置换反应 meaning in English
cementation reaction
displacement bleaching
exchange reaction
reaction of replacement
replacement reaction
single displacement reaction
substitution reaction
Examples
- The microstructures hardness grinding performances and mechanical properties of the composites have been analyzed . this paper also discusses the influences of quality ratio and mixture of different oxides to the composites " properties . at the same time , the thermodynamic principles and principles of dynamics have been studied
本文研究了四种原位反应体系： cuo al 、 cuo + sio _ 2 al 、 cuo + tio _ 2 al 、 cuo + sio + _ 2 + tio _ 2 al ，并对由这四种原位反应体系所制备的铝基复合材料的微观组织、布氏硬度、耐磨性能以及拉伸力学性能作了分析与检测，讨论了不同氧化物配比以及不同氧化物的混合对复合材料性能的影响，研究了氧化物与al发生置换反应的热力学与动力学机理。 - A new interface - perturbation model of solid - state displacement reactions ternary system is suggested and the interface - stability criterion is derived in the form of chemical potential if the chemical potential of rate - control - element at frontier of tiny perturbative zone goes up less than 20 . 7 % , linear interface will grow up stablly and form layered structure ; if it goes up more than 20 . 7 % , linear interface is not stable and will form aggregate structure
通过建立界面扰动模型，推导了三元固态置换反应系界面稳定性的化学势梯度判据。结果表明：如果扰动微区前沿速率控制元素的化学势梯度升高小于20 . 7 ，平面界面稳定长大，将形成层状结构；若大于20 . 7 ，平面界面不稳定长大，将形成束集型结构。 - Meanwhile , fundamental principles about electroless tin plating by reducing agent and disproportionation reaction were explained . function of every component in the bath was explained that complexing agent can effectively change the potential of copper and tin , and accelerate the beginning of replacement reaction favorably ; reducing agent can increase the rate of chemical reaction and has the effect of promoting reaction dynamics too ; antioxidant can effectively prevent sn2 + in the bath from being oxidated ; additive agent a can improve the stability of the bath ; additive agent b has such effects as refining and brightening for the tin deposits , and it enlarges the range of brightening section ; additive agent c used as leveling agent can not only make the depostis level off , but also improve the dispersive ability of the bath ; surface - active agent can solve bubble problem which gathered on the surface of the deposits , and improve the surface quality of the deposits and the bath stability
阐述了镀液中各组分的作用：络合剂能有效地改变铜、锡的电位，促使初期的置换反应顺利进行；还原剂能加快化学反应速度，对反应动力学有积极的促进作用；抗氧化剂能有效地防止镀液中sn ~ ( 2 + )的氧化；添加剂a能提高镀液的稳定性，添加剂b对镀层能有细化和光亮作用，扩大了镀层光亮区的范围；添加剂c作为平滑剂，不仅能增强镀层表面的平整性，而且能提高镀液的分散能力；表面活性剂较好地解决了化学镀过程中汽泡在镀件表面聚集的问题，提高了镀层的表面质量和镀液的稳定性。 - The free - phosphine carbene ruthenium complex [ 1 , 3 - bis ( 2 , 6 - dimethylphenyl ) - 2 - tetrahydroimidazol [ ( c5h5n ) 2 ( cl ) 2ru = chph ( 8 ) was prepared by the reaction of [ 1 , 3 - bis ( 2 , 6 - dimethylphenyl ) - 2 - tetrahydroimidazol ] ( pph3 ) ( cl ) 2ru = chph ( 7 ) with pyridine and used as a highly effective catalyst for the cross metathesis of acrylonitrile with allylbenzene
摘要设计了由1 , 3 -二（ 2 , 6 -二甲基苯基） 2 -四氢咪唑基苯亚甲基三苯基膦二氯合钌( 7 )和吡啶反应生成无膦型金属钌卡宾化合物1 , 3 -二（ 2 , 6 -二甲苯基） 2 -四氢咪唑基苯亚甲基2 -吡啶基二氯合钌( 8 ) ， 8作为高效催化剂用于丙烯腈和烯丙基苯的交叉交互置换反应。