造孔剂(NH4)2CO3和尿素含量对TiAl 多孔材料性能的影响

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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。

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	刘羽祚
	李喜德
	李菊英
	裴后昌
	杨军胜
	贺跃辉

关键词 ：造孔剂, 尿素, TiAl, 金属间化合物, 多孔材料, 抗拉强度

Abstract：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 μm and 28.8 μm 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% and 48.3%, 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.

Key words： pore-forming agent urea TiAl intermetallic compound porous material tensile strength

收稿日期: 2018-12-19 出版日期: 2019-07-11

ZTFLH:

TG146

基金资助:国家自然科学基金(51704221); 武汉轻工大学杰出青年基金(2018J05)

通讯作者: 杨军胜,讲师,博士。电话：18672769337;E-mail: yangjunsheng2008@163.com

引用本文:

刘羽祚, 李喜德, 李菊英, 裴后昌, 杨军胜, 贺跃辉. 造孔剂(NH₄)₂CO₃和尿素含量对TiAl 多孔材料性能的影响[J]. 粉末冶金材料科学与工程, 2019, 24(3): 255-260.
LIU Yuzuo, LI Xide, LI Juying, PEI Houchang, YANG Junsheng, HE Yuehui. Effect of pore-forming agent (NH₄)₂CO₃ and urea on properties of porous TiAl intermetallics. Materials Science and Engineering of Powder Metallurgy, 2019, 24(3): 255-260.

链接本文:

http://pmbjb.csu.edu.cn/CN/ 或 http://pmbjb.csu.edu.cn/CN/Y2019/V24/I3/255

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