The invention relates to a method for preparing an anisotropic bonded
magnet by adopting a pressure-keeping curing process. The method uniformly mixes anisotropic
magnetic powder,
epoxy resin or other thermosetting
adhesive,
coupling agent, lubricating agent and the like, so that compound
magnetic powder is produced, and orienting compression,
compression molding and pressure curing are then carried out. In pressure curing, certain
pressure stress is kept as the rough is heated to be cured. Pressure curing can adopts two methods: one method is in-situ pressure-prekeeping curing in a mould, i.e., after
compression molding and demagnetization, demoulding is not carried out before pressure is kept until the cross-linking curing of the
adhesive takes place to a certain degree (the
viscosity of the
epoxy resin is greater than 18000Pa multiplied by s); in the other method, after
compression molding, demoulding is directly carried out, and
pressure stress is then applied in the process of curing, for example, the
hot isostatic pressing method or the like is adopted to cure the rough under pressure. The adoption of the pressure curing technique can effectively enhance the magnetic property of the bonded
magnet.