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A method for preparing large-size silicon nitride ceramic balls for wind power generation

A silicon nitride ceramic ball and large-size technology, which is applied in the field of preparing large-size silicon nitride ceramic balls for wind power generation, can solve problems such as poor batch stability and uneven density of large-size ceramic bearing balls

Active Publication Date: 2022-07-15
BEIJING SINOMA SYNTHETIC CRYSTALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical task of the present invention is to address the above-mentioned existing problems, in order to overcome the problems of uneven density and poor batch stability of large-sized ceramic bearing balls, and to provide a method for preparing large-sized silicon nitride ceramic balls for wind power generation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A method for preparing large-sized silicon nitride ceramic balls for wind power generation, the implementation steps are as follows:

[0031] (1) put the TiC of 2% content, the yttrium oxide of 2% content, 2% magnesia into ball mill for 4h;

[0032] (2) put 95% of the silicon nitride powder and the auxiliary agent obtained in step (1) into the circulating stirring mill for full fusion, and the fusion time is 4 hours;

[0033] (3) the slurry obtained in step (2) is atomized by closed spray granulation to obtain spherical particles with a particle diameter of 100-200 microns;

[0034] (4) the powder material obtained in step (3) is loaded into the customized ball-making grinding tool and put into cold isostatic pressing to carry out ball pressing, the pressure is 160Mpa, and the dwell time is 100S;

[0035] (5) repairing the china ball pressed out in step (4), and repairing the excess material;

[0036] (6) put the china ball obtained in step (5) into the atmosphere pre...

Embodiment 2

[0040] A method for preparing large-sized silicon nitride ceramic balls for wind power generation, the implementation steps are as follows:

[0041] (1) put 1.5% TiC, 3% yttrium oxide, 3% magnesium oxide into a ball mill for 6h;

[0042] (2) put 92.5% silicon nitride powder and the auxiliary agent obtained in step (1) into the circulating stirring mill for full fusion, and the fusion time is 6 hours;

[0043] (3) the slurry obtained in step (2) is atomized by closed spray granulation to obtain spherical particles with a particle diameter of 100-200 microns;

[0044] (4) the powder material obtained in step (3) is loaded into the customized ball-making abrasive tool and put into cold isostatic pressing to carry out balling pressing, the pressure is 180Mpa, and the dwell time is 120S;

[0045] (5) repairing the china ball pressed out in step (4), and repairing the excess material;

[0046] (6) put the china ball obtained in step (5) into the atmosphere pressure sintering furna...

Embodiment 3

[0050] A method for preparing large-sized silicon nitride ceramic balls for wind power generation, the implementation steps are as follows:

[0051] (1) put 1% TiC, 3% yttrium oxide, 6% alumina into a ball mill for 6h;

[0052] (2) put 90% of the silicon nitride powder and the auxiliary agent obtained in step (1) into the circulating stirring mill for full fusion, and the fusion time is 6 hours;

[0053] (3) the slurry obtained in step (2) is atomized by closed spray granulation to obtain spherical particles with a particle diameter of 100-200 microns;

[0054] (4) the powder material obtained in step (3) is loaded into the customized ball-making abrasive tool and put into cold isostatic pressing to carry out balling pressing, the pressure is 180Mpa, and the dwell time is 120S;

[0055] (5) repairing the china ball pressed out in step (4), and repairing the excess material;

[0056] (6) put the china ball obtained in step (5) into the atmosphere pressure sintering furnace fo...

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Abstract

The invention discloses a method for preparing large-size silicon nitride ceramic balls for wind power generation. The system selects high-toughness silicon nitride materials through nano-modification, multiple solid solution, particle grading and other technologies; cold isostatic The large-size silicon nitride ceramic balls are prepared by the close-to-net-size molding technology; the optimal process route is determined by combining the post-treatment processes of air pressure sintering and hot isostatic pressing to overcome the shortcomings of the current large-size bearing balls. The present invention selects the high-toughness silicon nitride material by means of nano-modification, multiple solid solution, particle grading and other technologies; adopts cold isostatic pressing near-net-size forming technology to prepare large-size silicon nitride ceramic balls; combines air pressure sintering , Hot isostatic pressing sintering post-treatment process to determine the best process route to overcome the shortcomings of the current large-size bearing balls, such as large size, difficult sintering, uneven density gradient, low yield, and poor batch stability.

Description

technical field [0001] The invention relates to the technical field of ceramic preparation, and in particular provides a method for preparing large-sized silicon nitride ceramic balls for wind power generation. Background technique [0002] In recent years, the world's advanced wind power bearings, including yaw bearings, pitch bearings, especially spindle bearings, are mainly hybrid bearings. The rolling elements used in hybrid bearings are silicon nitride ceramic balls ( above), the material has the characteristics of high strength, high hardness, high temperature resistance, corrosion resistance, oxidation resistance, thermal shock resistance, creep resistance and good wear resistance, and it can still maintain its excellent performance at high temperature. It has been widely used in high-tech fields such as gas turbines, aerospace, nuclear industry, and high-efficiency engine parts. [0003] The working temperature range of silicon nitride ceramic ball hybrid bearing c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/565C04B35/622C04B35/645
CPCC04B35/565C04B35/622C04B35/6455C04B2235/3843C04B2235/6567C04B2235/77C04B2235/96
Inventor 韦中华郑彧李镔王子诚童亚琦陈波张哲张伟儒
Owner BEIJING SINOMA SYNTHETIC CRYSTALS CO LTD