Effect of molar ratios of MgO/Al2O3 on the sintering behavior and thermal shock resistance of MgOAl2O3SiO2 composite ceramics

The physical and mechanical properties of nanometer ZrO2-ZrO2fiber composite ceramics were studied by introduction of ZrO2fiber. ZrO2composite ceramics at different sintering temperature was investigated by porosity and water absorption measurements, flexual strength and thermal shock resistance analysis. Results showed that ZrO2composite ceramics containing 15 wt% ZrO2fiber with sintering temperature of 1650°C exhibited good mechanical properties and thermal shock resistance. The porosity and the water absorption were 8.84% and 1.62%, respectively. The flexual strength was 975 MPa and the thermal shock times reached 31 times. Scanning electron microscope (SEM) was used to analyze the microstructure of ZrO2composite ceramics.

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

Materials Science Forum ◽

10.4028/www.scientific.net/msf.922.62 ◽

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.

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Effect of M-ZrO2 on Sintering Behavior and Thermal Shock Resistance of Dense Cr2O3 Material

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.199-200.1928 ◽

2011 ◽

Vol 199-200 ◽

pp. 1928-1931 ◽

Cited By ~ 2

Author(s):

Hong Ji Yin ◽

Tao Zhang ◽

Ai Jun Wu ◽

Jin Xiang Wang

Keyword(s):

Polyvinyl Alcohol ◽

Oxygen Partial Pressure ◽

Thermal Shock ◽

Thermal Shock Resistance ◽

Room Temperature ◽

Cold Isostatic Pressing ◽

Sintering Behavior ◽

Quenching Effect ◽

Material Sample ◽

Shock Resistance

The samples were prepared using Cr2O3 micropowder, TiO2 micropowder and m-ZrO2 micropowder as main starting material, polyvinyl alcohol as binder, by a series of processes such as pulping, spraying granulation, machine moulding and cold isostatic pressing, and sintering at 1 500°С for 3 h in nitrogen protected atmosphere furnace (oxygen partial pressure was 10 Pa). Then thermal shock resistance of the samples was tested by wind quenching. Effect of m-ZrO2 (2%-5% in mass) on sintering behavior and thermal shock resistance of Cr2O3 material was investigated. The results show that m-ZrO2 can accelerate the sintering of Cr2O3 material, but excess 2 wt% m-ZrO2 doesn’t work; m-ZrO2 can obviously improve thermal shock resistance of Cr2O3 material, sample containing 3 wt% m-ZrO2 has 34 wind quenching cycles from 1 150°С to room temperature, and sample without m-ZrO2 only has 11 cycles.

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Preparation and thermal shock resistance of corundum-mullite composite ceramics from andalusite

Ceramics International ◽

10.1016/j.ceramint.2016.10.116 ◽

2017 ◽

Vol 43 (2) ◽

pp. 1762-1767 ◽

Cited By ~ 24

Author(s):

Xiaohong Xu ◽

Jingwen Li ◽

Jianfeng Wu ◽

Zhaohui Tang ◽

Linlin Chen ◽

...

Keyword(s):

Thermal Shock ◽

Thermal Shock Resistance ◽

Composite Ceramics ◽

Shock Resistance

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Titania Effect on Sintering behavior of Alumina

Baghdad Science Journal ◽

10.21123/bsj.6.4.770-774 ◽

2009 ◽

Vol 6 (4) ◽

pp. 770-774

Author(s):

Baghdad Science Journal

Keyword(s):

Water Absorption ◽

Thermal Shock ◽

Thermal Shock Resistance ◽

Sintering Temperature ◽

Shrinkage Porosity ◽

Sintering Behavior ◽

Pure Alumina ◽

Titania Powder ◽

Laboratory Results ◽

Shock Resistance

The sintering behavior of Alumina was investigated by adding TiO2. The addition of TiO2 lowered the sintering temperature of the Alumina compared with those of pure Alumina. The result suggests that TiO2 acts as an activator for sintering of Alumina. Water absorption, apparent porosity and density were examined for both pure and TiO2 added to Alumina samples. The variations of sintering behavior were discussed in terms of shrinkage, porosity, water absorption and density. Thermal shock resistance was also examined. In term of this work, the way of improving the thermal shock resistance in oxide- based materials by adding reactive Titania powder to the Alumina samples. The laboratory results showed an improvement in thermal shock resistance property of the products which open the horizon of development of the final products.

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