Samarium cobalt permanent magnet vacuum sintering furnace

Abstract

A samarium cobalt permanent magnet vacuum sintering furnace comprises a vacuum-pumping system, a furnace body, a graphite electric heater, a temperature control device, a fan cooling coil pipe and a PLC system. The vacuum-pumping system comprises a first roots pump, a second roots pump, a slide valve pump and a vacuum-pumping pipeline and can be adjusted and controlled. The furnace body comprises a sealing hearth composed of a heat insulation layer, a front door sealing pad and a back door sealing pad. A plurality of evenly-distributed graphite heating frame plates are arranged in the sealing hearth. A plurality of thermocouples which detect temperature of the sealing hearth are evenly arranged between the graphite heating frame plates. The fan cooling coil pipe is arranged at the back end of the sealing hearth. The vacuum-pumping pipeline is arranged between one side of the sealing hearth and the fan cooling coil pipe. The vacuum-pumping system can select different vacuum degrees, the graphite heating frame plates and the temperature-detecting thermocouples which are evenly arranged in the heating hearth monitor temperature in the furnace, and a high-temperature sintering zone, stable temperature and vacuum degree are formed. Permanent magnet product quality is improved, sintering furnace productivity effect is improved, product pass percent is improved by 30%, production efficiency is multiplied, and total energy is saved by more than 60%.

Description

technical field [0001] The invention relates to production equipment for samarium cobalt permanent magnet materials, in particular to a vacuum sintering furnace for rare earth permanent magnet samarium cobalt permanent magnet materials. Background technique [0002] The sintering furnace is one of the important equipments for the preparation of samarium cobalt permanent magnet materials. The compacts of samarium cobalt permanent magnet materials are sintered at high temperature to obtain the required properties. Vacuum sintering has extremely high requirements on vacuum degree and temperature stability. Therefore, in the process of sintering, in order to prevent the material from being oxidized and reduce the product quality, vacuum sintering molding is often used in the production process of samarium cobalt permanent magnet materials. The production process, the vacuum sintering process is to discharge the oxygen in the sintering device through the vacuum pump before sinter...

AI Technical Summary

Problems solved by technology

The sintering temperature directly determines the final magnetic properties of the SmCo permanent magnet. If the temperature is too high, the permanent magnet parts will burn out, and if the temperature is too low, the density will not be reached, so that the magnetic properties of the SmCo permanent magnet cannot meet the requirements. Uniformity will lead to the advantages and disadvantages of magnetic properties

At present, some sintering furnaces adopt microwave heating method. The heat generated by the microwave heater is discontinuous, and uniform heating cannot be performed, and the thermal hysteresis is obvious.

The temperature difference in each area of ​​the furnace is relatively large, resulting in an obvious gap in the magnetic properties of the entire furnace product, which makes the final product fail to meet the production requirements

Part of the sintering furnace is an external heating tube furnace, which has many defects such as low output, high energy consumption, and unstable temperature zone.

In the sintering cooling stage, a large amount of argon gas is often passed into the furnace and cooling water is passed into the water jacket to reduce the furnace temperature, but this method has poor heat dissipation, slow furnace temperature drop, and long production cycle

The existing vacuum sintering furnace used in the sintering process of samarium cobalt permanent magnet materials has many defects that affect product quality

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