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Method for preparing gelatin mold made from functional gradient material in static magnetic field

A technology of functionally graded materials and gel injection molding, which is used in manufacturing tools, ceramic molding machines, etc., can solve the problems of sudden changes in composition, complexity, and difficulty in obtaining large-thickness materials, and achieves the effect of simplifying procedures and reducing costs.

Inactive Publication Date: 2003-10-01
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, these preparation methods have important limitations
For example, powder molding is difficult to achieve continuous and uniform change of material components; vapor deposition is difficult to obtain large thickness materials; self-propagating combustion density is low; there are interfaces with sudden changes in composition between the plasma sprayed coatings; etc.
These methods require complex processes or equipment, and the lack of simple preparation methods is an important reason for limiting the further development of functionally graded materials.

Method used

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  • Method for preparing gelatin mold made from functional gradient material in static magnetic field
  • Method for preparing gelatin mold made from functional gradient material in static magnetic field
  • Method for preparing gelatin mold made from functional gradient material in static magnetic field

Examples

Experimental program
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Effect test

Embodiment 1

[0049] 1) After the gypsum mold obtained by solidifying and hardening the gypsum slurry is dried, the internal cavity of the mold is a disc with a height of 20 mm and a diameter of 35 mm.

[0050] 2) Nickel powder with an average particle size of 3 μm and Al with an average particle size of 0.9 μm 2 o 3 The powder is composed of a mixed powder in a ratio of 1:3, and the organic monomer acrylamide (AM) is mixed with the crosslinking agent methylenebisacrylamide (MBAM), and the mass ratio is added according to AM:MBAM=12:1, wherein the organic matter content is 15%, and adding a dispersant with a content of 0.1% of the mass fraction of the slurry is a composite copolymer of JA-281 polyacrylic acid composite macromolecular ammonium salt and A-6114 methacrylic acid and ammonium methacrylate, and the mass ratio is 1: 1 composition of the mixed solution. Then the mixed powder is dispersed in the mixed solution, the volume fraction of solid content after mixing is 60%, and then the...

Embodiment 2

[0055] 1) After the gypsum mold obtained by solidifying and hardening the gypsum slurry is dried, the internal cavity of the mold is a disc with a height of 20 mm and a diameter of 35 mm.

[0056] 2) Select cobalt powder with strong magnetic properties with an average particle size of 4 μm and ZrO powder with an average particle size of 2.2 μm 2 The powders are mixed powders in a ratio of 1:5. Mix the organic monomer acrylamide (AM) with the crosslinking agent methylenebisacrylamide (MBAM), add the mass ratio according to AM:MBAM=15:1, wherein the organic content is 20%, and the added content is the mass of the slurry The dispersant with a fraction of 0.3% is a mixed solution composed of JA-281 polyacrylic acid composite polymer ammonium salt and A-6114 methacrylic acid and ammonium methacrylate composite copolymer with a mass ratio of 1:1. Then the mixed powder is dispersed in the mixed solution, the volume fraction of the solid content after mixing is 65%, and then the pH v...

Embodiment 3

[0061] 1) After the gypsum mold obtained by solidifying and hardening the gypsum slurry is dried, the inner cavity of the mold is a disc with a height of 2 mm and a diameter of 20 mm.

[0062] 2) Nickel powder with an average particle size of 8 μm and Al with an average particle size of 3 μm 2 o 3 The powder is composed of mixed powder in a ratio of 1:3, mixed with non-aqueous solvent high-boiling gasoline, and added with trimethylpropane triacrylate (TMPTA) for organic monomer (adhesive). The slurry was stirred for 5 h in a ball mill and dispersed by ultrasonic waves. Add initiator ammonium persulfate then, comprise 20% (mass fraction) organic monomer in this slurry, 1% (volume fraction) initiator, 69% (volume fraction) solvent, the humidity of slurry is 35%, and temperature is At 33°C, the viscosity is 55mPa·s.

[0063] 3) Stir the slurry evenly and fill it into a plaster mold. A static magnetic field is applied outside the mold. The magnet that generates the static magne...

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Abstract

A process for preparing a function gradient material by gel moulding in static magnetic field includes such steps as preparing mould, proportionally mixing ceramic powder, strong-magnetic metal powder and water or solvent, ball grinding, pouring in mould in the static magnetic field (0.1-5.0 T), solidifying, baking and sintering. Its advantages are high performance and low cost.

Description

technical field [0001] The invention relates to a preparation method for gel injection molding of a functional gradient material in a static magnetic field. Background technique [0002] Ceramic materials have been widely used in electronics, machinery, national defense and other industrial fields due to their unique properties. However, ceramic materials are difficult to machine after sintering, so people have been looking for a net-size molding method for complex-shaped ceramic components, which has become a key link in ensuring the quality of ceramic components and making the developed materials obtain practical applications. The molding methods of ceramic materials can generally be divided into two categories: dry method and wet method. In comparison, the wet forming process has the advantages of simple equipment, uniform components of the formed body, less defects, and easy forming of complex-shaped parts, etc., and has strong practicability, bu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B28B1/26C04B35/622C04B35/624C04B35/626
Inventor 严密于濂清杨德仁
Owner ZHEJIANG UNIV
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