Method for preparing functionally graded material through pressure filtration forming in motional magnetic field

A technology of moving magnetic field and filter press molding, which is applied to ceramic molding machines, manufacturing tools, etc., to achieve the effects of process simplification and cost reduction

Inactive Publication Date: 2012-09-19
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, these more traditional and mature production processes cannot be directly used to prepare functionally graded materials with continuously changing component structures and physical parameters.

Method used

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  • Method for preparing functionally graded material through pressure filtration forming in motional magnetic field
  • Method for preparing functionally graded material through pressure filtration forming in motional magnetic field

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preparation example Construction

[0031] The preparation method of pressure filtration molding of gradient material in moving magnetic field, its steps are as follows:

[0032] 1) Plaster mold preparation

[0033] α-gypsum and β-gypsum are mixed with water at 15-25°C, stirred for 3-8 minutes and then poured. 30% saved in the environment. Since the filter press is shaped by filtering out part of the liquid medium through a porous mold, the porous mold is extremely important. The filter press mold must not only meet the requirements of the filter press process for porous filter materials, but also meet the requirements for the mold structure. On the one hand, porous materials for press filtration must have ideal filtration performance, that is, have sufficiently small pores, narrow pore size distribution, moderate porosity and permeability coefficient; on the other hand, in order to ensure the size and shape of the molded body, these Porous materials must have sufficient rigidity and strength, and easy contro...

Embodiment 1

[0044] 1) Mix α-gypsum and β-gypsum with pure tap water at 20°C, add phenolic resin, the content of which is 10% of the mass of the gypsum, pour after stirring for 4 minutes, and solidify and harden the gypsum slurry. After drying, the inner cavity of the mold is a cuboid of 30mm×10mm×5mm;

[0045] 2) Select SmCo with strong magnetic properties with an average particle size of 4 μm 5 Powder and ZrO with an average particle size of 2.2 μm 2 The powder is composed of a mixed powder in a ratio of 1:10, and the mixed powder is continuously added to deionized solvent water, and hydrochloric acid is added to adjust the pH value to 5, until the solid phase content reaches 45vol%, stirred in a ball mill for 4 hours, and ultrasonically Dispersion treatment. The humidity of the pouring slurry obtained is 35%, the temperature is 40°C, and the viscosity is 68mPa·s;

[0046] 3) The mold temperature during grouting is 28°C. Fill the slurry into the plaster mold, wipe the mold with 3% sod...

Embodiment 2

[0050] 1) Mix α-gypsum and β-gypsum with pure tap water, add polyvinyl fluoride, the content of which is 10% of the mass of the gypsum, stir for 4 minutes and pour. After the plaster mold made by solidifying and hardening the gypsum slurry is dried, the inner cavity of the mold is a cuboid of 30mm×10mm×5mm;

[0051] 2) Select 50 μm aluminum powder and Al with an average particle size of 2.2 μm 2 o 3 The powder is composed of a mixed powder in a ratio of 1:1, and the mixed powder is continuously added to deionized solvent water, and hydrochloric acid is added to adjust the pH value to 3.8, until the solid phase content reaches 45vol%, stirred in a ball mill for 6 hours, and dispersed by ultrasonic waves processing. The humidity of the obtained pouring slurry is 40%, the temperature is 35°C, and the viscosity is 30mPa·s;

[0052] 3) The mold temperature is 27°C during grouting, the mold is wiped with 3% soda solution, the slurry is filled into the plaster mold, and a moving m...

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Abstract

The invention discloses a method for preparing a functionally graded material through pressure filtration forming in a motional magnetic field, which comprises the following steps of: 1) preparing a porous mould; 2) mixing powders different in magnetism with de-ionized water in a certain proportion, and stirring all the materials in a ball mill to form evenly dispersed slurry, and carrying out pouring; 3) applying a motional magnetic field having the magnetic field intensity of 0.1 to 10 T to take effect once or multiple times, and performing pressure filtration filtering; and 4) carrying out drying and sintering forming. The method disclosed by the invention has the following advantages that: graded materials different in composition distribution can be obtained by changing the magnetic field intensity, the speed of motion and the magnetic field acting times; and by employing the mature ceramic pressure filtration forming method, the steps for preparing the functionally graded material are simplified, and the cost is greatly reduced.

Description

technical field [0001] The invention relates to a method for preparing a gradient material moving in a magnetic field by pressure filtration and belongs to the field of material preparation. Background technique [0002] Ceramic products prepared from powder raw materials usually include several steps of powder preparation, powder processing, powder molding, and sintering densification. Each step has the potential to introduce defects. Some of the defects introduced in the steps before sintering will be eliminated in the next process, while some will remain until the end or turn into new defects as the process progresses. Defects that ultimately lead to material failure mostly originate in the green body, ie are formed during the forming process. These defect origins include: soft agglomerates, hard agglomerates, organic inclusions, inorganic inclusions and large grains. Most of these main types of defects can be eliminated or reduced by filter press molding. [0003] Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B28B1/26
Inventor 严密彭晓领张煜武敏
Owner ZHEJIANG UNIV
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