摘要
以 Ti、Al 元素粉末为原料,分别添加(NH4)2CO3和尿素,利用偏扩散反应,制备高孔隙度,孔特征可控的 TiAl 金属间化合物多孔材料。通过 XRD、SEM、金相显微技术等表征手段,研究造孔剂含量对 TiAl 金属间化合物多孔材料的物相结构、孔径、总孔隙率、透气度、膨胀率及力学性能的影响。结果表明:造孔剂对多孔材料物相组成没有影响;分别添加 7%碳酸铵和尿素后,平均孔径分别对应为 30.6 μm 和 28.8 μm,体积膨胀率增大到45.6%和 44.4%,总孔隙率为 49.9%和 48.3%,透气度为 307.3 m3/(m2 kPa1 h1)和 302.1 m3/(m2 kPa1 h1),极限抗拉强度分别为 27.85 MPa 和 32.49 MPa。
Ti and Al intermetallic compound porous materials with high porosity and controllable pore characteristics were prepared by partial diffusion reaction using Ti and Al powders as raw materials and(NH4)2CO3 and urea as pore formation agent. By means of XRD, SEM and metallographic microscopy, the effects of pore-forming agent content on the phase structure, pore size, total porosity, permeability, expansion rate and mechanical properties of TiAl intermetallic compound porous materials were studied. The results show that the pore-forming agent has no effect on the phase composition of porous materials, and the average pore diameters are 30.6 mm and 28.8 mm respectively with adding 7%ammonium carbonate and urea, the volume expansion rate increases to 45.6% and 44.4%, the total porosity is 49.9% and48.3%, the permeability is 307.3 m3/(m2·kPa1·h1) and 302.1 m3/(m2·kPa1·h1), and the ultimate tensile strength are 27.85 MPa and 32.49 MPa respectively.
作者
刘羽祚
李喜德
李菊英
裴后昌
杨军胜
贺跃辉
LIU Yuzuo;LI Xide;LI Juying;PEI Houchang;YANG Junsheng;HE Yuehui(School of Mechanical Engineering, Wuhan Polytechnic University, Wuhan 430023, China;State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China)
出处
《粉末冶金材料科学与工程》
EI
北大核心
2019年第3期255-260,共6页
Materials Science and Engineering of Powder Metallurgy
基金
国家自然科学基金(51704221)
武汉轻工大学杰出青年基金(2018J05)
关键词
造孔剂
尿素
TIAL
金属间化合物
多孔材料
抗拉强度
pore-forming agent
urea
TiAl
intermetallic compound
porous material
tensile strength