Sealing of ceramic and cermet parts, sealing material therefor a

Details Sealing of ceramic and cermet parts, sealing material therefor a Sealing of ceramic and cermet parts, sealing material therefor a

1979-09-04

1982-02-23

Herbert, Jr., Thomas J.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

156 89, 428404, 428472, 501 14, 501120, 501122, 501128, 501104, 501105, 501153, 501154, B32B 516, B32B 900, C04B 3566

Patent

active

043169368

ABSTRACT:
The invention provides a particulate sealing material for use in preparing hermetic seals between ceramic and cermet members, which material comprises at least 70 wt. % refractory oxide and minor quantities of non-vitreous additive comprising SiO.sub.2, MgO and B.sub.2 O.sub.3. This particulate sealing material is conveniently pressed into the form of a coherent element shaped to suit the particular sealing operation concerned, e.g. the sealing of an open end of a ceramic arc tube to a cermet closure therefor. The invention also provides a method of sealing a ceramic component to a cermet member by interposing said sealing material between the opposed faces of the component and member and applying heat and pressure to sinter the sealing material and achieve a seal between the component and member. It has been observed that the sintered sealing composition in the completed seal can have a microstructure characterized by flattened refractory oxide-rich islands aligned generally parallel to said faces and substantially surrounded and interconnected by non-vitreous material rich in oxides of silicon, magnesium, and boron and said non-vitreous material forming layers thinner than said islands and also aligned generally parallel to said faces. The invention is of especial advantage in the closure of the second end of a ceramic arc tube containing volatile fill constituents, since the seal can be effected without melting of the sealing material and hence with improved retention of the tube fill constituents.

REFERENCES:
patent: 3252812 (1966-05-01), Lajarte
patent: 3556821 (1971-01-01), Hanzlik
patent: 3817764 (1974-06-01), Wolf et al.
patent: 4122042 (1978-10-01), Anna et al.
patent: 4155124 (1979-05-01), Kawahara et al.
patent: 4177235 (1979-12-01), Neidhardt et al.

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