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Ferrites manufacture

Since the 1960s, the quaUty of M-ferrite manufactured has improved continuously, while the price has decreased considerably. Decisive progress in quahty was obtained by the appHcation of sinter additives (90), the introduction of pressing in a magnetic field (23), and the use of Sr instead of Ba, in combination with a sophisticated appHcation of Si02 (91,92). Important contributions to price reduction came from the development of fast multiple-die... [Pg.195]

This method revealed differences in the reactivities of commercial iron (III) oxide samples, declared as identical when using traditional surface area measurements [41]. The difference in the reactivities was checked by DSA during heat treatments of reaction mixtures corresponding to the technological conditions of ferrite manufacture. [Pg.165]

In 1989, 30% of the barium carbonate produced was used in glass manufacturing, 30% in brick and clay products, 20% in the manufacture of barium chemicals, 5% in the manufacture of barium ferrites, 5% in the production of photograpliic papers, and 10% in miscellaneous uses. [Pg.479]

Two or more soHd catalyst components can be mixed to produce a composite that functions as a supported catalyst. The ingredients may be mixed as wet or dry powders and pressed into tablets, roUed into spheres, or pelletized, and then activated. The promoted potassium ferrite catalysts used to dehydrogenate ethylbenzene in the manufacture of styrene or to dehydrogenate butanes in the manufacture of butenes are examples of catalysts manufactured by pelletization and calcination of physically mixed soHd components. In this case a potassium salt, iron oxide, and other ingredients are mixed, extmded, and calcined to produce the iron oxide-supported potassium ferrite catalyst. [Pg.195]

Selecting the core material is the first issue to be addressed. All core materials are alloys based on ferrite. The major factor in a material s worthiness is its loss at the frequency of operation and the flux density of the application. A good place to start is with the materials the core manufacturer s themselves recommend for PWM switching power supplies and those that are commonly used by the designers in the field (see Table D-f). [Pg.237]

Cubed compound, in PVC siding manufacture, 25 685 Cube lattice, 8 114t Cubic boron nitride, 1 8 4 654 grinding wheels, 1 21 hardness in various scales, l 3t physical properties of, 4 653t Cubic close-packed (CCP) structure, of spinel ferrites, 11 60 Cubic ferrites, 11 55-57 Cubic geometry, for metal coordination numbers, 7 574, 575t. See also Cubic structure Cubic symmetry Cubic silsesquioxanes (CSS), 13 539 Cubic structure, of ferroelectric crystals, 11 94-95, 96 Cubic symmetry, 8 114t Cubitron sol-gel abrasives, 1 7 Cucurbituril inclusion compounds,... [Pg.237]

Sodium ferrate, in sodium nitrite production, 22 855 Sodium ferrite, 14 543 Sodium fluoride, 22 825, 8 340 Sodium fluoroborate manufacture, 4 155 physical properties of, 4 152t thermodynamic properties of, 4 154t uses of, 4 156... [Pg.857]

Metal in gap (MIG) or ferrite heads are produced with a combination of machining, bonding, and thin-film processes. Thin-film inductive heads are manufactured using thin-fihn processes similar those of semiconductor 1C technology (discussed in Chapter 19). The thin-film head production process is rather unusual, as it involves both very thin and very thick films. We choose to present here a detailed summary of the fabrication process of thin-film inductive heads with a single-layer spiral coil. This may serve, once again to, illustrate the centrally important role of electrochemical deposition in connection with modem information technology. [Pg.336]

Fig. 3.12 Manufacturing processes for the ferrites (a) atmosphere controlled two step firing (b) usual heat-treatment (in Nj gas). In the hatched regions (1) and (6) in (a), the samples are heated or cooled under flowing N2 gas. In the other regions, Po. has to be controlled to obtain the required oxygen content. Fig. 3.12 Manufacturing processes for the ferrites (a) atmosphere controlled two step firing (b) usual heat-treatment (in Nj gas). In the hatched regions (1) and (6) in (a), the samples are heated or cooled under flowing N2 gas. In the other regions, Po. has to be controlled to obtain the required oxygen content.
Production. There are three important methods for manufacturing barium ferrite on an industrial scale the ceramic, hydrothermal, and glass crystallization methods. The main producers are Toshiba and Toda. [Pg.189]

The industry continues to research improvements in the present production cells. Special attention is being focused on developing inert anodes and cathodes. Ferrites may find use as inert anodes, while titanium diboride may become the optimum material for cathodes. Before commercial use of inert electrodes can be achieved, cell sidewall materials must be developed which will withstand extremely reactive conditions and further improvements (i.e., less solubility of the anode and cathode materials are required). Over the past 15 years, American and Canadian aluminum producers have channeled nearly 1.5 billion into manufacturing technology research, the modernization and computerization of plant facilities, and new and better applications for the metal. Some of the results achieved thus far include ... [Pg.63]


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