Vacuum heat treatment method and equipment for NdFeB rare earth permanent magnetic devices

摘要

A vacuum heat treatment method for NdFeB rare earth permanent magnetic devices and an equipment thereof are disclosed. A rotary vacuum heat treatment equipment is for processing the NdFeB rare earth permanent magnetic devices with a vacuum heat treatment and obviously improves magnetic performance of the NdFeB rare earth permanent magnetic device, especially coercivity, which facilitates reducing a usage of heavy rare earth elements and protecting rare earth resources. Thus the vacuum heat treatment method and the equipment thereof are able to manufacture high-performance rare earth permanent magnetic devices.

主权项

1. A vacuum heat treatment method for NdFeB rare earth permanent magnetic devices, comprising steps of:
feeding NdFeB rare earth permanent magnetic devices into a rotary drum of a rotary vacuum heat treatment equipment for a heat treatment and simultaneously feeding balls and grains which contain rare earth elements therein; evacuating and then heating and rotating the rotary drum which rotates at a direction or rotates alternatively at two directions; when a temperature of the rotary drum reaches a heat preservation temperature, starting to preserving the temperature; when preserving the temperature is completed, cooling the rotary drum and a combination of the NdFeB rare earth permanent magnetic devices, the balls and the grains provided inside the rotary drum.