W-Mo-Ni-Fe合金的微波烧结  

Microwave sintering of W-Mo-Ni-Fe alloys

作　　者：周承商[1] 易健宏[1,2] 张浩泽[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083 [2]昆明理工大学材料科学与工程学院,昆明650093

出　　处：《中国有色金属学报》2012年第10期2818-2824,共7页The Chinese Journal of Nonferrous Metals

基　　金：湖南省研究生科研创新项目资助(CX2010B045)

摘　　要：研究微波烧结88W-5Mo-4.9Ni-2.1Fe和78W-15Mo-4.9Ni-2.1Fe两种W基合金,并与常规烧结该合金的性能进行比较。通过扫描电镜观察材料的显微组织,利用EDS能谱分析W晶粒和合金粘接相的成分,采用XRD分析样品的物相组成。结果表明:在1 480℃微波烧结5 min条件下,88W和78W合金的密度分别为16.70 g/cm3和15.55 g/cm3,抗拉强度分别达到1 175 MPa和1 065 MPa,伸长率分别为3.0%和6.9%,硬度值分别达40.3 HRC和32.5 HRC,其力学性能均超过常规烧结合金。微波烧结合金晶粒细小均匀,常规烧结78W合金组织中有中间相组织存在,导致其性能恶化,而微波烧结78W合金组织中未发现该中间相存在。88W-5Mo-4.9Ni-2.1Fe and 78W-15Mo-4.9Ni-2.1Fe alloys were microwave sintered, and their properties were compared with conventional sintered alloys. The microstructure of alloys was analyzed by scan electronic microscopy. The element contents of W grains and matrix was characterized by EDS and the phase composition was determined by XRD. The results show that the 88W alloy has density of 16.70 g/cm3, tensile strength of 1 175 MPa, elongation of 3.0% and hardness of 40.3 HRC, the 78W alloy has density of 15.55 g/cm3, tensile strength of 1 065 MPa, elongation of 6.9% and hardness of 32.5 HRC after microwave sintering at 1 480 ℃ for 5 min. The properties of microwave sintered alloys excel conventional sintering. The microwave sintering results in a finer mierostructure. The existence of an intermetallic phase in conventional sintered 78W alloys leads to the properties deteriorating. However, there is no intermetallic phase in the microwave sintered 78W alloys.

关 键 词：W-Mo-Ni-Fe合金 微波烧结 力学性能 显微组织 

分 类 号：TF125.2[冶金工程—粉末冶金] TG146.4[冶金工程—冶金物理化学]