Mechanical properties of silica aerogels measured by microindentation: influence of sol–gel processing parameters and carbon addition

2001 ◽  
Vol 285 (1-3) ◽  
pp. 244-250 ◽  
Author(s):  
M Moner-Girona ◽  
E Martı́nez ◽  
A Roig ◽  
J Esteve ◽  
E Molins
Keyword(s):  
Mechanical Properties ◽  
Sol Gel ◽  
Processing Parameters ◽  
Silica Aerogels ◽  
Carbon Addition ◽  
Gel Processing

Effect of sol-gel processing parameters on thermal properties of silica aerogels

1997 ◽  
Vol 49 (2) ◽  
pp. 129-134 ◽  
Author(s):  
D. Haranath ◽  
G.M. Pajonk ◽  
P.B. Wagh ◽  
A. Venkateswara Rao
Keyword(s):  
Thermal Properties ◽  
Sol Gel ◽  
Processing Parameters ◽  
Silica Aerogels ◽  
Gel Processing

Influence of sol-gel processing parameters on the ultrasonic sound velocities in silica aerogels

1997 ◽  
Vol 32 (8) ◽  
pp. 1079-1089 ◽  
Author(s):  
D. Haranath ◽  
P.B. Wagh ◽  
G.M. Pajonk ◽  
A.Venkateswara Rao
Keyword(s):  
Sol Gel ◽  
Processing Parameters ◽  
Silica Aerogels ◽  
Ultrasonic Sound ◽  
Gel Processing ◽  
Sound Velocities

Diamond Machinable Sol-Gel Silica Based Hybrid Coatings for High Precision Optical Molds

2010 ◽  
Vol 438 ◽  
pp. 65-72 ◽  
Author(s):  
Andreas Mehner ◽  
Ju An Dong ◽  
Timo Hoja ◽  
Torsten Prenzel ◽  
Yildirim Mutlugünes ◽  
...  
Keyword(s):  
Injection Molding ◽  
High Precision ◽  
Sol Gel ◽  
Processing Parameters ◽  
Hybrid Coatings ◽  
Optical Elements ◽  
Optical Components ◽  
New Approach ◽  
Free Silica ◽  
Gel Processing

The demand for high precision optical elements as micro lens arrays for displays increases continually. Economic mass production of such optical elements is done by replication with high precision optical molds. A new approach for manufacturing such molds was realized by diamond machinable and wear resistant sol-gel coatings. Crack free silica based hybrid coatings from base catalyzed sols from tetraethylorthosilicate (TEOS: Si(OC2H5)4) and methyltriethoxysilane (MTES: Si(CH3)(OC2H5)3) precursors were deposited onto pre-machined steel molds by spin coating process followed by a heat treatment at temperatures up to 800°C. Crack-free multilayer coatings with a total thickness of up to 18 µm were achieved. Micro-machining of these coatings was accomplished by high precision fly cutting with diamond tools. Molds with micro-structured coatings were successfully tested for injection molding of PMMA optical components. The wear resistance of the coatings was successfully tested by injection molding of 1000 PMMA lenses. Hardness and elastic modulus of the coatings were measured by nano indentation. The chemical composition was measured by X-ray photo electron spectroscopy (XPS) as a function of the sol-gel processing parameters.

Apatite-forming ability and mechanical properties of PTMO-modified CaO–SiO2 hybrids prepared by sol–gel processing: effect of CaO and PTMO contents

Biomaterials ◽  
2002 ◽  
Vol 23 (14) ◽  
pp. 3033-3040 ◽  
Author(s):  
Noboru Miyata ◽  
Ken-ichi Fuke ◽  
Qi Chen ◽  
Masakazu Kawashita ◽  
Tadashi Kokubo ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Sol Gel ◽  
Processing Effect ◽  
Gel Processing

Apatite-forming ability and mechanical properties of PTMO-modified CaO–SiO2–TiO2 hybrids derived from sol–gel processing

Biomaterials ◽  
2004 ◽  
Vol 25 (1) ◽  
pp. 1-7 ◽  
Author(s):  
Noboru Miyata ◽  
Ken-ichi Fuke ◽  
Qi Chen ◽  
Masakazu Kawashita ◽  
Tadashi Kokubo ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Sol Gel ◽  
Gel Processing

scholarly journals Study on process development and property evaluation of sol-gel derived magnesia stabilized zirconia minispheres

2014 ◽  
Vol 32 (2) ◽  
pp. 145-156 ◽  
Author(s):  
J. Judes ◽  
V. Kamaraj
Keyword(s):  
Mechanical Properties ◽  
Process Development ◽  
Sintering Temperature ◽  
Sol Gel ◽  
Processing Parameters ◽  
Processing Technique ◽  
Density Variation ◽  
Phase Identification ◽  
Stabilized Zirconia ◽  
Grinding Media

AbstractIn order to overcome limitations in the processing parameters of powder compaction method, a novel processing technique based on sol-gel route has been developed to produce near-net-shaped prototype fine zirconia minispheres with required properties that could potentially be used as grinding media. Impact of magnesia concentration and sintering temperature on the final product has been analyzed in detail. Zirconia minispheres have been characterized to establish a correlation between physical, structural and mechanical properties. Sintering temperature, soaking period, heating rate and viscosity of the sol apparently influence the characteristics of the magnesia stabilized zirconia minispheres. The phase identification, density variation, chemical decomposition, functional group specification, surface area, porosity, shrinkage and microstructural features of the dried and sintered final product have been studied. It has been observed that magnesia content, sintering temperature, density and the grain size of the sintered minispheres have a significant impact on the mechanical properties of the final product.

scholarly journals Effect of sol-gel processing parameters on structure of zirconia

Cerâmica ◽  
2019 ◽  
Vol 65 (suppl 1) ◽  
pp. 17-21 ◽  
Author(s):  
D. G. da Silva ◽  
W. L. Vasconcelos
Keyword(s):  
Sol Gel ◽  
Processing Parameters ◽  
Gel Processing

scholarly journals The Use of Carbon Nanotubes to Reinforce 45S5 Bioglass-Based Scaffolds for Tissue Engineering Applications

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
R. Touri ◽  
F. Moztarzadeh ◽  
Z. Sadeghian ◽  
D. Bizari ◽  
M. Tahriri ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Tissue Engineering ◽  
Elastic Modulus ◽  
Sol Gel ◽  
Casting Process ◽  
Multiwall Carbon Nanotube ◽  
Filling Material ◽  
45S5 Bioglass ◽  
Gel Processing

Bioglass has been used for bone-filling material in bone tissue engineering, but its lean mechanical strength limits its applications in load-bearing positions. Carbon nanotubes (CNTs), with their high aspect ratio and excellent mechanical properties, have the potential to strengthen and toughen bioactive glass material without offsetting its bioactivity. Therefore, in this research, multiwall carbon nanotube (MWCNT)/45S5 Bioglass composite scaffolds have been successfully prepared by means of freeze casting process. 45S5 Bioglass was synthesized by the sol-gel processing method. The obtained material was characterized with X-ray powder diffraction (XRD). The mechanical properties of the scaffolds, such as compression strength and elastic modulus, were measured. Finally, compared with the scaffolds prepared by 100% 45S5 Bioglass powders, the addition of 0.25 wt.% MWCNTs increases the compressive strength and elastic modulus of 45S5 Bioglass scaffolds from 2.08 to 4.56 MPa (a 119% increase) and 111.50 to 266.59 MPa (a 139% increase), respectively.

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