Rational Design and Porosity of Porous Alumina Ceramic Membrane for Air Bearing

Air bearing has been widely applied in ultra-precision machine tools, aerospace and other fields. The restrictor of the porous material is the key component in air bearings, but its performance is limited by the machining accuracy. A combination of optimization design and material modification of th...

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Autores principales:	Jianzhou Du, Duomei Ai, Xin Xiao, Jiming Song, Yunping Li, Yuansheng Chen, Luming Wang, Kongjun Zhu
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	porous alumina ceramics inorganic membranes porosity modeling air bearing Chemical technology TP1-1185 Chemical engineering TP155-156
Acceso en línea:	https://doaj.org/article/be3e227740b04b5fbf17118a6f9720a0
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spelling	oai:doaj.org-article:be3e227740b04b5fbf17118a6f9720a02021-11-25T18:19:57ZRational Design and Porosity of Porous Alumina Ceramic Membrane for Air Bearing10.3390/membranes111108722077-0375https://doaj.org/article/be3e227740b04b5fbf17118a6f9720a02021-11-01T00:00:00Zhttps://www.mdpi.com/2077-0375/11/11/872https://doaj.org/toc/2077-0375Air bearing has been widely applied in ultra-precision machine tools, aerospace and other fields. The restrictor of the porous material is the key component in air bearings, but its performance is limited by the machining accuracy. A combination of optimization design and material modification of the porous alumina ceramic membrane is proposed to improve performance within an air bearing. Porous alumina ceramics were prepared by adding a pore-forming agent and performing solid-phase sintering at 1600 °C for 3 h, using 95-Al<sub>2</sub>O<sub>3</sub> as raw material and polystyrene microspheres with different particle sizes as the pore-forming agent. With 20 wt.% of PS50, the optimum porous alumina ceramic membranes achieved a density of 3.2 g/cm<sup>3</sup>, a porosity of 11.8% and a bending strength of 150.4 MPa. Then, the sintered samples were processed into restrictors with a diameter of 40 mm and a thickness of 5 mm. After the restrictors were bonded to aluminum shells for the air bearing, both experimental and simulation work was carried out to verify the designed air bearing. Simulation results showed that the load capacity increased from 94 N to 523 N when the porosity increased from 5% to 25% at a fixed gas supply pressure of 0.5 MPa and a fixed gas film thickness of 25 μm. When the gas film thickness and porosity were fixed at 100 μm and 11.8%, respectively, the load capacity increased from 8.6 N to 40.8 N with the gas supply pressure having been increased from 0.1 MPa to 0.5 MPa. Both experimental and simulation results successfully demonstrated the stability and effectiveness of the proposed method. The porosity is an important factor for improving the performance of an air bearing, and it can be optimized to enhance the bearing’s stability and load capacity.Jianzhou DuDuomei AiXin XiaoJiming SongYunping LiYuansheng ChenLuming WangKongjun ZhuMDPI AGarticleporous alumina ceramicsinorganic membranesporositymodelingair bearingChemical technologyTP1-1185Chemical engineeringTP155-156ENMembranes, Vol 11, Iss 872, p 872 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	porous alumina ceramics inorganic membranes porosity modeling air bearing Chemical technology TP1-1185 Chemical engineering TP155-156
spellingShingle	porous alumina ceramics inorganic membranes porosity modeling air bearing Chemical technology TP1-1185 Chemical engineering TP155-156 Jianzhou Du Duomei Ai Xin Xiao Jiming Song Yunping Li Yuansheng Chen Luming Wang Kongjun Zhu Rational Design and Porosity of Porous Alumina Ceramic Membrane for Air Bearing
description	Air bearing has been widely applied in ultra-precision machine tools, aerospace and other fields. The restrictor of the porous material is the key component in air bearings, but its performance is limited by the machining accuracy. A combination of optimization design and material modification of the porous alumina ceramic membrane is proposed to improve performance within an air bearing. Porous alumina ceramics were prepared by adding a pore-forming agent and performing solid-phase sintering at 1600 °C for 3 h, using 95-Al<sub>2</sub>O<sub>3</sub> as raw material and polystyrene microspheres with different particle sizes as the pore-forming agent. With 20 wt.% of PS50, the optimum porous alumina ceramic membranes achieved a density of 3.2 g/cm<sup>3</sup>, a porosity of 11.8% and a bending strength of 150.4 MPa. Then, the sintered samples were processed into restrictors with a diameter of 40 mm and a thickness of 5 mm. After the restrictors were bonded to aluminum shells for the air bearing, both experimental and simulation work was carried out to verify the designed air bearing. Simulation results showed that the load capacity increased from 94 N to 523 N when the porosity increased from 5% to 25% at a fixed gas supply pressure of 0.5 MPa and a fixed gas film thickness of 25 μm. When the gas film thickness and porosity were fixed at 100 μm and 11.8%, respectively, the load capacity increased from 8.6 N to 40.8 N with the gas supply pressure having been increased from 0.1 MPa to 0.5 MPa. Both experimental and simulation results successfully demonstrated the stability and effectiveness of the proposed method. The porosity is an important factor for improving the performance of an air bearing, and it can be optimized to enhance the bearing’s stability and load capacity.
format	article
author	Jianzhou Du Duomei Ai Xin Xiao Jiming Song Yunping Li Yuansheng Chen Luming Wang Kongjun Zhu
author_facet	Jianzhou Du Duomei Ai Xin Xiao Jiming Song Yunping Li Yuansheng Chen Luming Wang Kongjun Zhu
author_sort	Jianzhou Du
title	Rational Design and Porosity of Porous Alumina Ceramic Membrane for Air Bearing
title_short	Rational Design and Porosity of Porous Alumina Ceramic Membrane for Air Bearing
title_full	Rational Design and Porosity of Porous Alumina Ceramic Membrane for Air Bearing
title_fullStr	Rational Design and Porosity of Porous Alumina Ceramic Membrane for Air Bearing
title_full_unstemmed	Rational Design and Porosity of Porous Alumina Ceramic Membrane for Air Bearing
title_sort	rational design and porosity of porous alumina ceramic membrane for air bearing
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/be3e227740b04b5fbf17118a6f9720a0
work_keys_str_mv	AT jianzhoudu rationaldesignandporosityofporousaluminaceramicmembraneforairbearing AT duomeiai rationaldesignandporosityofporousaluminaceramicmembraneforairbearing AT xinxiao rationaldesignandporosityofporousaluminaceramicmembraneforairbearing AT jimingsong rationaldesignandporosityofporousaluminaceramicmembraneforairbearing AT yunpingli rationaldesignandporosityofporousaluminaceramicmembraneforairbearing AT yuanshengchen rationaldesignandporosityofporousaluminaceramicmembraneforairbearing AT lumingwang rationaldesignandporosityofporousaluminaceramicmembraneforairbearing AT kongjunzhu rationaldesignandporosityofporousaluminaceramicmembraneforairbearing
_version_	1718411343969648640

Rational Design and Porosity of Porous Alumina Ceramic Membrane for Air Bearing

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