Dry-type preparation method of self-sintering magnesium oxide crucible of vacuum induction furnace

Abstract

The invention discloses a dry-type preparation method of self-sintering magnesium oxide crucible of a vacuum induction furnace. The dry-type preparation method orderly comprises the following steps of: paving a backing material inside a copper round induction tube bundle of the induction furnace; adding a crucible furnace construction material into the copper round induction tube bundle; constructing and tamping to form a furnace bottom; putting a graphite tire core into the copper round induction tube bundle, and keeping the axes of the graphite tire core and the copper round induction tube bundle overlapped; adding the furnace construction material into a gap in the periphery of the graphite tire core, gradually constructing and tamping to form a furnace body, adding a furnace opening material when the height of the furnace body is constructed and tamped to 1-2 rows from an upper opening of the copper round induction tube bundle, constructing and tamping the material to form a furnace opening; and supplying electricity to the copper round induction tube bundle to be baked, closing a vacuum room of the induction furnace, vacuumizing and charging argon to seal, sintering for 1-2 hours, adding a steel material for toughening the furnace, and washing the furnace. The magnesium oxide crucible prepared by the method is short in preparation process period, high in energy consumption and long in furnace life.

Description

technical field [0001] The invention belongs to the technical field of crucible preparation methods, and specifically refers to a dry-type production method of a vacuum induction furnace self-sintering magnesia crucible. Background technique [0002] Traditional self-sintered magnesia crucibles are prepared by wet methods. For example, the Chinese invention patent application number 200910064477.5 discloses a method for manufacturing aluminum titanate crucible products. The manufacturing method is: batching according to the mass percentage of the following raw materials: Al 2 o 3 50~57%, TiO 2 37~44%, additives (MgO, BaO, Y 2 o 3 , La 2 o 3 ) 6~8%; After mixing the ingredients evenly, add 18~23% of the binder aqueous solution (acrylamide, bispolyacrylamide, ammonium persulfate, tetramethylethylenediamine and water), and make it in a ball mill or a mixer Slurry; inject the slurry into the mold of the product, and take the green body out of the mold after solidificati...

AI Technical Summary

Problems solved by technology

However, because the additive is an aqueous solution, it is difficult to mix the materials, the labor intensity is high, and it is not easy to mix well; after the corresponding forming, the health preservation, baking, sintering and even furnace cleaning processes are complicated, the time is long, the energy consumption is large, the efficiency is low, and the water vapor in the crucible is difficult to timely Discharge, sometimes the vacuum degree in the vacuum chamber of smelting furnaces above 6 is still above 10Pa, making it impossible to smelt pure steel in 6~10 furnaces before the age of the furnace, the production organization is difficult, and the refining waste rate is high; especially discharged during baking and furnace cleaning after molding A large amount of water vapor cannot be carried out in a vacuum chamber, and magnesium oxide will inevitably react with carbon dioxide in the atmosphere to affect the life of the crucible