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Ceramic blank, ceramic vessel and preparation method thereof

A technology for ceramic blanks and ceramics, applied in the field of ceramics, can solve the problems of reduced thermal shock resistance of products, zero water absorption of products, narrow sintering temperature range, etc., to reduce costs and thresholds, improve plasticity, and wide sintering temperature range. Effect

Active Publication Date: 2020-09-22
湖南嘉盛电陶新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current high-end ceramic products require a thermal shock resistance temperature greater than 600°C and a thermal expansion coefficient of 1.5×10 -6 / °C or less, but its disadvantage is that the sintering temperature range is narrow, generally within the range of 10-20°C
If the sintering range of the material is too narrow, the water absorption rate of the product will easily drop to zero during the sintering process, resulting in the appearance of a glass phase. Excessive glass phases in the material system will lead to an excessive expansion coefficient of the material and thermal shock resistance of the product performance degradation
Therefore, the sintering range is too narrow, which reduces the qualified rate of product production and increases the production cost and threshold of enterprises. Due to this reason, there are few enterprises in the market that can produce high-end thermal shock resistance ceramics, which cannot meet the needs of the market.

Method used

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Examples

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Comparison scheme
Effect test

preparation example Construction

[0022] A method for preparing a ceramic blank according to an embodiment of the present invention includes the following steps: weighing each raw material according to the above mass percentage and mixing them to obtain a ceramic blank.

[0023] A ceramic vessel according to an embodiment of the present invention, the raw materials for its preparation include the above-mentioned ceramic blank. The preparation method of the ceramic vessel comprises the following steps: weighing the ceramic blank and water according to the mass ratio of 1:1.1-1.3, mixing the ceramic blank with water, grinding, molding and firing to obtain the ceramic vessel.

[0024] In one embodiment, the grinding conditions are as follows: the ceramic blank and water are put into a ball mill and milled for 1 to 3 hours, and then passed through a 200-mesh sieve to remove some particles with larger particle sizes, which is beneficial to improve the performance of the blank.

[0025] In one embodiment, the above ...

Embodiment 1

[0030] The raw materials of each component were weighed according to the following mass percentages: eucryptite 28%, Suzhou soil 23%, Guangxi white mud 5%, black mud 22%, lithium carbonate 11%, quartz 4%, alumina 3%, niobium oxide 2.5% % and zinc oxide 1.5%, the particle size of niobium oxide and zinc oxide is 5μm. Put the raw materials of each component into the ball mill, add water according to the mass ratio of ceramic blank and water 1:1.2, mix and ball mill for 2 hours, pass through a 200-mesh vibrating sieve, and remove iron circularly, and then adjust the specific gravity to 1.45g / cm 3 , After 3 days of staleness, use the mold for grouting. Then go into the kiln to burn ceramic vessels, the sintering temperature is 1280-1330°C, the sintering cycle is 6 hours, and the thermal expansion coefficient is 0.85×10 -6 / °C. After heating the ceramic vessel to 650°C and immersing it in water at 20°C, repeating this three times, the ceramic vessel will not crack.

Embodiment 2

[0032] The raw materials of each component were weighed according to the following mass percentages: eucryptite 30%, Suzhou soil 20%, Guangxi white mud 7%, black mud 25%, lithium carbonate 10%, quartz 2%, alumina 2%, niobium oxide 2.5% % and zinc oxide 1.5%, the particle size of niobium oxide and zinc oxide is 5μm. Put the raw materials of each component into the ball mill, add water according to the mass ratio of ceramic blank and water 1:1.2, mix and ball mill for 2 hours, pass through a 200-mesh vibrating sieve, and remove iron circularly, and then adjust the specific gravity to 1.45g / cm 3 , After 3 days of staleness, use the mold for grouting. Then go into the kiln to sinter ceramic vessels, the sintering temperature is 1260-1310°C, the sintering cycle is 6 hours, and the thermal expansion coefficient is 0.93×10 -6 / °C. After heating the ceramic vessel to 650°C and immersing it in water at 20°C, repeating this three times, the ceramic vessel will not crack.

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Abstract

The invention relates to a ceramic body and a ceramic utensil and a preparation method thereof. The ceramic body is prepared from the following raw materials in percentage by mass: 20%-40% of eucryptite, 10%-30% of Suzhou clay, 5%-15% of Guangxi white clay, 10%-25% of black clay, 5%-20% of lithium carbonate, 2%-8% of quartz, 2%-8% of aluminium oxide, 1%-8% of niobium oxide and 1-8% of zinc oxide.According to the ceramic body, the eucryptite is used as a matrix, the Suzhou clay, the Guangxi white clay and the black clay with a certain ratio are added to make a material easier to form in a production process, meanwhile, the quartz and the aluminium oxide with a certain ratio are added to adjust a ratio between silicon to aluminium, certain amounts of the niobium oxide and the zinc oxide areintroduced to conduct doping on lithium and aluminium sites, and are in cooperation with the other components to make a solid solution formed, and a crystal structure of the material is stabilized better, so that a thermal-expansion coefficient of the material is reduced, the sintering temperature range is expanded, according to the prepared ceramic utensil, thermal shock resistance temperature is higher than 600 DEG C, and a thermal-expansion coefficient is lower than 1.5*10<-6> / DEG C.

Description

technical field [0001] The invention relates to the technical field of ceramics, in particular to a ceramic blank, a ceramic vessel and a preparation method thereof. Background technique [0002] With the continuous improvement of people's living standards, the demand for high-performance ceramics in the market is also increasing. The thermal shock resistance temperature of ordinary ceramic products is below 450°C, and the thermal expansion coefficient is required to be 2.5×10 -6 / °C or so. However, the current high-end ceramic products require a thermal shock resistance temperature greater than 600°C and a thermal expansion coefficient of 1.5×10 -6 / °C or less, but its disadvantage is that the sintering temperature range is narrow, generally within the range of 10-20°C. If the sintering range of the material is too narrow, the water absorption rate of the product will easily drop to zero during the sintering process, resulting in the appearance of a glass phase. Excessiv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B33/13C04B33/24
CPCC04B33/13C04B33/24C04B2235/3203C04B2235/3217C04B2235/3251C04B2235/3284C04B2235/3418C04B2235/3472C04B2235/5436C04B2235/602C04B2235/6022C04B2235/656C04B2235/6567C04B2235/9607
Inventor 资利云李绍江施小罗
Owner 湖南嘉盛电陶新材料股份有限公司