| 摘要 |
1,251,198. Magnetic storage arrangements. R.C.A. CORPORATION. 27 Nov., 1968 [1 March, 1968], No. 56321/68. Heading H3B. A ferrite storage matrix is manufactured by forming two layers each consisting of a parallel set of conductors embedded in a doctor bladed or compressed magnetic powder sheet, assembling the two layers in facing relationship with the conductor sets arranged orthogonally and spaced apart by ferrite material, and then sintering the assembly into a unitary structure by heating to a temperature from about 950‹ to 1100‹ C. while at the same time applying pressure in the range of about 2000 p.s.i. to 12,000 p.s.i. The simultaneous application of heat and pressure is stated to minimize dimensional changes. A magnesium-manganezezinc ferrite may be used having a molar composition of 12À5 mole % ZnO, 25À5 mole % MgO, 22À0 mole % MnO and 40À0 mole % of Fe 2 O 3 . In one example parallel platinum or gold wire conductors are pressed into doctor bladed sheets so as to be flush with a major surface; the two layers so formed are then assembled, together with an intermediate plain ferrite sheet, into a stack with the conductor-embedded surfaces facing each other in readiness for heat and pressure sintering. In the second example an intermediate layer is not used and the sheets are formed of compressed powder, the conductors being first surface embedded and then buried by the application and compression of additional powder. In a modification the conductors are coated with magnetic material by repeated dipping and are then embedded in the sheets. Pressure may be applied along one or more axes of the assembled layers, inert pressure pads of indium being used to avoid adhesion. The ferrite powder used may be in the form of unreacted metal oxides or be in partial or complete reacted form. The pressure sintering takes place in air, vacuum or an inert atmosphere. |
