【摘要】 流动温压工艺是一项以短流程低成本制造复杂几何形状零件的粉末冶金新工艺。该文作者自行设计并制造了一套流动温压成形横向流动能力及横向压力测量装置,用于研究流动温压专用混合粉末的制备,考察压制速度、温度及轴向压力对W-34Ni-5Fe混合粉末横向成形能力的影响。结果表明,该混合粉末在一定的温度下具有横向流动的能力,横向压力随压制速度和轴向压力增大而增大;横向距离愈长,横向压力愈小,将混合粉末加热到粘结剂的熔点温度96℃时横向压力最大。实验初步证明了流动温压成形十字形粉末冶金零件的可行性。更多还原

【Abstract】 Warm flow compaction is a new,simple and economy process that can produce complex powder metallurgy parts.A special apparatus for measuring the lateral flow capability and pressure of the powder has been designed and manufactured,it can be used to analyze the feasibility of forming complex cross-shaped parts.The preparation of the powder blend and effects of pressing speed,temperature and axial pressure on the lateral flow capability of a tungsten-base powder mix are investigated.Results show that the lateral-pressure increases with increasing pressing speed and axial-pressure.The lateral-pressure decreases as lateral-distance increases.The biggest lateral-pressure is obtained when the powder blend is pressed at around 96 ℃,at which the binder starts to melt.Besides,the cross-shaped powder metallurgy parts are successfully prepared by warm flow compaction.更多还原