氢化锆合金粉常温氧化与烧结性能研究  

Study of oxidation and sintering behavior of zirconium hydride alloy powder

作　　者：李圆圆[1] 朱常桂[1] 代胜平[1] 杨静[1] 乔慧武[1] 

机构地区：[1]中国核动力研究设计院反应堆燃料与材料重点实验室,成都610041

出　　处：《粉末冶金技术》2012年第4期255-259,共5页Powder Metallurgy Technology

摘　　要：对自制的氢化锆合金粉进行常温氧化性能与烧结性能研究。粒径为10～50μm的氢化锆合金粉接触空气1h内增重达到820ppm,24h增重达到1 380ppm,增重曲线基本符合抛物线规律;对氢化锆合金粉进行XRD分析发现,粉料主要以ε相氢化锆存在;对氢化锆合金粉作XPS分析发现,粉料表面存在一层较复杂的氢氧化物与氧化物。用橡胶模等静压成形、真空烧结的方法制备了锆合金烧结体,研究了成形压力、烧结温度对烧结体密度的影响,成形压力与烧结温度越高,烧结体致密度越高,当烧结温度达到1 000℃时,烧结体已接近理论密度,烧结体晶粒呈等轴状,大小约为50μm。经化学分析,烧结锆合金在成分上与氢化前原锆材料相比只有氧、氮、铁含量有所上升,其它合金元素成分基本无变化。Oxidation and sintering behavior of zirconium hydride alloy powder were studied in this paper. The range of zirconium hydride alloy particle size was 10 - 50μm. When the powder was exposed to the air at ambient temperature, the weight gain increased to 820ppm after 1 hour and 1 380ppm after 24 hours, the weight gain curve was approximately parabolic type. Zirconium hydride alloy powder was analyzed by XRD and XPS and it shows that zirconium hydride alloy powder is mainly consist of 8-zirconium hydride; there is a layer of oxides and hydroxides on the surface of the powder. Zirconium hydride alloy powder was compacted by rubber isostatic pressing and the green bodies were sintered in vacuum furnace. The effects of forming pressure and sintered temperature on the density of sintered body were investigated. The density of sintered body increases with the increasing of forming pressure and sintered temperature , nearly fully dense sintered bodies are obtained by increasing the sintered temperature to above 1 000℃. The grains of zirconium alloy sintered body are isometric and have an average size of about 50μm. The elementary composition of sintered body was tested by chemical analysis method. Comparing with the original zirconium alloy material, oxygen, nitrogen and iron contents of zirconium alloy sintered body are increased and other elementary composition is unchanged.

关 键 词：氢化锆 烧结体 氧化 

分 类 号：TF046.4[冶金工程—冶金物理化学]