摘要:
采用粉末冶金技术,通过元素粉末混合、偏扩散、反应烧结的方法制备多孔Ti-Al合金材料,研究不同的Al粉添加量对其相结构、孔隙形貌、孔隙率、抗压性能和耐腐蚀性能的影响。研究表明:多孔Ti-Al合金材料在Al含量为5%~15%时,主要平衡相为α-Ti和少量Ti3Al,具有大小并存的闭孔结构;在Al含量为20%~30%时,主要平衡相为Ti3Al和少量TiAl,具有相互贯通的开孔结构;随着Al含量的增加,材料的孔隙率逐渐增大,抗压强度逐渐减小,耐腐蚀性呈先增大后减小趋势,在Al含量为20%时,多孔Ti-Al合金材料的孔隙率为26.7%,抗压强度为63.9 MPa,耐腐蚀性最强。
Abstract:
The porous Ti-Al alloys were prepared by powder metallurgy technique with elemental powder mixing,partial diffusion and reaction sintering.The effects of Al powder addition on phase structure,pore morphology,porosity,compressive properties and corrosion resistance of the alloy were investigated.The results show that the main equilibrium phase of the porous Ti-Al alloy is α-Ti and a small amount of Ti3Al at the Al content of 5%～15%,and it has a closed pore structure with different sizes.The main equilibrium phase of the porous Ti-Al alloy is Ti3Al and a small amount of TiAl at the Al content of 20%～30%,and it has an interpenetrating open-pore structure.As the Al content increases,the porosity of the alloy increases gradually,and the compressive strength decreases gradually,with the corrosion resistance increasing first and then decreasing.At the Al content of 20%,the porosity of the porous Ti-Al alloy is 26.7%,and the compressive strength is 63.9 MPa with the strongest corrosion resistance.
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