Self-healing materials for space applications overview of
· Self-healing in Al2O3/SiC composites. (a) Oxygen penetrates cracked surfaces and oxidizes SiC to SiO2. (b) Al2O3 and MxOy dissolve into SiO2 to form a melt which fills gaps. (c) Mechanically strong crystals nucleate and grow in the supercooled melt
Get Price
Japanese Journal of Applied Physics Volume 60 Number SB
This C–C bond on the C-face can be removed by the incorporation of an additional NO molecule. For the resultant interface structures no localized electronic states are generated around the energy gap of 4H-SiC suggesting that the NO annealing process is crucial to reduce the carbon-related defects at the 4H-SiC/SiO 2 interface.
Get Price
High-performance microwave absorption properties of Ti 3
· The Ti3SiC2/Al2O3 coatings were prepared by plasma spraying process for the microwave absorption application. The coatings showed a dense structure with a few pores and unmelted region and the Ti3SiC2 distributes uniformly in the coatings. The XRD was used to identify the phase composition of the coatings. The results indicated that the as-sprayed Ti3SiC2/Al2O3 coatings were
Get Price
(PDF) Performance analysis of a parabolic trough solar
The performance of the PTCs using nanofluid as HTF is studied. A three-dimensional optic-thermal-stress coupling model is established. The coupled characteristics of thermal and mechanical of the receiver are revealed. a b s t r a c t Nanofluid with
Get Price
Processing of MAX phases From synthesis to applications
Ti 3 SiC 2 composites containing 30 vol of SiC particles or 30 vol of TiC particles were sintered by HIP at temperatures up to 1600°C modifying the amounts of TiH 2 α-SiC and graphite. 162 Similar strategy was used by Tian et al 202 where Ti Si and TiC were used as starting powders to synthesize Ti 3 SiC 2 using SPS at 1400°C as well
Get Price
Improvement Lifetime of Trough Cover by Using Al2O3
· Refractories used on trough cover must possess good corrosion resistance and thermal shock resistance at ℃ service condition. The lifetime of high-alumina castables is about 20 days in main trough of China Steel Co. In this study Al2O3-SiC-C castables were proposed by replacing high-alumina castables. It showed that the modulus
Get Price
Exergy analysis of parabolic trough solar collectors using
· No wind condition (15) Nu L = (Nu l) m (Nu t) m 1 / m Nu T = G C L ¯ Ra 1 / 4 Nu t = C t ¯ Ra L 1 / 3 (16) Nu l = C 2 l n (1 C 2 / Nu T) The constant parameters in the above equations are given by G = 0.735 C 2 = 1.3 C t ¯ P r = 0.71 = 0.087 m = 4.5
Get Price
Industrial Engineering Chemistry Research Vol 35 No 12
The diffusivity of carbon dioxide in the melt was found to be a strong function of pressure but not of moisture content in the range of 34.5−39 (w/w) studied. This diffusivity value decreased from 7.5 10-10 to 0.9 10-10 m2/s as pressure was increased from atmospheric to 115 bar.
Get Price
PERFORMANCE ANALYSIS OF PARABOLIC TROUGH SOLAR
performance analysis of parabolic trough solar collector for three different flow rates
Get Price
Efficient Thermal Transport Highway Construction Within
· Al2O3 green bodies were first formed by gelcasting. After being degreased at 600 °C the green bodies were sintered at different temps. from 1200 °C to 1500 °C and porous Al2O3 ceramic skeletons with different porosity were resulted. The porosity was readily controlled by the sintering temp.
Get Price
Packaging for ElectronicsFraunhofer
Using new materials for bond wires like copper composites or alloys we aim for improvement of the application s lifetime. Furthermore by bonding parameters geometry material and others we cover every power electronics application. For best bondability we also benefit from using metallization and surface optimization of semiconductors.
Get Price
International Journal of Climatology Vol 41 No S1
· The climatology of summer (JJA) mean (a) vertically integrated water vapour fluxes (units kg m −1 s −1) and (b) stream lines at 850-hPa during 1960–2015. Areas above 3 000 m (above sea level) are shaded in grey. (c) Spatial pattern of the first EOF mode of
Get PriceEfficient Thermal Transport Highway Construction Within
· Al2O3 green bodies were first formed by gelcasting. After being degreased at 600 °C the green bodies were sintered at different temps. from 1200 °C to 1500 °C and porous Al2O3 ceramic skeletons with different porosity were resulted. The porosity was readily controlled by the sintering temp.
Get PriceVolume-8 Issue-12 International Journal of Innovative
· Design and Fabrication of Three-Way Catalytic Converter by using Al2O3 and SiO2 Coating as aCatalyst and Access of Emission Characteristics in C.I. Engine 202. Authors S. Gejendhiran S. Vignesh M. Kalaimani S. Arokia Anicia Paper Title
Get PriceInfluences of novel Si2BC3N antioxidant on the structure
· Refractories under load is another criterion for evaluating the service performances of Al 2 O 3-SiC-C castables when they were subjected to the long-term iron taping under high temperature. The deformation vs temperature curves of Al 2 O 3-SiC-C castables were recorded and shown in Fig. 12. Based on the curves it can be seen that the maximum dilatation and temperature at maximum
Get Price
(PDF) Experimental and simulated performance of hot mirror
Researchers have investigated using Nano fluids to enhance the heat transfer with suspended nanoparticles. The most used nanofluids contain the following nano particles Al Fe2O3 Al2O3 Cu TiO2 and SiO2 13 14 . The main use of the nanofluids is to increase the thermal conductivity of
Get Price
Multi-objective optimization of solar collector using
· This study looks at the effects of different kinds of nanoparticles including AL2O3 SiO2 and CuO on the design of a solar flat plate collector in different volumetric concentrations. Water was used as the base fluid and optimal SFPC parameters were obtained for each of the nanofluids. Both the efficiency and total annual cost were selected as objective functions and the optimum Pareto
Get Price
International Journal of Climatology Vol 41 No S1
· The climatology of summer (JJA) mean (a) vertically integrated water vapour fluxes (units kg m −1 s −1) and (b) stream lines at 850-hPa during 1960–2015. Areas above 3 000 m (above sea level) are shaded in grey. (c) Spatial pattern of the first EOF mode of
Get Price
High-performance microwave absorption properties of Ti 3
· The Ti3SiC2/Al2O3 coatings were prepared by plasma spraying process for the microwave absorption application. The coatings showed a dense structure with a few pores and unmelted region and the Ti3SiC2 distributes uniformly in the coatings. The XRD was used to identify the phase composition of the coatings. The results indicated that the as-sprayed Ti3SiC2/Al2O3 coatings were
Get Price
Volume-8 Issue-12 International Journal of Innovative
· Design and Fabrication of Three-Way Catalytic Converter by using Al2O3 and SiO2 Coating as aCatalyst and Access of Emission Characteristics in C.I. Engine 202. Authors S. Gejendhiran S. Vignesh M. Kalaimani S. Arokia Anicia Paper Title
Get Price
Enhancement Techniques of Parabolic Trough Collectors A
Sokhansefat T Kasaeian A Kowsary F (2015) Heat transfer enhancement in PTC tube using Al2O3/synthetic oil nanofluid. Renewable and Sustainable Energy Reviews 33 . Mwesigye A Huan Z Meyer JP (2015) Thermodynamic optimisation of the performance of a parabolic trough receiver using synthetic oil-Al2O3 nanofluid. Applied Energy 156 398
Get Price
High-performance microwave absorption properties of Ti 3
· The results indicated that the as-sprayed Ti3SiC2/Al2O3 coatings were composed of α-Al2O3 and γ-Al2O3 Ti3SiC2 TiC and Ti5Si3. The TiC and Ti5Si3 phases resulted from the Ti3SiC2 decomposition during the plasma spraying process. The complex permittivity of Ti3SiC2/Al2O3 coatings enhanced significantly with increasing the Ti3SiC2 content.
Get PriceJapanese Journal of Applied Physics Volume 60 Number SB
In this work we investigated the influence of the Mg/Sn supply ratio into Mg 2 Sn thin film deposited on Al 2 O 3 (0001) (sapphire c-plane) substrate using molecular beam epitaxy (MBE) as well as the effect of incorporating Ge. We demonstrated that a low ratio of Sn to Mg improved the thin film s quality while the incorporation of Ge atoms (into the Sn sites) resulted in superior thermoelectrical properties (p-type).
Get Price
Japanese Journal of Applied Physics Volume 33 Part 1
The complex dielectric functions of 6H–SiC for light polarized perpendicular and parallel to the optic axis c were measured using spectroscopic ellipsometry. The measurements were made on the (0001) and (01 0) surfaces of 6H–SiC in the photon energy range between 1.2 and 5.4 eV at room temperature. The measured dielectric-function spectra
Get Price
Maskless random antireflective nanotexturing of single
· Random nanotexturing of optics and semiconductors has proven to be a highly effective way to produce high transmittivity low reflective surfaces. Here the authors report a one-step technique using SF6 reactive ion etching to produce nanotexturing of SiC. The effect of etching process power and
Get Price
Volume-8 Issue-12 International Journal of Innovative
· Design and Fabrication of Three-Way Catalytic Converter by using Al2O3 and SiO2 Coating as aCatalyst and Access of Emission Characteristics in C.I. Engine 202. Authors S. Gejendhiran S. Vignesh M. Kalaimani S. Arokia Anicia Paper Title
Get Price
Performance analysis of a parabolic trough solar collector
· Compared with the PTCs using synthetic oil the collector efficiencies of the PTC systems using Al 2 O 3 /synthetic oil nanofluid are higher moreover the changes of temperature in the absorber with the direct normal irradiance (DNI) the inlet temperature and the inlet velocity are remarkable reduced. This work provides a fundamental reference to the application of nanofluid in the PTC system.
Get PriceIndustrial Engineering Chemistry Research Vol 46 No 26
Industrial Engineering Chemistry Research 2007 46 26 (Article) Publication Date (Web) November 28 2007. Abstract. Full text. PDF. ABSTRACT. The impact of CO2 cofeed (0−50 by volume) on steam gasification of biomass was investigated via
Get Price
Chemistry of Materials Vol 32 No 11
· Chemistry of Materials 2020 32 11 (Article) Publication Date (Web) May 12 2020. Abstract. Full text. PDF. ABSTRACT. High oxygen ion conductivity of solid electrolytes is a crucial prerequisite for the efficiency of electrochemical devices such
Get Price
