Preparation of Mullite-Aluminum Titanate-Cordierite Multiphase Ceramics

2013 ◽  
Vol 750-752 ◽  
pp. 484-487
Author(s):  
Ying Na Zhao ◽  
Gang Chang ◽  
Gang Liu ◽  
Hai Bo Song ◽  
Wen Li Zhang
Keyword(s):  
Composite Materials ◽  
Flexural Strength ◽  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Volume Density ◽  
High Alumina ◽  
Aluminum Titanate ◽  
Sinter Property ◽  
Shock Resistance ◽  
Multiphase Ceramics

Mullite-aluminum titanate-cordierite multiphase ceramics were prepared by high alumina clinker, Aluminum Titanate and Cordierite. The sintering property and thermal shock resistance of composite materials were tested. The experimental results show that the sinter property and themal shock resistance of Mullite-aluminum titanate-cordierite multiphase ceramics are relatively preferably, which the materials composition are 30 wt.% high alumina clinker, 60 wt.% cordierite and 10 wt.% aluminum titanate. The component samples show porosity of 33.17%, volume density 1.9 % and normal temperature flexural strength 20.66 MPa. Thermal residual flexural strength of the samples is still as high as 10.29 Mpa by 5 times thermal residual tests, and there are only little flexural strength lower after three times earthquake test.

Effect of SiC on Microstructures and Properties of Cordierite-Mullite Multiphase Ceramics Material

2009 ◽  
Vol 620-622 ◽  
pp. 33-36
Author(s):  
Jian Guang Bai ◽  
Bo Wang ◽  
Guang Liang Liu ◽  
Ji Qiang Gao ◽  
Jian Feng Yang ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Electron Microscope ◽  
Flexural Strength ◽  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Fused Silica ◽  
Fracture Surface Morphology ◽  
Shock Resistance ◽  
Scanning Electron ◽  
Multiphase Ceramics

In this paper, cordierite-mullite multiphase ceramics material was prepared using cordierite powder, mullite particles, fused silica, magnesia and alumina as main starting material. Effects of addition of 2%~10% SiC on the thermal expansion, flexural strength and thermal shock resistance were studied, and the fracture surface morphology was observed with Scanning Electron Microscope (SEM). The results showed that the multiphase ceramics material’s thermal expansion coefficient and flexural strength had little change. The thermal shock resistance of cordierite-mullite multiphase ceramics material varied as increasing-decreasing with the increase of SiC content, when the content of SiC was as high as 4%, the highest conservation rate of the flexural strength after 1100°C~water(3 times) was 72.08%, and the thermal shock resistance of cordierite-mullite multiphase ceramics material was superior.

Development of Aluminum Titanate-Mullite Composite Having High Thermal Shock Resistance

1986 ◽  
Vol 69 (10) ◽  
pp. C-226-C-227 ◽  
Author(s):  
Hiroyuki Morishima ◽  
Zenji Kato ◽  
Keizo Uematsu ◽  
Katsukazu Saito ◽  
Toyohiko Yano ◽  
...  
Keyword(s):  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Aluminum Titanate ◽  
Shock Resistance ◽  
High Thermal Shock Resistance

Effect of AlF3 Content on Microstructure and Properties of Mullite/Al2O3 Composite Ceramics

2018 ◽  
Vol 922 ◽  
pp. 62-67
Author(s):  
Ke Zheng Sang ◽  
Fan Wang ◽  
De Jun Zeng ◽  
Hong Wei Li
Keyword(s):  
Fracture Toughness ◽  
Flexural Strength ◽  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Diameter Ratio ◽  
Pressureless Sintering ◽  
Composite Ceramics ◽  
Microstructure And Properties ◽  
Shock Resistance ◽  
Mullite Whiskers

To reinforce the mullite/Al2O3 composite ceramics through formation of mullite whiskers, the composite ceramics were prepared by pressureless sintering using different AlF3 content. The microstructure, porosity, fracture toughness and thermal shock resistance of the composite ceramics were investigated. The results show that the addition of AlF3 can promote the mullite whisker formations, and the whiskers with the size of 3～10μm in diameter and a length-diameter ratio of 10～15 are obtained by sintering at 1600°C with the AlF3 content of 5wt%. Fracture toughness and thermal shock resistance of the composite ceramics are improved by the formation of mullite whisker. The fracture toughness of 4.79MPa•m1/2 can be obtained, and the 95.18% flexural strength remained after thermal shock.

Preparation and Performance of β-Sialon Bonded ZrO2 Composites

2011 ◽  
Vol 415-417 ◽  
pp. 138-141
Author(s):  
Rui Sheng Wang ◽  
Jun Hong Zhao ◽  
Ying Na Wei ◽  
Fu Hua Peng ◽  
Heng Yong Wei
Keyword(s):  
Thermal Expansion ◽  
Flexural Strength ◽  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Reaction Sintering ◽  
Sintering Process ◽  
Carbon Addition ◽  
Shock Resistance ◽  
And Performance ◽  
Sialon Powder

β-Sialon bonded ZrO2 composites were prepared by reaction sintering process using β-Sialon and CaO stabilized ZrO2 powders as raw materials.The effect of β-Sialon powder additions on the properties of the composites was investigated. The results show that the samples with 10 wt% of β-Sialon addition had the lowest apparent porosity (29.80%) and the highest of flexural strength (68.70MPa). The thermal shock resistance in carbon addition of the composites could be improved by addtion of 5wt% β-Sialon. It may be relative with that the sample had the lowest thermal expansion coefficient in vacuum.

Improvement in the Thermal Shock Resistance of Zirconia Ceramic by the Addition of Aluminium Titanate

2011 ◽  
Vol 194-196 ◽  
pp. 1724-1727 ◽  
Author(s):  
Heng Yong Wei ◽  
Li Xue Yu ◽  
Zhi Fa Wang ◽  
Jing Long Bu ◽  
Shu Long Ma ◽  
...  
Keyword(s):  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Bending Strength ◽  
Sem Analysis ◽  
Precipitation Method ◽  
Zirconia Ceramic ◽  
Aluminum Titanate ◽  
Sintering Properties ◽  
Shock Resistance ◽  
Co Precipitation

ZrO2-Al2TiO5 composite materials with high bending strength and good thermal shock resistance expansion were prepared using partially stabilized zirconia (Y-PSZ) powders coated with Al2TiO5 by co-precipitation method. The effects of Al2TiO5 content on the sintering properties, phase composition, microstructure and thermal shock resistance of the zirconia ceramic were investigated．The results show that the apparent porosity of the samples decreased and their bending strength increased with the content of aluminum titanate increasing from 0 to 8 wt%. The samples with 5 and 8 wt% aluminum titanate addtion have excellent thermal shock resistance. The results showed that the addtion of aluminum titanate could enhance the mechanical strength and improve the thermal shock resistance of zirconia ceramic. The XRD and SEM analysis results indicated that the propriety improvement is relative with the change of the microstructure and the increase of tetragonal ZrO2 phase in the composites.

Experimental Investigation on Throat Insert’s Thermal Shock Resistance Using C/C Composite in Solid Rocket Motor

2011 ◽  
Vol 304 ◽  
pp. 169-174 ◽  
Author(s):  
Xiang Geng Wei ◽  
Jiang Li ◽  
Jian Chen ◽  
Wei Jin
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Rocket Motor ◽  
Test Method ◽  
Woven Fabric ◽  
Solid Rocket Motor ◽  
Full Size ◽  
Shock Resistance

To provide the test method for thermal shock resistance of throat insert material in rocket motor design, an experimental method with a SRM of scale down was developed to simulate the thermal load of full-size rocket motor’s throat insert. The test guaranteed the consistency of propellant、chamber pressure 、rate of ignition pressurization and the contour of the surface of throat insert with full-size rocket motor, and make a compromise of condition of throat insert at the same time. This method had well reappearance of the fracture failure of throat insert of a full-size rocket motor, which proved the feasibility of the test method to a certain extent. A comparison test for thermal shock resistance of two different composite materials was carried out. The experimental results indicate that two reserve C/C composite materials had good thermal shock resistance than three directions woven C/C composite material which used in the motor of failure, and the performance of carbon fabric pierced C/C composite material was better than no woven fabric pierced C/C composite material in some sort.

Effect of MgTi2O5 Addition on Thermal Shock Resistance of Al2TiO5

2007 ◽  
Vol 280-283 ◽  
pp. 1187-1190 ◽  
Author(s):  
Qiang Shen ◽  
Yong Hu ◽  
Chuan Bin Wang ◽  
Ming Zhong Li ◽  
Lian Meng Zhang
Keyword(s):  
Solid Solution ◽  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Experimental Results ◽  
Aluminum Titanate ◽  
Shock Resistance

In the present paper, magnesium dititanate (MgTi2O5, M2T) was introduced into aluminum titanate (Al2TiO5, AT) to form AT-M2T solid solution so that the thermal shock resistance of Al2TiO5 could be kept still good while without any decomposition. The effect of MgTi2O5 addition on thermal shock resistance of Al2TiO5 was investigated. The experimental results showed that the thermal shock resistance of Al2TiO5 began to decrease when a little amount of MgTi2O5 was added and then rose with the continuous addition of MgTi2O5, even overrunning that of pure Al2TiO5 when 30mol% MgTi2O5 was contained. It was found that fine solid solution was formed between Al2TiO5 and MgTi2O5, which enhanced the thermal shock resistance of Al2TiO5.

Evaluation of Thermal Shock Resistance of Alumina Ceramics

2011 ◽  
Vol 492 ◽  
pp. 333-336
Author(s):  
Kai Li ◽  
Lu Cun Guo
Keyword(s):  
Flexural Strength ◽  
Thermal Shock ◽  
Temperature Difference ◽  
Thermal Shock Resistance ◽  
Alumina Ceramics ◽  
Sharp Drop ◽  
Quenching Temperature ◽  
Before And After ◽  
Shock Resistance ◽  
Thermal Shock Behavior

The thermal shock behavior of alumina ceramics tested by two different approaches, water and air quenching, using an automatic experimental set was investigated. The changes of the flexural strength before and after the thermal shock was measured and used as an indicator of thermal shock resistance. The study reveals that air quenching test has limited impact on the changes of flexural strength, whereas the water quenching yields considerable decreases of the strength. The alumina ceramics was quenched in water at various temperature differences for five cycles. It is shown that the retained strength of the quenched specimens decreases abruptly at the temperature difference of 300°C, which indicates a great severity of thermal shock in this point. The thermal shock behavior of the specimens is evaluated by quenching in water as three different temperature differences, ΔT, setting at 300°C, 600°C and 800°C, respectively. The results show, for three different ΔT quenches, the strength reductions caused by the quenching exhibit similar trends: After a sharp drop, the residual strength remains almost unchanged at a certain level for each given quenching temperature difference, and the turning points all fall in the very first five to ten thermal cycles range. And the rank of the damage severity of alumina ceramics among the three different temperature differences is: ΔT800°C > ΔT600°C > ΔT300°C

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