Methods of producing microwave device

Details Methods of producing microwave device Methods of producing microwave device

1990-07-16

1992-07-28

Derrington, James

Metal working

Method of mechanical manufacture

Electrical device making

264 12, 264 13, 264 65, 501134, 501137, H01P 1100

Patent

active

051331292

ABSTRACT:
This invention concerns with microwave devices including resonant elements made from dielectric materials represented by the nominal formulas Ba.sub.2 Ti.sub.9 O.sub.20, BaTi.sub.4 O.sub.9, ZrTiO.sub.4 (Sn) and the like. The resonant element is produced conventionally by a process including numerous steps of mixing, drying, screening, calcining, ball milling, drying, screening or remilling and spray drying, forming and sintering. These steps may take 72 hours or more, prior to the forming step, and are labor and energy consuming. The improvement resides in the use of a reduced number of steps which include mixing precursor powders with addition of water and dispersants, spray drying or flocculating and drying the mixed formulation, forming and reactively sintering, so as to reduce the total processing time, prior to the forming step, to form about 8 to 24 hours. The sintering step is conducted in an oxygen-enriched atmosphere and may be followed by soaking and annealing to enhance the Q characteristics of the element. Resultant product characteristics, e.g. Q's, are superior or at least comparable to those of the conventionally produced product.

REFERENCES:
patent: 3938064 (1976-02-01), O'Bryan, Jr. et al.
patent: 4318995 (1982-03-01), Rhodes et al.
patent: 4337446 (1982-06-01), O'Bryan, Jr. et al.
patent: 4563661 (1986-01-01), O'Bryan, Jr. et al.

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