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High-strength calcium hexa-aluminate light heat insulation material and preparation method thereof

A lightweight thermal insulation, calcium hexaaluminate technology, applied in the field of lightweight refractory materials, can solve the problems of easy cracking of products, environmental pollution, high temperature performance effects of products, etc., and achieves low thermal conductivity, low bulk density, and uniform distribution. Effect

Active Publication Date: 2014-01-08
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method also has the following disadvantages: (1) the product is easy to crack due to its elastic aftereffect in the process of product preparation by using the burn-out pore-forming agent; , some inorganic substances are easy to remain, which will affect the high-temperature performance of the product; (3) The burning of the pore-forming agent will pollute the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A high-strength calcium hexaaluminate lightweight heat-insulating material and a preparation method thereof. With 70~73wt% Al 2 o 3 Fine powder, 7~8wt% ρ-Al 2 o 3 Micropowder and 20~22wt% nano CaCO 3 As a raw material, add 0.05~0.10wt% water reducing agent and 68~80wt% water of the raw materials, and mix for 30~55min to obtain a premix; then add foam to the premix, and add the foam in the premix The amount is 0.1~0.4L per kg of raw materials, mixed for 3~8 minutes, poured and molded, and dried naturally; then baked at 90~110°C for 24 hours, and kept at 1430~1480°C for 3~6 hours to obtain high-strength six Calcium aluminate lightweight insulation.

[0027] In this embodiment: Al 2 o 3 The fine powder is fused white corundum fine powder; the water reducer is sodium hexametaphosphate.

[0028] The high-strength calcium hexaaluminate lightweight heat insulation material prepared in this example is tested: the bulk density is 0.48~0.60g / cm 3 ; The thermal conductivi...

Embodiment 2

[0030] A high-strength calcium hexaaluminate lightweight heat-insulating material and a preparation method thereof. With 73~76wt% Al 2 o 3 Fine powder, 6~7wt% ρ-Al 2 o 3 Micropowder and 18~20wt% nano CaCO 3 As a raw material, add 0.10~0.15wt% water reducing agent and 56~68wt% water of the raw materials, mix for 55~80min to obtain a premix; then add foam to the premix, and add the foam in the premix The amount is 0.4~0.8L per kg of raw materials, mixed for 3~8 minutes, poured and molded, and dried naturally; then baked at 90~110°C for 24 hours, and kept at 1480~1530°C for 3~6 hours to obtain high-strength six Calcium aluminate lightweight insulation.

[0031] In this embodiment: Al 2 o 3 The fine powder is sintered corundum fine powder; the water reducer is lignin-based water reducer.

[0032] The high-strength calcium hexaaluminate lightweight heat insulation material prepared in this example is tested: the bulk density is 0.35~0.52g / cm 3 ; The thermal conductivity is...

Embodiment 3

[0034] A high-strength calcium hexaaluminate lightweight heat-insulating material and a preparation method thereof. With 76~79wt% Al 2 o 3 Fine powder, 5~6wt% ρ-Al2 o 3 Micropowder and 16~18wt% nano CaCO 3 As a raw material, add 0.15~0.20wt% of the water reducer and 44~56wt% of the raw materials, and mix for 80~105min to obtain a premix; then add foam to the premix, and add the foam in the premix The amount is 0.8~1.2L per kg of raw materials, mixed for 3~8 minutes, poured and molded, and dried naturally; then baked at 90~110°C for 24 hours, and kept at 1530~1570°C for 3~6 hours, that is, high-strength six Calcium aluminate lightweight insulation.

[0035] In this embodiment: Al 2 o 3 The fine powder is industrial alumina fine powder; the water reducer is sodium tripolyphosphate.

[0036] The high-strength calcium hexaaluminate lightweight heat insulation material prepared in this example is tested: the bulk density is 0.24~0.42g / cm 3 ; The thermal conductivity is 0.12...

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Abstract

The invention relates to a high-strength calcium hexa-aluminate light heat insulation material and a preparation method thereof. The preparation method is characterized by using 70-85wt% of Al2O3 fine powder, 2-8wt% of rho-Al2O3 micro powder and 13-22wt% of nano CaCO3 as raw materials, adding a water reducer accounting for 0.05-0.30wt% of the raw materials and water accounting for 20-80wt% of the raw materials and mixing the materials for 30-150 minutes, thus obtaining a premix; then adding foam to the premix, mixing the materials for 3-8 minutes, moulding the mixture by casting and naturally drying the product; then roasting the product at 90-110 DEG C for 24 hours and insulating the product at 1430-1650 DEG C for 3-6 hours, thus obtaining the high-strength calcium hexa-aluminate light heat insulation material, wherein the addition amount of the foam in the premix is 0.1-2.0L per kg of raw materials. The high-strength calcium hexa-aluminate light heat insulation material has the characteristics of energy conservation, environment friendliness, easiness in demoulding of green bodies and easiness in sintering, has stable properties, low content of impurities, low volume density, high strength and low heat conductivity coefficient.

Description

technical field [0001] The invention belongs to the technical field of lightweight refractory materials, and in particular relates to a high-strength calcium hexaaluminate lightweight heat-insulating material and a preparation method thereof. Background technique [0002] Energy is an important basis for human survival, economic development and social progress. Energy shortage has become one of the important bottlenecks restricting human progress and development in the new century. Therefore, energy conservation has become one of the most important topics in this century. [0003] One of the reasons why calcium hexaaluminate materials attract people's attention is the anisotropy of its grain growth, the crystal nucleus grows preferentially along the basal plane, and the formed CA 6 The grains have the characteristics of flakes or flat plates, which can maintain a large specific surface area at high temperatures and have a good high-temperature heat insulation effect. These ...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 李远兵吴梦飞廖佳刘静静李淑静李亚伟桑绍柏
Owner WUHAN UNIV OF SCI & TECH
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