Extrusion molding preparation method of gradient material in static magnetic field

Abstract

The invention discloses an extrusion molding preparation method of a gradient material in a static magnetic field. The method comprises the following steps: 1, adding an organic solvent, a dispersant and a binder into mixed power of strongly magnetic metal and weakly magnetic ceramics, and carrying out uniform mixing to obtain a mud material; 2, performing extrusion molding on the mud material in an extruder and accordingly obtaining a green compact, wherein the extrusion pressure is 0.2 to 0.8 MPa, a static magnetic field is applied to an extrusion port, and the magnetic field intensity is 0.01 to 2T; and 3, after dying is performed at a temperature of 20 to 80 DEG C, carrying out sintering, performing heat insulation for 4h, and then cooling in a furnace, wherein the sintering is carried out in an argon or nitrogen protection environment and the sintering temperature is 1200 to 1500 DEG C. The method provided by the invention has the following advantages: the gradient material with continuously changing components can be prepared; and by use of a mature extrusion forming technology, the procedures for producing the gradient material is simplified, the cost is decreased, and the performance is improved.

Description

technical field [0001] The invention relates to an extrusion molding preparation method of a gradient material in a static magnetic field, belonging to the field of material preparation. Background technique [0002] Extrusion molding refers to a processing method in which the material passes through the action between the extruder barrel and the screw, is heated and plasticized, pushed forward by the screw, and continuously passes through the machine head to make various cross-section products or semi-finished products. Traditional extrusion molding is used in the processing of thermoplastics and rubber. It can be used for batching, granulation, rubber filtration, etc., and can be used for continuous production to manufacture various continuous products such as pipes, profiles, plates (or sheets), films, Wire and cable coating, rubber tire tread strips, inner tube tubes, sealing strips, etc., have high production efficiency. With the development of technology, extrusion mo...

AI Technical Summary

Problems solved by technology

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.