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INORGANIC BINDERS FOR C CORES
WESTINGHOUSE ELECTRIC CORP PITTSBURGH PA
Cores were constructed by fusing a 0.0002-in. glassy layer to the surfaces of magnetic steel strips and winding the flexible composite until the required build-up is attained. The viscosity of the glass is adjusted so that during the requisite stress relief anneal of the cores a laminar bond between the adjacent glassy layers is accomplished. A viscosity of approximately 10 to the 8th power poises at 800 C is required. To obtain a core free from residual stresses, the glass is also required to match the thermal expansivity of grain-oriented silicon steel. The problem in obtaining a composition which would have both a high viscosity and a high thermal expansivity is being solved by the synthesis of silicate glasses in the system R2O.X RO R2O3RO2.3-X SiO2. Processes for the surface preparation of the magnetic material for binder application have been developed. A suitable slip for binder application was determined. Author