Uniformly-composite spherical ceramic particles and preparation method thereof

A technology of ceramic particles and particles, which is applied in the field of uniform composite spherical ceramic particles and its preparation, to achieve the effects of improving production efficiency and no pollution and toxic gas emissions

Inactive Publication Date: 2014-10-08
CHANGZHOU FUNDANT SPECIAL MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: in order to solve the defects in the production of ceramic particles by the method of purging and a

Method used

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  • Uniformly-composite spherical ceramic particles and preparation method thereof
  • Uniformly-composite spherical ceramic particles and preparation method thereof
  • Uniformly-composite spherical ceramic particles and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0052] Zirconia-5% alumina composite ceramic microspheres. First, make a slurry of industrial grade zirconia powder and alumina powder below 0.5mm with water and 0.25% sodium hexametaphosphate at a ratio of 95:5, and grind it in a mill for 4-48 hours until D50 is less than 0.8 μm. Adjust the concentration and viscosity of the ground slurry in the transfer tank, add water and isopropanol with a weight ratio of 95:5, so that the solid content is 35-50%, and the viscosity is 200-600cPa. Then use a screw pump to add a pneumatic granulation device, and spray spherical ceramic particles with a target particle size into the drying tower through an atomizing spray gun. The product after pneumatic granulation is dried and sintered at high temperature after removing a small amount of by-products with irregular shapes. The typical drying temperature is 200-500°C, and the sintering temperature is 1300-1550°C. The sintered product then enters a ball mill for surface polishing. The granu...

Embodiment 2

[0056] Zirconium silicate-25% alumina composite ceramic microspheres. First, make a slurry of industrial grade zirconium silicate powder and alumina powder below 0.5mm with water and 0.5% triethylhexyl phosphoric acid at a ratio of 75:25, and then add it into the mill with a hopper for grinding for 4-48 hours. Grind to a D50 of less than 1 μm. Adjust the concentration and viscosity of the ground slurry in the transfer tank, add water and ethylene glycol with a weight ratio of 98:2, so that the concentration of general solid materials is 30-40%, and the viscosity is 500-700cPa. Then use a screw pump to enter the pneumatic granulation device. The product after pneumatic granulation is coarsely screened, dried and sintered at high temperature. The typical drying temperature is 200-500°C, and the sintering temperature is 1100-1200°C. The sintered product then enters a ball mill for surface polishing. The granular products polished by the ball mill are dried, coarsely sieved, a...

Embodiment 3

[0060] 500μm diameter yttria stabilized zirconia composite titania ceramic microspheres. First, 1μm yttrium stabilized zirconia powder and 2um industrial grade titanium oxide powder are mixed with water and 0.5% sodium tripolyphosphate at 80:20 to make a slurry, and then put into the mill with a hopper to grind for 4-48h, and then grind in the mill Medium grinding until the D50 is less than 0.5 μm, and the powder slurry is made into a composite and uniform powder through a spray drying equipment. Take out part of the powder and shear it at high speed with a high-speed disperser in a stirring tank. Depending on the particle size of the target seed, you can properly spray 0.1-1% aqueous solution of dispersant to help the formation of the embryo body. Place the embryo body granules and the remaining powder in a special equipment rolling granulator. During the rolling process of the equipment, the powder gradually wraps the embryo body and grows high-sphericity particles. The tar...

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Abstract

The invention relates to the technical field of ceramic-based powder materials and especially relates to uniformly-composite spherical ceramic particles and a preparation method thereof. The uniformly-composite spherical ceramic particles are high-sphericity degree nanoscale and submicron-scale powder aggregates, the aggregate is prepared from at least two different inorganic powder, the inorganic powder particles are bonded by sintering or intermolecular action, local density values of the uniformly-composite spherical ceramic particle from the center to the outer surface are gradually or stepwisely increased and the local density value of the outer surface of the uniformly-composite spherical ceramic particle is maximal The uniformly-composite spherical ceramic particle obtained by the preparation method has the advantages that in a mean volume diameter of 10-500 microns, the difference between the single-particle ingredients and particle total average ingredients is less than 3%, and more than 80% of the particles have a sphericity degree more than 0.92. The preparation method has no pollution and does not discharge toxic gas. The uniformly-composite spherical ceramic particle can be widely used for metal surface frosting treatment, member surface residual stress elimination treatment, strengthening treatment and fatigue-resistance treatment, and can be used for fine processing of nano-powder and preparation of a ceramic coating.

Description

technical field [0001] The invention relates to the technical field of ceramic-based powder materials, in particular to uniformly composited spherical ceramic particles and a preparation method thereof. Background technique [0002] The preparation and application research and development of ceramic-based powder materials is an important part of "advanced manufacturing technology", and it is one of the strategic high technologies that China and major developed countries in the world have determined to give priority to. [0003] Micron-sized ceramic particles with high sphericity are widely used in many industrial fields, such as wear-resistant treatment on the surface of ceramic and plastic products, grinding and stress relief on the surface of metal products, anti-wear and heat protection of transmission parts, granular and powdery Fine grinding of materials, etc. [0004] Usually, the production of such micron-sized spherical particles is to blow high-pressure air over th...

Claims

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Application Information

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IPC IPC(8): C04B35/488C04B35/16C04B35/622C22C29/08
Inventor 钱海鹏
Owner CHANGZHOU FUNDANT SPECIAL MATERIAL TECH
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