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Microporous MgAlON composite corindon material preparation method

A composite corundum and microporous technology is applied in the field of refractory materials, which can solve the problems of expensive raw material AlN, difficult to store, and high sintering temperature of the material, and achieve the effects of reducing the preparation cost, prolonging the service life and improving the performance of the material.

Inactive Publication Date: 2006-12-20
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The raw material AlN used in this method is expensive, easy to hydrate and difficult to store, and the firing temperature of the material is relatively high

Method used

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  • Microporous MgAlON composite corindon material preparation method
  • Microporous MgAlON composite corindon material preparation method
  • Microporous MgAlON composite corindon material preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1, adopt electric fused white corundum (Al 2 o 3 98wt%) granular mixture (3-1mm 45wt%, 1-0.074mm 15wt%) as aggregate, using activated alumina powder 26wt% (particle size2 o 3 99wt%), metal aluminum powder 10wt%, the compound of chemically pure MgO 4wt% is made substrate; After various raw materials are weighed in proportion, earlier powder and granule are mixed in mixer respectively 5 minutes to evenly; Add the binding agent-sulfite pulp waste liquid (d=1.18g / cm3) of above-mentioned raw material amount 3wt% in the granular material 3 ) mix for 5 minutes until uniform, then add the pre-mixed powder, mix in the mixer for 10 minutes until uniform to make mud; put the mud into a press and mold it under 100MPa pressure to form 25×25×125mm Green body; After the green body is dried for 4 hours, put it into a nitrogen atmosphere furnace and burn it under the condition of 1500℃×1h; after the heat preservation is completed, the nitrogen gas flow can only be stopped...

Embodiment 2

[0015] Embodiment 2, adopt electric fused white corundum (Al 2 o 3 98wt%) granular mixture (3-1mm 45wt%, 1-0.074mm 15wt%) as aggregate, using activated alumina powder 29wt% (particle size2 o 3 99wt%), metal aluminum powder 6wt%, the compound of chemically pure MgO 5wt% is made substrate; After various raw materials are weighed in proportion, first powder and granulate are mixed in mixer respectively 5 minutes to evenly; Add the binding agent-sulfite pulp waste liquid (d=1.18g / cm3) of above-mentioned raw material amount 3wt% in the granular material 3 ) mix for 5 minutes until uniform, then add the pre-mixed powder, mix in the mixer for 10 minutes until uniform to make mud; put the mud into a press and mold it under 100MPa pressure to form 25×25×125mm Green body; After drying the green body for 4 hours, put it into a nitrogen atmosphere furnace and burn it under the condition of 1200°C×1h; after the heat preservation is completed, the nitrogen flow can only be stopped when ...

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Abstract

A preparing method of micro porous MgAlON composite alumina material belongs to the area of fire resistive material technology. The invention with the aggregate being multi-granular alumina and the base material being the mixture of active aluminum oxide powder, aluminum powder or alumina silica or aluminum-magnesium alloy powder containing the same quantity of aluminum, magnesium oxide powder or magnesite powder or magnesium aluminate spinel containing the same quantity of magnesium oxide produces the micro porous MgAlON composite alumina material by thermite azotizing reaction. The combination reaction of MgAlON is completed at he same time of sintering, that simplifies the preparing process of micro porous MgAlON composite alumina material; the micro porous MgAlON composite alumina material produced from the process with the fine crystal particle in base material and most of the diameters of gas pore being less than 1-2 mum can improve the strength of materials, stability of heat shock and slag resistance, and extend the use life. The invention can save the production cost largely, improve the ability of the material, favor the use in the industry of metallurgy, organic chemical industry, ceramics and aerospace technology, and etc.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to an aggregate made of multi-stage corundum particle mixture, activated alumina powder, metal aluminum powder and magnesium oxide powder as a matrix material, which is sintered by nitriding reaction A preparation method for preparing a microporous MgAlON composite corundum material. Background technique [0002] MgAlON is a silicon-free, carbon-free high-melting point compound obtained by stabilizing AlON with MgO. As a new ceramic material, it has received extensive attention in recent years. Because MgAlON has excellent chemical and mechanical properties, it can be used in the field of refractory materials to prepare MgAlON composite advanced refractory materials, improve high-temperature mechanical properties, thermal shock stability, slag resistance, and liquid steel erosion resistance of refractory materials. The pollution caused by the use of materia...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/622
Inventor 杨道媛胡金明关绍康
Owner ZHENGZHOU UNIV
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