Alumina light-weight brick and preparation method thereof

A lightweight brick and alumina technology, applied in the field of lightweight refractory materials, can solve the problems of high energy consumption, limited application range and high thermal conductivity of alumina hollow spheres, and achieve high strength, low bulk density and low thermal conductivity. Effect

Inactive Publication Date: 2010-05-19
WUHAN UNIV OF SCI & TECH
View PDF1 Cites 18 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantages of this method are: (1) the scope of application of this method is limited; (2) the preparation of alumina hollow

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0011] Example 1:

[0012] A light-weight alumina brick and a preparation method thereof. With 50~55wt% of α-Al 2 O 3 Fine powder, 25~30wt% α-Al 2 O 3 Micropowder and 15-20wt% ρ-Al 2 O 3 Micro powder as raw material, plus 0.1~0.3wt% TiO 2 Micropowder, 30~35wt% water, 0.1~0.3wt% polycarboxylic acid type water reducing agent and 0.1~0.5wt% silica powder, mix for 3~5 minutes, and then add 0.2~0.3wt% foaming agent ; Mix uniformly, cast into shape, fired at 1450~1550℃ after drying, heat preservation for 3~5 hours.

[0013] The bulk density of the alumina lightweight brick prepared in Example 1 is 0.7~1.0g / cm 3 , The thermal conductivity is 0.2~0.5w / (m.k), the compressive strength reaches 5~15Mpa.

Example Embodiment

[0014] Example 2:

[0015] A light-weight alumina brick and a preparation method thereof. With 55~65wt% of α-Al 2 O 3 Fine powder, 20-25wt% α-Al 2 O 3 Micropowder and 10-20wt% ρ-Al 2 O 3 Micropowder as raw material, add 0.3~0.5wt% MgO powder, 35~40wt% water, 0.1~0.3wt% lignin-based water reducing agent and 0.5~1wt% silica sol, mix for 3~5 minutes, then add 0.3-0.4wt% foaming agent, mixed uniformly, poured into molding, dried and fired under the condition of 1550-1600 DEG C, and kept for 3 to 5 hours.

[0016] The bulk density of the alumina lightweight brick prepared in Example 2 is 0.8~1.0g / cm 3 , The thermal conductivity is 0.3~0.5w / (m.k), and the compressive strength reaches 6~15Mpa.

Example Embodiment

[0017] Example 3:

[0018] A light-weight alumina brick and a preparation method thereof. With 60~65wt% of α-Al 2 O 3 Fine powder, 15~25wt% α-Al 2 O 3 Micropowder and 10-20wt% ρ-Al 2 O 3 Micropowder as raw material, plus 0.1~0.5wt% Cr 2 O 3 Micropowder, 40~45wt% water, 0.1~0.5wt% Nai-based water reducing agent and 0.1~1wt% nano silica, mix for 3~5 minutes, then add 0.3~0.4wt% foaming agent, mix well , Pouring and molding, after drying, sintering under the condition of 1600~1650℃, heat preservation for 3~5 hours.

[0019] The bulk density of the alumina lightweight brick prepared in Example 3 is 0.7~0.9g / cm 3 , The thermal conductivity is 0.2~0.5w / (m.k), and the compressive strength reaches 6~12Mpa.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Bulk densityaaaaaaaaaa
Thermal conductivityaaaaaaaaaa
Compressive strengthaaaaaaaaaa
Login to view more

Abstract

The invention relates to an alumina light-weight brick and a preparation method thereof. The method adopts the technical scheme that: 50 to 80 weight percent of Al2O3 fine powder, 15 to 30 weight percent of alpha-Al2O3 micro-powder and 5 to 20 weight percent of rho-Al2O3 micro-powder serving as raw materials are mixed with 0.1 to 1 weight percent of sintering aid, 30 to 50 weight percent of water, 0.1 to 1 weight percent of water reducer and 0.1 to 2 weight percent of SiO2 for 3 to 5 minutes; furthermore, the mixture and 0.2 to 0.4 weight percent of foaming agent are mixed uniformly, and are cast and molded; and the mold is sintered at the temperature of between 1,450 and 1,700 DEG C after being dried, and is insulated for 3 to 5 hours. The method has the characteristics of simple process and energy conservation; and the prepared alumina light-weight brick has the volume density of between 0.6 and 1.1g/cm3, the heat conductivity of between 0.2 and 0.6w/(m.k) and the compression strength of 5 to 15Mpa, and has the advantages of higher strength, small volume density and low heat conductivity compared with hollow ball products.

Description

technical field [0001] The invention belongs to the technical field of lightweight refractory materials, and in particular relates to an alumina lightweight brick and a preparation method thereof. Background technique [0002] Energy conservation is one of the important measures to maintain sustainable economic development. Thermal insulation is one of the important measures for energy saving. Therefore, thermal insulation materials with micro-nano pores play an important role in the field of thermal insulation. Thermal insulation materials refer to materials with high porosity, low bulk density and low thermal conductivity. In order to operate in various atmospheres (air, H 2 , N 2 and CO, etc.), to meet the high-temperature heat treatment process requirements of metals, non-metals and their products, and to reduce energy consumption, many scientific and technological personnel are committed to researching lightweight insulation materials used at high temperatures (1750-...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C04B35/66C04B35/101C04B35/64
Inventor 李远兵李晓星赵雷吴清顺李亚伟黄凯李绍康冯斌金胜利李淑静桑绍柏
Owner WUHAN UNIV OF SCI & TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap