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Method for controlling the gelation and syneresis process of gel casting by high-valent metal ions

A technology of high-priced metal ions and metal ions, which is applied in the field of molding of ceramic bodies, can solve the problems of easily causing sedimentation, long time, affecting production efficiency, etc., and achieves the effects of promoting cross-linking, improving efficiency and simple preparation process.

Active Publication Date: 2016-10-12
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in further research on the water-soluble butene-based gel system, it was found that the gel solidification stage before drying was too long, which easily caused sedimentation and affected production efficiency.

Method used

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  • Method for controlling the gelation and syneresis process of gel casting by high-valent metal ions
  • Method for controlling the gelation and syneresis process of gel casting by high-valent metal ions
  • Method for controlling the gelation and syneresis process of gel casting by high-valent metal ions

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Example 1: Preparation of Ceramic Slurry Introducing Magnesium Ions from Aluminum Oxide

[0042] The alumina ceramic powder used is provided by Sumitomo Chemical Co., Ltd., Japan, with an average particle size of about 0.45 μm. Add 0.6g of a butene-based polymer with a combination of long and short chains to 50g of deionized water, then add 0~0.205g (0~160ppm) of magnesium nitrate hexahydrate, mix and dissolve in water for 10 minutes, and then add 200g of alumina ceramic powder , mixed with a planetary ball mill and milled for 30 minutes for later use. The appropriate amount of magnesium ions added is selected by testing the rheological curve and the gelation and solidification curve of the slurry. figure 1 Show the rheological curve of the alumina slurry of the different magnesium ion content that this embodiment obtains, by figure 1 It can be seen that the greater the amount of magnesium ions added, the greater the viscosity of the slurry. figure 2 Show the storag...

Embodiment 2

[0043] Embodiment 2: the preparation of the ceramic slurry that zirconia introduces calcium ion

[0044] Add 1.08g of long-short-chain combined butene-based polymers to 50g of deionized water, then add 0-0.072g (0-200ppm) of calcium sulfate, mix with water for 10min, and finally add 360g of zirconia ceramic powder, mix and ball-mill with a planetary ball mill Reserve after 30 minutes. The appropriate amount of calcium ions is selected by testing the rheological curve and the gelation and curing curve of the slurry. After testing, the appropriate amount of calcium ions added is 60-180ppm.

Embodiment 3

[0045] Embodiment 3: the preparation of the ceramic slurry that silicon carbide introduces yttrium ion

[0046] Add 0.48g of long-short-chain-combined butene-based polymers to 50g of deionized water, then add 0-0.032g (0-200ppm) of yttrium nitrate and mix with water for 10min, and finally add 160g of silicon carbide ceramic powder, mix and ball-mill with a planetary ball mill Reserve after 30 minutes. The appropriate addition of yttrium ions is selected by testing the rheological curve and gel-solidification curve of the slurry. After testing, the appropriate addition amount of yttrium ions is 20-140ppm.

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Abstract

The invention relates to a method for controlling a gelcasting gelatinization and syneresis process through high-valence metal ions. The method comprises the steps of: in a ceramic molding process adopting a gelcasting method, adding over-divalent metal ions into an aqueous solution of a water-soluble maleic polymer, which serves as a crosslinking-curing agent, during the preparation of ceramic slurry, mixing uniformly, and then, adding a ceramic powder material, wherein the content of the over-divalent metal ions is not higher than 200ppm relative to the ceramic powder material, and the gelatinization and syneresis process of the ceramic slurry is controlled through adjusting the amount of the added over-divalent metal ions.

Description

technical field [0001] The invention relates to a method for controlling the gelation and syneresis process of coagulation molding through high-valent metal ions, and belongs to the technical field of inorganic non-metallic ceramic molding. Specifically, it relates to a method of controlling the solidification and syneresis process of the gel system by using the bonding between high-valent metal ions and organic molecules, which can greatly shorten the gelation and syneresis time and improve production efficiency, especially It is suitable for the molding of large-sized ceramic blanks. Background technique [0002] The gelcasting process (gelcasting) developed by the Oak Ridge National Laboratory in the United States has the following advantages in the ceramic molding process: (1) the slurry is solidified in situ in the mold, and the microstructure of the green body is uniform; (2) The billet has high strength and can be machined; (3) It is a quasi-net size forming technolo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/63C04B35/10C04B35/48C04B35/565
Inventor 彭翔岛井骏臧孙怡周国红王士维
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI