Optimization of preparation process and characterization for hydrophobic α-Al2O3 ceramic membrane

This study is to investigate tribological behavior of brake lining materials by hot pressing commercial friction powders with ceramic powders prepared by TEOS / boehmite sol-gel. The stoichiometric ratios of TEOS / boehmite sol-gel were kept constant but calcinated at different temperature to fabricate different homemade ceramic powders. The various phases of ceramic powders such as γ-Al2O3, δ-Al2O3, θ-Al2O3, α-Al2O3, cristobalite and mullite were formed during the preparation process starting from TEOS / boehmite sol-gel solution. The XRD observations reveal the final compositions of these homemade powders were strongly related to the calcining temperature. The brake lining specimens made from TEOS / boehmite sol-gel calcinated at higher temperature show better tribological performance. The brake lining specimen with α-Al2O3 and mullite which were transformed from TEOS / boehmite sol-gel calcinated at 1300°C shows the most stable friction coefficient and the lowest mass loss during wear tests.

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Fabrication of a COF-5 membrane on a functionalized α-Al2O3 ceramic support using a microwave irradiation method

Chemical Communications ◽

10.1039/c3cc48065h ◽

2014 ◽

Vol 50 (12) ◽

pp. 1462-1464 ◽

Cited By ~ 39

Author(s):

Dandan Hao ◽

Jinna Zhang ◽

Hui Lu ◽

Wenguang Leng ◽

Rile Ge ◽

...

Keyword(s):

Microwave Irradiation ◽

Microwave Irradiation Method ◽

Al2o3 Ceramic ◽

Ceramic Support ◽

Membrane Growth ◽

Α Al2o3

A novel functionalization strategy was developed by using covalent linkers to promote the COF-5 membrane growth on the α-Al2O3 support.

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Research on Molding for Al2O3Ceramic Substrate and its Processing Technic

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.154-155.1397 ◽

2010 ◽

Vol 154-155 ◽

pp. 1397-1400

Author(s):

Zhan Xin Zhang ◽

Hong Kui Hu ◽

Feng Ming Wang ◽

Tao Liu

Keyword(s):

Ph Value ◽

Glass Mold ◽

Ceramic Substrate ◽

Al2o3 Powder ◽

Al2o3 Ceramic ◽

Α Al2o3

By adopting technique for forming colloid to manufacture Al2O3 Ceramic Substrate, the effect of aggregation reaction which is caused by pH value, temperature for shaping, evocating agent and some other factors of slurry has been researched in the processes for shaping Substrate. The result addresses that the substrate with well-proportioned in density, contractibility and over 78MPa intensity is able to be made while the pH is about 9, the temperature is between 60 and 70°, the shaping duration is no more than 30 minutes, in glass mold, and with 120 item undersize α-Al2O3 powder. To dunk the desiccating substrate for 20 minutes, it would gain the good flexibility, moreover, it is able to be cut. After it is desiccated again, it becomes firm again, this kind of characteristic can be repeated numbers of times.

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Preparation and Properties of Al2O3 Ceramic Reinforced Mo-Based Composites by Al(NO3)3 Precursor

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.150-151.1077 ◽

2010 ◽

Vol 150-151 ◽

pp. 1077-1081

Author(s):

Liu Jie Xu ◽

Shi Zhong Wei ◽

Guo Shang Zhang ◽

Ji Wen Li ◽

Xiang Dong Ma ◽

...

Keyword(s):

Raw Materials ◽

Alumina Content ◽

Wear Property ◽

Micro Hardness ◽

Ceramic Particles ◽

Al2o3 Ceramic ◽

Molybdenum Alloys ◽

Α Al2o3 ◽

Worn Surface ◽

Wear Characterization

To enhance the wear resistance of molybdenum alloys, Mo-based composites reinforced by Al2O3 ceramic particles were developed. Using Al(NO3)3 aqueous solution and MoO3 as raw materials, the Molybdenum powders mixed with Al2O3 particles were prepared by liquid-solid incorporation, drying, pyrolysis of Al(NO3)3 and deoxidation of MoO3 by H2. And then the Mo-based composites with 3-10vol.% Alumina were prepared by compaction and sintering at 1840°C. The morphology of the Molybdenum powder and microstructure of the composites were analyzed by SEM and XRD. The micro-hardness, density and wear property of composites were researched. The results showed that α-Al2O3 ceramic particles and Molybdenum matrix compose the composites. With the increase of Alumina content, the molybdenum powders become fine and rule, the grains of composites become fine, the microhardness of Molybdenum matrix increases, and the density first increases and then decreases. The friction coefficient of composite is scarcely affected by the alumina content. While the wear weight of the composite decrease with the increase of Alumina content. There are obvious plow furrow and abrasive dust on the worn surface, showing the abrasive wear characterization.

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Mesoporous MCM-48 silica membrane synthesized on a large-pore α-Al2O3 ceramic tube

Journal of Membrane Science ◽

10.1016/j.memsci.2006.10.029 ◽

2007 ◽

Vol 287 (1) ◽

pp. 6-8 ◽

Cited By ~ 16

Author(s):

C LIU ◽

J WANG ◽

Z RONG

Keyword(s):

Silica Membrane ◽

Al2o3 Ceramic ◽

Ceramic Tube ◽

Large Pore ◽

Α Al2o3

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In Situ Synthesis of Rod-Like Tielite / Alumina Ceramic Composites via Mechanical Activation

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.352.111 ◽

2007 ◽

Vol 352 ◽

pp. 111-114

Author(s):

Xiao Hu Chen ◽

Xiao Min Chen ◽

Huang Zhao ◽

Ji Huai Wu

Keyword(s):

Composite Materials ◽

Mechanical Activation ◽

Ceramic Composite ◽

Ceramic Composites ◽

Al2o3 Ceramic ◽

Longitudinal Length ◽

In Situ Formation ◽

Ceramic Composite Materials ◽

Α Al2o3

The purpose of this paper is to investigate the possibility of rod-like Al2TiO5 / α-Al2O3 composites in situ formation via a mechanical activation process. A QM-ISP-4 Planetary Mill was employed to activate mechanically the mixtures of anatase and corundum in air at room temperature for different times. The milled powder mixtures were pressed into platelets and then sintered in air at 1300°C for 3 h. The XRD results showed that only Al2TiO5 and α-Al2O3 phases could be detected in the sintered samples when the activated time reached 30 hours. The SEM observations illustrated the unusual microstructure of Al2TiO5 / α-Al2O3 ceramic composite materials. Abnormal grains with longitudinal length ~10 μm23 transversal length ~1 μm and equiaxed matrix grains of ~3 μm on an average were observed. EDXA proved that the rod-like grains and the fine equiaxed matrix grains were composed of Al2TiO5 and α-Al2O3, separately. The roles of anisotropic grain growth caused by mechanical activation are discussed for the in situ formation of rod-like Al2TiO5 / α-Al2O3 ceramic composite materials.

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