Metallurgically improved tip-off tube for a vacuum enclosure

Details Metallurgically improved tip-off tube for a vacuum enclosure Metallurgically improved tip-off tube for a vacuum enclosure

1987-11-23

1990-04-24

Lowrance, George E.

Receptacles

Envelope for electric lamp or similar device

With evacuating stem or valve

H01J 926, H01K 312

Patent

active

049192914

ABSTRACT:
A hollow, elongated tip-off tube 12 is comprised of a copper substrate having a layer of gold plating diffused into the surface thereof. The gold is applied over a nickel strike and the tube is heated within a vacuum furnace to diffuse the gold into the copper surface. The gold diffused inner surface of the tube is found to have superior self-welding characteristics and increased strength and durability. The nobility of the inner surface resists the formation of an oxide coating thereon which eliminates the need to clean the inner surface of the tube before pinch-off. Thus, the entrapment of residual cleaning chemicals within the pinch-off area is avoided.

REFERENCES:
patent: 2174381 (1939-09-01), Elder
patent: 2441841 (1948-05-01), Phelps
patent: 2491735 (1949-12-01), Howes
patent: 2554328 (1951-05-01), Grimes
patent: 2692298 (1954-10-01), Dailey
patent: 3203083 (1965-08-01), Obenhaus
patent: 4512488 (1985-04-01), Schwenk

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