Corundum-mullite burn-bearing board having high fineness

A technology of mullite and smoothness, applied in the field of refractory materials, can solve the problems of insufficient surface smoothness of corundum-mullite setter plate, achieve strong cohesion, meet the needs of smoothness, and improve the effect of yield

Inactive Publication Date: 2011-08-31
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of insufficient surface finish of the existing common corundum-mullite setter plate, and to provide a corundum-mullite setter plate with high smoothness

Method used

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Comparison scheme
Effect test

Embodiment 1

[0019] The invention provides a corundum-mullite setter plate with high smoothness, which comprises a corundum-mullite substrate and a coating on the corundum-mullite substrate.

[0020] Production of corundum-mullite substrate: fully knead the corundum-mullite raw material and binder, trap the material, press molding, drying, and firing to obtain a corundum-mullite with a size of 200mm×200mm×10mm solid substrate with an alumina content of 85%. Apply the slurry on the surface of the obtained corundum-mullite substrate to form a surface coating, and scrape it flat with a scraper; put the coated corundum-mullite setter into an oven and dry at 110°C. The slurry is made by adding alumina micropowder into silica sol and fully stirring. Wherein the mass ratio of alumina fine powder to silica sol is 2:1. The purity of the alumina micropowder is ≥99%, and the particle size is 3-5 microns.

Embodiment 2

[0022] Production of corundum-mullite substrate: Fully knead the corundum-mullite raw material and binder, trap the material, press, dry, burn, and cut and grind it into a corundum-mullite with a size of 150mm×150mm×4mm Lithium substrate with an alumina content of 74%. Heat the corundum-mullite substrate soaked in water at 110° C. for 40 minutes in an oven. Apply the slurry on the surface of the obtained corundum-mullite substrate to form a surface coating, and scrape it flat with a scraper; put the coated corundum-mullite setter into an oven and dry at 110°C. The slurry is made by adding alumina micropowder into silica sol and fully stirring. Wherein the mass ratio of alumina fine powder to silica sol is 1:1. The purity of alumina micropowder is ≥99%, and the particle size is 1-3 microns.

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Abstract

The invention relates to the refractory material field and especially relates to a corundum-mullite burn-bearing board having high fineness. The corundum-mullite burn-bearing board having high fineness comprises a corundum-mullite substrate and a coating thereon. The coating is coated with a prepared slurry which is prepared from 0.5 to 2.6 parts of aluminium oxide micro-powder and 1 part of silica sol. Purity of the aluminium oxide micro-powder is more than 99% and granularity is less than 5 micrometers. The corundum-mullite substrate contains 70 to 90% of aluminum oxide. The corundum-mullite burn-bearing board of the invention can meet the fineness demand of burn-bearing products, enable reduction of friction resistance with the burn-bearing products and enable an increase of yield of the finished burn-bearing products. The coating is strongly bonded with the substrate without second calcining and the coating and the substrate can not be separated for long-time using under a high temperature.

Description

technical field [0001] The invention relates to the field of refractory materials, in particular to a corundum-mullite setter plate with high smoothness. Background technique [0002] Corundum-mullite setter plates are widely used in high-temperature industries at 1300°C-1500°C due to their excellent mechanical properties and thermal shock properties, and are often used as carriers for firing electronic products or magnetic materials. The size is mostly between 100mm-500mm, the thickness is between 3mm-20mm, and most of them are formed by semi-dry pressing. As for the thinner setter plate, because it is difficult to form by semi-dry pressing, it is usually obtained by cutting and grinding the thicker setter plate. In the actual use process, some fired products such as electronic films have high requirements on the flatness and smoothness of the setter surface due to their excessive firing shrinkage, so as to reduce the gap between the product and the setter during the firin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/10C04B35/185
Inventor 代刚斌裴春秋
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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