Monoclinic barium feldspar ceramic with low thermal expansion coefficient and preparation method

A low thermal expansion coefficient, barium feldspar technology, applied in the field of ceramics, can solve problems such as impure crystal phase, and achieve the effect of less quantity, small pore size and low thermal expansion coefficient

Inactive Publication Date: 2019-11-22
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, the present invention provides a method for preparing monoclinic feldspar ceramics with a low coefficient of thermal expansion. Properties of feldspathic ceramics

Method used

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  • Monoclinic barium feldspar ceramic with low thermal expansion coefficient and preparation method
  • Monoclinic barium feldspar ceramic with low thermal expansion coefficient and preparation method
  • Monoclinic barium feldspar ceramic with low thermal expansion coefficient and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] 1) Provide 48.1wt% of kaolin, 46.9wt% of barium carbonate, and 5wt% of alumina to obtain frit raw materials.

[0057] 2) Add 5% lithium fluoride by weight to the above-mentioned frit raw materials, mix them in a blender, put them into a platinum dry pot, and raise the temperature of the silicon-molybdenum rod lifting electric furnace to 1550 ° C, put the crucible Put it in, keep it warm for 1 hour, and melt it to obtain a uniform and clear barium feldspar glass liquid. Pour the glass liquid into water to quench it, beat the quenched barium feldspar glass into small pieces with a mortar and put it into a polyurethane ball mill jar , with water as the dispersant, zirconia balls as the ball milling medium, the weight ratio of the balls to the material is about 3:1, and ball milled on a fast mill; the ball-milled slurry in the polyurethane ball mill tank is passed through a 60-mesh sieve, and transferred to the enamel iron place in an electric blast drying oven at 120° C., ...

Embodiment 2

[0066] 1) Provide 50.7wt% of kaolin, 44.5wt% of barium carbonate, and 4.8wt% of alumina to obtain frit raw materials.

[0067] 2) Add 10% by weight lithium fluoride to the above-mentioned frit raw materials, mix them in a blender, put them into a platinum dry pot, and raise the temperature of the silicon-molybdenum rod lifting electric furnace to 1500°C, put the crucible Put it in, keep it warm for 1.5h, melt to obtain uniform and clear barium feldspar glass liquid, pour the glass liquid into water and quench it, beat the quenched barium feldspar glass into small pieces with a mortar and put it into a polyurethane ball mill jar In the process, water is used as a dispersant, zirconia balls are used as a ball milling medium, and the weight ratio of balls to materials is about 3:1, and ball milled on a fast mill; the ball-milled slurry in a polyurethane ball mill tank is passed through a 60-mesh sieve, and transferred to the enamel Put it in an iron pan, place it in an electric b...

Embodiment 3

[0076] 1) Provide 30.7wt% of kaolin, 59.5wt% of barium carbonate, and 9.8wt% of alumina to obtain frit raw materials.

[0077] 2) Add 20% by weight lithium fluoride to the above-mentioned frit raw materials, mix them in a blender, put them into a platinum dry pot, and raise the temperature of the silicon-molybdenum rod lifting electric furnace to 1500°C, put the crucible Put it in, keep it warm for 1.5h, melt to obtain uniform and clear barium feldspar glass liquid, pour the glass liquid into water and quench it, beat the quenched barium feldspar glass into small pieces with a mortar and put it into a polyurethane ball mill jar In the process, water is used as a dispersant, zirconia balls are used as a ball milling medium, and the weight ratio of balls to materials is about 3:1, and ball milled on a fast mill; the ball-milled slurry in a polyurethane ball mill tank is passed through a 60-mesh sieve, and transferred to the enamel Put it in an iron pan, place it in an electric b...

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Abstract

The invention discloses monoclinic barium feldspar ceramic with a low thermal expansion coefficient and a preparation method thereof. The preparation method comprises the following steps: step 1, providing 30-60 wt% of kaolin, 30-60 wt% of barium carbonate, 10 wt% or less of aluminum oxide and 10 wt% or less of silicon dioxide according to the mass percentage of the raw materials to obtain a fritraw material; step 2, adding a fluxing agent with a concentration of 20 wt% or less into the frit raw material, carrying out uniform mixing, and carrying out high-temperature melting so as to obtain auniform and clear celsian glass liquid; 3, carrying out quenching and ball milling on the celsian molten glass to obtain a barium feldspar frit; 4, according to the mass percent of the raw materials,providing 60-100 wt% of the celsian frit, kaolin with the weight being 40 wt% or below and silica powder with the weight being 40 wt% or below, and uniformly mixing the components to be uniform to obtain a ceramic blank; and 5, molding the ceramic blank, carrying out crystallization at high temperature, and cooling the product to obtain the monoclinic barium feldspar ceramic with low thermal expansion coefficient. According to the preparation method disclosed by the embodiment of the invention, the prepared ceramic is small in micropore diameter, small in quantity and low in thermal expansion coefficient.

Description

technical field [0001] The invention relates to the technical field of ceramics, in particular to a monoclinic feldspar ceramic with a low thermal expansion coefficient and a preparation method thereof. Background technique [0002] Barium feldspar ceramics are ceramic materials in which barium feldspar is the main crystal phase. The chemical composition of barium feldspar is BaO·Al 2 o 3 2SiO2 2 , is BaO-Al 2 o 3 -SiO 2 The only stable ternary compound in the ternary system. Barium feldspar ceramics have the characteristics of good thermal shock resistance and low dielectric constant. [0003] Barium feldspar mainly has three crystal forms: monoclinic phase, hexagonal phase and orthorhombic phase, but it is generally required that only monoclinic phase barium feldspar exists in barium feldspar ceramics. This is mainly due to the following reasons: 1) monoclinic barium feldspar The thermal expansion coefficients of feldspar and hexagonal barium feldspar are 2.3×10 -...

Claims

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Application Information

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IPC IPC(8): C04B35/195C04B35/622C03C6/06
CPCC03C1/00C04B35/195C04B35/622C04B2235/3418C04B2235/349C04B2235/36C04B2235/6562C04B2235/76C04B2235/9607
Inventor 廖红卫詹文俊李晓麟伍满元
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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