摘要
通过机械合金化制备Fe-48at%Al金属间化合物粉末,分别按照33%、40%和50%的粉末装载量(体积分数)进行注射成形,成形坯经溶剂脱脂和热脱脂以及1200℃真空烧结,得到FeAl金属间化合物。重点研究粉末装载量对喂料混炼、注射成形温度及压力、脱脂率及烧结组织和力学性能的影响。结果表明,机械合金化FeAl粉末由于具有不规则形状和层片结构,其注射成形喂料流动性较差;在使用高粉末装载量时应提高注射温度和压力,且溶剂脱脂率较低(7h后为94.3%),需进一步延长脱脂时间;FeAl金属间化合物烧结试样的相对密度和抗弯强度均随粉末装载量增大而提高,当粉末装载量为50%,注射温度和注射压力分别为154℃和4.0MPa时,材料的相对密度为92%,抗弯强度达587MPa。
Fe-48at%Al intermetallic powder has been prepared by mechanically alloyed, followed by injection molding with three different powder loadings of 33%, 40% and 50%. The as formed compacts were debinded and then vacuum sintered at 1 200℃. The effects of powder loading on feedstock blending, injection temperature and pressure, debinding rate, microstructure and mechanical properties of sintered compacts have been investigated. The results show that the feedstock fluidity of FeAl powder is poor because of the irregular shapes of the powder; higher injection molding temperature and pressure are required when molding with a higher powder loading. The solvent debinding rate is only 94.3% after 7 h solvent debinding. So, longer debinding time is needed. The relative density and bend strength of sintered compacts increase with increasing of powder loading. After injection molded at 154℃ and 4.0 MPa, vacuum sintered at 1200℃, the FeAl compact with 50% powder loading achieves a relative density of 92% and bend strength of 587 MPa.
出处
《粉末冶金材料科学与工程》
EI
2009年第6期396-399,共4页
Materials Science and Engineering of Powder Metallurgy
基金
国家自然科学基金资助项目(50574052)
