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Gel injection moulding preparation for gradient material in rotating magnetic field

A technology of rotating magnetic field and gradient materials, which is applied in clay preparation devices, chemical instruments and methods, manufacturing tools, etc., can solve problems such as low density, complexity, and sudden change in composition, and achieve simplified procedures, strong constraints, and reduced costs Effect

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

[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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) Slurry preparation

[0030] 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 in a ratio of 1:10; the organic monomer acrylamide (AM) and the crosslinking agent methylenebisacrylamide (MBAM) are dissolved in deionized water at a weight ratio of 6:1 to form the mass fraction of organic matter 10% premix; add the mixed powder to the premix, and at the same time add ammonium polyacrylate as a dispersant with a mass fraction of 0.05% of the slurry, mill in a ball mill for 1 hour, and perform ultrasonic dispersion treatment for 1 minute to obtain a dispersed slurry. The solid phase volume content in the material is 50%, and then the pH value is adjusted to 5.0 with 15% concentrated ammonia water and 15% concentrated hydrochloric acid.

[0031] 2) Injection molding in a rotating magnetic field

[0032] Add 1 wt.% persulfuric acid aqueous solution initiator and 0.5‰...

Embodiment 2

[0037] 1) Slurry preparation

[0038] SmCo with an average particle size of 0.9 μm 5 Powder and ZrO with an average particle size of 0.6 μm 2 and Y 2 o 3 The powder is mixed in a ratio of 1:4 to form a mixed powder; the organic monomer methacrylamide and the crosslinking agent methylenebisacrylamide (MBAM) are dissolved in deionized water at a weight ratio of 15:1, and the mass fraction of the organic matter is 20% premix; add the mixed powder to the premix, and at the same time add dispersant SD-38 with a content of 0.2% by mass of the slurry, mill in a ball mill for 6 hours, and ultrasonically disperse for 8 minutes to obtain a dispersed slurry. The volume content of solid phase in the material is 65%, and then the pH value is adjusted to 8.2 with 25% concentrated ammonia water and 30% concentrated hydrochloric acid.

[0039] 2) Injection molding in a rotating magnetic field

[0040] Add 3wt.% persulfuric acid aqueous solution initiator and tetramethylethylenediamine ca...

Embodiment 3

[0045] 1) Slurry preparation

[0046] Nickel powder with an average particle size of 8 μm and SiC and TiC powders with an average particle size of 3 μm were mixed in a ratio of 1:1; the organic monomer vinylpyrrolidone and the crosslinking agent methylenebisacrylamide (MBAM) were mixed according to Dissolve it in deionized water at a weight ratio of 24:1 to prepare a premixed solution with a mass fraction of organic matter of 25%; add the mixed powder to the premixed solution, and at the same time add dispersant JA-281 with a content of 0.5% by mass of the slurry, Ball milling in a ball mill for 10 hours, ultrasonic dispersion treatment for 15 minutes to obtain a dispersed slurry, the solid phase volume content in the slurry is 70%, and then the pH value is adjusted to 12 with 38% concentrated ammonia water and 40% concentrated hydrochloric acid.

[0047] 2) Injection molding in a rotating magnetic field

[0048] Add 5 wt.% persulfuric acid aqueous solution initiator and tetr...

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Abstract

The invention relates to a method for preparing a gel injection mold of a gradient material in a revolving magnetic field. The existing method is difficult to realize continuous and even variation of material compositions, or difficult to obtain large-thickness materials and the like. The method comprises the following steps: mixing ferromagnetic particles and non-magnetic particles into mixed powder; preparing organic monomer and a cross-linking agent into premixed solution; adding the mixed powder into the premixed solution; adding a dispersing agent into the solution; obtaining a dispersedslurry through ball milling and ultrasonic dispersion treatment; adding an initiator and a catalyst into the dispersed size; pouring the size into a mold after stirring; applying the revolving magnetic field outside the mold; and taking out the mold after gelling, drying, pressing and sintering. The method can prepare gradient materials with various thicknesses in a large ingredient range, has continuous variable and controllable ingredients, simplified process and reduced cost.

Description

technical field [0001] The invention relates to a preparation method for gel injection molding of gradient materials in a rotating magnetic field, and belongs to the field of material preparation. 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 contrast, the wet forming process has the advantages of simple equipment, uniform composition of the formed body, less defects, and easy forming of complex-shaped parts, etc., and has strong pra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/624B28C1/04B28B1/14
Inventor 彭晓领葛洪良张朋越洪波
Owner CHINA JILIANG UNIV
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