| 摘要 |
PURPOSE:To obtain a vibration-proof magnetic material having high magnetic properties and damping capacity even in a magnetic field and producing superior vibration-proof effect on application to a mechanism member to be noise- emitting and vibration-generating sources, by providing the above material consisting of an Si-Fe alloy with soft-magnetic characteristics and graphite in respectively prescribed weight ratio. CONSTITUTION:First, 85-99%, by weight ratio, of 1-6.5% Si-Fe alloy powder is mixed with 1-15% graphite powder, and the powder mixture is sintered at 1,050-1,140 deg.C for 1-24hr. At the time, mutual powders are uniformly mixed, so that a structure in which graphite is uniformly dispersed can be obtained, which is advantageous for sintering. Moreover, it is preferable that sintering is carried out under a hydrogen atmosphere. Further, as to slow heating and slow cooling to be applied tat the time of sintering, the former is carried out at a rate of <=100 deg.C/h and the latter at a rate of <=100 deg.C/h. Such slow cooling as mentioned above is exerted in order to precipitate graphite uniformly in grain boundaries. |
