Method for preparing functional gradient material by adopting doctor-blade casting process

A technology of functionally graded materials and tape casting, which is applied in the field of preparing functionally graded materials, can solve problems such as changing raw material components or process parameters, lack of preparation methods, and limiting the development of functionally graded materials, and achieves the effects of simplifying procedures and reducing costs

Inactive Publication Date: 2003-12-10
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 parameter...

Method used

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  • Method for preparing functional gradient material by adopting doctor-blade casting process
  • Method for preparing functional gradient material by adopting doctor-blade casting process
  • Method for preparing functional gradient material by adopting doctor-blade casting process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1) Nickel powder with an average particle size of 20 μm and Al with an average particle size of 9 μm 2 o 3 The powder is composed of mixed powder in a ratio of 1:2, and a mixed solvent is added. The mixed solvent is trichlorethylene and ethanol mixed at a ratio of 1:1, and the dispersant triolein is added. The above raw materials are mixed and ball milled for 30 hours, and then added into the bonding Agent PVB, plasticizer glycerin and dioctyl phthalate. The binder is 30% of the mass fraction of the slurry, and the binder / plasticizer weight ratio is 0.6. Then ball mill the slurry for 36 hours, disperse it by ultrasonic wave for 5 minutes, and degas it under vacuum to remove air bubbles to make a uniformly dispersed slurry. The solvent volume fraction in this slurry is 50% of the slurry, the dispersant is 3% of the slurry volume fraction, the slurry viscosity is 60mPa·s, the pH value is 5.7, and the temperature is 32°C.

[0032] 2) The ambient temperature during casti...

Embodiment 2

[0036] 1) Select Co powder with an average particle size of 14 μm and ZrO with an average particle size of 12.2 μm 2 The powder is mixed in a ratio of 1:2 to form a mixed powder, and a mixed solvent is added. The mixed solvent is methyl ethyl ketone and ethanol, mixed according to 1:1, and the dispersant triethanolamine is added, the above raw materials are mixed and ball milled for 30 hours, and then the binder PVB, the plasticizer polyethylene glycol (PEC) and phthalic acid (PHT) are added . The binder is 30% of the mass fraction of the slurry, and the binder / plasticizer weight ratio is 0.8. Then ball mill for 36 hours, disperse with ultrasonic waves for 3 minutes, and degas in vacuum to remove air bubbles to make a uniformly dispersed slurry. The solvent volume fraction in this slurry is 60% of the slurry, the dispersant is 2% of the slurry volume fraction, the slurry viscosity is 40mPa·s, the pH value is 6.2, and the temperature is 30°C.

[0037] 2) The ambient temperat...

Embodiment 3

[0041] 1) Select Co powder with an average particle size of 16 μm and TiC powder with an average particle size of 28 μm, form a mixed powder in a ratio of 1:1, and add a mixed solvent. The mixed solvent is trichlorethylene / ethanol, mixed according to 1:1, and the dispersant triethanolamine is added. The above raw materials were mixed and ball milled for 30 hours, and then the binder PVB and the plasticizer glycerin were added. The binder is 20% of the mass fraction of the slurry, the binder / plasticizer weight ratio is 0.8, and ball milled for 30 hours. Disperse with ultrasound for 5 min. After vacuum degassing and air bubble removal, a uniformly dispersed slurry is made. The solvent volume fraction in this slurry is 50% of the slurry, the dispersant is 2% of the slurry volume fraction, the slurry viscosity is 80mPa·s, the pH value is 7, and the temperature is 30°C.

[0042] 2) The ambient temperature during casting is 23°C, the casting speed used is 0.8cm / s, the height of t...

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Abstract

The method for preparing functional gradient material by adopting doctor-blade casting process includes the following steps: 1). mixing ceramic powder, strong-magnetic metal powder, organic solvent and additive according to a certain proportion, stirring them in ball-grinding machine to obtain uniform dispersed slurry material; 2) in the static magnetic field with magnetic field intensity of 0.1-5.0 Tesla making the slurry material into film by means of doctor-blade casting process; and (3) drying and sintering, and forming.

Description

technical field [0001] The invention relates to a method for preparing functionally graded materials by tape casting. 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, including various thicknesses of Al ...

Claims

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Application Information

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IPC IPC(8): C04B35/622C04B35/632C04B35/64
Inventor 于濂清严密文玉华罗伟
Owner ZHEJIANG UNIV
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