Gel injection moulding preparation for gradient material in rotating magnetic field

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...

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.