铁粉原料类型对Fe–29Ni–17Co可伐合金组织性能影响  

Effects of raw iron powder type on the microstructure and properties of Fe-29Ni-17Co Kovar alloys

作　　者：张美 陈志鹏 李佳欣[1,2] 陈闻超 陈鹏起[1,2] ZHANG Mei;CHEN Zhipeng;LI Jiaxin;CHEN Wenchao;CHEN Pengqi(School of Materials Science and Engineering,Hefei University of Technology,Hefei 230009,China;Anhui Provincial Powder Metallurgy Engineering Research Center,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学材料科学与工程学院,合肥230009 [2]合肥工业大学安徽省粉末冶金工程技术研究中心,合肥230009

出　　处：《粉末冶金技术》2024年第3期234-241,共8页Powder Metallurgy Technology

基　　金：安徽省重点研究与开发项目(202104a05020046)。

摘　　要：分别以还原铁粉和羰基铁粉为原料,与镍粉和钴粉混合制备Fe–29Ni–17Co粉末混合料,通过压制、烧结得到Fe–29Ni–17Co可伐合金烧结体试样,研究了原料铁粉类型和烧结温度对烧结体显微组织和相关性能的影响。结果表明,由羰基铁粉制备的烧结体有较高的密度,1250℃烧结得到的烧结体试样相对密度达97.51%,比由还原铁粉制得的烧结体相对密度高约1.40%。羰基铁粉较还原铁粉为原料制得的烧结体具有更好的综合性能,其硬度和抗拉强度分别为HRB 84.6和533.8 MPa,热导率、平均热膨胀系数(20~400℃)及电阻率分别为16.45 W·m^(-1)·K^(-1)、4.71×10^(-6)K^(-1)和0.38Ω·cm。此外,由羰基铁粉制得的烧结体显微组织中奥氏体分布更为均匀,低温处理后组织稳定性好,马氏体相变程度低。Fe–29Ni–17Co powder mixes were obtained by mixing nickels and cobalt powders,using the reduced iron powders and carbonyl iron powders as the raw materials,respectively,and the sintered Fe–29Ni–17Co Kovar alloy samples were prepared by pressing and sintering at the different temperatures.The effects of the raw iron powder type and sintering temperature on the microstructure and properties of the sintered body were investigated.The results show that the sintered samples prepared by the carbonyl iron powders have the higher relative density and the better comprehensive performance,the relative density of the sintered body sintered at 1250℃is 97.51%,which is about 1.40%higher than that of the sintered body prepared by the reduced iron powders.The hardness and tensile strength of the samples prepared by the carbonyl iron powders reach HRB 84.6 and 533.8 MPa,respectively,and the thermal conductivity,average thermal expansion coefficient(20~400℃),and electrical resistivity are 16.45 W·m^(-1)·K^(-1),4.71×10^(-6) K^(-1),and 0.38Ω·cm,respectively.The distribution of austenite in the sintered body obtained from the carbonyl iron powders is more uniform,the microstructure stability is better after the low temperature treatment,and the degree of martensitic transformation is lower.

关 键 词：可伐合金 粉末冶金 还原铁粉 羰基铁粉 烧结温度 

分 类 号：TF125.1[冶金工程—粉末冶金]