占位剂K<sub>2</sub>SO<sub>4</sub>对NiCu合金多孔膜孔结构的影响

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Abstract The Ni-K₂SO₄ mixed powder, in which Ni element powder is the raw material, and K₂SO₄ powder is the space-holder, is added into the polyvinyl butyral (PVB) ethanol solution to make a slurry, which is coated on the Cu foil. NiCu alloy porous membrane was prepared basing on Kirkendall effect by vacuum sintering. The influence of K₂SO₄contenton on area shrinkage, permeability, pore size, macro and micro morphologies of porous membrane and the influence of K₂SO₄ on the pore structure of porous membranes at different temperatures were investigated. The effect mechanism of K₂SO₄on pore structure of the porous alloy membrane during sintering process was also studied. The results show that with the increase of w(K₂SO₄) in Ni-K₂SO₄ mixed powder, the permeability of porous membrane first increases and then decreases. When the mass fraction of K₂SO₄ is lower than 40%, with the increase of K₂SO₄ content, the shrinkage rate of the film decreases and the permeability increases. The maximum permeability is 2 361 m³/(m²·h·kPa). The maximum pore diameter of the sample with little change is about 45 µm. When the w(K₂SO₄) is more than 40%, the permeability and pore diameter of the porous film both decrease obviously. When the w(K₂SO₄) is more than 60%, the permeability of the film layer is lower than that of the lower limit of the test instrument. Proper amount of K₂SO₄ can improve the permeability of porous alloy membrane through hindering sintering densification based on the space occupying effect in the Ni coating, but excessive amount of K₂SO₄ will block the diffusion of Cu atoms to Ni powder layer, which makes it difficult to form through-pores on the Cu foil, resulting in a significant decrease in permeability.

Key words： K₂SO₄ porous membrane NiCu alloy permeability pore diameter space-holder

Received: 18 December 2021 Published: 07 May 2021

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	FENG Luli
	YU Linping
	GAN Qingzhan
	GAO Haiyan
	HE Yuehui

Cite this article:

FENG Luli,YU Linping,GAN Qingzhan, et al. Effect of K₂SO₄space-holder on pore structure of NiCu alloy porous membrane[J]. Materials Science and Engineering of Powder Metallurgy, 2021, 26(2): 147-154.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2021/V26/I2/147

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