| 摘要 |
PURPOSE:To raise a magnetic permeability in a high frequency area, and to improve a symmetricalness of a peak shift by forming a part of a magnetic circuit by a composite material obtained by a dispersing uniformly and three-dimensionally the second phase particles in a super-quenching alloy matrix consisting of amorphous and crystalline materials, etc. CONSTITUTION:An alloy base material 11 of a molten state is formed and injected into a mold 3 by melting mutually constituting metals Co, Fe, Si and B in a prescribed ratio in a vacuum high frequency melting furnace 2. Subsequently, a WC fine powder 4 is jetted by a necessary quantity toward a mold injecting flow of an alloy base material 1 by a high pressure argon gas from a bomb 6. In this way, an ingot 8 consisting of a Co-Fe-Si-B compound alloy in which the WC fine powder has been dispersed uniformly is obtained. Next, this ingot is put into a heat resisting pipe 7 made of a quartz glass, the inside of the pipe is replaced enough with gaseous argon 9, and thereafter, it is melted in a high frequency melting furnace 10. Subsequently, a piston 11 is operated and the lower end nozzle of the heat resisting pipe 7 is made to approach as near as possible the joining part of two rollers 12, 12 rotating at a high speed, an argon gas pressure in the heat resisting pipe is raised suddenly, the ingot 8 is supplied to the joining part of the rolls 12, 12 as a uniform continuous jet, and a ribbon-shaped core material 13 having specified width and thickness is obtained. |
