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Composite magnesia alumina spinel/Sialon ceramic material and its prepn process

A technology of magnesia-alumina spinel and composite ceramics, which is applied in the field of magnesia-alumina spinel/Sialon composite ceramic materials and its preparation, can solve the problems of incomplete utilization of aluminum ash components, large waste, and high aluminum ash content, and achieve durable Improvement of compressive strength and thermal shock resistance, reduction of environmental pollution, effects of extensive social and economic value

Inactive Publication Date: 2007-11-07
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these technologies currently have limitations: one is that Al in aluminum ash is required 2 o 3 The content is high; the second is that the utilization of aluminum ash components is not complete, and the waste is large

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] A magnesia-aluminum spinel / Sialon composite ceramic material and a preparation method thereof, comprising 25-30wt% of aluminum ash, 0.1-5wt% of light-burned magnesia, 1-6wt% of fused magnesia, 0.1-9wt% sintered magnesia, 30-40wt% bauxite clinker fine powder, 20-30wt% elemental silicon fine powder, 0.1-5wt% metal aluminum fine powder, 0.1-10wt% silicon micropowder, 5-15wt% The quartz powder and 5-15wt% quartz glass powder are mixed and shaped after stirring. The formed green body is first heated to 1000-1100°C in an atmosphere furnace under a nitrogen atmosphere, kept for 2-2.5 hours, and then heated for 2 Heat up to 1300-1350°C at a heating rate of ~3°C / min, hold for 3-4 hours, then heat up to 1360-1500°C at a heating rate of 2-3°C / min, hold for 5-6 hours, and finally under the protection of nitrogen Cool naturally to room temperature.

[0012] The chemical composition of aluminum ash is: Al 2 o 3 24.62%, Al 29.6%, MgO 10.7%, SiO 2 10.5%, Na 2 O is 3.7%, CaO is 2.4...

Embodiment 2

[0015] A magnesia-aluminum spinel / Sialon composite ceramic material and a preparation method thereof, comprising 35-40wt% aluminum ash, 1-10wt% light-burned magnesia, 0.1-5wt% fused magnesia, 40-55wt% Bauxite clinker fine powder, 0.1-10wt% elemental silicon fine powder, 2-15wt% silicon micropowder, 5-30wt% quartz powder are mixed, stirred and shaped, and the formed green body is placed in a nitrogen atmosphere In the electric arc furnace, first heat up to 1000-1100°C, keep it warm for 2-5 hours, then heat it up to 1300-1350°C at a heating rate of 2-5°C / min, keep it warm for 3-6 hours, and then heat it up at 2-5°C / min The heating rate is increased to 1360-1500°C, kept for 5-10 hours, and finally cooled to room temperature naturally under the protection of nitrogen.

[0016] The chemical composition of aluminum ash is: Al 2 o 3 56.21%, Al 23.56%, MgO 0.48%, SiO 2 2.25%, Na 2 O is 1.1%, CaO is 0.74%, TiO 2 0.63%, Fe 2 o 3 1.23%, ignition loss 11.68%, and others 2.1%. The ...

Embodiment 3

[0019]A magnesia-aluminum spinel / Sialon composite ceramic material and a preparation method thereof, comprising 45-50wt% of aluminum ash, 0.1-3wt% of fused magnesia, 1-5wt% of sintered magnesia, 20-30wt% of Bauxite clinker fine powder, 5-10wt% metal aluminum fine powder, 0.1-10wt% quartz powder and 1-5wt% quartz glass powder are mixed, stirred and shaped, and the shaped green body is placed in a nitrogen atmosphere In an induction furnace, first heat up to 1000-1100°C, keep it warm for 3-3.5 hours, then heat it up to 1300-1350°C at a heating rate of 3-4°C / min, keep it warm for 3-3.5 hours, and then heat it at 2-4°C / min heating rate to 1360~1500℃, keep warm for 6~6.5h, and finally cool down to room temperature naturally under the protection of nitrogen.

[0020] The chemical composition of aluminum ash is: Al 2 o 3 63.57%, Al 3.69%, MgO 6.57%, SiO 2 6.63%, Na 2 O is 1.85%, CaO is 1.91%, TiO 2 0.58%, Fe 2 o 3 is 1.33%, ignition loss is 10.28wt%, and other is 3.56%. The ...

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Abstract

The present invention relates to one kind of composite magnesia-alumina spinel / Sialon ceramic material and its preparation process. The technological scheme is that the materials including alumina ash 25-95 wt%, fine magnesia powder 0.1-2 wt%, fine bauxite chamotte 0.5-55 wt%, fine silicon powder 0-30 wt%, fine aluminum powder 0-10 wt% and fine SiO2 powder 0-50 wt%, are prepared into the composite magnesia-alumina spinel / Sialon ceramic material through mixing, forming into biscuit, sintering in nitrogen atmosphere first at 1000-1100 deg.c for 0.5-5 hr, then at 1300-1350 deg.c reached in the rate of 2-5 deg.c / min for 1-6 hr and finally at 1360-1500 deg.c reached in the rate of 2-5 deg.c / min for 2-10 hr, and naturally cooling to room temperature in nitrogen atmosphere. The present invention has waste alumina ash as main material, environment friendship and low production cost.

Description

technical field [0001] The invention relates to the technical field of composite refractory production. In particular, it relates to a magnesium aluminum spinel / Sialon composite ceramic material and a preparation method thereof. Background technique [0002] Aluminum ash is a large part of the solid waste generated in the electrolytic aluminum industry and the production of aluminum materials and aluminum products. The chemical composition of aluminum ash is mainly Al 2 o 3 , SiO 2 , MgO, Fe 2 o 3 , Na 2 O, CaO and metal aluminum are mainly, and some nitrides, chlorides and sulfides, etc., in general, SiO 2 The content is 0.5~30%, Al 2 o 3 The content is 10-75%, and the proportion of its chemical composition varies slightly with the raw materials and operating conditions of various manufacturers. [0003] Aluminum ash is usually discarded as garbage, which not only pollutes the environment, but also requires a large amount of disposal sites and high processing cost...

Claims

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Application Information

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IPC IPC(8): C04B35/443C04B35/599C04B35/64
Inventor 李远兵孙莉金胜利李亚伟赵雷李淑静常娜雷中兴
Owner WUHAN UNIV OF SCI & TECH
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