摘要
采用高能机械球磨方法制备了超细钨粉,经冷等静压和1465℃分解氨气氛中液相烧结制得高密度钨合金.研究了纳米晶亚微米颗粒钨粉对烧结态93W-4.9N i-2.1Fe高密度钨合金微观组织及性能的影响.研究表明:采用超细钨粉与低温液相烧结技术,获得了高相对密度(大于99.7%)的烧结态高密度钨合金,且细钨颗粒组织均匀分布于粘结相中;与采用亚微米颗粒钨粉的烧结态钨合金相比较,不仅微观组织弥散分布,而且具有较高的力学性能;液相烧结态钨合金的力学性能主要与原始钨粉粒度及烧结温度有关.
Ultra-fine tungsten powders was produced by high energy mechanically milling in a high-energy attritor mill. Then the mixing powders were consolidated into green compacts by CIP and liquid-phase sintered at 1465 ℃ in the dissociated ammonia atmosphere. Effect on the microstructure and the properties of liquid-phase sintered 93W - 4. 9Ni - 2. 1Fe tungsten heavy alloys composed of nanocrystalline sub-micron tungsten powders was investigated. Liquid-phase sintered tungsten heavy alloys exhibited high relative density （above 99.7% ）, and fine spherical tungsten particles embedded homogeneously in the matrix were obtained due to the combination of uhra-fine tungsten powders and lower sintering temperature. Mechanical properties have been improved compared with the traditionally sintering alloys. The mechanical properties of a tungsten heavy alloy were found mainly dependent on the particles size of raw tungsten powders and liquid-phase sintering temperature.
出处
《材料科学与工艺》
EI
CAS
CSCD
北大核心
2006年第4期385-388,共4页
Materials Science and Technology
基金
国防科工委重点应用基础研究资助项目(1.3.1.5)
关键词
高密度钨合金
机械球磨
液相烧结
纳米晶
显微组织
tungsten heavy alloys
mechanical milling
liquid-phase sintering
nanocrystalline
microstmcture
