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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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

Received: 19 December 2018 Published: 11 July 2019

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	Articles by authors
	LIU Yuzuo
	LI Xide
	LI Juying
	PEI Houchang
	YANG Junsheng
	HE Yuehui

Cite this article:

LIU Yuzuo,LI Xide,LI Juying, et al. Effect of pore-forming agent (NH₄)₂CO₃ and urea on properties of porous TiAl intermetallics[J]. Materials Science and Engineering of Powder Metallurgy, 2019, 24(3): 255-260.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2019/V24/I3/255

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