改性纳米SiC粉体对灰铸铁热膨胀性能的影响  

Effect of Modified Nano-SiC Powders on the Thermal Expansion of Gray Cast Iron

作　　者：刘桂林[1] 高宏[1] 陈美玲[1] 师磊[1] 

机构地区：[1]大连交通大学材料科学与工程学院,辽宁大连116028

出　　处：《铸造》2014年第3期280-282,共3页Foundry

摘　　要：采用在铸造过程中添加纳米SiC的强韧化技术,研究了改性纳米SiC的添加工艺和添加量(0.05%、0.1%)对普通HT250及合金化HT250的组织及热膨胀平均系数的影响。结果表明,加入纳米SiC粉体后HT250组织的石墨得到细化,石墨片短小且分散均匀,对机体的割裂作用小。加入改性的纳米SiC的试样的热膨胀性比没有加入改性纳米SiC的试样明显减小。By using the toughening technology adding nano-SiC in the casting process, the effect of the adding technology and the addition amount （0.05%, 0.1%） of nano-SiC to the microstructure and the average coefficient of thermal expansion of the ordinary HT250 and alloying HT250 were investigated. The results show that the microstructure of liT250 with nano-SiC is refined; the graphite sheet of the microstructure is short and evenly distributed, which has little cutting effect on the matrix. Compared with the original HT250, the thermal expansion of the gray iron with modified nano-SiC is decreased obviously.

关 键 词：改性纳米SIC粉体 灰铸铁 热膨胀 

分 类 号：TB383.1[一般工业技术—材料科学与工程]