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Process for preparing super-low expansion ceramic material

A technology of ceramic materials and preparation process, which is applied in the field of preparation of ultra-low expansion ceramic materials, can solve problems such as difficult control of the green body, and achieve the effect of eliminating the difficult control of molding

Inactive Publication Date: 2009-09-23
JINGDEZHEN CERAMIC INSTITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, because industrial lithium carbonate is slightly soluble in water and easy to hydrolyze, direct use will make it difficult to control the green body

Method used

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  • Process for preparing super-low expansion ceramic material
  • Process for preparing super-low expansion ceramic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The weight ratio of material A is: 75% of natural spodumene, 20% of industrial lithium carbonate, 1% of zinc oxide, 2% of titanium dioxide, and 2% of magnesium oxide. The frit is pulverized for later use; the weight ratio of material B is: 15% of quartz, 80% of kaolin, and 5% of calcined talc, and these three raw materials are mixed for later use. Then get A material 45% by weight, B material 55% accurate batching, according to material: ball: water=1: 2: 0.8, the residue of slurry crossing 250 mesh sieves is less than 0.1%, slurry dehydration becomes plastic mud material, After shaping, drying, and glazing, it is fired at a firing temperature of 1310°C and kept for 30 minutes. The expansion coefficient of the ceramic product is measured, and its thermal expansion coefficient is a (常温～800℃) is 0.73×10 -6 / ℃, measuring its thermal stability, it can resist rapid cooling and rapid heating 650 ℃ ~ 20 ℃ once without cracking.

Embodiment 2

[0014] The weight ratio of material A is: 75% of natural spodumene, 20% of industrial lithium carbonate, 1% of zinc oxide, 2% of titanium dioxide, and 2% of magnesium oxide. The frit is pulverized for later use; the weight ratio of material B is: 15% of quartz, 80% of kaolin, and 5% of calcined talc, and these three raw materials are mixed for later use. Then get A material 50% by weight, B material 50% accurate batching, according to material: ball: water=1: 2: 0.8, slurry is crossed 250 mesh sieves and remains less than 0.1%, and slurry dehydration becomes plastic mud material, After shaping, drying, and glazing, it is fired at a firing temperature of 1300°C and kept for 30 minutes. The expansion coefficient of the ceramic product is measured, and its thermal expansion coefficient is a (常温～800℃) is 0.66×10 -6 / ℃, measuring its thermal stability, it can resist rapid cooling and rapid heating 650 ℃ ~ 20 ℃ once without cracking.

Embodiment 3

[0016] The weight ratio of material A is: 75% of natural spodumene, 20% of industrial lithium carbonate, 1% of zinc oxide, 2% of titanium dioxide, and 2% of magnesium oxide. The frit is pulverized for later use; the weight ratio of material B is: 15% of quartz, 80% of kaolin, and 5% of calcined talc, and these three materials are mixed for later use. Then get A material 55% by weight, B material 45% accurate batching, according to material: ball: water=1: 2: 0.8, the residue of slurry crossing 250 mesh sieves is less than 0.1%, and slurry dehydration becomes plastic mud material, After shaping, drying, and glazing, it is fired at a firing temperature of 1290°C and kept for 30 minutes. The expansion coefficient of the ceramic product is measured, and its thermal expansion coefficient is a (常温～800℃) 0.60×10 -6 / °C, measuring its thermal stability, it can resist rapid cooling and rapid heating at 650°C to 20°C without cracking once.

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Abstract

The invention provides a process for preparing a super-low expansion ceramic material, which is characterized in that lithium-contained mineral (such as spodumene, eucryptite, and the like), lithium carbonates, zinc oxide, barium carbonate, titanium dioxide, talcum, and the like. are mixed in advance, melted as a glass frit at the temperature of about 1450 DEG C and taken as material A; subsequently, raw materials such as kaolin, quartz, and the like are mixed and taken as material B; the material A, the material B and the calcined spodumene are mixed by a certain proportion; and the steps of ball-milling, forming and baking are carried out to prepare the super-low expansion ceramic material with the thermal expansion coefficient of 0.6-1.0*10[-6] / DEG C (at the normal temperature of about 800 DEG C). The ceramic material can be widely applied to kilns, high-temperature clamps, high-temperature radiation baffles, induction cooker panels, microwave oven liner, household heat-resistance dishware, thermocouple protection tubes, and the like.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials (ceramics), and relates to a preparation process method of ultra-low expansion ceramic materials. Background technique [0002] Low expansion materials have been widely used in ceramics, metallurgy, enamel, special glass, chemical industry, etc., and lithium low expansion ceramics are favored due to their excellent high temperature resistance, thermal shock resistance and high temperature chemical stability. Widely used in ceramic blanks, glazes, kiln furniture, induction heating parts (such as microwave oven gaskets), induction cooker panels, microwave oven linings, household heat-resistant tableware and thermocouple protection tubes, etc. [0003] At present, the preparation process of lithium-based low-expansion ceramic materials mainly uses natural spodumene (Li 2 O·Al 2 o 3 4SiO2 2 ) and other lithium-containing minerals, industrial industrial lithium carbonate (Li 2 CO 3...

Claims

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Application Information

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IPC IPC(8): C04B35/622C04B35/01
Inventor 周健儿包启富黄武清
Owner JINGDEZHEN CERAMIC INSTITUTE
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