Copper - nanosized tibi composites were prepared by in - situ process . the microstructure , mechanical and electrical properties , and dry sliding wear behavior and electric sliding wear of cu - nanosized tib _ 2 in - situ composites was investigated ; mostly task as follows : the thermodynamic data for the reactions between b and ti in the molten liquid of copper were analyzed , the copper matrix composites reinforced by in - situ tibi nanoparticles were prepared by reactions of 8263 , carbon and titanium in copper - titanium melt , and copper - titanium , copper - boron in alloy melt , respectively , which controlled the reaction temperature , reaction time and solidification process . the rnicrostructure and mechanical and electrical properties of the in - situ composites were investigated by using optics microscope , tem and xrd 本文采用原位反应法制备了cu -纳米tib _ 2原位复合材料，在此基础上分析了原位复合材料的微结构，进行了干滑动摩擦磨损和电接触滑动磨损实验，完成的主要工作如下：从热力学的角度出发，分析了陶瓷tib _ 2颗粒在铜基体中原位生成的热力学条件，并用电解铜、工业纯钛、 b _ 2o _ 3 、 c (还原剂)以及cu - ti 、 cu - b等合金为原料，通过控制适当的反应温度、反应时间和快速凝固等工艺手段，制备了cu -纳米tib2原位复合材料。
It costs more than the traditional way and it is hard to control the process of the reaction . these disadvantages have led to some limitations of the composites " production and research . therefore , the developing orientation of in situ composites is to search the means of lowering the cost and controlli ng the process of in situ reaction 但外加法存在着诸如颗粒偏聚、润湿性差、界面强度结合低等缺点，而内生法由于增强颗粒是在基体内部原位反应生成，因此能克服外加法的缺点，但同时内生法所制备的金属基复合材料的成本太高、原位反应不易控制等缺点制约了复合材料的扩大应用，因此发展性能优异复合材料的出路在于寻找降低成本以及控制原位反应的措施。
The experimental results show that in situ reaction between several oxides and al balances adiabatic temperature and controls the drastic reaction between cuo and al . at the same time , this kind of in situ reaction also accelerates the other replacement reactions and makes them react till to the end 实验结果表明采用多种氧化物原位反应法合理调配了不同反应的绝热温度，控制了cuo与al剧烈的铝热反应，同时促进了其它单质氧化物与al反应，使其能自我维持进行下去。
But during the process of in situ reaction , in addition to the reinforced phase , composite will exit the other by - product ( such as fragility phase alsti and al4c3 ) , mean while , it is difficult to control the volume fraction of tic particles accurately , and lead to poor stability of material property 但是目前在原位反应时，除了所预计生成的增强体外，仍会生成其它副反应夹杂物(即脆性相al _ 3ti和al _ 4c _ 3的生成) ，同时对增强体tic颗粒的体积分数也难以精确控制，因而影响材料质量的稳定性。
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。
