Electromagnetic relay

Patent metadata

Field	Value
Publication number	US-9805893-B2
Application number	US-201314779826-A
Country	US
Kind code	B2
Filing date	Jul 31, 2013
Priority date	Apr 22, 2013
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

An electromagnetic relay ( 100 ) has high wear resistance, high corrosion resistance, and good magnetic properties. The electromagnetic relay ( 100 ) includes a magnetic component including an alloy layer on its surface formed by diffusion-coating of at least one element selected from the group consisting of Cr, V, Ti, and Al. The alloy layer has a thickness of 5 to 60 μm, inclusive.

First claim

The invention claimed is:

1. An electromagnetic relay, comprising:
an electromagnetic device including a magnetic component and a coil, the magnetic component including an iron component prepared by processing an iron material; and
a contact configured to be open and closed in cooperation with magnetization and demagnetization of the electromagnetic device,
wherein the iron component includes an alloy layer on a surface thereof, and the alloy layer is formed by diffusion-coating of at least one element selected from the group consisting of Cr, V, and Al diffused and penetrated into the iron component, and
the alloy layer has a thickness in a range of 5 to 60 μm inclusive, and
wherein a total of a maximum content of the at least one element selected from the group consisting of Cr, V, and Al at a plurality of positions in the alloy layer is in a range of 29 to 50 wt % inclusive at an exterior surface of the alloy layer.

2. The electromagnetic relay according to claim 1 , wherein the alloy layer is formed by diffusion-coating of the at least one element selected from the group consisting of Cr, V, and Al onto the iron component with a treatment time in a range of 5 to 15 hours inclusive at a treatment temperature in a range of 750 to 950° C. inclusive.

3. The electromagnetic relay according to claim 1 , wherein the iron material has a carbon content in a range of not less than 0 wt % and less than 0.15 wt %.

4. The electromagnetic relay according to claim 1 , wherein the iron component has a ferritic grain size of not more than 1 defined by JIS G0551 (2005).

Assignees

• Omron Tateisi Electronics Co

Inventors

• Shimoda Seiki

Classifications

• H01H50/16 Primary

  Magnetic circuit arrangements · CPC title

• H01H50/163

  Details concerning air-gaps, e.g. anti-remanence, damping, anti-corrosion · CPC title

• H01H2209/002

  Materials · CPC title

• C23C10/54

  Diffusion of at least chromium · CPC title

• C23C10/56

  and at least aluminium · CPC title