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A method for preparing dense chromium oxide refractories by gel injection molding

A refractory material, gel injection molding technology

Inactive Publication Date: 2015-10-28
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, few people are engaged in the research of chromium oxide gel injection molding, so the research work of gel injection molding dense chromium oxide refractories is carried out here.

Method used

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  • A method for preparing dense chromium oxide refractories by gel injection molding
  • A method for preparing dense chromium oxide refractories by gel injection molding
  • A method for preparing dense chromium oxide refractories by gel injection molding

Examples

Experimental program
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Effect test

Embodiment 1

[0026] The method for preparing dense chromium oxide refractory by gel injection molding, the steps are as follows:

[0027] Step 1. Prepare the premix: Dissolve 11.2g of acrylamide (AM) and 0.56g of cross-linking agent N,N'-methylenebisacrylamide (MBAM) in 45ml of deionized water to prepare solution A, and in solution A Add 0.85ml AN-2000 dispersant to form solution B, stir well, adjust the pH value of solution B to 8 with concentrated ammonia water, and obtain a premixed solution;

[0028] Step two, prepare ceramic slurry: add 202.8g of chromium oxide powder and 6.26g of titanium dioxide powder to the premix prepared in step one in batches, add 300g of alumina grinding balls, and ball mill at 750r / min for 4h to obtain a solid Ceramic slurry with phase content of 46vol%;

[0029] Step three, injection molding: add 1ml 50vol% catalyst tetramethylethylenediamine (TEMED) aqueous solution to the ceramic slurry prepared in step two, then add initiator ammonium persulfate 0.5ml 10wt% APS...

Embodiment 2

[0034] The method for preparing dense chromium oxide refractory by gel injection molding, the steps are as follows:

[0035] Step 1. Prepare the premix: Dissolve 2.8g acrylamide (AM) and 0.56g cross-linking agent N,N'-methylenebisacrylamide (MBAM) in 41.3ml deionized water to prepare solution A, Add 3.0ml AN-2000 dispersant to A to form solution B. After stirring well, adjust the pH value of solution B to 11 with concentrated ammonia water to obtain a premixed solution;

[0036] Step 2: Prepare ceramic slurry: same as Example 1, obtain ceramic slurry with a solid content of 48 vol%;

[0037] Step 3: Injection molding: same as Example 1, to obtain a green body;

[0038] Step 4: Drying and degreasing the green body: same as in Example 1, to obtain the green body;

[0039] Step 5. High-temperature sintering of the green blank: same as in Example 1, the final sintered body can be a dense chromium oxide refractory.

[0040] After testing, the solid content obtained in step 2 is 48vol%, and t...

Embodiment 3

[0042] The method for preparing dense chromium oxide refractory by gel injection molding, the steps are as follows:

[0043] Step 1. Prepare the premixed solution: Dissolve 8.4g acrylamide (AM) and 0.56g (15:1) crosslinking agent N,N'-methylenebisacrylamide (MBAM) in 38ml deionized water to prepare a solution A. Add 1.7ml AN-2000 dispersant to solution A to form solution B. After stirring well, adjust the pH value of solution B to 9 with concentrated ammonia water to obtain a premixed solution;

[0044] Step 2: Prepare ceramic slurry: same as Example 1, obtain ceramic slurry with a solid content of 50 vol%;

[0045] Step 3: Injection molding: same as Example 1, to obtain a green body;

[0046] Step 4: Drying and degreasing the green body: same as in Example 1, to obtain the green body;

[0047] Step 5. High-temperature sintering of the green blank: same as in Example 1, the final sintered body can be a dense chromium oxide refractory.

[0048] After testing, the solid phase content obta...

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Abstract

The invention discloses a preparation method of a dense chromium oxide refractory material by utilizing gel-casting. The material is a sintering body obtained through drying and degreasing green bodies and sintering biscuit at a high temperature after casting forming of ceramic slurry composed of a premixing liquor, chromium hemitrioxide powder and titanium dioxide powder. The preparation method comprises the steps of preparing the premixing liquor, preparing the ceramic slurry, carrying out casting forming, drying and degreasing the green bodies and sintering the biscuit at the high temperature, and finally the sintering body is the dense chromium oxide refractory material. The premixing liquor is composed of organic monomer acrylamide, a cross-linking agent, N,N'-methylene bisacrylamide and deionized water, expensive isostatic pressing equipment is not needed in the whole technological process of the preparation method, and a large amount of dust harmful to the environment cannot be generated. Under optimized pH value and dispersant content, a sizing agent with high solid content is obtained, and the sizing agent is prepared into the dense chromium oxide refractory material with good performance through the technologies of curing, drying, dumping, sintering and the like.

Description

Technical field [0001] The invention relates to the field of refractory molding, in particular to a gel injection molding process for preparing dense chromium oxide refractories. Background technique [0002] Gelcasting is a new ceramic molding technology-gel injection molding technology invented by JANNEY and Omatete of the Oak Ridge National Laboratory (ORNL) in the United States in the early 1990s. This technology cleverly combines traditional ceramic technology with polymer chemistry, and is a new type of near-net-size molding technology for preparing high-quality ceramic parts with complex shapes. [0003] Compared with other molding technologies, gel injection molding technology has a series of advantages: 1) It has a wide range of applications and has no special requirements for powder; 2) It can achieve near-net size molding and prepare parts with complex shapes; 3) The green body has high strength, which is significantly better than the green body made by the traditional ...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/12C04B35/634
CPCC04B35/12C04B35/634C04B35/66C04B2235/656C04B2235/6567
Inventor 杨德安丁春辉
Owner TIANJIN UNIV