Plastic and nonmetallic article shaping or treating: processes – Including step of generating heat by friction
Patent
1981-12-18
1983-11-01
Fisher, Richard V.
Plastic and nonmetallic article shaping or treating: processes
Including step of generating heat by friction
65 32, 65 33, 65 43, 264 65, 501 63, 501 64, 501 66, 501 69, 501 9, C04B 3564
Patent
active
044129637
ABSTRACT:
The invention provides a method of producing discharge lamp arc tubes of ceramic material complete with metal cermet end closure members using initially incompletely fired sintered components and a sealing composition selected from silica, alumina and magnesia in proportions such that the composition falls within the accompanying ternary phase diagram BCDEFXYZPQ. The sealing compositions may also contain up to 5% by weight of nucleating agents such as phosphorous pentoxide, rare earth oxides, titania, zirconia or chromia. The inclusion of up to 5% by weight of boric oxide improves the flow characteristics and up to 10% by weight of Y.sub.2 O.sub.3, Yb.sub.2 O.sub.3, La.sub.2 O.sub.3, Dy.sub.2 O.sub.3, Eu.sub.2 O.sub.3, HfO.sub.2 improves the thermal and mechanical properties of the seals. The invention eliminates the need to make a first end seal by separate sintering and sealing operations.
REFERENCES:
patent: 4015048 (1977-03-01), Martin
patent: 4162151 (1979-07-01), Bhalla
patent: 4354964 (1982-10-01), Hing et al.
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