Improving the thermal-shock resistance of high-alumina ceramics

1979 ◽  
Vol 36 (9) ◽  
pp. 518-520
Author(s):  
L. P. Ivanova ◽  
N. N. Savanina ◽  
Yu. I. Kelin ◽  
A. P. Malygina
Keyword(s):  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
High Alumina ◽  
Alumina Ceramics ◽  
Shock Resistance

Influence of Zircon Addition on Thermal Shock Resistance of ZTA for Plasma Reactors

2007 ◽  
Vol 544-545 ◽  
pp. 379-382
Author(s):  
Kyung Hun Jang ◽  
Bum Rae Cho
Keyword(s):  
Thermal Expansion ◽  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Sintering Temperature ◽  
Plasma Reactors ◽  
Alumina Ceramics ◽  
Low Thermal Expansion ◽  
Resultant Data ◽  
Shock Resistance ◽  
Zirconia Toughened Alumina

The effect of CaO, MgO and SiO2 as a flux on the sinterability of zirconia toughened alumina(ZTA) used for plasma reactors was investigated and the effect of zircon addition on thermal shock resistance of ZTA with 15wt.% of ZrO2 was also investigated. The resultant data revealed that ZTA shows the best sinterability at the composition of 2wt.% of CaO, 4wt.% of MgO and 2wt.% of SiO2 and at the sintering temperature of 1350°C. Thermal shock resistance of ZTA containing zircon was improved significantly. It is shown that ZTA containing 10wt.% of zircon shows better thermal shock resistance than others. This fact can be explained due to the low thermal expansion coefficient of zircon. It was concluded that zircon is an effective material to improve thermal shock resistance of alumina ceramics.

Thermal Shock Resistance Behavior of Alumina Ceramics Incorporated with Boron Nitride Nanotubes

2011 ◽  
Vol 94 (8) ◽  
pp. 2304-2307 ◽  
Author(s):  
Wei-Li Wang ◽  
Jian-Qiang Bi ◽  
Kang-Ning Sun ◽  
Ming Du ◽  
Na-Na Long ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Boron Nitride Nanotubes ◽  
Alumina Ceramics ◽  
Shock Resistance

Effect of MgO/CuO on the Microstructure and Thermal Properties of Cordierite–Alumina Ceramics

2012 ◽  
Vol 509 ◽  
pp. 240-244
Author(s):  
Li Ying Tang ◽  
Xi Cheng ◽  
Ping Lu ◽  
Fang Yue
Keyword(s):  
Thermal Conductivity ◽  
Bulk Density ◽  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Raw Materials ◽  
Laser Flash ◽  
Alumina Powder ◽  
Alumina Ceramics ◽  
Conductivity Increase ◽  
Shock Resistance

Abstract: Cordierite–alumina ceramics were prepared with the raw materials of cordierite and α-alumina powder, and TiO2，CuO and MgO were added as composite additives. The effect of MgO/ CuO ratios on the microstructure, thermal conductivity and thermal shock resistance of cordierite–alumina ceramics were researched by X-ray diffraction, scanning electron microscopy and laser flash analyzer; the bulk density and the porosity of cordierite – alumina ceramics were measured. The results show that with increasing of MgO/CuO ratios, the bulk density and thermal conductivity increase firstly and then decrease, and have a minimum with 0.4wt% MgO and 0.667 MgO/CuO; and the porosity of ceramics decreases firstly and then increases and has a maximum with 0.4wt% MgO and 0.667 MgO/CuO;There are little changes in the size of the grain of the ceramics, and a small amount of magnesium aluminate spinel precipitate; the thermal shock resistance performance of the ceramics is developed with the increasing of MgO/CuO ratios.

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.

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

A high-alumina ceramic possessing high thermal shock resistance

Refractories ◽  
1987 ◽  
Vol 28 (5-6) ◽  
pp. 238-241
Author(s):  
M. V. Glazacheva ◽  
E. Ya. Medvedovskii ◽  
F. Ya. Kharitonov ◽  
A. M. Cherepanov
Keyword(s):  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Alumina Ceramic ◽  
High Alumina ◽  
Shock Resistance ◽  
High Thermal Shock Resistance

Study on Thermal Shock Resistance of Alumina Composite Ceramics by Indention Quenching Method

2015 ◽  
Vol 655 ◽  
pp. 92-96
Author(s):  
Fen Ling Qian ◽  
Zhi Yong He ◽  
Zhi Peng Xie ◽  
Xiao Bo Wang ◽  
Qi Fu Zhang
Keyword(s):  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Covalent Bond ◽  
Alumina Ceramics ◽  
Composite Ceramics ◽  
Mullite Fiber ◽  
Alumina Composite ◽  
Shock Resistance ◽  
Quenching Method ◽  
Industry Area

Alumina ceramics are the most widely used structural ceramics, especially in aviation, spaceflight and war industry area. However, alumina is of covalent bond, with low fracture toughness and poor thermal shock resistance, which baffle the application of the alumina ceramics in engineering. In this paper, mullite fiber was used to improve its toughness and thermal shock resistance. Alumina-mullite composite ceramics were prepared by hot press sintering. The effect of mullite fiber on thermal shock resistance of ceramics was investigated through indention quenching method. Meanwhile, the mechanism of its reinforcing and toughening and the relationship between mechanical properties and addition of mullite fiber were also discussed.

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