Gewinnung von mischkarbiden aus dem hilfsmetallbad

Jangg, G.; Kieffer, R.; Usner, L.

doi:10.1016/0022-5088(68)90032-5

Cited by 38 publications

(9 citation statements)

References 4 publications

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“…The hardness values for stoichiometric tantalum carbide agree with those generally reported for polycrystalline material and with recent data on single crystals also grown from a metal bath [14]. It is notable that stoichiometric tantalum carbide is considerably softer than most of the other monocarbides of the Groups IVB and VB transition metals.…”

Section: Discussionsupporting

confidence: 84%

“…A recent review [10] has pointed out that little information on the deformation characteristics and strengths of single crystals of tap-~aium carbide is yet available, although single fsrystals have been grown by several workers [11][12][13][14]. Mechanical property measurements have been made on a range of substoichiometric polycrystalline tantalum carbides made by carburising tantalum [15][16][17][18] or by hot-pressing powders [19,20].…”

Section: Introductionmentioning

confidence: 99%

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Structure and properties of tantalum carbide crystals

Rowcliffe¹,

Warren²

1970

J Mater Sci

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Single crystals of tantalum carbide, up to 2 mm in size have been grown from solution in a bath of molten iron. The slip plane was found to be {1 11} using a two-surface analysis on etch-pitted crystals deformed by microindentation at room temperature. Observations of etch-pit patterns around inclusions suggest that slip occurs on other planes at elevated temperatures. Maximum microhardness values between 3800 and 5200 Knoop (100 gm load) were found at a composition TaC0.83• In regions of crystals with a carbon content less than TaC0.83 a phase transformation was seen close to microhardness indentations in samples decarburised below 2200 ~ C. The mechanical behaviour of tantalum carbide is discussed with reference to a general model for the electronic structure of carbides. IntroductionLike the other monocarbides of the Group IVA and VA transition metals, tantalum carbide possesses the rock salt structure and exists over a wide range of substoichiometry. The most recent phase diagram [1] indicates the composition limits for single-phase tantalum carbide as TaCo.75 to TaC0.9s below about 1500 ~ C. A maximum melting point of 3983 ~ C occurs at TaC0.98. Storms [2] has suggested that the maximum melting point might lie at TaC0.s but he also points out that the actual values of composition and temperature are subject to some uncertainty due to the experimental difficulties in making the measurements [3]. A number of authors have reported a zeta-phase tantalum carbide [4-6] which might be a metastable compound [2,4,5]. Its composition has been determined as TaCo.75 [5] or TaC0.r4 [6], but it also appears to exist over a range of substoichiometry [7]. Yvon and Parth6 [7] have recently shown that the structure of the zeta-phase consists of an arrangement of twelve close-packed metal atoms in a unit cell, with the carbon atoms in octahedral interstices. The arrangement of the metal atoms can be regarded as alternate layers of hcp and fcc stacking, i.e. a close-packed structure containing 50~ stacking faults. Such a structure with a high density of faults is in accord with recent electron microscope studies of *Present address:

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Section: Discussionsupporting

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Structure and properties of tantalum carbide crystals

Rowcliffe¹,

Warren²

1970

J Mater Sci

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“…Many borides, carbides, silicides, and nitrides of the early transition metals have been obtained this way in well‐crystallized form, usually with higher purity than by direct reaction of the elemental components. Some of the early literature about metallic fluxes is cited in the introductory paragraphs of various papers reporting on the recrystallization of transition‐metal borides (e.g., TiB 2 , ZrB 2 , VB, NbB 2 , W 2 B 5 ) using iron, copper, aluminum, tin, or lead as fluxes,28–30 the preparation of the high‐melting carbides (e.g., TiC, WC, UC) with iron, cobalt, nickel, or aluminum as fluxes,31 and the preparation of various silicides of early transition metals (e.g., TiSi 2 , CrSi 2 , Mo 5 Si 3 , MoSi 2 , W 5 Si 3 , WSi 2 ) employing mainly copper or tin as fluxes 32. 33 Deitch reviewed the early literature on the growth of semiconductors, e.g., Si, SiC, AlP, GaAs, ZnS, ZnTe, ZnSiP 2 , CdSiP 2 ,34 and Lundström summarized the literature on the preparation and crystal growth of non‐oxidic refractories using molten metallic solutions 35.…”

Section: Historical Perspective On the Preparation And Crystal Gromentioning

confidence: 99%

The Metal Flux: A Preparative Tool for the Exploration of Intermetallic Compounds

2005

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This review highlights the use and great potential of liquid metals as exotic and powerful solvents (i.e. fluxes) for the synthesis of intermetallic phases. The results presented demonstrate that considerable advances in the discovery of novel and complex phases are achievable utilizing molten metals as solvents. A wide cross-section of examples of flux-grown intermetallic phases and related solids are discussed and a brief history of the origins of flux chemistry is given. The most commonly used metal fluxes are surveyed and where possible, the underlying principal reasons that make the flux reaction work are discussed.

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“…B. TiB 2 , ZrB 2 , VB, NbB 2 , W 2 B 5 ) aus Schmelzen von Eisen, Kupfer, Aluminium, Zinn oder Blei,28–30 zur Präparation hochschmelzender Carbide (z. B. TiC, WC, UC) aus Schmelzen von Eisen, Cobalt, Nickel oder Aluminium31 sowie zur Synthese diverser Silicide (z. B. TiSi 2 , CrSi 2 , Mo 5 Si 3 , MoSi 2 , W 5 Si 3 , WSi 2 ) aus Schmelzen von hauptsächlich Kupfer und Zinn 32.…”

Section: Historisches Zur Präparation Und Kristallzüchtung Aus Metunclassified

Metallische Schmelzen – Reaktionsmedien zur Präparation intermetallischer Verbindungen

2005

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Ziel dieses Aufsatzes ist es, die Vorzüge von flüssigen Metallen als Lösungsmittel bei der Synthese intermetallischer und ähnlich zusammengesetzter Verbindungen aufzuzeigen. Eine Vielzahl neuer Phasen mit zum Teil ungewöhnlichen Zusammensetzungen wurde in den letzten Jahren auf diese Weise erstmals hergestellt. Nach einem kurzen historischen Überblick werden die vorteilhaften Eigenschaften der eingesetzten Metallschmelzen (Flussmittel, Flux) für die Synthese eines breiten Spektrums von Verbindungen besprochen.

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Gewinnung von mischkarbiden aus dem hilfsmetallbad

Cited by 38 publications

References 4 publications

Structure and properties of tantalum carbide crystals

Structure and properties of tantalum carbide crystals

The Metal Flux: A Preparative Tool for the Exploration of Intermetallic Compounds

Metallische Schmelzen – Reaktionsmedien zur Präparation intermetallischer Verbindungen

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