scispace - formally typeset
Search or ask a question
Topic

Carbide

About: Carbide is a research topic. Over the lifetime, 36331 publications have been published within this topic receiving 503586 citations.


Papers
More filters
Journal ArticleDOI
TL;DR: In this article, 1D nanobeam PCCs are used to achieve Purcell enhancement of two closely spaced defect zero-phonon lines (ZPL) using multiple techniques.
Abstract: Point defects in silicon carbide are rapidly becoming a platform of great interest for single-photon generation, quantum sensing, and quantum information science. Photonic crystal cavities (PCCs) can serve as an efficient light–matter interface both to augment the defect emission and to aid in studying the defects’ properties. In this work, we fabricate 1D nanobeam PCCs in 4H-silicon carbide with embedded silicon vacancy centers. These cavities are used to achieve Purcell enhancement of two closely spaced defect zero-phonon lines (ZPL). Enhancements of >80-fold are measured using multiple techniques. Additionally, the nature of the cavity coupling to the different ZPLs is examined.

99 citations

Journal ArticleDOI
TL;DR: In this article, the active to passive transition in the oxidation of sintered α-SiC has been determined by a thermodynamic approach and then experimentally under flowing air at high temperatures (1673-1973 K) and low pressures (oxygen partial pressure from 200-2100 Pa).
Abstract: The active to passive transition in the oxidation of sintered α-SiC has been determined by a thermodynamic approach and then experimentally under flowing air at high temperatures (1673–1973 K) and low pressures (oxygen partial pressure from 200–2100 Pa). Then, the physico-chemical behaviour of samples was compared for two different environments such as air-plasma atmosphere generated by microwaves, and a molecular atmosphere. The thermodynamic calculation does not predict any variation of the oxidation transition when changing the chemical state of oxygen (O2 or O) but experimentally the domain characterized by the formation of a passive layer of silica is extended to lower pressure under atomic oxygen (for the same temperature range) than in the case of molecular oxygen.

98 citations

Journal ArticleDOI
TL;DR: In this article, an extensive in situ Mossbauer spectroscopy study on highly dispersed Fe on carbon catalysts (Fe@C) produced through pyrolysis of a Metal Organic Framework was coupled to their FTS performance testing.

98 citations

Journal ArticleDOI
TL;DR: In this article, the structural evolution of an industrial Pd/C catalyst in the presence of hydrogen and acetylene was determined by means of in situ X-ray absorption spectroscopy and Xray powder diffraction.

98 citations

Journal Article
TL;DR: In this paper, a self-lubricating powder metallurgy composite, PM212, was developed and evaluated for use as seal inserts, bushings, small inside diameter parts and other applications where plasma-sprayed coatings are impractical or too costly.
Abstract: This paper describes a research program to develop and evaluate a new high temperature, self-lubricating powder metallurgy composite, PM212. PM212 has the same composition as the plasma-sprayed coating, PS212, which contains 70 wt percent metal-bonded chromium carbide, 15 wt percent silver and 15 wt percent barium fluoride/calcium fluoride eutectic. The carbide acts as a wear resistant matrix and the silver and fluorides act as low and high temperature lubricants, respectively. The material is prepared by sequential cold press, cold isostatic pressing and sintering techniques. In this study, hemispherically tipped wear pins of PM212 were prepared and slid against superalloy disks at temperatures from 25 to 850 C in air in a pin-on-disk tribometer. Friction coefficients range from 0.29 to 0.38 and the wear of both the composite pins and superalloy disks was moderate to low in the 10(exp -5) to 10(exp -6) cubic mm/N-m range. Preliminary tests indicate that the material has a compressive strength of at least 130 MPa over the entire temperature range of 25 to 900 C. This material has promise for use as seal inserts, bushings, small inside diameter parts and other applications where plasma-sprayed coatings are impractical or too costly.

98 citations


Network Information
Related Topics (5)
Microstructure
148.6K papers, 2.2M citations
93% related
Oxide
213.4K papers, 3.6M citations
87% related
Coating
379.8K papers, 3.1M citations
86% related
Amorphous solid
117K papers, 2.2M citations
85% related
Thin film
275.5K papers, 4.5M citations
85% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20231,218
20222,462
2021994
20201,277
20191,413
20181,471