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In-situ starch solidifying formation process to prepare ceramic biscuit

A ceramic material, solidification molding technology, applied in the field of ceramic materials, to achieve the effects of low price, strong practicability, and a wide range of sources

Inactive Publication Date: 2003-08-20
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because these technologies have environmental and cost problems to varying degrees, and some technologies still have certain limitations, the development of new ceramic forming technologies is still one of the important directions for the development of ceramic forming processes in the 21st century.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: Preparation of carbon powder body for pure carbon reaction sintering silicon carbide material

[0023] (1) Preparation of ceramic slurry

[0024] First, according to the proportion of its components (wt%), the industrial carbon raw materials are calcined petroleum coke (average particle size 5-20 μm) 78, filler SiO 2 (average particle size 5-10 μm) 21.47, sodium lignosulfonate dispersant 0.5, defoamer 0.03 After metering, add water and ball mill for 1-2 hours to make a ceramic puree with a solid content higher than 50vol%. Then, according to calcined petroleum coke and SiO 2 Wheat starch is added in an amount of 3-5wt% of the dry basis of the raw material, ball milled for 15 minutes, and the remaining air bubbles generated in the pulping process are removed by vacuuming to obtain a ceramic slurry.

[0025] (2) Gelatinization molding

[0026]Put the mold filled with ceramic slurry into a water bath device or a constant temperature oven to heat to the starch...

Embodiment 2

[0033] Example 2: Molding preparation for reaction sintered silicon carbide material green body

[0034] (1) Preparation of ceramic slurry

[0035] First, according to the proportion of its components (wt%), silicon carbide powder (average particle size 5-80 μm) 86, petroleum coke (average particle size 5-20 μm) 13.5, sodium polyacrylate dispersant 0.5, add water , after ball milling and mixing for 1-2 hours, a ceramic puree with a solid phase content of 60 vol% was prepared. Then, add cornstarch and 1-2% hydrolyzed starch according to the amount of silicon carbide and petroleum coke dry basis of 15wt%, and then ball mill for 15-30 minutes, and remove the gas in the slurry by vacuuming to obtain ceramic slurry .

[0036] (2) Subsequent operations, i.e. gelatinization molding, demoulding, drying and carbonization are the same as in Example 1.

[0037] The strength of the dry billet molded according to this formula can reach more than 4.0MPa.

Embodiment 3

[0038] Embodiment 3: for the green body molding of quartz glass ceramics

[0039] (1) Preparation of ceramic slurry

[0040] Firstly, according to the ratio (wt%) of its components, the fused silica glass powder is divided into coarse particle size (average particle size 300 μm) 30, medium particle size (average particle size 35-55 μm) 50, fine particle size (average particle size 2-5μm)20 ratio gradation, adding water, and ball milling for 1-2 hours to make a ceramic puree with a solid content higher than 50vol%. Then, add potato starch according to the mass of quartz glass powder at 1.0 wt%, add acetic acid to adjust the pH value of the mud to 3, and make mud with a water content of about 45 vol%. Subsequent procedures are with embodiment 1.

[0041] (2) Gelatinization molding

[0042] Except that the gelatinization temperature is raised to 85° C., all the other steps are the same as in Example 1.

[0043] (3) demoulding

[0044] The demoulding of wet base is the same w...

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Abstract

The in-situ starch solidifying formation process to prepare ceramic biscuit includes adding starch in 1-15 wt% into ceramic slurry with solid content over 50 vol% and water as dispersing medium to prepare pH 3-10 ceramic slurry through homogeneous mixing; casting into mold, heating to 60-85 deg.c for solidification to fix powder particle in ceramic slurry and drying to make ceramic biscuit; and heating to oxidize and eliminate the introduced starch organic matter or carbonizing the organic matter into ceramic biscuit component. The present invention is practical, simple in production process, wide in material source, low in cost, without environmental pollution and high in product performance.

Description

technical field [0001] The invention relates to the field of ceramic materials, in particular to a method for preparing a body of ceramic material by in-situ solidification and molding of starch. Background technique [0002] Molding is a key link in the preparation process of ceramic materials, which directly affects the microstructure and material properties of materials. There are dry method, colloidal molding process, etc. for ceramic green body molding. Colloidal molding includes traditional colloidal molding and new colloidal molding process. Colloidal molding refers to the method of preparing ceramic green body by using the colloidal characteristics of ceramic powder, such as grouting, tape casting, casting, spinning, etc. Compared with dry molding, it is easy to control the agglomeration and impurities of the blank, It overcomes the defects of poor uniformity and low density of the dry-pressed green body, and has the advantages of being able to prepare various ceram...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622C04B35/636
Inventor 武七德赵修建李美娟吉晓莉韩建军郭兵健刘小磐
Owner WUHAN UNIV OF TECH
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