Preparation of Porous TiO2/Stainless-steel Membranes by Carbon Assisted Solid-state Particle Sintering

doi:10.15541/jim20140531

Abstract

Abstract:

Porous ceramic membranes on macroporous metal support without any intermediate layer were prepared by a solid-state particle sintering assisted with carbon. Nano-scale TiO₂ particle and macroporous stainless-steel tube were employed as membrane material and support, respectively. For surface coating, polyvinyl alcohol (PVA) was used as adhesive agent, and dip-coating procedure was performed. Effect of different sintering atmosphere (i.e., nitrogen and air) during the preparation of porous ceramic membrane was investigated. For characterization, scanning electron microscopy, X-ray diffraction, thermogravimetry and porometry analyses were conducted, respectively. It was found that serious peeling of the ceramic membrane was occurred when the coated sample was heat-treated in air, but an integrated membrane was achieved when the sintering atmosphere was replaced with nitrogen. Owing to the existence of carbon generated by the carbonization of PVA in nitrogen at high temperature, the mixed structure of TiO₂ and carbon can help to weaken the membrane sintering stress which is caused by poor quality of the support surface and by mismatch of the thermal-expansion-coefficients of ceramic and metal. After the sintering of TiO₂ particle, the generated carbon can be removed by heat-treatment in air, resulting in a porous TiO₂/stainless-steel membrane. The membrane thickness and mean pore size are 10 μm and 0.21μm, respectively, and the corresponding nitrogen flux is 1.72 m³/(m²·h·kPa) at room temperature.

Key words: solid-state particle sintering, macroporous stainless-steel support, porous TiO2/stainless-steel membrane, sintering atmosphere, sintering stress

CLC Number:

TB321

WEI Lei, HUANG Yan. Preparation of Porous TiO₂/Stainless-steel Membranes by Carbon Assisted Solid-state Particle Sintering[J]. Journal of Inorganic Materials, 2015, 30(4): 427-431.

Figures/Tables 7

Fig. 1 SEM image of suface of the macroporous stainless- steel support

Fig. 2 Photographs of (a) M-0, (b) M-1 and (c) M-2

Fig. 3 Thermogravimetric analyses of PVA in air and in nitrogen

Fig. 4 Schematic of the carbon assisted solid-state particle sintering process

Fig. 5 Surface SEM images of (a) M-1 and (b) M-2, (c) cross-section SEM image of M-2

Fig. 6 XRD pattern of TiO2 membrane of sample M-2

Fig. 7 Pore size distribution of the samples of stainless-steel support, M-1 and M-2

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Preparation of Porous TiO₂/Stainless-steel Membranes by Carbon Assisted Solid-state Particle Sintering

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[1]	WEI Lei, YU Jian, HU Xiao-Juan, HUANG Yan. Buffering of the Sintering Stress for Fabrication of Microporous Al₂O₃/Stainless-steel Membranes [J]. Journal of Inorganic Materials, 2014, 29(4): 433-437.
[2]	QIU Ming-Hui,FENG Jun,FAN Yi-Qun,XU Nan-Ping. Stress Analysis in the Preparation of Bi-layer Membranes by Co-sintering Process [J]. Journal of Inorganic Materials, 2009, 24(3): 617-622.
[3]	HUANG Chuan-Yong,TANG Zi-Long,ZHANG Zhong-Tai. Structure and Property of Y and YF₃ Doped Barium Titanate [J]. Journal of Inorganic Materials, 2000, 15(4): 691-696.
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