End seal manufacture for ceramic arc tubes

Details End seal manufacture for ceramic arc tubes End seal manufacture for ceramic arc tubes

1988-10-05

1993-01-12

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

264332, C04B 3700

Patent

active

051788080

ABSTRACT:
An end plug for an arc tube for a high pressure discharge lamp is made by pressing alumina powder in a tapered cylindrical die so that the diameter of the as-pressed plug is greatest at that part of the plug that has the lowest as-pressed density. The variation in diameter of the as-pressed plug compensates for the variation in density so that upon high temperature sintering, the plug shrinks to a substantially uniform diameter.

REFERENCES:
patent: 3564328 (1971-02-01), Bagley
patent: 4011480 (1977-03-01), Jacobs
patent: 4160930 (1979-07-01), Driessen
patent: 4283652 (1981-08-01), Van Herck
patent: 4322654 (1982-03-01), Tielemans
patent: 4545799 (1985-10-01), Rhodes
patent: 4560903 (1985-12-01), Sneijers

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