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Yttrium-aluminum-garnet-containing spinel refractory raw material and preparation method thereof

A technology of yttrium aluminum garnet and refractory raw materials, applied in the field of spinel refractory raw materials and its preparation, can solve the problem of low softening temperature under load and high temperature strength, poor corrosion resistance and thermal shock stability, and limit the application of spinel materials, etc. problems, achieve low apparent porosity, promote sintering densification, excellent thermal shock stability and high temperature mechanical properties

Inactive Publication Date: 2013-11-20
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the application of spinel materials in high-temperature industrial fields such as metallurgy, building materials, electromechanical, and chemical industries is greatly limited.
[0004] Therefore, there are some deficiencies in the preparation methods of spinel materials, such as low refractoriness, poor erosion resistance and thermal shock stability, low load softening temperature and high temperature strength
Unable to meet the requirements of key refractory products in the high temperature industrial field

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A spinel refractory raw material containing yttrium aluminum garnet and a preparation method thereof. First use 35~45wt% magnesia powder, 28~38wt% alumina powder, 25~30wt% spinel powder and 0.5~2wt% dry mix as raw materials, plus 3~5wt% of the raw materials combined agent, stirred evenly, and machine-pressed; then dried the formed body at 110°C for 12-24 hours, and then fired at 1550-1650°C for 5-8 hours to obtain yttrium-containing aluminum garnet Spinel refractory raw material.

[0030] The preparation method of the dry mixture is as follows: firstly, 20-30wt% aluminum metal powder, 30-35wt% aluminum nitride powder and 40-50wt% yttrium-containing compound are used as raw materials, put into a ball mill and dry-mixed evenly, Get a dry mix.

[0031] In this embodiment: the binding agent is polylactic acid; the yttrium-containing compound is yttrium sulfate octahydrate.

[0032] The spinel refractory raw material containing yttrium aluminum garnet prepared in this emb...

Embodiment 2

[0034] A spinel refractory raw material containing yttrium aluminum garnet and a preparation method thereof. First use 50~60wt% magnesia powder, 15~25wt% alumina powder, 20~25wt% spinel powder and 1~4wt% dry mix as raw materials, plus a combination of 5~7wt% of the raw materials agent, stirred evenly, and machine-pressed; then dried the formed green body at 110°C for 24-36 hours, and then fired at 1450-1550°C for 2-4 hours to obtain yttrium-containing aluminum garnet Spinel refractory raw material.

[0035] The preparation method of the dry blend is as follows: 30-40wt% aluminum metal powder, 25-30wt% aluminum nitride powder and 30-40wt% yttrium-containing compound are used as raw materials, put into a ball mill and dry-mixed evenly, Get a dry mix.

[0036] The binding agent described in this embodiment is urethane acrylate; the yttrium-containing compound is yttrium fluoride.

[0037] The spinel refractory raw material containing yttrium aluminum garnet prepared in this ex...

Embodiment 3

[0039] A spinel refractory raw material containing yttrium aluminum garnet and a preparation method thereof. First use 45~55wt% magnesia powder, 20~30wt% alumina powder, 20~25wt% spinel powder and 4~7wt% dry mix as raw materials, plus 3~5wt% of the raw materials combined agent, stirred evenly, and machine-pressed; then dried the formed body at 110°C for 12-24 hours, and then fired at 1500-1600°C for 4-6 hours to obtain yttrium-aluminum garnet Spinel refractory raw material.

[0040] The preparation method of the dry blend is as follows: firstly, 20-30wt% of metal aluminum powder, 35-40wt% of aluminum nitride powder and 35-45wt% of yttrium-containing compound are used as raw materials, and put into a ball mill and dry-mixed evenly, Get a dry mix.

[0041] The binding agent described in this embodiment is urethane acrylate; the yttrium-containing compound is yttrium nitrate hexahydrate.

[0042] The spinel refractory raw material containing yttrium aluminum garnet prepared in...

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Abstract

The invention relates to a yttrium-aluminum-garnet-containing spinel refractory raw material and a preparation method thereof. The technical scheme is as follows: the preparation method comprises the following steps: uniformly mixing a raw material composed of 35-60 wt% of magnesite powder, 15-40 wt% of aluminum oxide powder, 20-30 wt% of spinel powder and 0.5-7 wt% of dry mixture with binder accounting for 3-7 wt% of the raw material, and molding by machining; drying the molded blank at 110 DEG C for 12-36 hours, and firing at 1450-1650 DEG C for 2-8 hours to obtain the yttrium-aluminum-garnet-containing spinel refractory raw material. The yttrium-aluminum-garnet-containing spinel refractory raw material has higher volume density and lower apparent porosity; and the refractory material prepared from the yttrium-aluminum-garnet-containing spinel refractory raw material can have excellent thermal shock stability and high-temperature mechanical properties, and especially have more obvious effect when being used as a high-efficiency spinel refractory material.

Description

technical field [0001] The invention belongs to the technical field of spinel refractory raw materials. Specifically relates to a spinel refractory raw material containing yttrium aluminum garnet and a preparation method thereof. Background technique [0002] Magnesium-aluminum spinel is widely used in the refractory industry because of its high melting point, high hardness, excellent thermal shock resistance and slag erosion resistance. Especially in recent years, it has been recognized that Cr 6+ Due to the hazards of chemical compounds, spinel refractories are used in cement rotary kilns, glass kilns and refining equipment to replace chromium-containing materials. However, spinel-based refractory materials have low high-temperature strength and poor erosion resistance (such as resistance to metallurgical slag and cement clinker erosion), which greatly limits their application in the above-mentioned industrial fields. [0003] In the prior art, by adding SiO 2 , Fe 2 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/44C04B35/443C04B35/622
Inventor 王周福王晓玲马静刘浩王玺堂
Owner WUHAN UNIV OF SCI & TECH
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