Multi-layer susceptor design for magnetic flux shielding in directional solidification furnaces

Patent metadata

Field	Value
Publication number	US-10711367-B2
Application number	US-201715797888-A
Country	US
Kind code	B2
Filing date	Oct 30, 2017
Priority date	Oct 30, 2017
Publication date	Jul 14, 2020
Grant date	Jul 14, 2020

Abstract

An induction furnace assembly comprising a chamber having a mold; a primary inductive coil coupled to the chamber; a layered susceptor comprising at least two layers of magnetic field attenuating material surrounding the chamber between the primary inductive coil and the mold to nullify the electromagnetic field in the hot zone of the furnace chamber.

First claim

What is claimed is:

1. A process for directional solidification of a cast part comprising:
energizing a primary induction coil coupled to a chamber having a mold containing a casting material;
generating an electromagnetic field with the primary induction coil within the chamber, a susceptor coupled to said chamber between said primary induction coil and said mold;
transducing at least a portion of said electromagnetic field into heat energy used to heat said mold;
attenuating at least a portion of said electromagnetic field with said susceptor, wherein said susceptor comprises at least two layers of electromagnetic shield material, wherein said susceptor comprises a first layer and a second layer enclosing an interior layer; and said first layer and said second layer are configured for protecting the interior layer from material degradation; and
casting the material within the mold wherein the interior layer comprises at least one of a castable nickel-based or Co-based superalloy and castable ferrous alloys.

2. The process according to claim 1 , further comprising:
selecting said electromagnetic field shield material of each of said first layer, second layer and said interior layer responsive to a capacity as an electromagnetic shield for attenuating a total electromagnetic field emitted by said primary induction coil in order to provide a directional solidification casting process in at least one of an absence of a magnetic flux and a partial absence of a magnetic flux.

3. The process according to claim 1 , further comprising:
selecting said electromagnetic field shield material for attenuation of said electromagnetic field at predetermined temperature ranges used in casting material alloys.

4. The process according to claim 1 , wherein the first layer and the second layer can comprise a ceramic material.

5. The process according to claim 1 , wherein the first layer and the second layer comprise a thermal barrier coating material.

6. The process according to claim 1 , wherein the first layer and the second layer comprise a refractory material.

7. The process according to claim 1 , wherein the second layer comprises at least one of a cobalt, an iron, a copper and a nickel material.

8. The process according to claim 1 , wherein the second layer comprises conductive or magnetic ceramic material.

9. The process according to claim 1 , wherein the second layer comprise an alloy composed of W, Ta, V, Mo and/or Nb in some mixture.

Assignees

• United Technologies Corp
• Raytheon Technoiogies Corp

Inventors

• Mantese Joseph V
• Breneman Ryan C
• Rebbecchi Thomas Anthony
• Boyne Andrew
• Marcin John Joseph
• Davis Dustin W
• Furrer David Ulrich
• Auxier James Tilsley

Classifications

• F27D11/06 Primary

  Induction heating, i.e. in which the material being heated, or its container or elements embodied therein, form the secondary of a transformer · CPC title

• B22D27/045

  Directionally solidified castings · CPC title

• F27B14/061

  Induction furnaces · CPC title

• F27B14/14

  Arrangements of heating devices · CPC title

• B22D27/02

  Use of electric or magnetic effects {(for continuous casting B22D11/015, B22D11/11)} · CPC title