摘要
以金属Ti粉和Al粉为原料,采用粉末冶金法制备多孔Ti-15Al合金材料,并研究不同的烧结温度对其物相成分、微观孔隙结构、抗压性能和耐腐蚀性能的影响。结果表明:多孔Ti-15Al合金在高温烧结后,因金属Ti和Al之间发生偏扩散和固相反应而形成了α-Ti和Ti_(3)Al的平衡相,随着烧结温度的升高,合金中孔隙结构逐渐由长条状的贯通孔向近似球状的封闭孔转变,且孔隙率和平均孔径尺寸均呈先增大后减小的变化,在1300℃烧结后的孔隙率和孔径尺寸最小,最小值分别为11.6%和13.8μm;因材料孔隙结构的转变,导致多孔Ti-15Al合金的抗压强度和耐腐蚀性能均随烧结温度的升高先增大后减小,烧结温度为1300℃时的抗压强度和耐腐蚀性能最好,最大抗压强度为79 MPa,最小腐蚀电流密度为2.05×10^(−7) A/cm^(2)。
The porous Ti-15Al alloy materials were prepared by powder metallurgy with Ti and Al powder as raw materials.The effects of different sintering temperatures on the phase composition,micropore structure,compressive and corrosion resistance were studied.The results show that the equilibrium phase ofα-Ti and Ti_(3)Al is formed due to partial diffusion and solid-phase reaction between metal Ti and Al after the porous Ti-15Al alloy sintered at high temperature.With the increase of sintering temperature,the structure gradually changes from elongated through-holes to nearly spherical closed pores,and the porosity and average pore size both increases first and then decreases.The porosity and pore size after sintering at 1300℃reach the minimum,with values of 11.6%and 13.8μm,respectively.Due to the change of pore structure,the compressive strength and corrosion resistance of porous Ti-15Al alloy increase first and then decrease with the increase of sintering temperature.The compressive strength and corrosion resistance of porous Ti-15Al alloy are the best when the sintering temperature is 1300℃,the maximum compressive strength is 79 MPa,and the minimum corrosion current density is 2.05×10^(−7) A/cm^(2).
作者
张美丽
代卫丽
刘彦峰
韩茜
Zhang Meili;Dai Weili;Liu Yanfeng;Han Xi(Shannxi Key Laboratory of Comprehensive Utilization of Tailings Resources,Shangluo University,Shangluo 726000,Shannxi,China;Shannxi Engineering Research Center for Mineral Resources Clean&Efficient Conversion and New Materials,Shangluo University,Shangluo 726000,Shannxi,China)
出处
《钢铁钒钛》
CAS
北大核心
2022年第4期55-61,共7页
Iron Steel Vanadium Titanium
基金
陕西省教育厅专项科研计划资助项目(20JK0618)
商洛市科技局科学技术研究发展计划项目(2020-Z-0083)
商洛市高性能有色金属制备与加工技术创新团队(SK2019-75)。
关键词
多孔Ti-15Al合金
粉末冶金
烧结温度
物相成分
孔隙结构
抗压强度
耐腐蚀性
porous Ti-15Al alloy
powder metallurgy
sintering temperature
phase composition
pore structure
compressive strength
corrosion resistance
