Process of preparing monolithic seal for sapphire CMH lamp

Details Process of preparing monolithic seal for sapphire CMH lamp Process of preparing monolithic seal for sapphire CMH lamp

1998-02-11

2000-10-03

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Outside of mold sintering or vitrifying of shaped inorganic...

Producing hollow article

264642, 264656, 264657, 264662, 313624, B28B 100

Patent

active

061268895

ABSTRACT:
845 A method of producing a ceramic-metal-halide (CMH) discharge lamp having a monolithic seal between a sapphire (single crystal alumina) arc tube and a polycrystalline alumina end cap. The method includes the steps of providing an arc tube of fully dense sapphire and providing an end cap made of unsintered compressed polycrystalline alumina powder. The end cap is heated until it is presintered to remove organic binder material at a low temperature relative to the sintering temperature. The presintered end cap is placed on an end portion of the arc tube to form an interface therebetween. The assembled presintered end cap and arc tube are then heated to the sintering temperature wherein the end cap is fully sintered onto the arc tube and the sapphire tube grows into the end cap. A monolithic seal is formed at the previous interface between the end cap and the arc tube as the sapphire tube grows into the polycrystalline alumina end cap.

REFERENCES:
patent: 3385463 (1968-05-01), Lange
patent: 3564328 (1971-02-01), Bagley et al.
patent: 4354717 (1982-10-01), Rech et al.
patent: 4545799 (1985-10-01), Rhodes et al.
patent: 4563214 (1986-01-01), Seddon et al.
patent: 4694219 (1987-09-01), Hing
patent: 4707636 (1987-11-01), Morris
patent: 4765820 (1988-08-01), Naganawa et al.
patent: 4808882 (1989-02-01), Parker et al.
patent: 5099174 (1992-03-01), Coxon et al.
patent: 5426343 (1995-06-01), Rhodes et al.
patent: 5427051 (1995-06-01), Maxwell et al.
patent: 5451553 (1995-09-01), Scott et al.
patent: 5727975 (1998-03-01), Wei et al.
patent: 5742124 (1998-04-01), Kees et al.
Abstract of JP 54047380 A.

Affiliated with

Also associated with

Rating

Process of preparing monolithic seal for sapphire CMH lamp does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process of preparing monolithic seal for sapphire CMH lamp, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process of preparing monolithic seal for sapphire CMH lamp will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-191995