Claims
- 1. A method for soldering an article comprising:
- placing on the article a composition comprising in combination a solder material and lossy heating particles in thermal contact with the solder material which particles have a Curie temperature at least equal to the flow temperature of the solder and which are sufficiently lossy to produce sufficient heating for flowing the solder when subjected to an alternating magnetic field, wherein the lossy heating particles (a) comprise ferrimagnetic particles or (b) comprise ferromagnetic particles and nonlossy particles having high permeability and being capable of providing magnetic circuit coupling through the ferromagnetic lossy heating particles; and
- subjecting the article and the composition to an alternating magnetic field to cause the lossy heating particles to heat the solder to its flow temperature.
- 2. A method according to claim 1 wherein the lossy heating particles are dispersed in the solder material.
- 3. A method according to claim 1 wherein the solder material comprises a solder paste.
- 4. A method according to claim 2 wherein the solder material comprises solder paste.
- 5. A method according to claim 1 wherein the lossy heating particles comprise a layer of particles.
- 6. A method according to claim 5 wherein the layer of lossy heating particles is on the surface of the solder material.
- 7. A method according to claim 6 wherein the lossy heating particles comprise ferrite particles.
- 8. A method according to claim 1 wherein the lossy heating particles comprise ferrite particles.
- 9. A method according to claim 8 wherein the lossy heating particles comprise ferrite particles having a conductive coating on the surface thereof.
- 10. A method according to claim 1 wherein the lossy heating particles are such that the surface thereof is wetted by the solder when the solder flows.
- 11. A method according to claim 1 wherein the lossy heating particles are such that the surface thereof is not wetted by the solder when the solder flows.
- 12. A method according to claim 1 wherein the ferrimagnetic particles further comprise nonlossy particles having a high permeability and being capable of providing magnetic circuit coupling through the ferrimagnetic lossy heating particles.
- 13. A method according to claim 1 wherein the article comprises a heat recoverable member and wherein the heat produced by the lossy heating particles at least in part causes the member to recover.
- 14. A solder composition comprising in combination a solder material and ferrimagnetic lossy heating particles which have a Curie temperature at least equal to the flow temperature of the solder and which are sufficiently lossy to produce sufficient heating for flowing the solder when subjected to an alternating magnetic field.
- 15. A composition according to claim 14 wherein the lossy heating particles are dispersed in the solder.
- 16. A composition according to claim 15 wherein the solder comprises solder paste.
- 17. A composition according to claim 14 wherein the solder comprises solder paste.
- 18. A composition according to claim 14 wherein the lossy heating particles comprise a layer of particles.
- 19. A composition according to claim 14 wherein the lossy heating particles comprise ferrite particles.
- 20. A composition according to claim 14 wherein the lossy heating particles comprise a conductive coating on the surface thereof.
- 21. A composition according to claim 14 comprising nonlossy particles having a high permeability and being capable of providing magnetic circuit coupling when the lossy heating particles are at or near their Curie temperature.
- 22. A composition according to claim 14 wherein the lossy heating particles are such that the surface thereof is wetted by the solder when the solder flows.
- 23. A composition according to claim 14 wherein the lossy heating particles are such that the surface thereof is not wetted by the solder when the solder flows.
- 24. A solder composition comprising in combination (a) a solder material, (b) ferromagnetic lossy heating particles which have a Curie temperature in the range between about the flow temperature of the solder and up to about 300.degree. C. above the flow temperature of the solder and which are sufficiently lossy to produce sufficient heating for flowing the solder when subjected to an alternating magnetic field and (c) nonlossy particles having a high permeability and being capable of providing magnetic circuit coupling when the ferromagnetic lossy heating particles are at or near their Curie temperature.
- 25. A composition according to claim 24 wherein the lossy heating particles are dispersed in the solder.
- 26. A composition according to claim 25 wherein the solder comprises solder paste.
- 27. A composition according to claim 24 wherein the solder comprises solder paste.
- 28. A composition according to claim 24 wherein the lossy heating particles comprise a layer of particles.
- 29. A composition according to claim 24 wherein the lossy heating particles comprise a nonconductive coating on the surface thereof.
- 30. An article suitable for connection to another article having deposited thereon at the point of connection a solder composition comprising in combination a solder material and lossy heating particles in thermal contact with the solder material which particles have a Curie temperature at least equal to the flow temperature of the solder wherein the lossy heating particles (a) comprise ferrimagnetic particles or (b) comprise ferromagnetic particles and nonlossy particles having a high permeability and being capable of providing magnetic circuit coupling through the ferromagnetic lossy heating particles and wherein the lossy heating particles are sufficiently lossy to produce sufficient heating for flowing the solder when subjected to an alternating magnetic field.
- 31. An article according to claim 30 comprising a heat recoverable cover thereon adapted for recovering onto the article.
- 32. An article according to claim 31 wherein the heat recoverable cover comprises a layer of lossy heating particles on a surface thereof.
- 33. An article according to claim 32 wherein the layer of lossy heating particles is on the inside surface of the heat recoverable cover.
- 34. An article according to claim 30 wherein the solder composition is on the form of a solder ribbon.
- 35. An article according to claim 30 wherein the solder composition is in the form of a solder preform.
- 36. A cored solder wire comprising lossy heating particles in the core thereof wherein the lossy heating particles have a Curie temperature at least equal to the flow temperature of the solder and which are sufficiently lossy to produce sufficient heating for flowing the solder when subjected to an alternating magnetic field wherein the lossy heating particles (a) comprise ferrimagnetic particles or (b) comprise ferromagnetic particles and nonlossy particles having a high permeability and being capable of providing magnetic circuit coupling through the ferromagnetic lossy heating particles.
- 37. A cored solder wire according to claim 36 comprising a flux in the core.
- 38. A solder ribbon which comprises the cored solder wire of claim 36 which has been flattened to form a solder ribbon.
- 39. Solder preforms which comprise segments of the solder ribbon of claim 38 which have been cut and shaped to form a solder preform.
- 40. An autoregulating system for soldering an article comprising:
- an article suitable for connection to another article having deposited thereon at the point of connection a solder composition comprising in combination a solder material and lossy heating particles which have a Curie temperature at least equal to the flow temperature of the solder and which are sufficiently lossy to produce sufficient heating for flowing the solder when subjected to an alternating magnetic field wherein the lossy heating particles (a) comprise ferrimagnetic particles or (b) comprise ferromagnetic particles and nonlossy particles having a high permeability and being capable of providing magnetic circuit coupling through the ferromagnetic lossy heating particles;
- an induction coil adapted to produce the magnetic field; and
- a power supply being adapted to provide power to the induction coil as alternating current at a preselected frequency effective for heating said particles.
- 41. A system according to claim 40 wherein the power supply comprises a constant current power supply.
- 42. A system according to claim 40 wherein the lossy heating particles are dispersed in the solder.
- 43. A system according to claim 42 wherein the solder comprises solder paste.
- 44. A system according to claim 40 wherein the solder comprises solder paste.
- 45. A system according to claim 40 wherein the lossy heating particles comprise a layer of particles.
- 46. A system according to claim 40 wherein the lossy heating particles comprise ferrite particles.
- 47. A system according to claim 40 wherein the lossy heating particles comprise a conductive coating on the surface thereof.
- 48. A system according to claim 40 wherein the ferrimagnetic particles further comprise nonlossy particles having a high permeability and being capable of providing magnetic circuit coupling when the ferrimagnetic lossy heating particles are at or near their Curie temperature.
- 49. A system according to claim 40 wherein the lossy heating particles are such that the surface thereof is wetted by the solder when the solder flows.
- 50. A system according to claim 40 wherein the lossy heating particles are such that the surface thereof is not wetted by the solder when the solder flows.
- 51. A system according to claim 40 wherein the article comprises a heat recoverable member which is heated by the lossy heating particles.
- 52. An assembly comprising:
- an induction coil adapted to produce a magnetic field;
- an article suitable for connection to another article having deposited thereon at the point of connection a solder composition comprising in combination a solder material and lossy heating particles which have a Curie temperature at least equal to the flow temperature of the solder and which are sufficiently lossy to produce sufficient heating for flowing the solder when subjected to an alternating magnetic field positioned in said alternating magnetic field wherein the lossy heating particles (a) comprise ferrimagnetic particles or (b) comprise ferromagnetic particles and nonlossy particles having a high permeability and being capable of providing magnetic circuit coupling through the ferromagnetic lossy heating particles; and
- a power supply connected to said induction coil, said power supply being adapted to provide power to the induction coil as alternating current at a preselected frequency effective for heating said particles.
- 53. An assembly according to claim 52 wherein the power supply comprises a constant current power supply.
- 54. An assembly according to claim 52 wherein the lossy heating particles are dispersed in the solder.
- 55. An assembly according to claim 54 wherein the solder comprises solder paste.
- 56. An assembly according to claim 52 wherein the solder comprises solder paste.
- 57. An assembly according to claim 52 wherein the lossy heating particles comprise a layer of particles.
- 58. An assembly according to claim 52 wherein the lossy heating particles comprise ferrite particles.
- 59. An assembly according to claim 52 wherein the lossy heating particles comprise a conductive coating on the surface thereof.
- 60. An assembly according to claim 52 wherein the ferrimagnetic particles further comprise nonlossy particles having a high permeability and being capable of providing magnetic circuit coupling when the ferrimagnetic lossy heating particles are at or near their Curie temperature.
- 61. An assembly according to claim 52 wherein the lossy heating particles are such that the surface thereof is wetted by the solder when the solder flows.
- 62. An assembly according to claim 52 wherein the lossy heating particles are such that the surface thereof is not wetted by the solder when the solder flows.
- 63. An assembly according to claim 52 wherein the article comprises a heat recoverable member which is heated by the lossy heating particles.
RELATED APPLICATIONS
This application is a continuation-in-part of U.S. Ser. No. 07/242,208 filed Sept. 9, 1988, now abandoned, and is a continuation-in-part of U.S. Ser. No. 07/404,621 filed Sept. 8, 1989.
US Referenced Citations (27)
Non-Patent Literature Citations (2)
Entry |
Lee, E. W., Magnetism, An Introductory Survey, pp. 201-204 (1970). |
Smit et al., Ferrites, pp. 155-160 (1959). |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
242208 |
Sep 1988 |
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