Transition Metal Carbides, Nitrides, and Carbonitrides

Lengauer, W.

doi:10.1002/9783527618217.ch7

Cited by 132 publications

(109 citation statements)

References 118 publications

Supporting

Mentioning

101

Contrasting

Unclassified

Order By: Relevance

“…The ceramic component showed nanohardness values ranging from ~26 GPa to ~29 GPa, whereas the binder phase had values from ~14 GPa to ~16 GPa. The hardness for the carbonitride phases was consistent with the values reported for the following binary ceramic phases: TiC, TiN, NbC, NbN, TaC and TaN [45]. However, the nanohardness obtained for the binder phases composed of intermetallic compounds was, as expected, significantly higher than the values found for constrained Co in hardmetals and cermets [14,54,55].…”

Section: Mechanical Propertiessupporting

confidence: 72%

“…The values observed were more characteristic of brittle intermetallic compounds. The nano-Young's modulus determined for the ceramic phase, between ~340 GPa and ~400 GPa, was also close to those reported for the binary ceramic phases [45]. Moreover, the values for the binder, between ~240 GPa and ~320 GPa, were also substantially higher that those corresponding to Co (209 GPa) or α-Co alloy [14] due again to the presence of the intermetallic compounds.…”

Section: Mechanical Propertiessupporting

confidence: 59%

“…This inhomogeneous microstructure can be explained based on an inhomogeneous temperature distribution within the sample during sintering, partly due to the short dwelling time at the maximum temperature. It is also clear from figures 2 and 3 that this effect only occurred when Ta and Nb were present in the carbonitride structure (cermets TiNb20Co, TiTa20Co, TiTa10Co and TiTa20Co5Mo), which probably induce a reduction in the thermal conductivity of the system as inferred by the differing thermal conductivities of transition metal carbides and nitrides [45]. Moreover, the presence of these refractory metals in the binder phase, as shown later by XEDS-SEM measurements, may be an additional reason for the microstructural inhomogeneities because a higher sintering temperature would be necessary to ensure a homogeneous molten binder.…”

Section: Synthesis Microstructure and Chemical Compositionmentioning

confidence: 99%

“…For example, cermets similar to Ti20Co and TiTa20Co presented Vickers microhardness values of 11.7 GPa and 11.9 GPa, respectively, with PS sintering, while values of 14.4 GPa and 15.7 GPa, were observed with HP (table 4). This improvement can be attributed to the reduction of both porosity, which was practically nonexistent (table 3), and ceramic particle size [45]) and lower than the typical values of commercial cermets (0.21-0.22) [50]. The presence of the intermetallic compounds, which possess a covalent component in the bonding between Co and the transition metal atoms [51], should lead to a reduction in the Poisson's ratio.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

See 3 more Smart Citations

Hot-pressing of (Ti, Mt)(C, N)–Co–Mo 2 C (Mt = Ta, Nb) powdered cermets synthesized by a mechanically induced self-sustaining reaction

Chicardi

Gotor

Medri

et al. 2016

Chemical Engineering Journal

View full text Add to dashboard Cite

A mechanically induced self-sustaining reaction (MSR) has been successfully employed for manufacturing powdered cermets based on Ti, Ti-Ta and Ti-Nb carbonitrides using Co as the binder phase and Mo2C as the sintering additive. The powders were sintered by hot-pressing, and complete chemical, microstructural and mechanical characterizations were performed on the densified cermets. When elemental Ta, Nb and/or Mo2C were added to the initial raw mixture submitted to the MSR process, smaller ceramic grains were observed after sintering, which suggested that ceramic particle growth was hindered by the presence of Ta, Nb and/or Mo in the host titanium carbonitride structure. Nanoindentation measurements enabled the determination of the hardness of the ceramic and binder phases, and values in the range of 26-29 GPa and 14-16 GPa were found, respectively. The high hardness values of the binder were related to the formation of intermetallic phases.2

show abstract

Section: Mechanical Propertiessupporting

confidence: 72%

Section: Mechanical Propertiessupporting

confidence: 59%

Section: Synthesis Microstructure and Chemical Compositionmentioning

confidence: 99%

Section: Mechanical Propertiesmentioning

confidence: 99%

See 2 more Smart Citations

Hot-pressing of (Ti, Mt)(C, N)–Co–Mo 2 C (Mt = Ta, Nb) powdered cermets synthesized by a mechanically induced self-sustaining reaction

Chicardi

Gotor

Medri

et al. 2016

Chemical Engineering Journal

View full text Add to dashboard Cite

show abstract

“…The atatase phase can be formed by oxidizing titanium nitride, titanium carbide, and titanium disulfide [13−16], i.e., the substitution of nitrogen, carbon, and sulfur by oxygen. Titanium carbonitride is harder and more oxidation resistant than titanium nitride [17,18]. Titanium nitride can be doped with carbon in order to control the phase transition during the oxidative heating.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic activity of titania layer prepared by oxidizing titanium compounds on titanium plate surface

Nishikiori

Takei

Oki³

et al. 2012

Applied Catalysis B: Environmental

View full text Add to dashboard Cite

Anatase-type nanocrystalline titania layers were prepared by oxidizing the crystalline titanium nitride and carbon-doped titanium nitride phases prepared on a titanium plate surface. Identification of the crystalline phase was confirmed by the XRD patterns and Raman spectra of these plates. The photocatalytic activity of the plates was evaluated by observing the photocalytic degradation process of acetaldehyde gas during UV irradiation by gas chromatography. A relatively larger amount of the anatase phase was formed on the very thin surface layer by heating the carbon-doped titanium nitride phase at 500ºC, and it exhibited a higher photocatalytic activity for the acetaldehyde degradation. The activity was determined not only by the amount of the anatase phase, but also by the crystallite size depending on the surface area and charge transfer efficiency. The photocatalytic activity is suggested to be due to the anatase phase existing on the thin surface layer accessible to the reactants.

show abstract

Carbides: Transition Metal Solid‐State ChemistryBased in part on the article Carbides: Transition Metal Solid State Chemistry by Peter Ettmayer & Walter Lengauer which appeared in the Encyclopedia of Inorganic Chemistry, First Edition .

Lengauer¹,

Eder²

2005

Encyclopedia of Inorganic Chemistry

View full text Add to dashboard Cite

Basic properties and use of transition metal carbides and carbonitrides are presented in this article. Starting from crystal chemistry, bonding, and preparation, the article also briefly discusses analytical chemistry of chemical and physical carbon analysis as well as thermodynamics. Updated versions of phase diagrams of group 4, 5, and 6 transition metals with carbon as well as phase diagrams of FeC and MnC are presented together with those of the most important transition metal carbonitride systems TiCN and ZrCN. A large part is devoted to the solid‐state properties because they make carbides and carbonitrides interesting materials for application. The presentation of these properties includes hardness, thermal properties, conductivities, carbon diffusivity, and elastic properties. Some ternary and quaternary carbonitrides are also discussed. Several of these properties are given as a function of temperature and composition. Examples for application of carbides in modern hardmetal types such as recent development in fine‐grained hardmetals and functional gradient hardmetals are included. The topic is closely connected to the article Nitrides: Transition Metal Solid State Chemistry.

show abstract

Transition Metal Carbides, Nitrides, and Carbonitrides

Cited by 132 publications

References 118 publications

Hot-pressing of (Ti, Mt)(C, N)–Co–Mo 2 C (Mt = Ta, Nb) powdered cermets synthesized by a mechanically induced self-sustaining reaction

Hot-pressing of (Ti, Mt)(C, N)–Co–Mo 2 C (Mt = Ta, Nb) powdered cermets synthesized by a mechanically induced self-sustaining reaction

Photocatalytic activity of titania layer prepared by oxidizing titanium compounds on titanium plate surface

Carbides: Transition Metal Solid‐State ChemistryBased in part on the article Carbides: Transition Metal Solid State Chemistry by Peter Ettmayer & Walter Lengauer which appeared in the Encyclopedia of Inorganic Chemistry, First Edition .

Contact Info

Product

Resources

About