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Method for solidifying ceramic slurry through controlling high-valent contra-ion by slowly adjusting pH value

A technology of ceramic slurry and counter ions, applied in the field of inorganic non-metallic ceramic curing, can solve the problems of complex coating process, and achieve the effects of high dimensional accuracy, short curing time and smooth surface

Inactive Publication Date: 2014-05-07
TSINGHUA UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] In order to overcome the shortcomings of the existing high-valent counterion direct solidification molding method that requires heat treatment and the coating process is relatively complicated, the purpose of the present invention is to provide a method for controlling high-valent counterion solidification ceramic slurry by slowly adjusting the pH value. Can be used for different types of ceramic slurry, and the process is simpler

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  • Method for solidifying ceramic slurry through controlling high-valent contra-ion by slowly adjusting pH value

Examples

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Effect test

Embodiment 1

[0031] Embodiment 1: the selection of pH regulator

[0032] In order to overcome the defect that the conventional pH regulator adjusts the pH too quickly and partially solidifies the ceramic slurry, the present invention screens and obtains several pH regulators with the function of slowly adjusting the pH.

[0033] Mix the dispersant, water and ceramic powder evenly, wherein the mass of the dispersant is 0.1% to 2.5% of the mass of the ceramic powder, and after ball milling for 12 to 48 hours, a negatively charged ceramic slurry is obtained on the surface of the particles, and the pH regulator Diacetin, glyceryl triacetate, gluconolactone or adipic acid were added to the ceramic slurry, the initial pH value of the ceramic slurry was 10.6, and they were left standing at 25°C and 30°C respectively, and every Measure the pH value of the ceramic slurry once every 30 minutes. The test results are shown in Table 1. The above-mentioned pH regulator can slowly adjust the pH of the c...

Embodiment 2

[0037] Embodiment 2: Using calcium citrate as the method of direct solidification molding of alumina ceramic slurry as curing agent

[0038] The specific steps are the same as in Comparative Example 1, but by adding 2 grams of glyceryl diacetate as a pH regulator, stirring in a vacuum for 10 minutes to remove air bubbles, pouring it into a glass mold, and demolding it after standing at room temperature for 2 hours to obtain a ceramic wet body. The pH value of the slurry was lowered to 8, and dried at 80°C for 24 hours to obtain a dry body. The dry body was placed in an electric furnace, and the temperature was raised to 1550°C at a heating rate of 5°C per minute, and kept for 2 hours to obtain a ceramic sintered body.

Embodiment 3

[0039] Embodiment 3: the method for direct solidification molding of zirconia ceramic slurry using magnesium citrate as curing agent

[0040]305 grams of zirconia, 5 grams of ammonium polyacrylate and 50 grams of water were mixed and ball milled for 24 hours to prepare a ceramic slurry with a solid phase volume fraction of 50%. Add 2 grams of magnesium citrate and 3 grams of glyceryl triacetate, stir in vacuum for 10 minutes to remove air bubbles, inject it into a plastic mold, leave the mold at room temperature for 4 hours, and then demould to obtain a ceramic wet body. During this process, the pH value of the ceramic slurry is reduced to 6. Dry at 80°C for 24 hours to obtain a dry compact, place the dry compact in an electric furnace, raise the temperature to 1600°C at a rate of 5°C per minute, and keep the temperature for 1 hour to obtain a ceramic sintered body.

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Abstract

The invention discloses a method for solidifying ceramic slurry through controlling high-valent contra-ion by slowly adjusting pH value, and belongs to the technical field of inorganic nonmetal ceramic solidification. The method comprises the following steps: firstly mixing a dispersing agent, water and ceramic powder, carrying out full ball-milling so as to obtain the ceramic slurry, particle surfaces of which have negative electricity, then adding high-valent metal cation-containing citrate and a pH value conditioning agent to the ceramic slurry, degassing the ceramic slurry in vacuum, then injecting the ceramic slurry into a hole-free mold, standing for 2-8 hours at the temperature of 15-30 DEG C, demolding so as to obtain a ceramic wet biscuit, and drying so as to obtain a dry biscuit; and finally sintering at the temperature of 1200-1800 DEG C so as to obtain a ceramic sintering body. The density of the biscuit obtained by the method is 55%-60% of the theoretical density, the shrinking percent of the biscuit is 2%-4%, the density of the sintering body is greater than 99% of theoretical density, and the shrinking percent of the sintering body is 17%-22%; the sintering body has the advantages of applicability of multiple ceramic systems, no need for heating treatment, environmental protection, excellent performances and the like. The method is simple and convenient for large-scale production.

Description

technical field [0001] The invention relates to the technical field of inorganic non-metallic ceramic solidification, in particular to a method for slowly adjusting the pH value of the ceramic slurry to control high-valent counterions to solidify ceramic slurry, that is, slowly adjusting the pH value of the ceramic slurry to decompose citrate and release high-valent counterions. The ions are used to realize the direct solidification of ceramic slurry. Background technique [0002] Ceramic colloidal molding has the advantages of low cost, simple operation, suitable for preparing ceramic parts with complex shapes, and avoids complicated machining steps, and has attracted widespread attention at home and abroad. The colloidal molding method does have unparalleled advantages in the preparation of complex-shaped ceramic parts, and can effectively control the microstructure of the material to reduce various defects inside the material, and improve the mechanical properties and rel...

Claims

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Application Information

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IPC IPC(8): C04B35/622
Inventor 杨金龙许杰渠亚男齐飞王亚利张笑妍
Owner TSINGHUA UNIV
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