Iron-boron solid solution alloys having high saturation magnetization

• US 4,134,779 A
• Filed: 06/21/1977
• Issued: 01/16/1979
• Est. Priority Date: 06/21/1977
• Status: Expired due to Term

• Current Assignee: Allied Chemical Corporation (Honeywell International Inc.)
• Original Assignee: Allied Chemical Corporation (Honeywell International Inc.)
• Inventors: Hasegawa, Ryusuke, Ray, Ranjan
• Primary Examiner(s): Steiner, Arthur J.
• Application Number:
  US05/808,589
• Time in Patent Office: 574 Days
• Field of Search: 75/123 B, 75/122, 75/129, 148/121, 148/122, 148/31.55
• US Class Current: 148/121
• CPC Class Codes: C22C 45/02 with iron as the major constituent
• CPC Class Codes: H01F 1/15308 based on Fe/Ni H01F1/15325 takes precedence

Abstract

Ferromagnetic substitutional solid solution alloys characterized by high saturation magnetization and having a bcc structure are provided. The alloys consist essentially of about 4 to 12 atom percent boron, balance essentially iron plus incidental impurities.

Claims

1. A ferromagnetic material, having a saturation magnetization ranging from 16.6 to 20.0 k Gauss, a hardness ranging from 425 to 919 kg/mm² and an ultimate tensile strength ranging from 206 to 360 ksi and having a single phase formed in body centered cubic structure, consisting essentially of about 4 to 12 atom percent boron, balance essentially iron plus incidental impurities.

2. The ferromagnetic material of claim 1 consisting essentially of about 4 to 6 atom percent boron, balance essentially iron plus incidental impurities.

3. The ferromagnetic material of claim 1 in the form of substantially continuous filaments.

4. A process for fabricating substantially continuous filaments of a ferromagnetic material, having a saturation magnetization ranging from 16.6 to 20.0 k Gauss, a hardness ranging from 425 to 919 kg/mm² and an ultimate tensile strength from 206 to 306 ksi and having a single phase formed in body centered cubic structure, consisting essentially of about 4 to 12 atom percent boron, balance essentially iron plus incidental impurities, which comprises

(a) forming a melt of the material;

(b) depositing the melt on a rapidly rotating quench surface; and

(c) quenching the melt at a rate of about 10⁴ to 10⁶ °

C./sec to form the continuous filament.

5. The process of claim 4 in which the quench rate is at least about 10⁵ °

C./sec.

6. The process of claim 4 in which the ferromagnetic material consists essentially of about 4 to 6 atom percent boron, balance essentially iron plus incidental impurities.