研究与开发Fe-Cu粉末机械合金化的过程与固态烧结后组织性能关系研究

Mechanical alloying of Fe-Cu powder and microstructure of solid phase sintered body

分析了机械合金化过程中粉体能量储存对固态烧结过程的影响。以具有正的混合热的Fe-Cu粉体为研究对象,分析了Fe-Cu粉体在机械合金化中存在的储能现象及其与机械合金化过程时间的关系,提出了存在最高储能的机械合金化时间,这一储能对固态烧结具有积极意义。研究认为:机械合金化进程中,粉体粒度、晶粒度、应变、缺陷等不平衡因素导致能量提高,固态烧结加热过程中能量的释放促进了颗粒表面物质交换,从而提高了粉体固态可烧结性,改善了烧结组织。

The effect of stored energy produced by mechanical alloying on the solid state sintering was analyzed in this paper. The Fe-Cu powders having a lot of positive mixing heat were studied. The energy storing in Fe-Cu powders under mechanical alloying and the relationship between stored energy and mechanical alloying time were analyzed. A best mechanical alloying time is presented under which the stored energy could get the maximum. The stored energy in the powders has a positive effect on solid state sintering. The energy in the powders is increased by the unbalance factors such as the particle size, grain size, strain and defects. The stored energy is released in the heating proce.~s of solid state sintering which accelerates the mass exchange between the particle surfaces. So the solid state sintering character and the structure of the sintered body are improved.