Study on Structures and Properties of Cast Irons Reinforced by Trace Addition of Modified SiC Nanopowders
To improve the performance of traditional cast iron, trance amount of surface modified nanometer SiC powders were added into the melted iron. The microstructures, the mechanical properties, as well as the wear resistance were investigated. The trace addition of SiC nano-powders were active due to the presence of structural defects arising from the treatment, they were efficient in affecting not only the generation and growth of crystals but also change the morphology of graphite. On the other hand, the addition of SiC nanopowders as heterogeneous seedings in the crystallization of liquid metals leaded to the changing of supercooling temperature, so the ratio of ferrite and pearlite was changed. The mechanical characteristics and wear resistance were enhanced as a result of the improved graphite shape and changed matrix composition caused by the trace addition of SiC nanopowders (in amounts of about 0.01％mass). The strengthening mechanism and the free gap between powders were also discussed. It is suggested that the tensile strength, toughness, as well as the wear resistance can be improved simultaneously, which indicates the novel strengthening technology by trace addition of nanopowders is promising to extend to large-scale industrial production.
surface modified SiC nanometer powders microstructure mechanical properties wear resistance
李建卫 陈美玲 高宏
华东理工大学,上海,200237 大连交通大学,辽宁大连,116028
国际会议
成都
英文
2007-11-19（万方平台首次上网日期，不代表论文的发表时间）