Easy-to-clean metal coating of electron-beam melting furnace wall, spraying method thereof and spraying device thereof

Abstract

The invention discloses an easy-to-clean metal coating of an electron-beam melting furnace wall, a spraying method thereof and a spraying device thereof. According to the spraying method, the metal coating is prepared by taking kerosene and pure oxygen as fuel and burning the fuel in a combustion chamber of the spraying device; at the same time pouring ion water into the combustion chamber for cooling and increasing pressure and adjusting a laval spray nozzle to control the constant pressure; taking nitrogen as powder carrying air source and spraying at a shorter spraying distance by using a short spray pipe with an internally installed flow dividing head. The metal coating has a certain thickness and the metal coating is low in bonding strength between furnace wall matrix, loose in internal microstructure, large in porosity, high in surface roughness, not free to fall off under the vacuum melting condition of 10<-2> Pa and prone to crust at a certain temperature, so that the coating can be easier to clean, the labor intensity of furnace cleaning operators can be greatly reduced, the damage and harm can be reduced and the content of the high-melting-point impurities in the cleanedshell-shaped coating can be less at the same time; the coating can be taken as a smelting recovery material and used as a spraying raw material, so that the economy of metal electron-beam melting machining can be significantly improved.

Description

technical field [0001] The invention belongs to the technical field of high melting point metal purification and processing, further belongs to the technical field of electron beam smelting, and in particular relates to an easy-to-clean metal coating on an electron beam smelting furnace wall and its spraying method and device. Background technique [0002] Electron beam smelting is a special vacuum metallurgical equipment. The electron gun in the furnace can focus the high-energy electron beam of tens to hundreds of kW on 1cm 2 At the left and right focal points, a high temperature of more than 3500°C is generated. When the high-energy electron beam is focused on the refractory metal raw materials such as titanium, tungsten, molybdenum, tantalum, and niobium to be smelted, these metals can be melted to achieve the purpose of smelting or refining. Due to the limited high-temperature area, the molten metal needs to drip into the molten pool below bit by bit, and be cooled by ...

AI Technical Summary

Problems solved by technology

Due to the limited operating space of the furnace cavity, it is difficult for the special cleaning equipment to play a role. The cleaning work is basically done manually, which is very hard and even dangerous.

For example, when smelting titanium and titanium alloys, when cleaning the titanium coating splashed on the furnace wall, dust will fly and sparks will radiate, which not only seriously damages the health of the operator, but also easily causes burns, scalds, and even fire accidents; in addition, When cleaning the furnace, manual methods such as shoveling, scraping, and grinding are often used. It is easy to mix the stainless steel, copper shavings, silicon, etc. of the furnace wall base material into the cleaned titanium, because iron, nickel, copper, etc. are difficult to purify and remove from titanium. , making it very difficult to recycle the cleaned matter, and the cleaned matter of titanium can only be treated as waste

Titanium and other high-melting-point metals are expensive, and the material loss caused by splashing has a great impact on the economic cost of smelting and processing

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