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Water-based tape-casting slurry of boron carbide as well as preparation and application thereof

A technology of water-based casting and casting slurry, which is applied in the field of casting molding technology, can solve the problems of sensitive stability, poor chemical compatibility, and influence of casting film, and achieves conditions that are easy to control, smooth surface, and low cost 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

[0005] However, water-based tape casting is sensitive to the stability during slurry preparation, and slight changes in slurry composition, pH value, and drying conditions can have a great impact on the obtained cast film
Normally, B 4 The surface of C powder particles is covered with a layer of B 2 o 3 layer, which has poor chemical compatibility with the traditional binders used in water-based tape casting such as PVA and acrylic emulsion, which can easily cause polymer crosslinking to form a gel-like substance, so PVA and acrylic emulsion cannot be used as B 4 C tape casting binder
At present, there is no research on B at home and abroad 4 C Water-based Tape Casting Method Report

Method used

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  • Water-based tape-casting slurry of boron carbide as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1: 42.6g of B with an average particle size of 0.1-1.0 μm 4 C powder was added to 15ml of water containing a dispersant (the dispersant was tetramethylammonium hydroxide), and ball milled for 24 hours. Add 8.52g of aqueous epoxy resin emulsion as binder, 3.55g of anionic aliphatic polyurethane emulsion as plasticizer, and ball mill for 6h. The obtained slurry is subjected to vacuum defoaming, then tape casted, and dried naturally at room temperature for 3-5 hours, and then peeled off from the base tape to obtain a cast film. The casting film is placed on a plane and bent in one direction around a glass rod. The casting film can be bent at least 10 times over 135°, which proves that the casting film has excellent flexibility (such as figure 1 shown). At the same time, the casting slurry prepared in this example has good wettability, can well wet the casting base tape, and the prepared ceramic film is easy to peel off from the base tape; and the amount of binder...

Embodiment 2

[0036] Example 2: 37.8g of B with an average particle size of 0.1-1.0 μm 4 C powder was added to 15ml of water containing a dispersant (the dispersant was tetraethylammonium hydroxide), and ball milled for 24 hours. Add 7.56g of aqueous epoxy resin emulsion as binder, 3.78g of anionic aliphatic polyurethane emulsion as plasticizer, and ball mill for 6 hours. The obtained slurry is subjected to vacuum defoaming, then tape casted, and dried naturally at room temperature for 3-5 hours, and then peeled off from the base tape to obtain a cast film. After testing, it is proved that the casting film has excellent flexibility.

Embodiment 3

[0037] Example 3: 42.6g of B with an average particle size of 0.1-1.0 μm 4 C powder was added to 15ml of water containing a dispersant (the dispersant was tetrapropylammonium hydroxide), and ball milled for 24 hours. Add 6.85g of aqueous epoxy resin emulsion as binder, 2.84g of anionic aliphatic polyurethane emulsion as plasticizer, and ball mill for 6 hours. The obtained slurry is subjected to vacuum defoaming, then tape casted, and dried naturally at room temperature for 3-5 hours, and then peeled off from the base tape to obtain a cast film. After testing, it is proved that the casting film has excellent flexibility.

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Abstract

The invention belongs to the field of tape-casting processes and particularly relates to water-based tape-casting slurry of boron carbide as well as preparation and application thereof. The preparation process of the water-based tape-casting slurry provided by the invention comprises the steps of: taking water as an only solvent in the tape-casting process, regulating PH (Potential of Hydrogen) value, adding proper amount of dispersing agents, adhesion agents and plasticizing agents, subjecting to ball-milling, preparing the slurry suitable for the tape-casting, subjecting to defoaming, the tape-casting and drying and obtaining a uniform and smooth tape-casting membrane. The process provided by the invention has the advantages of simpleness in operation, easiness in controlling conditions, low cost, no poison, no harm and the like; the chemical compatibility between the adhesion agents and the boron carbide as well as the plasticizing agents and the boron carbide is good and the additive amount of the adhesion agents and the plasticizing agents is very low, therefore, the organic matter content in the tape-casting membrane is not high so as to benefit to the debonding and the sintering of the tape-casting membrane; and the tape-casting slurry has good wettability to a tape-casting baseband, the drying speed of the tape-casting membrane after tape-casting is high and good strength and toughness are provided.

Description

technical field [0001] The invention belongs to the field of tape casting technology, and in particular relates to a water-based tape casting slurry of boron carbide and its preparation and application. Background technique [0002] Boron carbide (B 4 C) has a low density (2.52g / cm 3 ), high hardness (second only to diamond and cubic boron nitride), high melting point (2450°C) and good chemical stability and a series of excellent physical and chemical properties. , high temperature thermoelectric conversion and ideal material for polishing abrasives. but B 4 C ceramics also have disadvantages such as low reliability, high sintering temperature, high energy consumption and high cost in the preparation process, which limit the B 4 C ceramic applications. [0003] In recent years, wet forming has become an important forming method for the preparation of high-performance ceramics. By effectively controlling the "structure" of the initial slurry and its evolution during the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/563C04B35/634
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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