Vibro-pressed crucibles for induction furnaces

Markaryan, R. L.; Yam, V. M.; Oleinik, V. T.; Vlasov, V. V.; Prokhorova, I. Ya.; Val'dman, O. A.

doi:10.1007/bf01398404

Refractories

1981

DOI: 10.1007/bf01398404

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Vibro-pressed crucibles for induction furnaces

R. L. Markaryan

V. M. Yam

V. T. Oleinik

et al.

Abstract: The widely used method of making linings for induction furnaces by means of pneumatic rams is unproductive and laborious. The resulting crucibles have low density and strength and their density varies with height. The process of bringing these crucibles into operation after manufacture, including drying and firing during the first ungraded melt, is very laborious, requires large amounts of eleetrical power and metal burden, and constitutes an unproductive use of costly electrical equipment. The output of the f… Show more

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1987

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“…In view of this, vibratory compaction has been mainly studied on the materials such as silicon carbide [2,3], magnesite [4,5], corundum [6,7], and metal-ceramics [i]. The positive features of this method include the possibility of obtaining intricate industrial components having uniform density at small values of static load.…”

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Regularities of vibratory compaction of refractory bodies based on phosphate binders

Vorob'ev

Chernyakhovskii

1987

Refractories

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The vibratory compaction method is used for the production of various types of refractories. The positive features of this method include the possibility of obtaining intricate industrial components having uniform density at small values of static load.This method is most effective for the powders of brittle materials whose particles have the ability to form bridge-type bonds [i]. In view of this, vibratory compaction has been mainly studied on the materials such as silicon carbide [2,3], magnesite [4,5], corundum [6,7], and metal-ceramics [i]. The method iS less effective for the systems containing clay [8]; however; when rational selection of the granulometry is made, it is possible to obtain industrial products from chamotte bodies containing 10-20% clay [9].In the majority of publications, the aim has been to obtain specific products; there have been very few attempts to study the regularities of the vibratory~compaction process. In the case of silicon carbide [i0, ii] and chamotte [12], it was found that as the amplitude of vibrations is increased from 0.2 up to 1.5 mm, the properties of the unfinished product become stabilized at an amplitude of 1.4-1.5 mm. The magnitude of the static load depends on the design of the equipment and the material being shaped [13]. The maximum density and strength values of a silicon carbide body were obtained at a pressure of 0.13-0.38 N/mm 2 which amounts to 30% of the perturbation force [3,13]. It was established [14] that the body prepared for vibratory compaction of dinas products must have a moisture content of 6-7%.In all the previously conducted studies, clay or sulfate-alcohol mash (s.a.m) were used as technological binders. In contrast to these substances, phosphate binders react with the refractory filler in the cold condition, i.e., even during the stage of mixing and shaping the products [15, pp. 4-17; 16, 17]. Vibratory compaction of the chamotte systems containing orthophosphorie acid showed [18] that at an overload (pressure) of 0.025 N/mm 2, it is possible to obtain products having an apparent density 0a~ t of 1.95-1.97 g/em 3 and an ultimate compressive strength Ocm up to 20 N/mm 2. However, there is no systematic information in the literature regarding this aspect. In view of this, we studied the regularities of densification of the bodies prepared using phosphate binders as a function of the properties of the bodies and the parameters of vibratory compaction.A laboratory equipment for double-action (two-sided) vibratory compaction was designed and fabricated in order to carry out these studies (Fig. i). The positive features of a number of existing designs were incorporated in it: variation of the amplitude independent of the static load [13], impact nature of vibration [i0], double-action pressing owing to die construction on spring supports [i], and a special configuration of the upper punch. Incorporation of a lever and a special design of its coupling with the laboratory vibroplate (platform vibrator) made it possible, firstly, to convert angular (circ...

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mentioning

confidence: 99%

“…In view of this, vibratory compaction has been mainly studied on the materials such as silicon carbide [2,3], magnesite [4,5], corundum [6,7], and metal-ceramics [i]. In view of this, vibratory compaction has been mainly studied on the materials such as silicon carbide [2,3], magnesite [4,5], corundum [6,7], and metal-ceramics [i].…”

mentioning

confidence: 99%

Regularities of vibratory compaction of refractory bodies based on phosphate binders

Vorob'ev

Chernyakhovskii

1987

Refractories

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show abstract

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Vibro-pressed crucibles for induction furnaces

Cited by 1 publication

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Regularities of vibratory compaction of refractory bodies based on phosphate binders

Regularities of vibratory compaction of refractory bodies based on phosphate binders

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