A kind of preparation method of high-strength boron carbide porous ceramics
A technology of porous ceramics and boron carbide, applied in the field of ceramic molding, can solve the problems of uneven distribution of pores, many closed pores, complicated preparation methods, etc., and achieve the effects of reducing the number of pores, uniform pore size, and simple control methods
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Embodiment 1
[0034] Embodiment 1, a kind of preparation method of high-strength boron carbide porous ceramics, its preparation method is as follows:
[0035] 1) Mixing: Weigh 180g of boron carbide with a particle size of 300µm and 20g of boron carbide with a particle size of 10µm, add 12g of water-soluble phenolic resin as a binder and sintering aid, and add 6g of carboxymethyl cellulose to form a 40% The aqueous solution of solid content is used as suspending agent, and 20g glycerol is used as lubricant.
[0036] 2) Ball milling: pour the raw materials into the ball milling tank, add 240°C of water, and then enter the stirring mill for 8 hours to make them fully mixed to obtain ceramic slurry;
[0037] 3) Spray granulation: Spray granulation of the slurry and control the outlet temperature to 100°C to obtain powder. Then pass the ceramic powder through a 60-mesh standard sieve, and then properly dry it to control its water content to 0.5%.
[0038] 4) Dry pressing molding: The obtained ...
Embodiment 2
[0041] Embodiment 2, a kind of preparation method of high-strength boron carbide porous ceramics, its preparation method is as follows:
[0042] 1) Mixing: Weigh 100g of boron carbide with a particle size of 100µm and 100g of boron carbide with a particle size of 5µm, add 16g of PVB as a binder, 12g of silicon carbide sintering aid, add 1.5g of sodium citrate pentahydrate suspending agent, and 10g of glycerin as lubricant.
[0043] 2) Ball milling: Pour the raw materials into the ball milling tank, add 350g of water, and then stir and mill for 24 hours to fully mix to obtain ceramic slurry;
[0044] 3) Spray granulation: Spray granulation of the slurry and control the outlet temperature to 100°C to obtain powder. Then pass the ceramic powder through an 80-mesh standard sieve, and then dry it properly to control its water content to 1.5%.
[0045] 4) Dry pressing molding: The obtained powder is passed through a dry pressing molding equipment to prepare a boron carbide ceramic...
Embodiment 3
[0048] Embodiment 3, a kind of preparation method of high-strength boron carbide porous ceramics, its preparation method is as follows:
[0049] 1) Mixing: Weigh 120g of boron carbide with a particle size of 30µm and 80g of boron carbide with a particle size of 2µm, add 10g of PVA as a binder, 16g of carbon black as a sintering aid, and 15g of glycerin as a lubricant.
[0050] 2) Ball milling: After pouring the raw materials into the ball milling tank, add 400% of water (the weight ratio of raw materials to water is 100:120), and then carry out planetary ball milling, and the ball milling time is 2 hours, so that they are fully mixed to obtain ceramic slurry;
[0051] 3) Spray granulation: Spray granulation of the slurry and control the outlet temperature to 100°C to obtain powder. Then pass the ceramic powder through a 120-mesh standard sieve, and then properly dry it to control its water content to 3%.
[0052] 4) Dry pressing molding: The obtained powder is prepared by dry...
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