多场耦合烧结Fe-2Cu-2Ni-1Mo-0.8C合金的摩擦磨损性能  

Tribological properties of Fe-2Cu-2Ni-1Mo-0.8C alloys sintered in multiple coupling fields

作　　者：李小强[1] 唐愈[1] 叶永权[1] 梁华星[1] 

机构地区：[1]华南理工大学机械与汽车工程学院,广州510640

出　　处：《粉末冶金材料科学与工程》2010年第1期44-48,共5页Materials Science and Engineering of Powder Metallurgy

基　　金：国家高技术研究发展计划(863计划)资助项目(2007AA03Z112);国家重点基础研究发展规划(973计划)专项课题(2007CB616905);广东省自然科学基金项目(x2jqB6080210)

摘　　要：采用电场、磁场、应力场和温度场多场耦合成形与烧结一体化技术制备高致密Fe-2Cu-2Ni-1Mo-0.8C合金,利用光学显微镜和扫描电镜对该合金的显微组织以及磨损表面进行观察和分析,重点研究耦合外加脉冲磁场对合金耐磨性能的影响。结果表明,在电场、应力场和温度场三场耦合放电等离子烧结技术的基础上进一步耦合适合的脉冲磁场,可明显改善烧结合金微观组织和合金元素分布的均匀性,不仅提高合金的耐磨性,同时还可显著提高合金的耐磨性能均匀性。在峰值电流、基值电流、频率、占空比分别为2700A、360A、50Hz和50%的脉冲电流以及烧结压力为30MPa的条件下烧结铁基合金粉末3min,耦合外加脉冲磁场强度为2.36×106A/m时,烧结材料的耐磨性能最佳,合金的磨损机制主要为粘着磨损。The high density Fe-2Cu-2Ni-1Mo-0.8C alloys were prepared by an integrated technique of forming and sintering in electric,magnetic,stress and temperature fields. The microstructure and wear surface of the iron-based alloys were evaluated by means of optical microscopy and scanning electron microscopy. In the present paper,the investigation mainly focused on the effect of coupled pulse magnetic field on the tribological properties of sintered alloys. The results show that the microstructure and distribution uniformity of alloying elements of sintered alloys are markedly improved by coupling a proper pulse magnetic field,with and on the basis of spark plasma sintering,which is essentially a sintering by coupling electric,stress and temperature fields. Sequentially,the wear resistance and its homogeneity are also obviously enhanced. When a pulse current,of 2 700 A peak current,360 A base current,50 Hz repetition frequency and 50% duty ratio,is used to sinter the powders for 3 min under 30 MPa pressure,the tribological properties of the sintered alloys are optimal by coupling a pulse magnetic field of 2.36×106A/m. The corresponding wear mechanism is mainly adhesion wear.

关 键 词：铁基合金 多场耦合烧结 组织 摩擦磨损性能 

分 类 号：TF124[冶金工程—粉末冶金]