Method for encapsulating elements such as magnets is sintered ce

Details Method for encapsulating elements such as magnets is sintered ce Method for encapsulating elements such as magnets is sintered ce

1996-06-16

1998-01-27

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Direct application of electrical or wave energy to work

Producing or treating magnetic product precursor thereof

264611, 264612, 264642, 427226, C04B 3332

Patent

active

057119120

ABSTRACT:
A process for forming a ceramic coated element formed by first encapsulating the element within a sacrificial material and then encapsulating the element and the sacrificial material with an unsintered ceramic material. The resultant combination of materials and elements is then controllably heated to a temperature that burns the sacrificial material prior to the curing of the ceramic material so as to permit the permeation of the burned sacrificial material through the ceramic material. As the ceramic material is sintered it shrinks around the encapsulated element to form the ceramic coated element. In the preferred embodiment of the invention the coated element is a magnet or magnetizable material that is magnetized to a preferred axis of magnetization during the cooling phase of the process.

REFERENCES:
patent: 2820720 (1958-01-01), Iversen
patent: 2844363 (1958-07-01), Clark
patent: 3536798 (1970-10-01), Nyman
patent: 3879234 (1975-04-01), Lee
patent: 4026746 (1977-05-01), Straw
patent: 4201831 (1980-05-01), Slusarczyk
patent: 4837114 (1989-06-01), Hamada

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