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Method for preparing high-solid-phase content and low-viscosity ceramic slurry by using non-spherical ceramic particles

A technology of ceramic particles and ceramic slurry, which is applied in the field of preparation of high solid phase content and low viscosity ceramic slurry, can solve the problems of shortage, large amount of engineering, lack of quantitative shape description methods for irregular ceramic particles, etc., to achieve Performance and cost reduction effects

Inactive Publication Date: 2019-08-02
XI AN JIAOTONG UNIV
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Problems solved by technology

Silva AP et al. determined the optimal grading ratio of each coarse and fine particle by means of a three-stage grading slurry viscosity matrix diagram. Although the fluidity of the slurry is good, the above-mentioned optimization process is entirely dependent on experiments, and the amount of engineering is large. a more general mechanism
At the same time, most of the above-mentioned slurry viscosity optimization processes are carried out for spherical particles. This is due to the lack of quantitative shape description methods for irregular ceramic particles, and it is difficult to establish an accurate particle accumulation model.

Method used

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  • Method for preparing high-solid-phase content and low-viscosity ceramic slurry by using non-spherical ceramic particles
  • Method for preparing high-solid-phase content and low-viscosity ceramic slurry by using non-spherical ceramic particles
  • Method for preparing high-solid-phase content and low-viscosity ceramic slurry by using non-spherical ceramic particles

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preparation example Construction

[0043] A method for preparing ceramic slurry for gel injection molding with high solid phase content and low viscosity by using non-spherical ceramic particles disclosed by the present invention comprises the following steps:

[0044] 1) Selection and morphology characterization of ceramic powder materials

[0045] The ceramic powder is made of ceramic powders of different thicknesses prepared by the same process method, and the particle morphology is roughly screened by scanning electron microscopy to determine whether the ceramic particles have similar geometric shapes; at least two or more particle sizes of ceramics are selected. For powder, the particle size ratio of adjacent particles is greater than 2, the selected minimum particle size should be greater than 1 μm, and the maximum particle size should be less than 150 μm. Use a laser particle size analyzer to analyze the particle size of the selected ceramic particles, measure the particle size distribution curve, median...

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Abstract

The invention discloses a method for preparing high-solid-content and low-viscosity ceramic slurry by using non-spherical ceramic particles. According to the idea of multi-level gradation of particles, based on the fractal theory, the closest packing formula applicable to irregular ceramic particles is deduced with reference to the most accepted Funk-Dinger equation in a continuous particle distribution model, so as to guide and design the ratio of fine ceramic powder to coarse ceramic powder in the powder formulation. The ceramic slurry designed and prepared by the method has the characteristics of high solid content and low viscosity, and can be used for colloidal molding of ceramic parts. The slurry prepared by the method can satisfy the molding of the micro-structured ceramic parts, and the molded parts have the advantages of high green body strength, small post-treatment shrinkage and the like.

Description

technical field [0001] The invention belongs to the field of ceramic colloidal molding, and relates to a method for preparing ceramic slurry with high solid content and low viscosity, in particular to a method for preparing ceramic slurry with high solid content and low viscosity by using non-spherical ceramic particles. Background technique [0002] Since the birth of gel injection molding technology, it has been committed to the preparation of high solid phase content and low viscosity ceramic slurry, so as to ensure that ceramic products with complex structure and excellent mechanical properties can be obtained after molding. In order to obtain ceramic slurry with high solid phase content and low viscosity, we can start from the perspective of dispersion stability of ceramic slurry. Huang Yong from Tsinghua University studied the influence of different dispersants on the stability of ceramic slurry, and concluded that Dispersion stability mechanism with the best dispersio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/63
CPCC04B35/10C04B35/63C04B2235/5418C04B2235/5427C04B2235/5436C04B2235/5463
Inventor 鲁中良苗恺李涤尘
Owner XI AN JIAOTONG UNIV
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