Synthetic Mica Investigations: I, A Hot‐Pressed Machinable Ceramic Dielectric

Comeforo, J. E.; Hatch, Richard A.; Humphrey, Richard A.; Eitel, Wilhelm

doi:10.1111/j.1151-2916.1953.tb12884.x

Cited by 11 publications

(3 citation statements)

References 4 publications

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“…To determine the chemical composition of the micas, pure mica specimens were prepared as follows: Mica crystals were split from crystallized mica blocks and were ground wet in a pot mill. A fraction of 25 to 50 mesh was taken and washed with water by decantation to separate finely ground glassy substances and foreign crystals such as forsterite. The purified mica specimens were used not only for the chemical analysis but for the determination of specific gravity and electrical properties.…”

Section: Isomorphism In Micamentioning

confidence: 99%

Synthetic Mica Research in Japan

Noda

1955

Journal of the American Ceramic Society

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Research on the synthesis of mica was started in Japan in 1938. As the first step, compositions which crystallize easily were investigated. The next step was the determination of the temperature of crystallization from melts and the rate of crystal growth. Experiments with growing of crystals were performed and these fundamental properties were determined. Various types of mica were synthesized. The results of (1) the determination of temperature of crystallization and rate of growth of fluor‐phlogopite from melts and (2) studies on the isomorphism in the various types of synthetic mica, e.g., chemical composition, crystal size, refractive index, electrical properties, heat of crystallization, and temperature of crystallization, are summarized. The practical uses of both synthetic mica and glass‐bonded synthetic mica ceramics are described.

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Section: Isomorphism In Micamentioning

confidence: 99%

Synthetic Mica Research in Japan

Noda

1955

Journal of the American Ceramic Society

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“…In a study of steatite, fosterite, and zircon-talc compositions (13B) it was shown that fosterite additions improve bodies as regards to dielectric losses at high frequencies and zircon-talc even lower dielectric losses. Synthetic mica investigations were continued at the Bureau of Mines, Norris, Tenn., and results reported (17C,2BC,37C).…”

Section: Cermets Ceramic Dielectrics and Specialmentioning

confidence: 99%

Ceramics

Mitchell¹

1954

Ind. Eng. Chem.

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“…It is reported tha.t the formation of fluorphlogopite structure is essential and responsible for machinable characteristics in aluminosilicate systems. 3 As steatite and pyrophyllite have sheet-like structure which resembles fluorphlogopite (synthetic mica), a combination of powders of these naturally occurring minerals with a suitable bond is expected to result in machinable ceFamics.…”

Section: Introductionmentioning

confidence: 99%

Development of Steatite Based Machinable Ceramic Insulators for Ultra High Vacuum System

Kulkarni

Dalvi

Barde

1991

Transactions of the Indian Ceramic Society

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Developmental work on machinable ceramics was carried out with compositions containing steatite and pyrophyllite with minor additions such as barium carbonate and calcium oxide. Cold pressed compacts of the mixtures of selected constitutents, after seasoning with a phospho-organic binder and curing at 800°C resulted in a machinable character. After machining, the samples had the desired electrical breakdown strength (13 kV/cm) and degassing rate of 1 x to-• torr.lit.sec-1 .cm-•. The roles of raw materials, the type of binder used and curing temperature on the development of machinable character of the steatite based ceramic compositions have been discussed in the present paper. IntroductionCeramic insulators play a very important role in electrical and electronic equipment including large scale op:!rations like transmission as well as efficient working of electronic devices like hybrid circuits which depend on the quality of ceramic substrates. When ceramic insulators are to be used in an ultra high vacuum (UHV) system, they have to satisfy stringent specifications, e.g. dimensional tolerance and degassing characteristics. Degassing is directly related to the efficiency of operation of UHV systems, because, in general, ceramic components used as insulators are seldom impervious. Insulating parts used in UHV systems are of intricate shape and need to have accurate dimensions within the given tolerance. Insulators made from machinable ceramics can fulfill the stringent requirements of UHV systems provided the composition and processing conditions are suitable to develop machinable character.Machinable ceramics based on various ceramic systems, such as Al 2 0 3 -Si0 2 (porcelain) and complex glass ceramic &ystems like Mg0-AI 2 0 3 -Si0 2 are selected on the basis of property requirements and application. Machinable ceramics based on alumina are preferred particularly for high temperature, high vacuum equipment. Looking into the requirements of UHV systems, an in-house development, it was felt necessary

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Synthetic Mica Investigations: I, A Hot‐Pressed Machinable Ceramic Dielectric

Cited by 11 publications

References 4 publications

Synthetic Mica Research in Japan

Synthetic Mica Research in Japan

Ceramics

Development of Steatite Based Machinable Ceramic Insulators for Ultra High Vacuum System

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