Ferrite binding glass composition

Abstract

Abstract PURPOSE: To provide the titled composition contg. SiO 2 , B 2 O 3 , ZnO, BaO, Na 2 O, K 2 O, Al 2 O 3 , etc. in a specified wt. ratio and useful mainly for a video head using SiO 2 as a nonmagentic body layer. CONSTITUTION: Glass having a composition consisting of, by wt., 9W21% SiO 2 , 22.5W30.5% B 2 O 3 , 27W34% ZnO, 8.5W18% BaO, 8.5W12.5% Na 2 O+K 2 O and ≤4.5% Al 2 O 3 is used as ferrite binding glass for a magnetic head having a glass reinforced part on the tape sliding surface and using SiO 2 as a nonmagnetic body layer. This glass has a thermal expansion coefficient suitable for bindig Mn-Zn ferrite, high wear resistance, sufficient mechanical workability and high hardness. Since this glass can well be freed of bubbles at ≤770°C, glass-ferite interdispersion occurs hardly. In addition, this glass is slightly reactive with SiO 2 , so it gives high accuracy gap width when used for a head using SiO 2 as a nonmagnetic body layer. COPYRIGHT: (C)1981,JPO&Japio

Inventors

• 👤 Shinichi Komatsu
• 👤 Shoichi Iwanaga
• 👤 Nobuyuki Sugishita

Bibliographic Details