| 摘要 |
PURPOSE:To obtain the titled bonding glass capable of remarkably reducing the presence of gap voids and generation of glass cracks by specifying the composition of the glass consisting of SiO2, B2O3, Al2O3, ZnO, Na2O, K2O, BaO and Fe2O3. CONSTITUTION:Glass composed of, by weight, 30-35% SiO2, 25-35% B2O3, 2-6% Al2O3, 12-21% ZnO, 6-8% Na2O, 6-9% K2O, 0-6% BaO and 2-4% Fe2O3, wherein the total amt. of the components is regulated to 100%, is used for forming the nonmagnetic part of a magnetic head consisting of Mn-Zn ferrite. The terminal expansion coefficient of the bonding glass for a magnetic head is matched with that of the ferrite. Consequently, the generation of glass cracks and presence of voids are simultaneously reduced in the course of cooling after heating to a working temp. and the bonding glass is suitable for the ferrite.
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