Neodymium-iron-boron rotary hydrogen decrepitation furnace utilizing thermal expansion and cold contraction for pressurizing and sealing

Abstract

The invention discloses a neodymium-iron-boron rotary hydrogen decrepitation furnace utilizing thermal expansion and cold contraction for pressurizing and sealing. The neodymium-iron-boron rotary hydrogen decrepitation furnace structurally comprises a supporting bottom plate, a temperature reducer, two retainers, a controller, a rotating rod, a discharging pipe, a hydrogen decrepitation furnace body and a feeding pipe. The two retainers are mounted on the two sides of the supporting bottom plate, and the lower end of the temperature reducer is attached to the upper end of the supporting bottomplate. The right side of the controller and the left sides of the upper ends of the retainers are welded, and the right side of the rotating rod penetrates through the middle section of the lower endof the left side of the hydrogen decrepitation furnace body. Through the neodymium-iron-boron rotary hydrogen decrepitation furnace, the problems that a feeding pipe of a traditional hydrogen decrepitation furnace in the market often guides external air into the furnace during hydrogen decrepitation, especially in a machining workshop, the machining workshop is equipped with a large number of large cooling fans, the air is guided into the hydrogen decrepitation furnace through the feeding pipe more easily in the high-speed rotating process of the fans, consequently, the magnetic property of powder is weakened significantly, and neodymium-iron-boron fine powder is even likely to be naturally oxidized by the air to catch fire are solved.

Description

technical field [0001] The invention relates to a neodymium iron boron rotary hydrogen crushing furnace which is pressurized and sealed by thermal expansion and cold contraction, and belongs to the field of metallurgy. Background technique [0002] NdFeB is the third-generation rare earth permanent magnet material. It is called the king of permanent magnets because of its high coercivity. NdFeB cannot be exposed to the air because of its strong magnetic force, and will be oxidized to form reddish-brown rust. Boron permanent magnet materials need to be processed in a rotary hydrogen crushing furnace in metallurgical production to reduce the size of powder particles. The hydrogen crushing process requires the original air in the furnace to be discharged and then introduced into hydrogen for crushing. [0003] However, the feed pipe of the hydrogen crushing furnace on the market often introduces the outside air into the furnace during hydrogen crushing, especially in the proces...

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Problems solved by technology

[0003] However, the feed pipe of hydrogen crushing furnaces on the market often introduces outside air into the furnace during hydrogen crushing, especially in the processing workshop, which is equipped with a large number of large cooling fans, and it is easier to blow the The air is introduced into the hydrogen crushing furnace through the feed pipe, which will have a significant weakening effect on the magnetic properties of the powder, and may even cause the air to naturally oxidize the NdFeB fine powder and cause fire

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