Sol-gel processing and automation of tunable ceramic materials

1993 ◽  
Author(s):  
Fathi Selmi ◽  
Vasundara V. Varadan ◽  
B. Herner ◽  
Vijay K. Varadan
Keyword(s):  
Sol Gel ◽  
Ceramic Materials ◽  
Gel Processing

scholarly journals Silane Primers as Adhesion Promotors for Coatings

Proceedings ◽  
2019 ◽  
Vol 29 (1) ◽  
pp. 73
Author(s):  
François Perrin ◽  
Anthony Grard ◽  
Lénaïk Belec
Keyword(s):  
Low Temperatures ◽  
Sol Gel ◽  
Ceramic Materials ◽  
Soft Chemistry ◽  
Molecular Precursors ◽  
Chemistry Method ◽  
Gel Processing

Sol-gel processing is a soft-chemistry method to obtain ceramic materials at low temperatures starting from molecular precursors in solution. [...]

Sol-Gel Processing of Glasses and Glass-Ceramics for Microelectronic Packaging

1991 ◽  
Vol 249 ◽  
Author(s):  
M.A. Sriram ◽  
P.N. Kumta
Keyword(s):  
Dielectric Constant ◽  
Thermal Analyses ◽  
Sol Gel ◽  
Glass Ceramics ◽  
Signal Propagation ◽  
Ceramic Materials ◽  
X Ray Diffraction ◽  
Low Dielectric ◽  
Heat Treated ◽  
Gel Processing

In recent years considerable progress has been made in electronic packaging substrate technology. The future need of miniaturization of devices to increase the signal processing speeds calls for an increase in the device density requiring the substrates to be designed for better thermal, mechanical and electrical efficiency.Fast signal propagation with minimum delay requires the substrate to possess very low dielectric constant. Several glasses and glass-ceramic materials have been identified over the years which show good promise as candidate substrate materials. Among these borophosphate and borophosphosilicate glass-ceramics have been recently identified to have the lowest dielectric constant (3.8). Sol-gel processing has been used to synthesize borosilicate, borophosphosilicate and borophosphate glasses and glass-ceramics using inexpensive boron oxide and phosphorus pentoxide precursors. Preliminary results of the processing of these gels and the effect of volatility of boron alkoxide and its modification on the gel structure are described. X-ray diffraction, Differential thermal analyses and FTIR have been used to characterize the as-prepared and heat treated gels.

Sol-Gel Processing of Transparent MgAl2O4

1988 ◽  
Vol 121 ◽  
Author(s):  
Yuan-Fu Yu ◽  
Sangvavann Heng ◽  
Tai-Il Mah ◽  
Edward E. Hermes
Keyword(s):  
Sol Gel ◽  
Ceramic Materials ◽  
Metal Alkoxide ◽  
Solvent Ratio ◽  
Processing Conditions ◽  
Chemical Additives ◽  
Control Chemical ◽  
High Degree ◽  
Gel Processing ◽  
Hydrolysis Of

ABSTRACTHigh-purity, transparent monolithic spinel (MgAl2O4) was synthesized via the hydrolytic thermal decomposition of mixed alkoxide organo-metallic precursors. Several factors, such as the metal alkoxide concentration in various solvents, the water to solvent ratio, and the reaction temperatures affect the hydrolysis of the mixed alkoxides. These factors also influence the transparency of the resulting sols and gels. The degree of transparency of the sols and gels is also influenced by such factors as pH and drying control chemical additives. Variations in the processing conditions during drying, aging, and sintering of the gels produced ceramic materials with high degree of transparency.

Sol-Gel Strategies for Controlled Porosity Ceramic Materials: Thin Film and Bulk

1994 ◽  
Vol 368 ◽  
Author(s):  
C. Jeffrey Brinker ◽  
Rakesh Sehgal ◽  
Narayan K. Raman ◽  
Sai S. Prakash ◽  
Laurent Delatire
Keyword(s):  
Thin Film ◽  
Sol Gel ◽  
Ceramic Materials ◽  
Particle Packing ◽  
Membrane Reactors ◽  
Organic Templates ◽  
Controlled Porosity ◽  
Processing Techniques ◽  
Catalytic Membrane Reactors ◽  
Gel Processing

ABSTRACTUsing sol-gel processing techniques it is possible to vary the condensation pathway over wide ranges to form primary species ranging in structure from oligomers to polymers to particles. The porosity of the corresponding dry gels depends on the size and structure of the primary species, the organization of these structures, often by aggregation, to form a gel, and the collapse of the gel by drying. This paper reviews these ideas in the context of forming thin film or bulk specimens. Several strategies are introduced to control porosity on length scales of interest for catalysis and catalytic membrane reactors: 1) aggregation of fractals; 2) management of capillary pressure; 3) surface derivatization; 4) relative rates of condensation and evaporation; 5) the use of organic templates and 6) sintering. These strategies are contrasted with the more traditional particle packing approach to preparing controlled porosity materials.

Sol-gel and SPS combined synthesis of highly porous wollastonite ceramic materials with immobilized Au-NPs

2017 ◽  
Vol 43 (11) ◽  
pp. 8509-8516 ◽  
Author(s):  
E.K. Papynov ◽  
O.O. Shichalin ◽  
V.Yu. Mayorov ◽  
E.B. Modin ◽  
A.S. Portnyagin ◽  
...  
Keyword(s):  
Sol Gel ◽  
Ceramic Materials ◽  
Au Nps ◽  
Highly Porous

Synthesis and characterization of BaMgAl10O17:Eu phosphors derived by sol–gel processing

2002 ◽  
Vol 126 (2) ◽  
pp. 161-165 ◽  
Author(s):  
Junying Zhang ◽  
Zhongtai Zhang ◽  
Zilong Tang ◽  
Zishan Zheng ◽  
Yuanhua Lin
Keyword(s):  
Sol Gel ◽  
Synthesis And Characterization ◽  
Gel Processing

Chemical Solution Deposition of Lanthanum Zirconate Buffer Layers on Biaxially Textured Ni–1.7% Fe–3% W Alloy Substrates for Coated-conductor Fabrication

2002 ◽  
Vol 17 (6) ◽  
pp. 1543-1549 ◽  
Author(s):  
S. Sathyamurthy ◽  
M. Paranthaman ◽  
T. Aytug ◽  
B. W. Kang ◽  
P. M. Martin ◽  
...  
Keyword(s):  
Sol Gel ◽  
Rf Sputtering ◽  
Cube Texture ◽  
Dip Coating ◽  
Buffer Layers ◽  
Lanthanum Zirconate ◽  
Solution Deposition ◽  
Ybco Films ◽  
Current Densities ◽  
Gel Processing

Sol-gel processing of La2Zr2O7 (LZO) buffer layers on biaxially textured Ni–1.7% Fe–3% W alloy substrates using a continuous reel-to-reel dip-coating unit has been studied. The epitaxial LZO films obtained have a strong cube texture and uniform microstructure. The effects of increasing the annealing speed on the texture, microstructure, and carbon content retained in the film were studied. On top of the LZO films, epitaxial layers of yttria-stabilized zirconia and Ceria (CeO2) were deposited using rf sputtering, and YBa2Cu3Ox (YBCO) films were then deposited using pulsed laser deposition. Critical current densities (Jc) of 1.9 MA/cm2 at 77 K and self-field and 0.34 MA/cm2at 77 K and 0.5 T have been obtained on these films. These values are comparable to those obtained on YBCO films deposited on all-vacuum deposited buffer layers and the highest ever obtained using solution seed layers.

Effect of acetylacetone on the preparation of PZT materials in sol–gel processing

2002 ◽  
Vol 96 (3) ◽  
pp. 307-312 ◽  
Author(s):  
Luqian Weng ◽  
Xujin Bao ◽  
Kwesi Sagoe-Crentsil
Keyword(s):  
Sol Gel ◽  
Gel Processing
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