PURPOSE: The titled composition that is obtained by admixing appropriately the following essential components: SiO2, B2O3, Al2O3 and Cu2O, thus being suitably used as an insulating coat under the load of large tensile stress.
CONSTITUTION: The objective glass composition is composed of, as essential components, 30W65mol% of SiO2, 11W45mol% of B2O3, 5W15mol% of Al2O3, and 10W20mol% of Cu2O and, as optional components, less than 5mol% of P2O5, less than 2mol% of V2O5, less than 2mol% of Na2O, less than 5mol% of PbO, less than 3mol% of SnO2 and less than 10mol% of ZnO. The total amounts of the essential components are required to exceed 85mol%. The resultant composition has a softening point of about up to 660°C and a thermal expansion coefficient of less than 40×10-17/°C. The composition is suitably used as an insulating coat formed on silicon steel plates.
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KONDOU KAZUO
SHIBATA YOSHIMASA
| JP43025205A |
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