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Aqueous tape casting method of superhigh-temperature ceramic

A technology of ultra-high temperature ceramics and water-based casting, which is applied in the direction of ceramic molding machines, chemical instruments and methods, manufacturing tools, etc., can solve the problems of unusable ultra-high temperature ceramics, etc., and achieve fast drying speed, good strength and flexibility, low cost effect

Inactive Publication Date: 2012-04-11
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

Polyvinyl alcohol (PVA) cannot be used for water-based tape casting of ultra-high temperature ceramics due to the chemical reaction between borides and the traditional water-based tape casting binder polyvinyl alcohol (PVA)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: 50g of ZrB with an average particle size of 0.35μm 2 Add the powder to 10ml of water containing dispersant and ball mill for 24h. The added binder is water-soluble styrene-acrylic emulsion (solid content of colloidal particles is 50wt%, pH is 8-9, glass transition temperature T g It is -6°C) 28g, film forming aid Texanol 0.28g, ball milling for 12h. Then add 11.2g ZrB 2 Powder, ball mill for 24h. The obtained slurry is vacuum degassed and then cast into a molding process, and it can be peeled from the base tape to obtain a cast film by natural drying at room temperature for 3-5 hours.

Embodiment 2

[0015] Example 2: Using 50 g of ZrB with an average particle diameter of 0.35 μm 2 Add the powder to 10ml of water containing dispersant and ball mill for 24h. Add binder water-soluble styrene-acrylic emulsion (solid content of colloidal particles is 50wt%, pH is 8-9, glass transition temperature T g -6℃) 30g, film-forming aid Texanol 0.30g, ball milling for 12h. Add 25g ZrB 2 Powder, ball mill for 24h. The obtained slurry is vacuum degassed and then cast into a molding process, and it can be peeled from the base tape to obtain a cast film by natural drying at room temperature for 3-5 hours.

Embodiment 3

[0016] Example 3: 50g TiB with an average particle size of 0.35μm 2 Add the powder to 10ml of water containing dispersant and ball mill for 24h. The added binder is water-soluble styrene-acrylic emulsion (solid content of colloidal particles is 50wt%, pH is 8-9, glass transition temperature T g -6°C) 30.6g, film-forming aid Texanol 0.31g, ball milling for 12h. Then add 35g ZrB 2 Powder, ball mill for 24h. TiB obtained 2 -ZrB 2 After the composite slurry is vacuum degassed, it is cast into shape, and it can be peeled off from the base tape to obtain a cast film by natural drying at room temperature for 3-5 hours.

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PUM

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Abstract

The invention relates to an aqueous tape casting method of superhigh-temperature ceramic, belonging to the field of casting molding processes. The aqueous tape casting method of the superhigh-temperature ceramic is characterized by comprising the following steps: adopting water as the unique solvent in the casting process, adding ceramic powder into the water to make uniform suspension sizing agent, using styrene-acrylate emulsion as a binder, adding proper amount of film formation assistant, carrying out ball milling, adding the ceramic powder again to prepare a sizing agent suitable for tape casting, defoaming, casting and drying to prepare a uniform and smooth casting film. The invention has the advantages of simple operation, easily controlled condition, low cost, non-toxicity, innocuity and the like, and the binder has lower glass-transition temperature (Tg) so that a plasticizer ductilimeter is not needed. In addition, the casting sizing agent has good wettability for a Mylar pellicular zone, and after casting, the casting film has high drying speed and good strength and toughness. The ceramic powder used in the two steps can be same or different, thereby a complex phase ceramic casting film is constructed.

Description

Technical field [0001] The invention relates to a water-based casting method for ultra-high-temperature ceramics, and belongs to the field of casting molding technology. Background technique [0002] Ultra-high temperature ceramics include high melting point borides, carbides and nitrides. 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 the leading edge of the wing and the nose cone. At present, the main forming method of ultra-high temperature ceramics is dry pressing. Dry pressing has the advantages of simple operation and low cost. However, dry pressing tends to cause uneven forming of the blank (especially large parts), which is not conducive to the final product performance. Compared with dry press molding, colloidal molding can obtain a more uniform green structure by finely controlling th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B28B1/30B28C1/04B28C1/06B28B11/24C04B35/622
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