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采用元素混合法以及反应烧结法制备了TiAl多孔材料,研究了粉末粒度、Ti:Al的原子比、压制压力、烧结温度等对TiAl多孔材料的孔隙性能的影响。结果表明,随着原料Al粉的粒度逐渐增大,TiAl多孔材料的dmax和膨胀率增大,但其孔隙度和Kgas则是在Al粉粒度大于14.6μm时才随之增大。随着粗Al粉含量的降低,TiAl多孔材料的孔隙度和Kgas呈逐渐下降的趋势,dmax变化不大;而细Al粉制得的TiAl多孔材料的孔隙度和Kgas是先升到一定值后才下降。随着压制压力的增大,dmax逐渐降低,孔隙度和K气也相应减小。当烧结温度低于800℃时,TiAl多孔材料的Kgas随着烧结温度的升高而提高;当烧结温度高于800℃后,TiAl多孔材料的Kgas随着烧结温度的升高而下降。
TiAl porous materials were prepared by elemental mixing and reactive sintering. The effects of powder size, atomic ratio of Ti to Al, pressing pressure and sintering temperature on the porous properties of TiAl porous materials were studied. The results show that the porosity and Kgas of TiAl porous materials increase with the increase of Al particle size above 14.6μm with the increase of particle size of Al powders. With the reduction of coarse Al content, the porosity and Kgas of TiAl porous material tend to decrease gradually, while dmax has little change. However, the porosity and Kgas of TiAl porous material prepared from fine Al powder first increase to a certain value Only drop. As the pressing pressure increases, dmax gradually decreases, porosity and K-gas decrease accordingly. When the sintering temperature is lower than 800 ℃, the Kgas of TiAl porous material increases with the sintering temperature. When the sintering temperature is higher than 800 ℃, the Kgas of TiAl porous material decreases with the sintering temperature.