预混合工艺对铁基粉末冶金材料组织和烧结性能的影响  

Effects of pre-mixing process on microstructure and sintering properties of iron-based powder metallurgy materials

作　　者：陈闻超[1,2] 程继贵 陈鹏起[1,2] 王晶辉 张建华 李其龙 CHEN Wen-chao;CHENG Ji-gui;CHEN Peng-qi;WANG Jing-hui;ZHANG Jian-hua;LI Qi-long(School of Materials Science and Engineering,Hefei University of Technology,Hefei 230009,China;Research Centre for Powder Metallurgy Engineering and Technology of Anhui Province,Hefei 230009,China;Hefei Bolin Advanced Materials Co Ltd,Hefei 230088,China)

机构地区：[1]合肥工业大学材料科学与工程学院,安徽合肥230009 [2]安徽省粉末冶金工程技术研究中心,安徽合肥230009 [3]合肥波林新材料股份有限公司,安徽合肥230088

出　　处：《材料热处理学报》2020年第3期131-137,共7页Transactions of Materials and Heat Treatment

基　　金：科技型中小企业技术创新基金(13C26213402742)。

摘　　要：通过加入新型润滑剂制得Fe-2Cu-0.8C预混合铁基粉末,并制备了同成分机械混合粉末进行对比试验。对粉末流动性、松装密度以及压制性能进行了测试,并对烧结体的微观组织进行表征。结果表明:制备的预混合粉末流动性和松装密度均优于机械混合粉。当润滑剂加入量为0.6 mass%时,经600 MPa压力下压制所得的生坯密度为7.01 g/cm^3,烧结体密度为7.11 g/cm^3,批量压制时零件质量变化小于0.15%。通过预混合工艺,使得铜和石墨颗粒粘结到铁颗粒表面上,从而达到防止偏析和提高批次稳定性的目的。使用预混合粉末不仅提高了烧结体的尺寸精度和性能,同时可制备出更光洁的零件表面,进行形状复杂零件生产时更能体现出其在稳定性方面的优势。Pre-mixed Fe-2 Cu-0.8 C iron-based powder was prepared by adding a new lubricant,and the mechanical mixed powder with the same composition was prepared for comparative test.The flow ability,apparent density and compressibility of the powder were tested,and the microstructure of the sintered sample was characterized.The results show that the flow ability and apparent density of the prepared pre-mixed powder are better than those of the mechanical mixed powder.When the amount of lubricant is 0.6 mass%,under compaction pressure of 600 MPa,the density of green billet is 7.01 g/cm^3 and the density of the sintered sample is 7.11 g/cm^3,and the mass change of parts is less than 0.15%when pressed in batches.Through pre-mixing process,copper and graphite particles are bonded to the surface of iron particles,so as to prevent segregation and improve stability of the pre-mixed powder mixtures.The use of pre-mixed powder not only improves the dimensional accuracy and properties of the sintered sample,but also produces a more smooth surface of the parts,which can better reflect its advantages in stability in the production of complex shape parts.

关 键 词：粉末冶金 预混合铁基粉末 微观组织 稳定性 

分 类 号：TF123.9[冶金工程—粉末冶金]