Method for manufacturing a substrate for a printed circuit board
OwnerSvein Hestevik, Tore Storfosseneinventors
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Abstract
In a method for the manufacture of a substrate for electrical components, a base of metallic material is first sandblasted and thereafter coated by means of a thermal process with a bonding layer of, for example, copper powder. Then the bonding layer is coated with a dielectric layer of a ceramic material, which also is applied by means of a thermal process, and the ceramic material is thereafter impregnated with silicone oil. Finally, the ceramic layer is provided with an electrical conducting layer, also by means of a thermal process, having a predetermined electrical conducting pattern and the finished substrate is cleaned by blasting it with glass spheres.
Claims13
A method for the manufacture of a substrate for electrical components, the substrate comprising a metal base, a dielectric layer and an electrical conducting layer having a conducting pattern, said method comprising the following successive steps:
- a) sandblasting the surface of the metal base with grains of alumina;
- b) within two hours after step a), coating the sandblasted surface of the base with a bonding layer by a thermal spray coating process;
- c) coating the bonding layer with a dielectric layer of a ceramic material by a thermal spray coating process;
- d) impregnating the dielectric layer of ceramic material with silicone oil by applying the silicone oil on the surface of the dielectric layer so that there is formed thereon a visible film of said oil and immediately thereafter removing the oil from the surface so that the visible film of silicone oil is no longer present;
- e) heating the dielectric layer to about 50.degree. C.;
- f) coating the dielectric layer with an electrical conducting layer by a thermal spray coating process, said conducting layer having an electrical conducting pattern;
- and
- g) cleaning the exposed surfaces of the dielectric layer and the electrical conducting layer by blasting them with glass spheres.
A method for the manufacture of a substrate for electrical components, the substrate comprising a metal base, a dielectric layer and an electrical conducting layer having a conducting pattern, said method comprising the following successive steps:
- a) coating the metal base with a dielectric layer of a ceramic material by a thermal spray coating process;
- b) impregnating the dielectric layer of ceramic material with silicone oil by applying the silicone oil on the surface of the dielectric layer so that there is formed thereon a visible film of said oil and immediately thereafter removing the oil from the surface so that the visible film of silicone oil is no longer present;
- c) heating the dielectric layer to about 50.degree. C;
- and
- d) coating the dielectric layer with an electrical conducting layer by a thermal spray coating process, said conducting layer having an electrical conducting pattern.
Dependencies are inferred from the claim text.