Download Tungsten Carbides: Structure, Properties and Application in by Alexey S. Kurlov PDF

By Alexey S. Kurlov

This e-book embraces the whole diversity of difficulties linked to part equilibria in “tungsten – carbon” binary method and similar ternary platforms, nonstoichiometry, affliction and order in numerous tungsten carbides, digital and crystal constitution of those carbides.
The major software of tungsten carbides is constituent in hardmetals for slicing instruments. within the final twenty years, the main lively efforts have been made in synthesis and alertness of nanocrystalline tungsten carbide for the construction of nanostructured hardmetals. the current booklet describes intimately diversified equipment for creation of nanocrystalline tungsten carbide. The peculiarities of sintering of Co hardmetals from nanocrystalline powders having various particle sizes are mentioned. fabrics scientists utilizing tungsten carbide to create novel superhard and difficult fabrics will locate this publication relatively useful.

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The both sample surface is etched by a mixture of 10 % NaOH and 30 % K3 Fe(CN)6 taken in the ratio 1 : 1 Cubic carbide γ-WC1−x can be directly visualized in the microstructure of samples quenched from higher temperature 2988–3023 K in the solid state, and also in the microstructures of samples quenched from the melt from temperature of 3043– 3063 K (Fig. 8). 00 at temperature 3030–3055 K (see Fig. 1, inset). 0 . 0 have the highest Tc equals 10–12 K. 0 y = 1 - x = C/W Fig. 9 Changes in the unit cell constant a B1 of cubic γ-WC1−x ≡ γ-WC y (y ≡ 1 − x) carbide with B1-type structure in its homogeneity region [43]: ( ) [19, 21], ( ) [37, 38], (•) [22], ( ) [39], ( ) [42].

2837 nm [7, 9, 10, 19]. In this structure, 20 2 Phases and Equilibria in the W–C and W–Co–C Systems Fig. 10 Hexagonal structure of higher δ-WC (WC) tungsten carbide: (•)C, ( )W W C _ Structure of δ -WC (space group P6m2) tungsten atoms W occupy positions 1(a) with coordinates (000) and carbon atoms are located in positions 1(d) with coordinates (1/32/31/2) [44]. Tungsten and carbon atoms in higher δ-WC (WC) carbide form simple hexagonal sublattices, in which C atoms are located in the centers of trigonal prismatic interstitials of the tungsten sublattice (Fig.

Thus, among tungsten carbides, only higher hexagonal carbide δ-WC (WC) has virtually no homogeneity region whereas lower carbides W2 C and cubic γ-WC1−x have relatively wide homogeneity regions. 1. Thus, among tungsten carbides, only higher hexagonal carbide δ-WC (WC) has virtually no homogeneity region whereas lower carbides W2 C and cubic γ-WC1−x have relatively wide homogeneity regions. It should be borne in mind that the conclusions made in those studies in which the structures of nonstoichiometric tungsten carbides were determined only from the XRD data are merely the assumptions.

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