A production process of foamed ceramic secondary cloth

Abstract

The invention provides a production process for secondary distribution of foamed ceramics, which includes the following steps: Step 1: spread the first layer of foaming powder containing silicon carbide in the refractory kiln furniture, and scrape it flat; then spread the second layer High-temperature powder, scraped; step 2: send it into the kiln for firing, and the firing temperature is 1150 ° C ~ 1200 ° C; after cooling out of the kiln, take out the foamed ceramic blank from the kiln furniture; step 3: obtain in step 2 The foamed ceramic blank is polished and processed to remove the burnt product of the high-temperature powder on the surface, and finally cut into the required shape product according to the demand; the firing temperature of the high-temperature powder in step 1 is greater than that of the foamed powder Firing temperature. The present invention well solves the defects of through pores and / or large pores in the foamed ceramics caused by preheating and exhausting before firing through a simple secondary material distribution process, and the generated residues can be recycled.

Description

technical field [0001] The invention relates to the field of ceramic material production, in particular to a production process for secondary distribution of foamed ceramics. Background technique [0002] Foamed ceramics refer to lightweight ceramic materials with holes inside, which have the characteristics of light weight and can be used as masonry materials. The production of foamed ceramics is mainly by introducing a foaming agent into the formula. During the high-temperature firing stage, the gas generated by the foaming agent is enclosed in the molten liquid phase generated at high temperature, and forms pores after cooling. In the production process of foamed ceramics, the organic matter, carbonate, and sulfate substances in the powder must be fully decomposed and discharged at the low temperature stage in the front section of the kiln before entering the medium-high temperature firing stage, otherwise it will be fired due to low temperature. The gas in the exhaust s...

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Problems solved by technology

At the same time, such a setting method is also conducive to the transfer of heat, compensates for the uneven foaming caused by the temperature gradient, speeds up the heating rate of the foaming and firing stage, reduces the holding time at the foaming temperature, and shortens the production of the entire foamed ceramic material. Period; the patent "A Foamed Ceramic and Its Preparation Method" (CN 107759246 A) proposes to mix the raw materials evenly according to the proportion, and then make the uniformly mixed powder into 10-60 mesh granules, and then put the granules into Heat treatment in the mold can produce foamed ceramics with light weight, high strength and low thermal conductivity. However, this process has problems such as large particle size differences and poor fluidity of the powder. The inner fabric is uniform and the porosity of each position is also quite different, which will seriously affect the product quality, such as product foaming pore size, pore size uniformity, etc.

[0006] In addition, at present, foamed ceramics are mainly used for wall masonry, so their thickness is mostly greater than 20mm, which requires that the thickness of the green body must also reach a certain thickness during firing, which also aggravates the damage caused by the large temperature difference in the vertical section. Adverse effects, and the current solutions are mostly costly, complex process, and difficult to operate, so there is an urgent need for a simple and effective solution to improve the production process of foamed ceramics caused by the gas in the exhaust stage being sealed in the body by the molten liquid phase. through and / or macrovoid defects

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