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Porous foamed ceramic and preparation method thereof

A technology of porous foam and ceramics, which is applied in the field of synthesis of inorganic non-metallic materials, can solve problems such as large overall mass, uneven distribution of pores, complex process technology principles, etc., and achieve good heat insulation performance, reduced production costs, and low thermal conductivity. Effect

Active Publication Date: 2012-08-01
JIANGSU SOUTH PORCELAIN INSULATOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the current technical principles of high-temperature foamed ceramics are complicated, and the production process is not easy to control, and the raw materials used are not easy to obtain, which increases the production cost.
[0005] The pores of the foamed ceramics obtained by the existing process are unevenly distributed, and the porosity of the closed pores is low, generally between 60% and 70%.
The overall quality of the material is large, the thermal insulation performance is not good, and the mechanical properties such as the strength of the finished product are affected at the same time

Method used

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Examples

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Effect test

preparation example Construction

[0014] The preparation method of the porous foamed ceramics of the present invention is to use cheap common ceramic flux raw material feldspar as the main raw material, glass powder as the low melting point raw material, white clay or high alumina clay as the plastic raw material, and discarded shed board silicon carbide as the foaming agent , using the high-temperature foaming method to obtain foamed ceramics with a closed-cell porosity of more than 70%. The process steps are:

[0015] 1. Raw material preparation

[0016] Feldspar: Potassium feldspar from Linxiang, Hunan, industrially pure, particle size 78μm,

[0017] Glass powder: Langfang, Hebei, its chemical composition and mass percentage are SiO 2 65%-75%, Al 2 o 3 1%-2%, CaO+MgO 10%-20%, Na 2 O+K 2 O accounts for 10%-20%, and the remaining iron, titanium, sulfur and other oxides account for about 0.6%;

[0018] White clay: select high-quality white clay, its chemical composition and mass percentage are SiO 2 60%...

Embodiment 1

[0030] Embodiment 1: choose feldspar 52%, glass powder 25%, white clay 22%, silicon carbide 1% (passes 320 mesh sieves), mixes, slurry fineness is below 0.09mm after wet ball milling 15h, through drying, After being crushed into powder, it is sintered under the condition of 1300°C and heat preservation for 1 hour in the air atmosphere, and the porous foam ceramics can be obtained after cooling. After testing by GB 10294, GB / T 9641 and other methods, the following results are obtained: the closed-cell porosity of the obtained porous foam ceramics reaches 75%, the pore diameter is 4mm, and the pores are evenly distributed. The thermal conductivity of ceramics is less than 0.1W / (m.k), and the tensile strength is greater than 0.25MPa.

Embodiment 2

[0031] Embodiment 2: choose feldspar 65%, glass powder 19%, white clay 15%, silicon carbide 1% (over 320 mesh sieves), mix, after wet ball milling 13h, slurry fineness is below 0.09mm, through drying, After being crushed into powder, it is sintered under the condition of 1250°C and heat preservation for 2 hours under the air atmosphere, and the porous foam ceramics can be obtained after cooling. After testing according to GB 10294 and GB / T 9641, the following results are obtained: the closed-cell porosity of the obtained porous foam ceramics reaches 78%, and the pore diameter is 4.6mm, which is evenly distributed. The thermal conductivity of ceramics is less than 0.08W / (m.k), and the tensile strength is greater than 0.2MPa.

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Abstract

The invention discloses a porous foamed ceramic and a preparation method thereof. The ceramic is mainly made from the following materials: 45-65% of feldspar, 10-25% of glass dust, 15-30% of white cement or high-aluminum clay and 0.05-1% of silicon carbide. The preparation method comprises the following steps of: firstly weighing the materials and adding water to obtain slurry; then, ball milling the slurry, drying and crushing; and finally sintering at a high temperature between 1200 DEG C and 1300 DEG C and cooling. The used ram materials are low in price and pollution-free, the process flow is simple and high in practical applicability and the production cost can be reduced; the base body mainly comprises feldspar solvent raw material, then low-melting-point raw materials such as glass dust are introduced, so that the initial melting temperature of the materials is reduced greatly. The porous foamed ceramic has low thermal conductivity which is equivalent to thermal mortar, has good heat insulating performance and can serve as a heat-insulating material of an external wall heat insulating system; moreover, under bad weather conditions, the porous foamed ceramic does not deform, age or crack and is stable in property.

Description

technical field [0001] The invention relates to a high-temperature foamed ceramic, in particular to a porous foamed ceramic and a preparation method thereof, belonging to the technical field of synthesis of inorganic non-metallic materials. Background technique [0002] At present, people not only pay attention to the thermal insulation performance of building materials, but also put forward higher and higher requirements for other performances, such as sound insulation, fire resistance, and decorative effects. High-temperature foamed ceramics have the above advantages, and are different from the current types of porous ceramics in terms of material and pore formation mechanism. It is a ceramic material fired at high temperature and has a large number of interconnected or closed pores in the body. It has low density, corrosion resistance, high temperature resistance and good heat insulation performance. It also has good compatibility with cement products and low water absorp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/02C04B35/16C04B35/622
Inventor 杨志峰朱文浩刘少华董显林黄蕴君罗杰仲伯煊
Owner JIANGSU SOUTH PORCELAIN INSULATOR CO LTD
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