摘要
采用高能球磨机械合金化、模压成型和真空烧结法制备了添加碳、钴和稀土氧化物粉末的W-Ni-Fe高密度合金。分别用阿基米德排水法、洛氏硬度计、XRD、SEM和EDX等手段研究了几种合金试样的密度、硬度、钨晶粒度和组织形貌。结果表明:采用高能球磨制得纳米晶预合金粉可以降低合金的烧结温度;采用纳米晶预合金粉末烧制的W-Ni-Fe合金的最佳烧结工艺为1350℃×75 min。碳作为添加剂可以提高合金硬度和降低烧结温度;添加钴可以降低烧结温度,钴和稀土氧化物粉共同添加可以提高合金致密度和细化晶粒。
W-Ni-Fe tungsten high density alloys with Me(Co, RE) were fabricated by high energy ball milling mechanical alloying,combined mould compact and lower temperature sintering technique. The relative density of alloys samples were tested by the Draining Water Law of Archimedes and its hardness was tested by a HR - 150A Rockwell hardness tester. The granularities and appearances of three kinds of samples after different sintering process have been analyzed by XRD, SEM and EDX. The results show that the sintering temperature of alloys decreased because the technique was adopted to prepare nanograin prealloyed powders by high energy ball milling. The sintering technology of W - Ni -Fe tungsten high density alloys which were fabricated with nanograin prealloyed powders is 1350 ℃×75 minutes. C as additive element can increase hardness and lower sintering temperature of W-Ni-Fe tungsten heavy alloys. Co as additive element can lower the sintering temperature. Co and RE mixed powders can increase the density of sample, and fine the grains.
出处
《南昌航空工业学院学报》
CAS
2005年第1期40-44,共5页
Journal of Nanchang Institute of Aeronautical Technology（Natural Science Edition）
基金
江西省材料科学与工程研究中心开放基金(ZX200301008)
