Intermediate frequency furnace for sintering various volatile substances

Abstract

The invention discloses an intermediate frequency furnace for sintering various volatile substances, and belongs to the field of intermediate frequency furnaces. The intermediate frequency furnace comprises a furnace body, a heating body, an upper air inlet and a tungsten rod, wherein the heating body is arranged at the upper end inside the furnace body and provided with an upper opening, the upper air inlet is formed in the upper end of the furnace body and communicated into the furnace body, the tungsten rod is arranged at the bottom inside the heating body, lower air inlets are formed in the bottoms of the furnace body and the heating body, and the lower air inlets communicate the space outside the furnace body with the space inside the heating body. Due to the fact that the lower air inlets communicating the space outside the furnace body with the space inside the heating body are formed in the bottoms of the furnace body and the heating body, air inside the furnace body can be exhausted by the upper air inlet, hydrogen enters the heating body through the lower air inlets and then enters the furnace body through the upper opening in the heating body to build a hydrogen protective atmosphere, the hydrogen passing through the surfaces of sintered materials can be increased, the hydrogen atmosphere in the furnace body can be more uniform, and the sintering effect of the sintered materials in the whole furnace is consistent.

Description

technical field [0001] The invention relates to the field of intermediate frequency furnaces, in particular to an intermediate frequency furnace for sintering multi-volatile substances in the rare metal industry. Background technique [0002] The intermediate frequency furnace uses an intermediate frequency power supply to establish an intermediate frequency magnetic field to generate an induced eddy current inside the ferromagnetic material and generate heat to achieve the purpose of heating the material. Intermediate frequency furnaces are widely used, mainly for smelting carbon steel, alloy steel, special steel, or for smelting and heating of non-ferrous metals such as copper and aluminum, and can also be used for sintering of tungsten and molybdenum materials. [0003] Tungsten and molybdenum materials are generally sintered in an intermediate frequency furnace in a hydrogen atmosphere, because hydrogen is a flammable and explosive gas, and is the lightest gas among all ...

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Problems solved by technology

[0004] When sintering pure tungsten, blunt molybdenum and other materials with less volatiles, hydrogen as a reducing agent and a protective gas can meet the sintering requirements, but when sintering materials with more volatiles such as tungsten and tungsten aluminum, due to There are two paths for hydrogen gas passage, one is that hydrogen passes through the inside of the heating body to the hydrogen outlet, and the other is through the gap between the coil and the furnace wall to reach the hydrogen outlet, and the air resistance between the coil and the furnace wall is small, so the hydrogen passing through the surface of the material Limited, it is difficult to take away the volatile matter, so that the volatile matter in the material cannot be volatilized, and the sintering effect cannot be achieved. Increasing the hydrogen flow rate can improve the sintering effect, but due to the large amount of hydrogen required (300kg material per hour needs 100 cubic meters of hydrogen), which brings great difficulties to gas supply

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