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

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

Active Publication Date: 2005-10-12
BEIJING AVIATION MATERIAL INST NO 1 GRP CORP CHINA AVIATION IND
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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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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, ceramic raw materials are prepared according to the predetermined formula of the composite ceramic powder to be prepared. Use the raw materials basically the same as the traditional solid-state reaction synthesis method, in which water-soluble salts are used as trace elements, and the raw materials to be synthesized into powders are compounded according to the specified ratio.

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

[0018] (3) Mixing, mixing sodium alginate aqueous solution with ceramic raw materials and a dispersant, the dispersant is any one of the following substances or a mixture of several substances: polyacrylic acid, polymethacrylic acid ammonia...

Embodiment 1

[0027] Embodiment 1: synthetic magnesium metatitanate MgTiO 3 Powder.

[0028] The raw material is metatitanic acid H 2 TiO 3 and basic magnesium carbonate Mg(OH) 2 4MgCO 3 ·6H 2 O, the ratio of which is Mg:Ti=1:1. Add 3 grams of sodium alginate to 200 milliliters of water and stir to dissolve to obtain an aqueous solution of sodium alginate, then add 1000 grams of the above-mentioned ceramic raw 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 containing the slurry on the In a constant temperature container at 60°C, after 30 minutes, the slurry in the container is gelled, 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 , keep it warm ...

Embodiment 2

[0029] Embodiment 2: Synthesis of W-type ferrite BaZn 0.5 co 1..5 Fe 16 o 27 Powder.

[0030] The raw material is water-insoluble Fe 2 o 3、BaCO 3 and water-soluble ZnCl 2 、CoCl 2 , and its proportioning ratio is Ba: Zn: Co: Fe=1: 0.5: 1.5: 7.8. Add 3 grams of sodium alginate to 250 milliliters of water and stir to dissolve to obtain an aqueous solution of sodium alginate, then add 1000 grams of the above-mentioned ceramic raw materials, and add 8 grams of ammonium citrate dispersant. Mix by ball milling for 10 hours to obtain a well-dispersed ceramic slurry, pour the slurry into a container, add 4 grams of calcium hydrogen phosphate and mix evenly under stirring, then place the container containing the slurry in a microwave oven to heat, After 1 minute, the slurry gelled, took out the wet gel block, and broke it into about 2cm 2 The small pieces are dried under ventilated conditions to constant weight, then placed in a muffle furnace and heated to 700°C with the furn...

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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 multi-component ceramic composite powder solid phase reaction synthesis technology. Background technique [0002] The characteristics of ceramic powder have an important impact on the preparation process and microstructure of special ceramic materials, which in turn have a greater impact on the performance of ceramic components. Therefore, it has always been an important aspect of the development of ceramic materials to study the preparation of high-performance ceramic powders by advanced technology. 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 requi...

Claims

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Application Information

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Patent Type & Authority Applications(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
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