摘要
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 metal was prepared by elemental powders blending and reaction sintering methods. The influence of particle size, the fraction of Ti and Al powder, pressing pressure, sintering temperature on the pore character of TiAl porous metal was studied. The results show that with increasing Al powder particle size, the dmax and expansion coefficient increased, but the porosity and Kgas increased only when the Al powder particle size was larger than 14.6 μm. The porosity and Kgas decreased with the decrease of larger particle Al powder fraction, while the dmax exhibited a little change. The porosity and Kgas increased to a certain value and then decreased with decreasing fine particle Al powder fraction. All of the dmax, porosity and Kgas decreased with increasing pressing pressure. With the increase of sintering temperature, Kgas decreased above 800 ℃ but increased below 800℃.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2008年第A04期561-564,共4页
Rare Metal Materials and Engineering
基金
国家科技支撑计划项目(2007BAE07B05)
