A kind of method for water-based tape casting to prepare zrb2/sic composite ceramic diaphragm

A technology of water-based tape casting and composite ceramic membrane, which is applied in the direction of ceramic molding machines and manufacturing tools, can solve the problems of complex determination of casting slurry composition and parameters, and is beneficial to debonding and sintering, and process operation Simple, good wetting effect

Inactive Publication Date: 2013-03-13
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

Due to the chemical reaction between borides and the traditional water-based tape casting binder polyvinyl alcohol (PVA), polyvinyl alcohol (PVA) cannot be used for water-based tape casting of ultra-high temperature ceramics, and due to the addition of SiC Makes the determination of the composition and parameters of the casting slurry more complicated
At present, there is no report on the preparation of ZrB2 / SiC composite ceramics by water-based casting

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1: 71.3g ZrB 2 Add the powder into 15ml of water containing a dispersant, and after ball milling for 12 hours, add 2.0g of SiC powder, and after ball milling for 12 hours, add a binder water-soluble polyacrylate emulsion (the solid content of the colloidal particles is 50wt%, and the pH is 7-9 , glass transition temperature T g -22°C) 8.8g, film-forming aid Texanol 0.04g, ball milled for 5h. The obtained slurry is vacuum defoamed and then tape-cast, and then dried naturally at room temperature for 3-5 hours to be peeled off from the base tape to obtain ZrB 2 / SiC composite casting film, the film thickness is 0.05-0.4mm.

Embodiment 2

[0014] Embodiment 2: with 67.6g ZrB 2 Add the powder into 15ml of water containing a dispersant, and after ball milling for 12 hours, add 3.9g of SiC powder, and after ball milling for 12 hours, add the binder water-soluble polyacrylate emulsion (the solid content of the colloidal particles is 50wt%, and the pH is 7-9 , glass transition temperature T g -22°C) 8.6g, film-forming aid Texanol 0.04g, ball milled for 5h. The obtained slurry is vacuum defoamed and then tape-cast, and then dried naturally at room temperature for 3-5 hours to be peeled off from the base tape to obtain ZrB 2 / SiC composite cast film.

Embodiment 3

[0015] Embodiment 3: with 60.0g ZrB 2 Add the powder into 15ml of water containing a dispersant, and after ball milling for 12 hours, add 7.9g of SiC powder, and after ball milling for 12 hours, add the binder water-soluble polyacrylate emulsion (the solid content of the colloidal particles is 50wt%, and the pH is 7-9 , glass transition temperature T g -22°C) 8.1g, film-forming aid Texanol 0.04g, ball milled for 12h. The obtained slurry is vacuum defoamed and then tape-cast, and then dried naturally at room temperature for 3-5 hours to be peeled off from the base tape to obtain ZrB 2 / SiC composite cast film.

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Abstract

The invention relates to a method for preparing a zirconium diboride / silicon carbide composite ceramic diaphragm by water-based tape casting, which is characterized in that water is used as the only solvent in the tape casting process, and diboron is sequentially added to an aqueous solution containing a dispersant Zirconium carbide and silicon carbide powder are mixed by ball milling to obtain a co-dispersed slurry of zirconium diboride and silicon carbide. Polyacrylate emulsion is used as a binder and an appropriate amount of film-forming aid is added. After ball milling, a slurry suitable for casting is prepared. The formed slurry is defoamed, casted and dried to obtain a uniform and smooth ZrB2 / SiC composite cast film. It has the advantages of simple operation, easy control of conditions, low cost, non-toxic and harmless, etc., and the amount of binder required for film formation is small, and has a low glass transition temperature (Tg), no need to add plasticizers, flow The content of organic matter in the cast film is not high, which is beneficial to the debonding and sintering of the cast film. In addition, the casting slurry has good wettability to the Mylar film tape, and the casting film dries quickly after casting, and has good strength and toughness.

Description

technical field [0001] This patent relates to a water-based tape-casting preparation of ZrB 2 The invention discloses a method for composite ceramic diaphragms of SiC / SiC (zirconium diboride / silicon carbide), which belongs to the field of tape casting technology. Background technique [0002] Ultra-high temperature ceramics include borides, carbides and nitrides with high melting points. Due to its high melting point, good chemical stability and oxidation resistance, it can be used as a thermal protection system material in extreme environments such as hypersonic flight, atmospheric reentry, and key components such as wing leading edge and nose cone. In the family of ultra-high temperature ceramics, due to the lowest density of zirconium diboride (6.09g / cm 3 ), and has good electrical and thermal conductivity, making it widely concerned. while in ZrB 2 The introduction of SiC can greatly improve the strength, reliability and oxidation resistance of the material, so ZrB ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B28B1/30C04B35/565C04B35/58C04B35/622
Inventor 吕志翚江东亮张景贤林庆玲黄政仁
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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