Preparation method of high-toughness pressureless sintered boron carbide ceramic

A technology of boron carbide ceramics and high toughness, which is applied in the field of preparation of high toughness pressureless sintered boron carbide ceramics. It can solve the problems of grain growth, difficult sintering and densification, and deterioration of ceramic performance. Effect of increasing particle size concentration and promoting sintering densification

Inactive Publication Date: 2018-11-30
扬州北方三山工业陶瓷有限公司
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The current technology of pressureless sintered boron carbide ceramics mainly has the following problems: 1) pressureless sintered boron carbide ceramics are difficult to sinter and densify, and suitable sintering aids must be used to promote the sintering and densification of boron carbide ceramics; 2) pressureless sintered boron carbide ceramics are difficult to sinter and densify Sintered boron carbide ceramics have a high sintering temperature and are sensitive to the sintering temperature, which is prone to abnormal grain growth, thereby deteriorating the performance of the ceramic
3) The sintering temperature range of pressureless sintered boron carbide ceramics is narrow. Due to the large temperature gradient in the sintering furnace itself, this leads to a low yield of boron carbide ceramics (<50%)
The existence of these problems has seriously restricted the popularization and application of pressureless sintered boron carbide ceramics and the development of related industries.

Method used

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preparation example Construction

[0022] A method for preparing high-toughness pressureless sintered boron carbide ceramics, comprising the following components in weight percent: boron carbide powder 65-78wt%, sintering aid 10-17wt%, ceramic additive 8-20wt%, said sintering aid It is one or more of modified nano-carbon black, modified silicon carbide submicron powder, fumed white carbon black, titanium diboride micro-powder, titanium dioxide, and the ceramic additive is polyethylene glycol, amino alcohol, poly One or more of vinyl alcohol resin, maltodextrin, maltose, and low-viscosity water-soluble phenolic resin, and include the following steps:

[0023] Step 1: Put the above-mentioned components into the stirring mill according to the weight percentage, add a certain amount of solvent, and then perform the first stirring ball milling for pulping. The time for the first stirring ball milling pulping time is 6-8 hours, and then the slurry After 1-5 times of sand mill treatment, the treated slurry is subjecte...

Embodiment 1

[0032] Boron carbide powder 78wt%, modified nano-carbon black 4wt%, titanium diboride 2wt%, modified silicon carbide submicron powder 3wt%, maltodextrin 2wt%, polyvinyl alcohol resin 2wt%, maltose Put 7 wt% of slurry and 2 wt% of polyethylene glycol into a stirring mill, add a certain amount of deionized water, then carry out stirring ball milling for 6 hours, then pass the slurry through a sand mill for 3 times, and then pump the slurry Put it into the stirring mill and carry out stirring ball milling for 48h, the solid content of the ceramic slurry is controlled at 50 wt%, and the ceramic slurry that has been ground is subjected to centrifugal spray granulation, and the bulk density of the granulated powder is controlled at 0.8g / cm 3 , the inlet temperature of the centrifugal spray granulation tower is 210°C, the outlet temperature is 90°C, the particle size of the granulated powder is controlled between 40-150 mesh, and the obtained granulated powder is dry-pressed under a p...

Embodiment 2

[0035] Boron carbide powder 69wt%, modified nano-carbon black 4wt%, titanium dioxide 3wt%, fumed silica 9wt%, polyvinyl alcohol resin 2wt%, maltose syrup 10wt%, maltodextrin 2wt% and amino alcohol 1 wt% was put into the stirring mill, and a certain amount of deionized water was added, then the stirring ball milling was carried out for 6 hours, then the slurry was processed by the sand mill three times, and then the slurry was pumped into the stirring mill for stirring ball milling for 48 hours, The solid content of the ceramic slurry is controlled at 45 wt%, and the ground ceramic slurry is subjected to centrifugal spray granulation, and the bulk density of the granulated powder is controlled at 0.7g / cm 3 , the inlet temperature of the centrifugal spray granulation tower is 210°C, the outlet temperature is 90°C, the particle size of the granulated powder is controlled between 40-150 mesh, and the obtained granulated powder is dry-pressed under a pressure of 150MPa to obtain a g...

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Abstract

The invention relates to a preparation method of high-toughness pressureless sintered boron carbide ceramic. 65 to 78 wt% of boron carbide powder, 10 to 17 wt% of a sintering aid and 8-20 wt% of a ceramic additive are added into a stirring mill, and a certain amount of solvent is added, stirring ball milling-sand mill treatment-stirring ball milling process is performed, the solid content of ceramic slurry is 45 to 60 wt%, granulated powder is obtained by centrifugal spray granulation, the granulated powder is pressed into a green body, the green body is placed in a graphite sagger, graphite balls are placed around the green body, the graphite sagger is placed in a high-temperature vacuum sintering furnace for pressureless sintering, and finally the boron carbide ceramic is obtained. The low-price large-particle boron carbide powder is used as a raw material, and a multi-component eutectic non-oxide liquid phase is introduced to promote the densification of the boron carbide ceramic.

Description

technical field [0001] The invention relates to a preparation method of high-toughness pressureless sintered boron carbide ceramics. Background technique [0002] Boron carbide ceramics occupies an important position in structural ceramics. It has excellent characteristics, and its outstanding features are high hardness and low density. At room temperature, its hardness is second only to diamond and cubic boron nitride. In addition, it also has high modulus, good corrosion resistance and superior neutron absorption characteristics, so it is widely used as high-end bulletproof materials, neutron absorbing materials, high temperature structural materials and wear-resistant materials, etc., in nuclear energy, It has a wide range of applications in national defense and other fields. Especially in the field of protection, boron carbide ceramics are the most promising next-generation protective ceramic materials. Compared with alumina ceramics and silicon carbide ceramics, it ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/563C04B35/64
CPCC04B35/563C04B35/64C04B2235/3418C04B2235/3813C04B2235/608C04B2235/77C04B2235/96
Inventor 徐正平龙成勇史彦民
Owner 扬州北方三山工业陶瓷有限公司
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