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Improving Impact and Wear Resistance of 2v-Permendur Alloys

IP.com Disclosure Number: IPCOM000043272D
Original Publication Date: 1984-Aug-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Griffing, BM: AUTHOR [+2]

Abstract

The technique described provides surface hardening of 2V-permendur alloys where it is desirable to retain the magnetic characteristics of the base material, while providing longer life for mechanical actuators. Samples of material measuring .100" in diameter and .375" long were first tested for the proper magnetic properties, then magnetically annealed by heating to 1550ŒF in a vacuum and then furnace cooling for two hours. A hardness of Rb-94 was observed throughout the section of sectioned samples. This established a base hardness factor. Other samples taken were first packed in fine charcoal and heated to 1550ŒF in air for 24 hours. After sectioning and polishing, these samples were determined to have a hardness of Rc-35-37 to a depth of approximately .027" while the core showed a hardness of Rb-94.

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Improving Impact and Wear Resistance of 2v-Permendur Alloys

The technique described provides surface hardening of 2V-permendur alloys where it is desirable to retain the magnetic characteristics of the base material, while providing longer life for mechanical actuators. Samples of material measuring .100" in diameter and .375" long were first tested for the proper magnetic properties, then magnetically annealed by heating to 1550OEF in a vacuum and then furnace cooling for two hours. A hardness of Rb-94 was observed throughout the section of sectioned samples. This established a base hardness factor. Other samples taken were first packed in fine charcoal and heated to 1550OEF in air for 24 hours. After sectioning and polishing, these samples were determined to have a hardness of Rc-35-37 to a depth of approximately .027" while the core showed a hardness of Rb-94. More samples were taken, packed in charcoal and heated to 1550OEF for two hours in air and then furnace cooled. After sectioning and polishing, these samples were determined to have a hardness of Rc-35 to 37 to a depth of approximately .003" while the core retained a hardness of Rb-94. A test fixture was devised and each sample was tested to ensure the force of attraction versus the displacement of the pole faces as a function of ampere-turns had not changed. No measurable difference was experienced. It was concluded that a method of hardening 2V- permendur material was possible without degrading the mag...