摘要
通过研究时效过程中电阻率的变化规律 ,分析了Cu 3.2Ni 0 .75Si 0 .30Zn合金的时效析出特性及其动力学过程。结果表明 :低温时效时扩散作用是合金析出过程的主要控制因素 ,时效早期通过调幅分解形成溶质原子的富集区 ,然后在溶质富集区发生失稳有序化 ,最后生成δ Ni2 Si相 ;高温时效时相变驱动力成为主要控制因素 ,由于生成δ Ni2 Si相的驱动力较大 ,所以直接析出δ Ni2 Si相。结合透射电镜研究了合金时效过程中显微组织的变化 ,并得出了合金的时间—温度—转变曲线 (即TTT曲线 )。
Titanium based RuO_2-CeO_2-SnO_2 coating anodes with various CeO_2 content were prepared by thermal decomposition. The electrocatalytic activity of coating anodes was studied by cyclic voltammetry test and alternation current impedance test. The morphology of coating anode was studied by scanning electron microscopy (SEM). Results show that the sintering temperature influences electrocatalytic properties of coating anode, the electrocatalytic properties of coating anode are improved by doping with CeO_2, and CeO_2 content of 0.4(mole fraction) is adaptive. The reason of improving the electrocatalytic proprties is that CeO_2 composition increases the activity surface area of coating anode.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2003年第3期717-721,共5页
The Chinese Journal of Nonferrous Metals
基金
河南省重大科技攻关项目 (0 12 2 0 2 130 0 )
