| 摘要 |
PURPOSE:To increase the sintered density up to >=97% and reduce the insertion loss when used for a device for a non-reciprocal line by using a specified powdery raw material as the main component and adding a metal peroxide thereto. CONSTITUTION:Constituent raw material compounds respectively containing each element of the powdery raw material represented by the formula [A is yttrium or one or more kinds of rare earth metal elements; B is one or more kinds of metals including iron; (x) satisfies 2.98<=x<=3.06] are blended according to the dry method and calcined at 1000 to 1200 deg.C for 2 to 4hr in an atmosphere of 1 to 10atm and 40 to 100% oxygen concentration. Copper peroxide (CuO2) and a binder are admixed therewith and the amount of the copper peroxide is <=1.5mol% based on the calcined material. The resultant mixture is dried and granulated and the obtained granules are molded into a shape required for each special use. The shaped material is heated to about 500 deg.C to burn up the binder and subsequently sintered together with an inert gas of Ar, nitrogen, etc., having 10 to 100% partial pressure of oxygen at 1200 deg.C under 4 to 10atm for 3 to 8hr, thus producing the objective dense ferrite sintered material having <=0.01% porosity. |
