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
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[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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