Low-expansion ceramic roller, and preparation method thereof
A technology of ceramic roller and expansion type, which is applied in the field of ceramic roller processing and production, can solve the problems of affecting the quality of fired products, collisions, mutual extrusion of products, etc., achieves good resistance to rapid cooling and rapid heating, ensures normal operation, The effect of extending the service life
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[0097] Accordingly, see figure 1 , the present invention also provides a method for preparing a low-expansion ceramic roller, comprising:
[0098] S101, adding refractory clay, alumina, mineral raw materials, zirconium silicate and water into a ball mill to perform a ball mill.
[0099] The time of said primary ball milling is controlled at 0.5~2h.
[0100] S102, adding fused mullite particles and white corundum sand into the ball mill, performing secondary ball milling or stirring to obtain a slurry.
[0101] The time for the secondary ball milling or stirring is controlled within 0.1-1 h.
[0102] In steps S101 and S102, the ceramic roller rod raw materials are added in sequence according to the following formula (percentage by weight):
[0103] Fused mullite 20~40%
[0104] White corundum sand 2~20%
[0105] Mineral raw materials 2~20%
[0106] Refractory clay 15~50%
[0107] Aluminum oxide 10~40%
[0108] Zirconium silicate 1~15%.
[0109] Preferably, its main raw...
Embodiment １
[0174] First put 2250Kg of refractory clay, 1350Kg of alumina fine powder, 600Kg of kyanite fine powder, 450Kg of zirconium silicate and 2200Kg of water into a ball mill with a capacity of 5000L for about 1 hour, and then add 2138Kg of electric Fused mullite particles and 712Kg of white corundum sand were ball milled for another 0.5 hour.
[0175] The ball-milled slurry was spray-dried to prepare a powder with a moisture content of 5%. The dried powder was added with 2.0wt% carboxymethyl cellulose and 15wt% water and stirred in a strong mixer for 20 minutes. Then use the hydraulic direct-push granulator to smelt the mud twice, and then use the hydraulic direct-push pipe extruder to plastically extrude the formed tube. Fired at high temperature at 1550~1650°C, the thermal expansion coefficient (room temperature~1000°C) of the prepared ceramic roller is 5.35 10 -6 / °C.
Embodiment 2
[0177] First put 2100Kg of refractory clay, 1125Kg of alumina fine powder, 900Kg of kyanite fine powder, 375Kg of zirconium silicate and 2200Kg of water into a ball mill with a capacity of 5000L for about 1 hour, and then add 2250Kg of electric Fused mullite particles and 750Kg of white corundum sand were ball milled for another 0.5 hour.
[0178] The slurry produced by the ball mill is filtered, smelted, dried and crushed to prepare a powder with a moisture content of 8%. The dried powder is added with 2.8wt% carboxymethyl cellulose and 12wt% water. Stir in a strong mixer for 20 minutes, then use a screw-type mud mixer to refine the mud twice, and then use a screw-type vacuum extruder to plastically extrude the molded tube. After drying, the formed billet tube is subjected to isostatic pressing under a pressure of 180Mpa. Process treatment, and then firing at high temperature at 1550~1650°C, the thermal expansion coefficient (room temperature~1000°C) of the prepared ceramic r...
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