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Zirconia refractory product with composite structure

A technology of refractory products and composite structures, applied in the field of refractory materials, can solve problems such as corrosion, increased thermal conductivity, surface cracks of zirconia products, etc., and achieve the effects of increased service life, moderate thermal conductivity, and low input costs

Active Publication Date: 2016-02-24
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the increase of alumina content in zirconia, the temperature point at which the two form a solid solution to form a liquid phase decreases, and the microstructure of zirconia refractory products intruded into alumina is destroyed. The macroscopic manifestations are cracks, erosion, Thermal shock fracture, and the thermal conductivity increases, the insulation effect decreases

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Prepare metal aluminum powder, polyvinyl alcohol aqueous solution (5wt% concentration), ammonium polyacrylate, carboxymethyl cellulose and water in proportions of 86.0wt%, 0.8wt%, 0.1wt%, 0.1wt% and 13.0wt%. , using a high-speed mixer to mix for 30 minutes to prepare a uniformly mixed metal aluminum powder slurry; clean the surface of the fired zirconia product and dry it at 120°C for 3 hours; put the uniformly mixed metal aluminum powder slurry into a spray gun tank Inside, use compressed air to evenly spray the metal aluminum powder slurry in the spray gun tank to the inner surface of the treated zirconia product and the side connected to the inner surface; dry the sprayed zirconia refractory product at 60 ° C for 3 hours, 110 Dry at ℃ for 6 hours, and then conduct heat treatment under a nitrogen protective atmosphere. During the treatment, the metal aluminum powder reacts with nitrogen to form an aluminum nitride layer. The maximum treatment temperature is 1800 ℃, and...

Embodiment 2

[0035] Prepare metal aluminum powder, polyvinyl alcohol aqueous solution (5wt% concentration) and water in proportions of 83.0wt%, 0.8wt%, and 16.2wt%, and mix them with a high-speed mixer for 30 minutes to prepare a uniformly mixed metal aluminum powder slurry ; Clean the surface of the fired zirconia refractory products, and dry them at 120°C for 3 hours; put the uniformly mixed metal aluminum powder slurry into the spray gun tank, and use compressed air to evenly mix the metal aluminum powder slurry in the spray gun tank Spray on the inner surface of the treated zirconia product and the side connected to the inner surface; dry the sprayed zirconia refractory product at 60°C for 3 hours, dry at 110°C for 6 hours, and then conduct heat treatment under a nitrogen protective atmosphere. In the process, the metal aluminum powder reacts with nitrogen to produce an aluminum nitride layer. The maximum treatment temperature is 1800°C, and a zirconia refractory product with an aluminu...

Embodiment 3

[0037] Prepare metal aluminum powder, resin, ammonium polyacrylate, carboxymethyl cellulose and absolute ethanol in proportions of 86.0wt%, 0.8wt%, 0.10wt%, 0.1wt% and 13.0wt%, and mix them with a high-speed mixer for 30 minutes , to prepare a homogeneously mixed metal aluminum powder slurry; clean the surface of the fired zirconia product, and dry it at 120°C for 3 hours; put the evenly mixed metal aluminum powder slurry into a spray gun tank, and use compressed air to The metal aluminum powder slurry in the spray gun tank is evenly sprayed onto the inner surface of the treated zirconia refractory product and the side connected to the inner surface; the sprayed zirconia refractory product is dried at 60°C for 3 hours and at 110°C for 6 hours , and then conduct heat treatment under a nitrogen protective atmosphere. During the treatment process, the metal aluminum powder reacts with nitrogen to form an aluminum nitride layer. The maximum treatment temperature is 2200 ° C, and a ...

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Abstract

The invention belongs to the field of refractory materials, and provides a zirconium oxide refractory product with a composite structure. As the furnace lining material of a sapphire crystal growing furnace, the zirconium oxide refractory product with the composite structure comprises zirconium oxide particles, zirconium oxide fine powder and zirconium oxide micro powder. When in use, the zirconium oxide refractory product has temperature gradient, one surface, close to the center of a furnace body, of the product has high temperature, thus being taken as a hot surface; one surface, far away from the center of the furnace body of the product has low temperature, thus being taken as a cold surface; the skin layer of the hot surface of the zirconium oxide refractory product is in the composite structure comprising an aluminum nitride layer and the matrix of the zirconium oxide refractory product. Aluminum oxide steam is prevented from permeating into the zirconium oxide refractory product, so that the service life of the zirconium oxide refractory product in the sapphire crystal growing furnace is prolonged.

Description

technical field [0001] The invention belongs to the field of refractory materials, and mainly relates to a zirconia refractory product with a composite structure. Background technique [0002] Zirconia is an important refractory raw material with a melting point as high as 2715°C and excellent physical and chemical properties. In order to improve the performance of many refractories, a certain amount of zirconia is added, such as fused AZS bricks, Al 2 o 3 -ZrO 2 -C brick, Cr 2 o 3 -Al 2 o 3 -ZrO 2 bricks etc. [0003] High-purity zirconia refractory products usually refer to refractory products with a zirconia (including stabilizer) content of more than 98%. It uses zirconia particles or zirconia hollow spheres, zirconia fine powder, stabilizers, binders, etc. as raw materials. The refractory products of the desired shape are prepared by casting, pouring, machine pressing, isostatic pressing, ramming and other molding methods. Compared with zirconium-containing re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/87
Inventor 耿可明胡飘石鹏坤李宗泰谭清华孙红刚闫双志冯志源
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES