Method for manufacturing foam ceramic heat-insulation plate with closed pores

A technology for foaming ceramics and thermal insulation boards, which is applied to ceramic products, other household appliances, household appliances, etc., can solve the problems of difficult foaming ceramics, complicated processes, and limited use, and achieves low thermal conductivity, good application prospects, and density. low effect

Active Publication Date: 2012-07-25
JIANGSU SOUTH PORCELAIN INSULATOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above two kinds of processes are complicated, the cost is high, and the large-s

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0017] Example 1:

[0018] 1. Raw material preparation: Dry fly ash, talcum powder, Ninghai soil micropowder and glass powder for later use. in:

[0019] Fly ash is a national standard first-class dry fly ash, and its main component (by weight) is SiO 2 50~60%, Al 2 o 3 30~40%, Fe 2 o 3 4~8%, CaO 3~5%, and oxides of other elements such as magnesium, potassium, and sodium account for 5%~10%; the powder passes through a 200-mesh sieve, and the sieve residue is less than 5%;

[0020] Ninghai soil is a local natural clay in Ninghai, Zhejiang, the main component (by weight) SiO 2 50~60%, Al 2 o 3 20~30%, Fe 2 o 3 4~8%, and the oxides of magnesium, potassium, sodium, calcium and other elements accounted for 5%~10%; Up to 0.1% (wt), finally use Ninghai soil: ball = 1: 1 to carry out dry grinding for 6~12h and pass through a 200-mesh sieve to obtain micropowder, in which the ball is alumina ball stone with a particle size of 0.5~2cm;

[0021] Talc powder is 400-mesh talc f...

Example Embodiment

[0025] Embodiment 2: raw material fly ash, talcum powder, Ninghai soil micropowder, glass powder composition are all identical with embodiment 1; Difference is the step of the consumption of each raw material and the preparation of closed-cell foamed ceramic insulation board, specifically as follows:

[0026] Select 18% of Ninghai soil micropowder, 50% of fly ash, 10% of talcum powder, 20% of glass powder, 1% of silicon carbide micropowder, and 1% of 320 mesh Glauber’s salt micropowder. Alumina balls with a particle size of 0.5cm are used as the grinding medium, and the mixed powder is obtained by dry ball milling for 1.5 hours according to the ratio of mixture:grinding medium=1:3; then the mixed powder is spread on the bottom with alumina powder At the same time, the four walls of the sagger are also coated with alumina slurry, and the mixed powder is evenly spread in the sagger, and the height of the mixed powder is about 1 / 3 of the height of the sagger; Under an oxidizing a...

Example Embodiment

[0027] Embodiment 3: Raw material fly ash, talcum powder, Ninghai soil micropowder, glass powder composition are all identical with embodiment 1; Difference is the step of the consumption of each raw material and the preparation of closed-cell foamed ceramic insulation board, specifically as follows:

[0028] Select 25% of Ninghai soil micropowder, 64% of fly ash, 5.3% of talcum powder, 5% of glass powder, and 0.7% of silicon carbide micropowder. The ball stone is used as the grinding medium, according to the ratio of mixture: grinding medium = 1:2.5, dry ball milling for 2 hours to obtain the mixed powder; The four walls are also coated with alumina slurry, spread the mixed powder evenly inside the sagger, the height of the mixed powder is about 1 / 3 of the height of the sagger; then in an oxidizing atmosphere, at room temperature ~ 600 ° C Heating between 7h, 600~1000℃ for 3h, 1000~1230℃ for 6h, after sintering, keep at 1230℃ for 2h, then turn off the fan, block the flue, and...

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Abstract

The invention discloses a method for manufacturing a foam ceramic heat-insulation plate with closed pores. The method includes mixing from 50 to 70% of fly ash, from 10 to 25% of Ninghai clay micro-powder, from 5 to 20% of glass powder, from 5 to 10% of talc powder and from 0.7 to 3% of foaming agent to obtain mixture, and dry-grinding the mixture to obtain uniformly mixed powder; and flatly laying the powder in a sagger with alumina powder flatly laid at the bottom, sintering the powder in a sagger with the alumina powder flatly laid at the bottom in oxidizing atmosphere at the temperature ranging from 1230 DEG C to 1260 DEG C, for 0.5 to 2 hours, cooling along with a furnace, and obtaining the foam ceramic heat-insulation plate. The fly ash is used as a main raw material for manufacturing the foam ceramic heat-insulation plate, and accordingly the method is favorable for saving natural resources, reducing production cost and protecting environments. In addition, the fly ash has hollow micro-beads and a honeycomb body which have characteristics of low heat conductivity, high-temperature resistance and the like. Besides, the closing porosity of foam ceramics reaches 75% at least, and the tensile strength reaches 0.2MPa at least.

Description

technical field [0001] The invention belongs to the technical field of synthesis of inorganic non-metallic materials, in particular to a method for preparing a closed-cell foamed ceramic insulation board by using waste fly ash as a main raw material. Background technique [0002] Foamed ceramics is a new type of material developed in the 1970s. It has excellent properties such as high porosity, low thermal conductivity, light weight, high hardness, thermal shock resistance, high temperature resistance, corrosion resistance and good mechanical strength. It can be used as an ideal building thermal insulation material. At present, the methods for preparing foamed ceramics mainly include powder green body foaming method and slurry foaming method (Liu Peisheng. Introduction to Porous Materials [M]. Tsinghua University Press). The powder body foaming method is to use foaming agents such as calcium carbonate, calcium hydroxide, aluminum sulfate and hydrogen peroxide to prepare gre...

Claims

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Application Information

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IPC IPC(8): C04B38/02
Inventor 杨志峰朱文浩刘少华董显林黄蕴君仲伯煊罗杰
Owner JIANGSU SOUTH PORCELAIN INSULATOR CO LTD
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