Fabrication and Characterization of Porous Mullite Coating on Porous Silicon Carbide Support

Mullite powders of stoichiometric composition were synthesized by sol-gel process with TEOS and Al(NO3)3·9H2O as silicon and aluminum source. Homogeneous mullite powders were used as the starting materials to prepare the porous mullite coating on the porous silicon carbide support by repeated dip-coating method. XRD analysis revealed that the mullite precursor gels almost completely transformed to orthorhombic crystalline mullite at 1200°C. The average pore diameter and porosity of the porous mullite coating were about 4.5µm and 52.3%, respectively.

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Fabrication and Characterization of Porous Mullite Coating on Porous Silicon Carbide Support

High-Performance Ceramics III - Key Engineering Materials ◽

10.4028/0-87849-959-8.1301 ◽

2007 ◽

pp. 1301-1304

Author(s):

Ning Wang ◽

Xiao Zhan Yang ◽

Jian Bao Li ◽

Hong Lin ◽

Bo Chi

Keyword(s):

Silicon Carbide ◽

Porous Silicon ◽

Porous Silicon Carbide ◽

Mullite Coating ◽

Porous Mullite ◽

Fabrication And Characterization

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Synthesis of High Surface Area Porous Silicon Carbide by Employing Soft Template in the Sol-Gel Process

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.148-149.1629 ◽

2010 ◽

Vol 148-149 ◽

pp. 1629-1633

Author(s):

Dong Hua Wang ◽

Xin Fu

Keyword(s):

Silicon Carbide ◽

Porous Silicon ◽

Surface Area ◽

High Surface ◽

Sol Gel ◽

High Surface Area ◽

Silica Xerogel ◽

Porous Silicon Carbide ◽

Gel Method ◽

Sol Gel Process

High surface area porous silicon carbide was synthesized by a modified sol-gel method. In the sol-gel method, furfuryl alcohol and tetraethoxysilane were used respectively as carbon and silicon precursors for preparing a carbonaceous silica xerogel. Polymethylhydrosiloxane (PMHS) was employed as pore-adjusting agent in the sol-gel process. SiC was obtained by the carbothermal reduction of the carbonaceous silica xerogel at 1300 oC in argon flow and then purified by removing excess silica, carbon and other impurities. XRD、FTIR、SEM、HRTEM and BET were used to characterize the SiC samples. The results show that the SiC products are found to have high specific surface area of 135 m2 /g. PMHS has important effect on the surface area, pore volume of the SiC products. It is therefore suggested that PMHS plays the role of structure-directing agent that enhances the production of mesoporous pores in the SiC products.

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Synthesis of High Surface Area Porous Silicon Carbide by a Modified Sol-Gel Method

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.194-196.562 ◽

2011 ◽

Vol 194-196 ◽

pp. 562-565

Author(s):

Dong Hua Wang ◽

Xin Fu

Keyword(s):

Silicon Carbide ◽

Porous Silicon ◽

Surface Area ◽

High Surface ◽

Sol Gel ◽

High Surface Area ◽

Porous Silicon Carbide ◽

Gel Method ◽

Sol Gel Method ◽

Sol Gel Process

High surface area porous silicon carbide was synthesized by employing polymethylhydrosiloxane (PMHS) as soft template in the sol-gel process. In the sol-gel method, furfuryl alcohol and tetraethoxysilane were used respectively as carbon and silicon precursors for preparing a carbonaceous silica xerogel. PMHS was employed as pore-adjusting agent in the sol-gel process. The puriﬁed SiC sample was characterized by XRD、FTIR、SEM、HRTEM and BET. The results show that the SiC products are found to have high specific surface area of 125 m2 /g and an average pore diameter of about 17 nm. PMHS has important effect on the surface area of the SiC products.

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The role of polymethylhydrosiloxane in the sol-gel synthesis of high surface area porous silicon carbide

International Journal of Materials Research (formerly Zeitschrift fuer Metallkunde) ◽

10.3139/146.110601 ◽

2011 ◽

Vol 102 (11) ◽

pp. 1408-1414 ◽

Cited By ~ 2

Author(s):

Dong-Hua Wang ◽

Xin Fu ◽

Guo-Qiang Jin ◽

Xiang-Yun Guo

Keyword(s):

Silicon Carbide ◽

Porous Silicon ◽

Surface Area ◽

High Surface ◽

Sol Gel ◽

High Surface Area ◽

Porous Silicon Carbide ◽

Sol Gel Synthesis

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Aqueous Sol-Gel Synthesis of Different Iron Ferrites: From 3D to 2D

Materials ◽

10.3390/ma14061554 ◽

2021 ◽

Vol 14 (6) ◽

pp. 1554

Author(s):

Justinas Januskevicius ◽

Zivile Stankeviciute ◽

Dalis Baltrunas ◽

Kęstutis Mažeika ◽

Aldona Beganskiene ◽

...

Keyword(s):

Magnetic Measurements ◽

Substrate Surface ◽

Sol Gel ◽

Synthesis Method ◽

Xrd Analysis ◽

Dip Coating ◽

Yttrium Iron ◽

Iron Garnet ◽

Dip Coating Technique ◽

Sol Gel Synthesis

In this study, an aqueous sol-gel synthesis method and subsequent dip-coating technique were applied for the preparation of yttrium iron garnet (YIG), yttrium iron perovskite (YIP), and terbium iron perovskite (TIP) bulk and thin films. The monophasic highly crystalline different iron ferrite powders have been synthesized using this simple aqueous sol-gel process displaying the suitability of the method. In the next step, the same sol-gel solution was used for the fabrication of coatings on monocrystalline silicon (100) using a dip-coating procedure. This resulted, likely due to substrate surface influence, in all coatings having mixed phases of both garnet and perovskite. Thermogravimetric (TG) analysis of the precursor gels was carried out. All the samples were investigated by X-ray powder diffraction (XRD) analysis. The coatings were also investigated by scanning electron microscopy (SEM), atomic force microscopy (AFM) and Mössbauer spectroscopy. Magnetic measurements were also carried out.

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