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Tape casting preparation for gradient material in rotating magnetic field

A rotating magnetic field and tape casting technology, applied in the field of material preparation, can solve the problems of restricting the development of functionally graded materials, changing the composition of raw materials or process parameters, and lack of preparation methods, and achieves the effects of strong binding force, simplified process and reduced cost.

Inactive Publication Date: 2009-08-12
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These preparation methods require complex processes or equipment, and most of them need to continuously change the raw material composition or process parameters during the preparation process
The lack of convenient preparation methods is an important reason for limiting the further development of functionally graded materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) BaO·6Fe with an average particle size of 0.1 μm 2 o 3 Powder and Al with an average particle size of 0.1 μm 2 o 3 The powder is composed of a mixed powder at a mass ratio of 1:10, and a mixed solvent is added. The mixed solvent is trichlorethylene and ethanol mixed at a ratio of 1:10, and a dispersant triolein is added. The above raw materials are mixed and ball milled for 5 hours, and then added into Agent polyvinyl butyral, plasticizer glycerin and dioctyl phthalate. The volume fraction of organic solvent is 20% of the slurry, the volume fraction of dispersant is 0.2% of the slurry, the binder is 10% of the slurry, and the weight ratio of binder to plasticizer is 0.5:1. Then ball mill for 10 hours, ultrasonically disperse for 1 minute, and vacuum degas to remove air bubbles to make a uniformly dispersed slurry.

[0028] 2) The casting speed used during casting is 5.0cm / s, the height of the scraper is controlled at 0.4mm, and a high-temperature-resistant ceramic...

Embodiment 2

[0032] 1) SmCo with an average particle size of 0.5 μm 5 Powder and ZrO with an average particle size of 0.5 μm 2 and Y 2 o 3 The mixed powder is composed of a mixed powder with a mass ratio of 3:10, and a mixed solvent is added. The mixed solvent is methyl ethyl ketone and ethanol, mixed according to 2:10, and the dispersant triethanolamine is added, the above raw materials are mixed and ball milled for 8 hours, and then the binder polyvinyl butyral, the plasticizer polyethylene glycol (PEC) and o-phthalic acid are added. dicarboxylic acid (PHT). The volume fraction of organic solvent is 30% of the slurry, the volume fraction of dispersant is 0.4% of the slurry, the binder is 15% of the slurry, and the weight ratio of binder to plasticizer is 0.7:1. Then ball mill for 18 hours, disperse with ultrasonic waves for 3 minutes, and degas in vacuum to make uniformly dispersed slurry after removing air bubbles.

[0033] 2) The casting speed used during casting is 1.0 cm / s, and ...

Embodiment 3

[0037] 1) Select Fe powder with an average particle size of 4 μm and AlN and Si with an average particle size of 2 μm 3 N 4 The mixed powder is composed of the mixed powder according to the mass ratio of 1:1, and the mixed solvent is added. The mixed solvent is trichlorethylene and methyl ethyl ketone mixed at a ratio of 1:1, and herring oil is added as a dispersant. The above raw materials were mixed and ball-milled for 15 hours, and then the binder polyvinyl alcohol and the plasticizer glycerin were added. The volume fraction of organic solvent is 60% of the slurry, the volume fraction of dispersant is 5% of the slurry, the binder is 30% of the slurry, the weight ratio of binder to plasticizer is 1.0:1, and the ball milling is 30h. Disperse with ultrasound for 15 minutes. After vacuum degassing and air bubble removal, a uniformly dispersed slurry is made.

[0038] 2) The casting speed used during casting is 0.5cm / s, the height of the scraper is controlled at 0.8mm, and a...

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PUM

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Abstract

The invention relates to a preparation method for tape casting of a gradient material in a revolving magnetic field. The existing method has complicated process and high requirement on equipment. The method comprises the following steps: mixing ferromagnetic particles and non-magnetic particles into mixed powder; adding an organic solvent, a dispersing agent, a plasticizing agent and a cementing agent into the mixed powder; adding the plasticizing agent and the cementing agent into the mixed powder after ball milling; and obtaining dispersed slurry through ball milling, ultrasonic dispersion treatment and vacuum degassing; pouring the dispersed slurry into a casting machine to apply revolving magnetic field on the substrate which is made of high temperature resistant ceramic; and carrying out dry combustion to obtain a finished product. The method can prepare thin and flat gradient material with large area in a large ingredient range, and the mature tape casting process is used to ensure that the process for producing the gradient functional material is simplified and cost is reduced.

Description

technical field [0001] The invention relates to a tape-casting preparation method of a gradient material in a rotating magnetic field, and belongs to the field of material preparation. Background technique [0002] Tape casting method (also known as scraper molding method) is an important molding method for preparing large-area, thin flat ceramic materials. The process includes slurry preparation, ball milling, molding, drying, and peeling off the base tape. The process is characterized by simple equipment, stable process, continuous operation, high production efficiency and high automation. Tape casting can control the thickness of the film conveniently, which is conducive to the design and structural regulation of film materials with different components and thicknesses to obtain special properties. In recent decades, the application research of tape casting technology has made great progress, and it has been applied in many fields such as electronics industry and energy,...

Claims

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Application Information

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IPC IPC(8): C04B35/622C04B35/26B22F3/10
Inventor 彭晓领葛洪良张朋越洪波
Owner CHINA JILIANG UNIV
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