汽车排气歧管用耐热球墨铸铁的抗氧化性研究  

Oxidation Resistance of Heat-resisiting Cast Iron for Exhaust Manifold

作　　者：于海侠[1] 杨云龙[1,2] 曹占义[2] 邓学涛[3] 

机构地区：[1]吉林工业职业技术学院,吉林132013 [2]吉林大学材料科学与工程学院,吉林130025 [3]中国船舶重工集团公司第十二研究所,陕西兴平713102

出　　处：《热加工工艺》2014年第8期43-45,49,共4页Hot Working Technology

基　　金：吉林省科技项目(2007301)

摘　　要：通过对所开发的汽车排气歧管用高硅钼球墨铸铁和高镍球墨铸铁的质量变化动力学和氧化层厚度变化进行研究。结果表明,高硅钼球墨铸铁和高镍球墨铸铁的质量和氧化层厚度均随工作时间延长而增大,且高硅钼球墨铸铁的增幅大于高镍球墨铸铁的增幅。并通过对表面成分分析,进一步了解了表面成分的变化情况。元素硅主要以Fe2SiO4形式存在。高硅钼球墨铸铁的质量动力学曲线符合抛物线规律,而高镍球墨铸铁的质量变化动力学曲线不符合符合抛物线规律。To evaluate the oxidation resistance properties during high temperature service, some sheet specimens of high Si-Mo ductile cast iron （DCI） and ductile Ni-resist cast iron （DNCI） were aged at 800-1000 ℃ at high temperature electric resistance furnace. The oxide thickness of both high Si-Mo DCI and DNC! changes with time. The thickness of oxide layer of high Si-Mo DCI is much thicker than that of DNCI during the same heating time. Protective silica may form or transform into Fe：SiO4. The relations between the oxide added weight and heat time at different temperature were achieved. The oxidation process of high Si-Mo DCI was up to parabolic curve law, but the oxidation process of DNCI was not up to parabolic curve law.

关 键 词：高硅钼球墨铸铁 高镍球墨铸铁 抗氧化性 汽车排气歧管 

分 类 号：TG143[一般工业技术—材料科学与工程]