B - Operations – Transporting – 05 – D
Patent
B - Operations, Transporting
05
D
356/197
B05D 5/12 (2006.01) C03C 17/00 (2006.01) C03C 17/06 (2006.01) C04B 41/51 (2006.01) C04B 41/88 (2006.01) H05B 3/84 (2006.01)
Patent
CA 1157965
- 12 - ABSTRACT A method for developing a pattern of electrically conductive material on a ceramic substrate is disclosed. The method includes the steps of depositing on the ceramic substrate in a desired pattern a thin layer of a heat fusable material which contains a granular current conducting base metal. An encasing layer is deposited over the pattern formed of the heat fusable material. The encasing layer is formed from an oxygen barrier material containing an oxygen getting material. This encasing layer is non-heat fusable and nonreactive with the heat fusable material. All of this structure is heated in an oxygen containing ambient to a temperature sufficient to permit the heat fusable material to fuse to the ceramic substrate. The oxygen barrier material protects the granular, current conducting base metal of the fusable material from oxidation by physically blocking out oxygen and by chemically providing an oxygen getting material which will react with any oxygen which does manage to penetrate into the oxygen barrier material. The ceramic substrate, fused heat fusable material, and remaining oxygen barrier material thereon are cooled back to room temperature and any remaining oxygen barrier material is removed from the ceramic substrate.
379582
Ford Motor Company Of Canada Limited
Sim & Mcburney
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