Magnetic implements from glassy alloys

• US 4,385,944 A
• Filed: 05/29/1980
• Issued: 05/31/1983
• Est. Priority Date: 05/29/1980
• Status: Expired due to Term

• Current Assignee: Allied Corp. (Honeywell International Inc.)
• Original Assignee: Allied Corp. (Honeywell International Inc.)
• Inventors: Hasegawa, Ryusuke
• Primary Examiner(s): Sheehan, John P.
• Application Number:
  US06/154,187
• Time in Patent Office: 1,097 Days
• Field of Search: 148/31.55, 148/31.57, 148/101, 148/102, 148/103, 148/104, 148/105, 148/108, 75/200, 75/201, 75/212, 75/223, 75/226, 75/228, 75/230, 264/111
• US Class Current: 148/104
• CPC Class Codes: B22F 3/006 Amorphous articles
• CPC Class Codes: H01F 1/15358 Making agglomerates therefrom, e.g. by pressing
• CPC Class Codes: H01F 1/15366 using a binder

Abstract

A method for making magnetic crystallized implements based on glassy metal alloys. Metallic glass alloy powder of suitable ferromagnetic composition is compacted by mechanical, by adhesive bonding or by thermomechanical processes. The resulting compacts can be heat treated to enhance magnetic properties. Compacted bodies exhibit excellent ferromagnetic properties, low remanence, low coercivity and high permeabilities.

Claims

1. A method for making molded magnetic metal alloy articles, comprising:

(a) admixing an insulator with ferromagnetic glassy metal powder;

(b) compacting said powder with mechanical pressure to form a consolidated magnetic glassy metal body, the powder particles being kept substantially separate by said insulator.

2. The method as set forth in claim 1 wherein the powder has a composition of the formula [Fe,Ni,Co]_88-65 [Mo,Nb,Ta,Cr,V]_0-10 [P,B,C,Si]_12-25.

3. The method according to claim 1 wherein the glassy metal powder is compacted into a form having a density of at least about 60 percent of theoretical maximum.

4. The method according to claim 1 wherein the glassy metal powder is compacted by cold pressing.

5. The method according to claim 4 wherein the cold pressing is performed isostatically with isotropic pressure applied to the article from all sides.