Preparation method of compound refractory kiln furniture

A kind of kiln furniture and refractory technology, which is applied in the field of preparation of composite refractory kiln furniture for firing electronic ceramics. It can solve the problems of difficult spreading of zirconia spacer sand or zirconia spacer powder, high cost of raw materials, poor uniformity of zirconia coating, etc. problems, to avoid delamination and peeling and peeling, to solve the poor uniformity of the coating, and to reduce the production cost

Active Publication Date: 2011-01-05
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the process of use, it is found that there are certain defects in the use of the above three zirconia refractory materials. Method (1): The pure zirconia kiln furniture has problems such as heavy weight, large heat storage, high raw material cost, and difficult sintering; method (2): There are problems such as poor uniformity of the zirconia coating and poor bonding between the coating and the main body of the kiln furniture. During use, the zirconia coating is easy to powder, layered, peeled and peeled off, which in turn causes partial damage to the electronic ceramic products. Pollution; method (3): Zirconia isolation sand or zirconia isolation powder is not easy to spread evenly, and the use process is prone to dislocation and movement due to the sintering problem of isolation sand and isolation powder itself, resulting in sintering deformation of electronic ceramic products, and zirconia isolation Sand or zirconia spacer powder is easily polluted after repeated use, which will affect the quality and performance of electronic ceramic products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Choose corundum-mullite kiln furniture as the main body, and follow the steps in turn:

[0030] (1) Put the main body of fired corundum-mullite kiln furniture into an oxalic acid solution and soak for 1 hour after grinding to make the surface have certain adsorption activity, and dry it for later use;

[0031] (2) To prepare a uniform and stable zirconia slurry, the method is: first mix the fused zirconia micropowder with a particle size of <3 μm and the aqueous solution at a mass ratio of 1:0.5, and then add the fused zirconia micropowder and the aqueous solution respectively 1.5% polyacrylamide dispersant (externally added) and 0.3% CMC anti-sedimentation agent (externally added) by total weight, and adjust the pH value of the melt to 9 with ammonia water; then, continue stirring until the slurry is uniform and stable;

[0032] (3) Negative pressure impregnation of kiln furniture: Put the pretreated kiln furniture body into the container, use vacuum equipment to draw ...

Embodiment 2

[0036] Choose mullite-cordierite kiln furniture as the main body, and follow the steps below:

[0037] (1) Put the main body of fired mullite-cordierite kiln furniture into an oxalic acid solution for 1 hour after grinding, so that the surface has certain adsorption activity, and dry it for later use;

[0038] (2) To prepare stabilized zirconia slurry, the method is: first mix the fused zirconia micropowder with a particle size of <3 μm and the aqueous solution at a mass ratio of 1:0.3, and then add 1% of the total weight of the fused zirconia micropowder and the aqueous solution respectively. % polyethylene glycol dispersant (external addition) and 0.5% CMC anti-sedimentation agent (external addition), and adjust the pH value of the melt to 10 with ammonia water; then, continue stirring until the slurry is uniform and stable;

[0039] (3) Negative pressure impregnation of kiln furniture: Put the pretreated kiln furniture body into the container, use vacuum equipment to draw a...

Embodiment 3

[0043] Choose corundum-cordierite kiln furniture as the main body, and follow the steps below:

[0044](1) Put the main body of fired corundum-cordierite kiln furniture into a citric acid solution and soak it for 2 hours after being polished to make the surface have certain adsorption activity, and dry it for later use;

[0045] (2) To prepare stabilized zirconia slurry, the method is: firstly blend the fused zirconia micropowder with a particle size of <3 μm and the aqueous solution at a mass ratio of 1:0.25, and then add 0.5 % of polyacrylamine dispersant (external addition) and 0.5% CMC anti-sedimentation agent (external addition), and adjust the pH value of the melt to 10 with ammonia water; then, continue stirring until the slurry is uniform and stable;

[0046] (3) Negative pressure impregnation of kiln furniture: Put the pretreated kiln furniture body into the container, use vacuum equipment to draw a vacuum, keep the pressure in the container at about -0.1MPa, and wait...

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PUM

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Abstract

The invention discloses a preparation method of compound refractory kiln furniture. In the preparation method, firstly, a kiln furniture main body is selected; surface pretreatment is carried out on the surface of the kiln furniture main body to cause the surface to have certain adsorption activity; a negative-pressure dipping method is adopted to evenly adsorb stable zirconia slurry prepared in advance to the surface of the kiln furniture main body and fill into the air holes or microcracks of the kiln furniture main body; and the obtained product is dried and sintered at high temperature to obtain the compound refractory kiln furniture of the invention. The compound kiln produced by the invention has the advantages of low cost, even coating, good integrity, small possibility of deforming, low volatility and the like. The manufacturing method is also scientific and reasonable, is easy to popularize and apply, etc.

Description

technical field [0001] The invention belongs to the technical field of refractory material preparation, and in particular relates to a method for preparing composite refractory kiln furniture for firing electronic ceramics. Background technique [0002] During the firing process of electronic ceramics, in order to obtain a good appearance of the product, prevent sintering deformation, and avoid adverse reactions between electronic ceramics and kiln furniture used during high-temperature sintering, high temperature resistance, low volatility, and Zirconia refractories with strong inertness, the use methods of zirconia refractories usually include the following: (1) making pure zirconia kiln furniture as a whole; (2) using corundum-mullite, mullite-cordierite , corundum-cordierite, etc. as the main body of kiln furniture, and then spray or smear zirconia coating on its surface; (3) use corundum, corundum-mullite, corundum-cordierite, etc. Zirconium isolation sand or zirconia ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/85C04B35/66
Inventor 谭清华吴爱军张涛胡飘王晗尹洪基吕世坪
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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