Extruded Ceramic Tube

The manufacturing process of the extruded ceramic tube includes 7 steps: Preparation of Premixed Liquid, Ball Milling, Vacuum Slushing and Extrusion Molding, Gelation, Drying and Demolition, High Temperature Sintering, and Machining Process.

1. Prepare The Premix: first take a certain amount of deionized water into the container, then use a balance to weigh enough acrylamide (AM) and N, N-methylenebisacrylamide (MBAM) as crosslinking agents, and take an appropriate amount Polyammonium methacrylate (MN) as a dispersant was added to deionized water to fully dissolve to make a premixed liquid; then weigh the α-alumina (a-Al2O3) powder with a particle size of 2-5 μm and account for α -magnesium oxide, silicon oxide or calcium oxide whose weight percentage of aluminum oxide is 1-6% by weight is added as a mineralizer to the premix to make raw mud;

2. Ball Mill: pour the raw mud prepared in the first step into a ball mill, add agate balls as a grinding body, and mill it for 18-22 hours to prepare mature mud;

3. Vacuum Mud Mulling and Extrusion Molding: take out the clinker mud from the ball mill, pour it into a conventional extruder(various shapes available, e.g. square extruder for ceramic square tube), set the extrusion rate and pressure, and complete the vacuum mud mulching and extrusion molding in the extruder to make tubular mud segment;

4. Gelation: install an electric heating mantle with a length of 200mm and a thermostatically controlled metal material on the extension of the extrusion nozzle of the extruder to quickly and uniformly heat the tubular mud section to 85-95°C, using heat to initiate quickly gelatinize the tubular mud section in motion into embryo body, and ensure that the density of extruded embryo body is uniform and the size is stable;

5. Drying and Deplasticizing: cut the body according to the required length and put it in a constant humidity drying box for 3-6 days, then send it to a box-type heating furnace and heat it to 600-650°C at a rate of 40°C/h. After being kept for 1-2h, it is cooled with the furnace to obtain the de-plasticized embryo body;

6. High-temperature sintering: the deplasticized green body is sent to a high-temperature furnace, heated to 1,650°C according to the conventional system, kept for 2-3h, and cooled with the furnace to obtain a extruded alumina tube;

7. Finally, according to the requirements of the required hollow ceramic tubes, the relevant positions are cut, punched and ground.

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