铼酸铵粒度对铼粉压制性能的影响

Pressing Property of Rhenium Powders with Ammonium Rhenate Particle Size

铼粉作为铼制品的基础原料,其压制性能是影响产品质量和服役性能的关键因素之一。分别以4种不同粒度的铼酸铵作为原料,通过两步氢还原法制得铼粉,后续以场发射扫描电镜(SEM)、X射线衍射仪(XRD)、费氏粒度仪、粉体物性仪等设备,表征和测试粉体的微观形貌、物相、粒度以及物性指标,进而综合研究粒度对铼粉压制性能的影响规律。结果表明:铼酸铵粒度变小对前驱体粉的微观形貌影响很大,粉体整体从颗粒状演变为片状,最终呈树枝状;同时铼酸铵的粒度降低使制得铼粉的费氏粒度和激光粒度皆变小(最低为2.53μm和24.1μm),振实密度和填充密度也相应降低,进而使粉体的压制性能得到改善。

As the raw material of rhenium products,the pressing property of rhenium powder is one of the key factors affecting product quality and service performance.Four kinds of rhenium powders with different particle sizes were used as raw materials to prepare rhe‐nium powder by two-step hydrogen reduction method.Subsequently,the micro-morphologies,phase,particle size and physical proper‐ties of the powders were characterized and tested by field emission scanning electron microscopy,X-ray diffractometer,fischer particle size meter,powder physical properties meter and other equipment.And then the influences rule of particle size on the formability of rhenium powders were comprehensively investigated.The results show that the refinement of particle of the raw material had great influ‐ences on the micromorphology of the as-prepared powders,which the whole shape evolved from granular to flake and finally dendritic.Meanwhile,the obtained fischer particle size(minimum 2.53μm),laser particle size(minimum 24.1μm),the vibration density and the filling density all decreased correspondingly,while the pressing property of the rhenium powders was greatly improved.