Treatment of micropores in mica materials

• US 20070114704A1
• Filed: 01/23/2007
• Published: 05/24/2007
• Est. Priority Date: 06/14/2005
• Status: Active Grant

• Current Assignee: Siemens Energy Incorporated (Siemens AG)
• Original Assignee: Siemens Power Generation, Inc.
• Inventors: Smith, James, Stevens, Gary, Wood, John
• Granted Patent: US 7,955,661 B2
• Time in Patent Office: Days
• US Class Current: 264/643
• CPC Class Codes: D21H 13/44 Flakes, e.g. mica, vermiculite
• CPC Class Codes: D21H 17/13 Silicon-containing compounds
• CPC Class Codes: D21H 17/20 Macromolecular organic compounds
• CPC Class Codes: D21H 25/005 Mechanical treatment D21H25/08, D21H25/18 take precedence
• CPC Class Codes: D21H 27/00 Special paper not otherwise provided for, e.g. made by multi-step processes
• CPC Class Codes: H01F 27/2871 Pancake coils
• CPC Class Codes: H01F 41/127 Encapsulating or impregnating encapsulating coil and core H01F41/005
• CPC Class Codes: H01L 21/02107 Forming insulating materials on a substrate
• CPC Class Codes: H01L 21/316 composed of oxides or glassy oxides or oxide based glass
• CPC Class Codes: H02K 3/40 for high voltage, e.g. affording protection against corona discharges
• CPC Class Codes: H02K 9/227 Heat sinks
• CPC Class Codes: H05K 1/0373 containing additives, e.g. fillers H05K1/036 takes precedence
• CPC Class Codes: H05K 2201/0209 Inorganic, non-metallic particles
• CPC Class Codes: H05K 2201/0248 Needles or elongated particles; Elongated cluster of chemically bonded particles microfibers H05K2201/0251; stacked conductors H05K2201/0379
• CPC Class Codes: Y10T 428/249953 Composite having voids in a component [e.g., porous, cellular, etc.]

Abstract

A method for the treatment of micro pores (24) within a mica paper (20) that includes obtaining a silane with a molecular weight of between approximately 15 and 300, and adding the silane to the mica paper (20). Then reacting the silane with the inner surface of the micro pores within the mica paper. After this, a resin is impregnated into the mica paper, and the resin binds to the inner surfaces of the micro pores (24) with the mica paper through the silane.

Claims

1. A method for the treatment of micro pores within a mica paper comprising:

obtaining a silane with a molecular weight of between approximately 15 and 300;

adding the silane to the mica paper;

reacting the silane with the inner surface of the micro pores within the mica paper;

impregnating the mica paper with a resin;

wherein the resin binds to the inner surfaces of the micro pores with the mica paper through the silane.

2. The method of claim 1, wherein the silane is added to the mica paper by a solvent.

3. The method of claim 2, wherein the solvent is substantially removed prior to reins impregnation.

4. The method of claim 1, wherein the silane is at least one of silane (SiH4), silanol (SiH3OH), methylsilane (SiH3CH3), vinylsilane (SiH3CHCH2), aminosilane (SiH3NH2), alkoxysilane (SiH3OR) and epoxysilane.

5. The method of claim 1, wherein the silane is at least one of amino methyl trimethyl silane, 3-glycidyl oxy propyl trimethoxy silane, vinyl dimethyl silane, and allyl trimethyl silane.

6. The method of claim 1, wherein the silane has a molecular weight of between 32-90.

7. The method of claim 1, wherein the silane has a molecular weight of between 100-300, whereby the silane does not tend to go between contacted mica surfaces in the mica paper.

8. The method of claim 7, wherein multiple weights of silane molecules are used.

9. The method of claim 1, wherein the resin contains nano fillers.

10. The method of claim 9, wherein the nano fillers comprise 1-60% of the resin by weight.

11. The method of claim 9, wherein at least some of the nano fillers have been surface treated so that they may react with the silane.

12. The method of claim 1, wherein the mica paper is compressed prior to the addition of the silane.

13. The method of claim 12, wherein excess silane is removed while the mica paper is being compressed.

14. A method for the treatment of micro pores within a mica paper comprising:

obtaining a silane with a molecular weight of between approximately 15 and 300;

compressing the mica paper;

adding the silane to the mica paper;

reacting the silane with the inner surface of the micro pores within the mica paper;

impregnating the mica paper with a resin;

wherein the resin binds to the inner surfaces of the micro pores with the mica paper through the silane;

whereby contacted mica flakelet surfaces within the mica paper are less susceptible to exposure of the silane due to the compression.

15. The method of claim 14, wherein the amount of compression of the mica paper is between 5-30% of the thickness of the mica.

16. The method of claim 14, wherein the mica paper is compressed for the impregnation of the resin, and where the amount of compression for the impregnation of the resin is approximately the same as the amount of compression for the addition of the silane.

17. The method of claim 14, wherein the silane is added to the mica paper in solution.

18. The method of claim 17, wherein the mica paper is substantially dried of the solution prior to the resin impregnation.

19. The method of claim 14, wherein the silane has a molecular weight of between 32-90.