,结合性能最佳。经验证,镀锡层工艺处理增强了复合材料的界面结合性能,而且当ξ=0.6时,其界面结合力最大。展开更多
The isothermal and cyclic oxidizing kinetics of Co-40Cr alloy and its yttrium ion-implanted samples were studied at 1000℃ in air by thermal-gravity analysis （TGA）. Scanning electronic microscopy （SEM） was used to...The isothermal and cyclic oxidizing kinetics of Co-40Cr alloy and its yttrium ion-implanted samples were studied at 1000℃ in air by thermal-gravity analysis （TGA）. Scanning electronic microscopy （SEM） was used to examine the Cr203 oxide film＇s morphology after oxidation. Secondary ion mass spectroscopy （SIMS） method was used to examine the binding energy change of chromium caused by yttrium doping. Acoustic emission （AE） method was used in situ to monitor the cracking and spalling of oxide films formed on both samples during oxidizing and subsequent air-cooling stages. It is found that yttrium implantation remarkably reduces the isothermal oxidizing rate of Co-40Cr and improves the anti-cracking and anti-spalling properties of Cr2O3 oxide film. The reasons for the improvements are mainly that implanted yttrium reduces the grain size of Cr2O3 oxide, increases the high temperature plasticity of oxide film, and remarkably reduces the number and size of Cr2O3/Co-40Cr interfacial defects.展开更多
The isothermal oxidation kinetics of a Co-40Cr alloy and its yttrium ion-implanted samples were studied at 1000℃ in air by thermal-gravity analysis （TGA）. Scanning electronic microscopy （SEM） was used to examine ...The isothermal oxidation kinetics of a Co-40Cr alloy and its yttrium ion-implanted samples were studied at 1000℃ in air by thermal-gravity analysis （TGA）. Scanning electronic microscopy （SEM） was used to examine the Cr203 oxide film＇s morphology after oxidation. An acoustic emission （AE） method was used in situ to monitor the cracking and spalling of oxide films formed on samples during oxidation and subsequent aircooling stages. A theoretical model was proposed relating to the film fracture process and was used to analyze the acoustic emission spectrum on time domain and the AE-event number domain. It was found that yttrium implantation remarkably reduced the isothermal oxidation rate of Co-40Cr and improved the anti-cracking and anti-spalling properties of Cr2O3 oxide film. The reasons for the improvement were mainly that the implanted yttrium reduced the grain size of Cr2O3 oxide, increased the high temperature plasticity of oxide film, and remarkably reduced the number and size of Cr203/Co-40Cr interfacial defects.展开更多
文摘针对巴氏合金与钢体组成的复合材料,提出并推导了结合界面影响因子λ计算公式。采用电弧喷涂技术制备了有无镀锡层工艺处理ZCh Sn Sb11-6/20钢复合材料,研究了材料的力学性能,得到了结合界面影响因子λ关于巴氏合金比重ξ的数学关系式。结果表明:无镀锡层处理的复合材料结合界面影响因子λ_1随巴氏合金比重ξ的增加而单调递减;而有镀锡层处理的复合材料λ_2与ξ的函数关系存在拐点ξ=0.597,即巴氏合金层存在最佳厚度,使巴氏合金与20钢的结合达到一种平衡,结合性能最佳。经验证,镀锡层工艺处理增强了复合材料的界面结合性能,而且当ξ=0.6时,其界面结合力最大。
基金the National Natural Science Foundation of China(No.59231011)Natural Science Foundation of Jiangsu Province(No.JK0410184)
文摘The isothermal and cyclic oxidizing kinetics of Co-40Cr alloy and its yttrium ion-implanted samples were studied at 1000℃ in air by thermal-gravity analysis （TGA）. Scanning electronic microscopy （SEM） was used to examine the Cr203 oxide film＇s morphology after oxidation. Secondary ion mass spectroscopy （SIMS） method was used to examine the binding energy change of chromium caused by yttrium doping. Acoustic emission （AE） method was used in situ to monitor the cracking and spalling of oxide films formed on both samples during oxidizing and subsequent air-cooling stages. It is found that yttrium implantation remarkably reduces the isothermal oxidizing rate of Co-40Cr and improves the anti-cracking and anti-spalling properties of Cr2O3 oxide film. The reasons for the improvements are mainly that implanted yttrium reduces the grain size of Cr2O3 oxide, increases the high temperature plasticity of oxide film, and remarkably reduces the number and size of Cr2O3/Co-40Cr interfacial defects.
基金The Natural Science Foundation of Higher EducationInstitutions of Jiangsu Province (No.04KJB510073).
文摘The isothermal oxidation kinetics of a Co-40Cr alloy and its yttrium ion-implanted samples were studied at 1000℃ in air by thermal-gravity analysis （TGA）. Scanning electronic microscopy （SEM） was used to examine the Cr203 oxide film＇s morphology after oxidation. An acoustic emission （AE） method was used in situ to monitor the cracking and spalling of oxide films formed on samples during oxidation and subsequent aircooling stages. A theoretical model was proposed relating to the film fracture process and was used to analyze the acoustic emission spectrum on time domain and the AE-event number domain. It was found that yttrium implantation remarkably reduced the isothermal oxidation rate of Co-40Cr and improved the anti-cracking and anti-spalling properties of Cr2O3 oxide film. The reasons for the improvement were mainly that the implanted yttrium reduced the grain size of Cr2O3 oxide, increased the high temperature plasticity of oxide film, and remarkably reduced the number and size of Cr203/Co-40Cr interfacial defects.
