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Solid-phase reacting synthesis of composite ceramic powder non-toxic gel

A composite ceramic and synthesis method technology, which is applied to the improvement field of solid-phase reaction synthesis technology of multi-component ceramic composite powder, can solve the problems of corrosive gas, cumbersome filtering operation, component segregation, etc., and achieves low cost and powder. The effect of high quality and low price

Active Publication Date: 2007-06-13
BEIJING AVIATION MATERIAL INST NO 1 GRP CORP CHINA AVIATION IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is: to propose a new method for the synthesis of multi-component ceramic composite powder - non-toxic gel solid phase reaction synthesis method, which can not only overcome the composition caused by the uneven dispersion of multi-component existing in the traditional solid-phase method The segregation problem and the disadvantages of cumbersome washing and filtration operations, high cost and generation of corrosive gas in the conventional liquid phase method overcome the toxicity problem of the traditional polymer gel method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0015] The present invention will be described in further detail below. The composite ceramic powder non-toxic gel solid-phase reaction synthesis method of the present invention is characterized in that the operation steps of the method are as follows:

[0016] (1) Ingredients, preparation of ceramic raw materials. The raw materials are basically the same as the traditional solid-phase reaction synthesis method, and the micro-additive elements are water-soluble salts, and the raw materials to be synthesized are mixed according to the specified ratio.

[0017] (2) Prepare an aqueous solution of sodium alginate with a concentration of 1 to 3 wt%.

[0018] (3) Mixing, mixing the sodium alginate aqueous solution with the ceramic raw material and the dispersant. The dispersant is any one of the following substances or a mixture of several substances: polyacrylic acid, polymethacrylic acid ammonia, acrylic acid-acrylate Binary copolymer, ammonium citrate and tetramethylammonium hydroxid...

Embodiment 1

[0027] Example 1: Synthesis of magnesium metatitanate MgTiO 3 Powder.

[0028] Raw material uses metatitanate H 2 TiO 3 And basic magnesium carbonate Mg(OH) 2 ·4MgCO 3 ·6H 2 O, its ratio is Mg:Ti=1:1. Add 3 grams of sodium alginate to 200 milliliters of water and stir to dissolve to prepare an aqueous solution of sodium alginate, then add 1000 grams of the above ceramic materials, and add 8 milliliters of polyacrylic acid dispersant. Mix by ball milling for 5 hours to obtain a ceramic slurry with a solid content of about 50vol%. Pour the slurry into a container. Under stirring, add 10 grams of calcium iodate and mix well, then place the container with the slurry After 30 minutes in a constant temperature container at 60°C, the slurry in the container gels. Take out the wet gel block and place it in an oven at 80°C to dry to constant weight, then put it in a muffle furnace and heat up to 600°C with the furnace ,Hold for 30 minutes, burn out the organic matter, then increase to 900℃...

Embodiment 2

[0029] Example 2: Synthesis of W-type ferrite BaZn 0.5 Co 1..5 Fe 16 O 27 Powder.

[0030] Non-water-soluble Fe is used as raw material 2 O 3 , BaCO 3 And water-soluble ZnCl 2 , CoCl2 The ratio is Ba:Zn:Co:Fe=1:0.5:1.5:7.8. Add 3 g of sodium alginate to 250 ml of water and stir to dissolve it to prepare an aqueous solution of sodium alginate, then add 1000 g of the above ceramic material and 8 g of ammonium citrate dispersant. Mix by ball milling for 10 hours to obtain a well-dispersed ceramic slurry. Pour the slurry into a container. Under stirring, add 4 grams of dibasic calcium phosphate and mix evenly. Then heat the container with the slurry in a microwave oven. After 1 minute, the slurry gelatinized, take out the wet gel block and break it into about 2cm 2 The small pieces are dried to constant weight under ventilated conditions, and then put in a muffle furnace and heated up to 700°C with the furnace, kept for 1 hour to burn off organic matter, and then raised to 1200°C for ...

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Abstract

A non-toxic gel solid phase reacting synthesis of composite ceramic powder is carried out by proportioning, preparing sodium alginate solution, mixing, ball milling, adding catalyst, gelating, drying and calcining. Its advantages include low cost, simple operation, no pollution and higher powder quality.

Description

Technical field [0001] The invention belongs to the field of inorganic non-metallic materials and relates to the improvement of the solid-phase reaction synthesis technology of multi-component ceramic composite powder. Background technique [0002] The characteristics of ceramic powder have an important impact on the preparation process and microstructure of special ceramic materials, and then have a greater impact on the performance of ceramic components. Therefore, research on the preparation of high-performance ceramic powder with advanced technology has always been an important aspect of the development of ceramic materials. At present, traditional ceramic powder preparation methods include solid phase method, liquid phase method, gas phase method, mechanical method and solvent evaporation method. The preparation of ceramic powder by these traditional methods usually has uneven powder composition, high synthesis temperature, The process is complicated, the equipment requireme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/622C04B35/624C04B35/63C04B35/632C04B35/634C04B35/64
Inventor 仝建峰陈大明华文君刘晓光李宝伟
Owner BEIJING AVIATION MATERIAL INST NO 1 GRP CORP CHINA AVIATION IND