A method for melting oxide and metal mixture by using electromagnetic induction heating tungsten tube
An electromagnetic induction heating and metal mixture technology, applied in the field of high temperature metallurgy of materials, can solve the problems of uncertain metal ratio, no way to implement, uncontrollable degree of oxidation, etc., and achieve the effect of reducing contact time and large contact surface.
Active Publication Date: 2021-08-31
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Problems solved by technology
However, there are two difficulties in simulating the melting of the core. First, the degree of oxidation is uncontrollable, resulting in an uncertain proportion of the final metal in the mixture.
Furthermore, there is no way to implement in a neutral or protective atmosphere
Method used
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Embodiment 1
[0024] Weigh 3000 g of ZrO 2 Powder and 100 grams of Fe powder, wherein the Fe content accounts for 3.23wt,.% of the total molten material.
[0025] ZrO 2 Fe powder and Fe powder are mixed evenly and filled into a water-cooled copper crucible with an inner diameter of 120mm. After filling half of the mixture, one end of a tungsten tube with an outer diameter of 60mm and a wall thickness of 5mm is placed vertically in the mixture, and the remaining half of the mixture is placed in the crucible and tungsten. The gap in the middle of the tube is compacted with a thin iron rod. The other end of the tungsten tube is connected to the lifting device. There is no strict requirement on the lifting device, as long as it can control the lifting of the tungsten tube.
[0026] The furnace is evacuated to 10Pa and then high-purity argon is introduced. The above process is repeated 3 times, and the pressure of the final argon is -0.08MPa.
[0027] After heating with 40kW power for 3 minut...
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Abstract
The invention discloses a method for melting oxide and metal mixture by heating a tungsten tube by electromagnetic induction, and belongs to the technical field of high-temperature metallurgy of materials. A water-cooled copper crucible high-frequency induction heating furnace is used. The material to be melted is placed in the water-cooled copper crucible. One end of the high melting point tungsten tube is pre-embedded in the mixture, and the other end of the tungsten tube is connected to the lifting device. Melting in an inert atmosphere, the high-frequency electromagnetic field first heats the tungsten tube in the oxide, and the tungsten tube melts the surrounding oxide and metal mixture through heat conduction to form a small molten pool. Then start the tungsten tube lifting device, the tungsten tube is out of contact with the high-temperature molten pool, and the high-frequency electromagnetic field directly heats the small molten pool and gradually melts all the mixture materials. The tungsten tube can be used to successfully induce the molten mixture, and the tungsten tube with lifting function can reduce the contact time between tungsten and the melt, and prevent tungsten metal from entering the molten pool to affect the chemical composition of the melt.
Description
technical field [0001] The invention relates to the technical field of material high-temperature metallurgy, in particular to a method for melting oxide and metal mixture by using electromagnetic induction to heat a tungsten tube. Background technique [0002] When a severe accident occurs in a nuclear power plant with a core meltdown and the cooling water is lost, the UO 2 The fission heat of the fuel pellets causes the core temperature to rise sharply, melting the pellets, the outer Zr cladding, and the 508III tubesheet, and the temperature of the melt is as high as 2600°C. Since there is no electric furnace with an oxidizing atmosphere higher than 2000 °C, water-cooled crucibles are usually used to heat oxides by high-frequency induction to simulate core melting accidents. UO at room temperature 2 , ZrO 2 Most of the oxides are dielectrics, which cannot be heated and melted directly by high-frequency electromagnetic heating. Therefore, in the initial stage of electrom...
Claims
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IPC IPC(8): H05B6/24
CPCH05B6/24
Inventor 陈波梁田刘奎
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI