Erosion Behavior of Gelcast Fused Silica Ceramic Composites

Abstract Fused silica ceramics composites were widely using for the fabrication of radomes which is the vital component of a missile. The required properties were attained by the addition of small amounts of Silicon Nitride (Si3N4) to the fused silica for enhancing flexural strength and without disturbing the dielectric properties. In the present work, porous fused silica ceramic composites were fabricated using gelcasting process, a near net shaping technique. The experiments were conducted using Response Surface Methodology (RSM) central composite with face centered design with six centre points approach. The process parameters of gelcasting process such as solid loading, monomer ratio, monomer content and additive (Si3N4) were considered as input parameters and flexural strength, porosity and dielectric constant as response parameters. Single parameter and interaction parameter effect on responses were studied. The effectiveness of derived models was compared with Analysis of Variance (ANOVA) at 95% confidence level. Statistical analysis proven that input parameters have critical effect on responses. The derived RSM mathematical models have a higher R2 values (Flexural strength 97.62%, Porosity 95.12% and dielectric constant 95.93%) which shows the critical relation between actual and predicted values. The optimal responses obtained were flexural strength 86.173 MPa, porosity 39.767% and dielectric constant 6.949 corresponding parameters process parameters solid loading 47.95%, additive (Si3N4) 10.43 wt%, monomer content 15 wt% and monomer ratio 3.

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Response Surface Modeling and Optimization of Gelcast Fused Silica Micro Hybrid Ceramic Composites

Silicon ◽

10.1007/s12633-019-00247-w ◽

2019 ◽

Vol 12 (7) ◽

pp. 1513-1528 ◽

Cited By ~ 1

Author(s):

Gurabvaiah Punugupati ◽

P. S. C. Bose ◽

G. Raghavendra ◽

C. S. P. Rao

Keyword(s):

Response Surface ◽

Ceramic Composites ◽

Surface Modeling ◽

Fused Silica ◽

Response Surface Modeling ◽

Modeling And Optimization ◽

Hybrid Ceramic

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Effect of Carbothermal Reduction Nitriding of Si/SiO2 Composite Green on Properties of Fused Silica Ceramics

Nanoscience and Nanotechnology Letters ◽

10.1166/nnl.2020.3191 ◽

2020 ◽

Vol 12 (7) ◽

pp. 934-938

Author(s):

Liang Tian ◽

Qinglin Hou ◽

Yingxia Wang ◽

Yihui Hou ◽

Tao Chen

Keyword(s):

High Temperature ◽

Carbothermal Reduction ◽

Fused Silica ◽

Solid Content ◽

Nitrogen Compounds ◽

Green Body ◽

Nitriding Reaction ◽

Different Temperatures ◽

Silica Ceramic

Si/SiO2 composite green body with solid content of 50% was prepared by low toxic gel system and sintered in nitrogen at high temperature. Nitrogen compounds were synthesized in situ on fused silica ceramic substrate. The influence of different temperatures on nitriding reaction was discussed: different temperatures were used for nitriding at 1350 °C, 1400 °C, 1450 °C, 1500 °C. The effect of different nitriding times on nitriding reaction was discussed: different holding times were used for nitriding +1 h, 1.5 h, 2 h and 2.5 h. The best nitriding process was obtained by analyzing the composition, microstructure and properties of the nitrided samples.

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The effect of alumina contamination from the ball-milling of fused silica on the high temperature properties of injection moulded silica ceramic components

Journal of the European Ceramic Society ◽

10.1016/j.jeurceramsoc.2010.12.016 ◽

2011 ◽

Vol 31 (6) ◽

pp. 977-981 ◽

Cited By ~ 7

Author(s):

P.J. Wilson ◽

S. Blackburn ◽

R.W. Greenwood ◽

B. Prajapti ◽

K. Smalley

Keyword(s):

High Temperature ◽

Ball Milling ◽

Fused Silica ◽

High Temperature Properties ◽

Ceramic Components ◽

Silica Ceramic

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Novel magnetodielectric cobalt ferrite–titania–silica ceramic composites with tunable dielectric properties

Ceramics International ◽

10.1016/j.ceramint.2016.07.095 ◽

2016 ◽

Vol 42 (15) ◽

pp. 16650-16654

Author(s):

Pietro Galizia ◽

Davide Gardini ◽

Simona Ortelli ◽

Claudio Capiani ◽

Maksimas Anbinderis ◽

...

Keyword(s):

Dielectric Properties ◽

Cobalt Ferrite ◽

Ceramic Composites ◽

Silica Ceramic

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Influence of Al2O3 content on mechanical properties of silica-based ceramic cores prepared by stereolithography

Journal of Advanced Ceramics ◽

10.1007/s40145-021-0513-y ◽

2021 ◽

Author(s):

Wen Zheng ◽

Jia-Min Wu ◽

Shuang Chen ◽

Chang-Shun Wang ◽

Chun-Lei Liu ◽

...

Keyword(s):

Mechanical Properties ◽

High Temperature ◽

Flexural Strength ◽

Room Temperature ◽

Linear Shrinkage ◽

Fused Silica ◽

Al2o3 Content ◽

High Temperature Mechanical Properties ◽

Silica Ceramic ◽

Excellent Chemical

AbstractSilica ceramic cores have played an important part in the manufacture of hollow blades due to their excellent chemical stability and moderate high-temperature mechanical properties. In this study, silica-based ceramics were prepared with Al2O3 addition by stereolithography, and the influence of Al2O3 content on mechanical properties of the silica-based ceramics was investigated. The Al2O3 in silica-based ceramics can improve the mechanical properties by playing a role as a seed for the crystallization of fused silica into cristobalite. As a result, with the increase of Al2O3 content, the linear shrinkage of the silica-based ceramics first decreased and then increased, while the room-temperature flexural strength and the high-temperature flexural strength first increased and then decreased. As the Al2O3 content increased to 1.0 vol%, the linear shrinkage was reduced to 1.64% because of the blocked viscous flow caused by Al2O3. Meanwhile, the room-temperature flexural strength and the high-temperature flexural strength were improved to 20.38 and 21.43 MPa with 1.0 vol% Al2O3, respectively, due to the increased α-cristobalite and β-cristobalite content. Therefore, using the optimal content of Al2O3 in silica-based ceramics can provide excellent mechanical properties, which are suitable for the application of ceramic cores in the manufacturing of hollow blades.

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