Journal ArticleDOI
Superhard nanocrystalline silicon carbide films
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TLDR
In this article, nanocrystalline silicon carbide films were deposited on molybdenum substrates, with substrate temperature ranging from 750-1250°C to 1200°C.Abstract:
Nanocrystalline silicon carbide films were deposited by thermal plasma chemical vapor deposition, with film growth rates on the order of 10μm∕min. Films were deposited on molybdenum substrates, with substrate temperature ranging from 750-1250 °C. The films are composed primarily of β-SiC nanocrystallites. Film mechanical properties were investigated by nanoindentation. As substrate temperature increased the average grain size, the crystalline fraction in the film, and the hardness all increased. For substrate temperatures above 1200 °C the average grain size equaled 10-20 nm, the crystalline fraction equaled 80-85 %, and the film hardness equaled approximately 50 GPa.read more
Citations
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Plasma-aided nanofabrication: where is the cutting edge?
TL;DR: Plasma-aided nanofabrication is a rapidly expanding area of research spanning disciplines ranging from physics and chemistry of plasmas and gas discharges to solid state physics, materials science, surface science, nanoscience and nanotechnology and related engineering subjects as discussed by the authors.
Journal ArticleDOI
A Crossover in the Mechanical Response of Nanocrystalline Ceramics
Izabela Szlufarska,Izabela Szlufarska,Aiichiro Nakano,Aiichiro Nakano,Priya Vashishta,Priya Vashishta +5 more
TL;DR: Simulations of indentation of nanocrystalline silicon carbide reveals unusual deformation mechanisms in brittle nanophase materials, resulting from the coexistence of brittle grains and soft amorphous grain boundary phases, critical for the design of ceramics with superior mechanical properties.
Journal ArticleDOI
Design of Nanomaterial Synthesis by Aerosol Processes
TL;DR: This review provides an access point for engineers to the multiscale design of aerosol reactors for the synthesis of nanomaterials using continuum, mesoscale, molecular dynamics, and quantum mechanics models spanning 10 and 15 orders of magnitude in length and time, respectively.
Journal ArticleDOI
Nanoscale engineering of radiation tolerant silicon carbide
Yanwen Zhang,Yanwen Zhang,Manabu Ishimaru,Tamas Varga,Takuji Oda,Christopher M. Hardiman,Haizhou Xue,Yutai Katoh,Steven Shannon,William J. Weber,William J. Weber +10 more
TL;DR: The remarkable radiation resistance in the nano-engineered SiC is attributed to the high-density of SFs within nano-sized grain structures that significantly enhance point defect annihilation.
Journal ArticleDOI
Nanomechanical properties of TiO2 granular thin films.
TL;DR: DTA/TGA results confirmed the weight loss and the endothermic reaction due to desorption of chemisorbed water, and decrease in hardness above 300 °C annealing is attributed to thermal diffusion of Na ions from the glass substrate, confirmed by nanoindentation tests on TiO2 films deposited on fused quartz.
References
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Journal ArticleDOI
An improved technique for determining hardness and elastic modulus using load and displacement sensing indentation experiments
Warren C. Oliver,George M. Pharr +1 more
TL;DR: In this paper, the authors used a Berkovich indenter to determine hardness and elastic modulus from indentation load-displacement data, and showed that the curve of the curve is not linear, even in the initial stages of the unloading process.
Journal ArticleDOI
Characterization of diamond films by Raman spectroscopy
Diane S. Knight,William B. White +1 more
TL;DR: The Raman spectrum of hexagonal diamond (lonsdaleite) is distinct from that of the cubic diamond and allows it to be recognized as discussed by the authors, and the Raman line width varies with mode of preparation of the diamond and has been related to degree of structural order.
Journal ArticleDOI
The Effect of Cold‐Work Distortion on X‐Ray Patterns
B. E. Warren,B. L. Averbach +1 more
TL;DR: In this article, a cosine Fourier series and a set of An coefficients determined by measuring several orders of a given plane is used to obtain a distribution function of the strains directly from a Fourier transform of the An coefficients.
Journal ArticleDOI
A negative surface energy for alumina
TL;DR: New experimental evidence based on infrared spectroscopy, in conjunction with X-ray diffraction and surface-area measurements, is presented that θ-alumina has indeed very stable surface OH groups at high temperatures, and that this form of alumina does not sinter even at temperatures up to 1,300 K.
Journal ArticleDOI
The effects of Si incorporation on the electrochemical and nanomechanical properties of DLC thin films
TL;DR: In this article, the influence of Si addition on the bonding structure, nanomechanical and corrosion behaviour of the diamond-like carbon (DLC) films was investigated by Raman and X-ray photoelectron (XPS) spectroscopy,nano-indentation, potentiodynamic and electrochemical impedance spectrography (EIS).
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