| 摘要 |
PURPOSE:To obtain an excellent magnetic alloy of low watt loss in subjecting an amorphous magnetic alloy to a heat treatment by providing >=1 times of forestage treatments for a constant time at the temp. lower than a max. temp. prior to holding said alloy at the max. temp. CONSTITUTION:When the temp. at which the crystallization of an alloy to be heat treated initiates is defined as Tx( deg.C), the holding temp. in the 1st stage is set higher than Tx- about 300 deg.C and lower than Tx- about 180 deg.C and the time thereof is set at about >=20min. The holding temp. in the final stage is set higher by about 30 deg.C than that in the 1st stage and lower by about 50 deg.C than Tx and the time is set at about >=1min. Here, the final high temp. annealing of the multistages heat treatments is for thorough relieving of the residual strains of the material and the temp. and time may be set according to the compsns. of the alloy. In the case of >=3 stages of annealing, it is preferable to set heat cycles so as to increase the holding temp. stepwise. |
