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Method for preparing closed pore foam ceramic

A technology of foam ceramics and closed pores, which is applied to ceramic products, household utensils, and other household appliances. It can solve the problems of poor uniformity of pores and the inability to improve the closed porosity of foam ceramics, and achieves the effect of good weak acid resistance.

Inactive Publication Date: 2011-01-26
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can improve the open porosity (> 70%) of fired products, and has good strength again, but can not improve the closed porosity of foamed ceramics, and the uniformity of pores is relatively poor (development status of foamed ceramics preparation method, ceramics , Issue 2, 2009)

Method used

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Examples

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preparation example Construction

[0008] The preparation method of the closed-pore foamed ceramics of the present invention uses industrially discarded high-alumina refractory bricks as the base material, calcium sulfate as the foaming agent, silicon carbide micropowder as the pore-forming agent, and albite and hard clay as the mineralizer. Foaming agent-pore forming agent combined pore-forming method to obtain foamed ceramics with a closed-cell porosity of more than 75%. The process steps are:

[0009] 1. Raw material preparation:

[0010] High-alumina refractory bricks: The solid discarded high-alumina refractory bricks are crushed, finely ground into powder, and passed through a 325-mesh sieve. Among them, its chemical composition and mass percentage are SiO 2 55%-70%, Al 2 o 3 It accounts for 30%-37%, and the rest is oxides of iron, calcium, magnesium and potassium, accounting for 2%-7%.

[0011] Hard clay: choose the first-grade hard clay produced by Jinan Huier Hard Clay Co., Ltd. Its main mineral p...

Embodiment 1

[0025] Select 65% waste high-alumina refractory materials, crush and finely grind them into powder, and pass through a 325-mesh sieve. Add 28% of hard clay, 1% of feldspar, 1% of calcium sulfate, and 5% of silicon carbide micropowder, mix and ball mill for 20 hours, press filter the slurry, dry and stale for 3 days, add polyvinyl alcohol binder (0.5 ml / 10g), press molding under 30MPa pressure, and sinter under the condition of air atmosphere, 1350 degrees, and heat preservation for 2 hours. The closed porosity of the obtained foamed ceramics is 78%, and the pore diameter is 4.5mm, which is evenly distributed in the ceramic sintered body. Ceramic bulk density is 0.07g / cm 3 , the flexural strength reaches 1.1MPa.

Embodiment 2

[0027] Select 65% waste high-alumina refractory materials, crush and finely grind them into powder, and pass through a 325-mesh sieve. Add 12% of hard clay, 2% of feldspar, 5% of calcium sulfate, and 16% of silicon carbide micropowder, mix and ball mill for 24 hours, press filter, dry and stale for 3 days, add polyvinyl alcohol binder (0.5 ml / 10g), machine-pressed at 45MPa, sintered in an air atmosphere at 1370 degrees and kept warm for 4 hours. The closed porosity of the obtained foamed ceramics is 85%, and the pore diameter is 4.0 mm, which is evenly distributed in the ceramic sintered body. Ceramic bulk density is 0.06g / cm 3 , the flexural strength reaches 1.3MPa.

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PUM

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Abstract

The invention discloses a method for preparing closed pore foam ceramic, which adopts a high-decomposition-temperature calcium sulfate foaming agent and a inorganic high-temperature silicon carbide oxide pore-forming agent to compositely form pores, and comprises the following steps: mixing the following ingredients in percentage by weight: 65%-75% of high-alumina refractory brick, 10%-30% of hard clay, 0.1% -2% of feldspar, 4%-6% of calcium sulfate and 4% -20% of silicon carbide micro powder; and carrying out ball-milling, carrying out filter-pressing, drying, ageing, carrying out mechanical pressing, sintering at a temperature of 1350 DEG C -1400 DEG C in air atmosphere, and cooling to the room temperature to obtain the foaming ceramic with closed porosity up to 75%. The invention adopts the high-decomposition-temperature calcium sulfate foaming agent and the inorganic high-temperature silicon carbide oxide pore-forming agent to compositely form the pores, and can obviously increase the closed porosity of the foaming ceramic to over 75% from 58%.

Description

technical field [0001] The invention belongs to the technical field of synthesis of inorganic non-metallic materials, in particular to a preparation method of closed-pore foamed ceramics. Background technique [0002] Foamed ceramics is a new type of ceramic material, which is made by firing at high temperature after molding, and has a large number of interconnected or closed pores. Because of the interpenetrating micropores or cavities distributed inside it, it has many excellent properties such as low density, good permeability, low thermal conductivity, high temperature resistance, wear resistance, corrosion resistance, etc., and is widely used in energy, Chemical industry, construction, aerospace and many other fields. Such materials are based on parameters such as pore size, shape, quantity, and distribution, combined with the properties of the matrix material itself to achieve its performance characteristics. Therefore, how to control the size, shape, quantity and di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/02
Inventor 彭东文崔崇陈光石晓琴萘建中
Owner NANJING UNIV OF SCI & TECH
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