On the SEM micrographs of Ti implanted H13 steel, a tree-branch-like structure can be observed. Further investigation with TEM shows that the newly formed composition is a formation of nano-meter FeTi2 phase in Ti imp...On the SEM micrographs of Ti implanted H13 steel, a tree-branch-like structure can be observed. Further investigation with TEM shows that the newly formed composition is a formation of nano-meter FeTi2 phase in Ti implanted layer. The layer with a relatively high corrosion resistance has been formed in Ti implanted H13 steel with this structure. The results of electrochemical measurement show that the corrosion current density decreases obviously with an increase of ion dose. The corrosion current density in Ti implanted steel with a dose of 1.3×1018/cm2 is 8–20 times less than that of Ti implanted steel with a dose of 6×1017/cm2. The corrosion behavior of Ti implanted steel with a dose of 6×1017/cm2 could be further improved as the sample was annealed at 500°C for 20 min and the corrosion current density decreases by 48–80 times compared to that of non-implanted samples. The corrosion trace was not observed on the annealing sample by SEM, after multi-sweep cyclic voltammetry of 40 cycles were performed. This indicates that terrific corrosion resistance can be obtained after annealing for Ti implanted sample.展开更多
采用溶胶凝胶法制备了Sr_2Bi_5Fe Ti_5O_(21)(SBFTi)陶瓷,测试了SBFTi陶瓷室温~500℃范围内的介温谱、交流阻抗以及交流电导率,对其进行了分析。结果表明:SBFTi陶瓷的介电常数比Sr_2Bi_4Ti_5O_(18)高,频率稳定性好,具有弥散型铁电体的特...采用溶胶凝胶法制备了Sr_2Bi_5Fe Ti_5O_(21)(SBFTi)陶瓷,测试了SBFTi陶瓷室温~500℃范围内的介温谱、交流阻抗以及交流电导率,对其进行了分析。结果表明:SBFTi陶瓷的介电常数比Sr_2Bi_4Ti_5O_(18)高,频率稳定性好,具有弥散型铁电体的特征;SBFTi陶瓷的电学结构比较均匀,宏观电阻具有负温度系数特征并主要来源于晶粒的作用;在200~480℃温度范围内,SBFTi陶瓷的电导激活能为0.6 e V,氧空位为SBFTi陶瓷的主要载流子。展开更多
基金Project supported by the National Natural Science Foundation of China (Grant No. 59671051), and 863 National High-Tech Programme of China.
文摘On the SEM micrographs of Ti implanted H13 steel, a tree-branch-like structure can be observed. Further investigation with TEM shows that the newly formed composition is a formation of nano-meter FeTi2 phase in Ti implanted layer. The layer with a relatively high corrosion resistance has been formed in Ti implanted H13 steel with this structure. The results of electrochemical measurement show that the corrosion current density decreases obviously with an increase of ion dose. The corrosion current density in Ti implanted steel with a dose of 1.3×1018/cm2 is 8–20 times less than that of Ti implanted steel with a dose of 6×1017/cm2. The corrosion behavior of Ti implanted steel with a dose of 6×1017/cm2 could be further improved as the sample was annealed at 500°C for 20 min and the corrosion current density decreases by 48–80 times compared to that of non-implanted samples. The corrosion trace was not observed on the annealing sample by SEM, after multi-sweep cyclic voltammetry of 40 cycles were performed. This indicates that terrific corrosion resistance can be obtained after annealing for Ti implanted sample.
文摘采用溶胶凝胶法制备了Sr_2Bi_5Fe Ti_5O_(21)(SBFTi)陶瓷,测试了SBFTi陶瓷室温~500℃范围内的介温谱、交流阻抗以及交流电导率,对其进行了分析。结果表明:SBFTi陶瓷的介电常数比Sr_2Bi_4Ti_5O_(18)高,频率稳定性好,具有弥散型铁电体的特征;SBFTi陶瓷的电学结构比较均匀,宏观电阻具有负温度系数特征并主要来源于晶粒的作用;在200~480℃温度范围内,SBFTi陶瓷的电导激活能为0.6 e V,氧空位为SBFTi陶瓷的主要载流子。
