Готові списки джерел за темами / Niobium-Silicide Based Alloys

Добірка наукової літератури з теми "Niobium-Silicide Based Alloys"

Автор: Grafiati

Опубліковано: 10 грудня 2022

Оновлено: 28 січня 2023

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Статті в журналах з теми "Niobium-Silicide Based Alloys"

Qu, Shi Yu, Ya Fang Han, and Liguo Song. "Microstructures and Properties of Refractory Niobium-Silicide-Based Composites." Materials Science Forum 475-479 (January 2005): 737–40. http://dx.doi.org/10.4028/www.scientific.net/msf.475-479.737.

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The microstructures, mechanical properties and oxidation resistance of the refractory Nb-silicide-based composites have been investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), compression tests and high-temperature oxidation experiments. The results showed that 1773K/100h heat-treatment was an optimum processing for acquiring equilibrium Nb solid solution and silicides microstructure. In the binary Nb-Si system, the microstructure consisted of continuous Nb5Si3 equilibrium matrix and dispersed Nb particles, while in the the Nb-Ti-Cr-Al-Si-(Hf) multicomponent system, there are two typical microstructures, i.e., a two-phase structure of β (Nb solid solution)+D81 Nb5Si3-type silicide in the alloys with the Si+Al content (15at.% and 6at.%, respectively), and a three-phase structure of β+D81 Nb5Si3-type + D88 Ti5Si3-type silicides in the alloys with lower Si+Al content (10at.% and 8at.%, respectively). The results of compression tests showed that all alloys display high strength at both room and high temperatures, only a slight decrease in compression properties occured for Nb-Ti-Cr-Al-Si alloys, comparing to the binary Nb-Si in-situ composites. This type of alloys possesses good high temperature strengths up to at least 1473K. The results of high-temperature oxidation experiments showed that the oxidation rates of the alloys with Ti, Cr, Al and Hf addition were at least one order of magnitude lower than those of the Nb-Si binary alloys.

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Drawin, Stefan, J. P. Monchoux, J. L. Raviart, and Alain Couret. "Microstructural Properties of Nb-Si Based Alloys Manufactured by Powder Metallurgy." Advanced Materials Research 278 (July 2011): 533–38. http://dx.doi.org/10.4028/www.scientific.net/amr.278.533.

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An NbTiHfCrAlSi niobium silicide based atomized powder has been compacted by a conventional technique (hot extrusion) and by spark plasma sintering to nearly fully dense alloys. Both materials exhibit a metastable fine micrometer-sized microstructure that has been coarsened by a subsequent heat treatment. The densification of the SPS sample takes place between ca. 800°C and 1300°C.

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Tsakiropoulos, P. "On the macrosegregation of silicon in niobium silicide based alloys." Intermetallics 55 (December 2014): 95–101. http://dx.doi.org/10.1016/j.intermet.2014.07.004.

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Allen, A., A. C. Douglas, L. M. Feitosa, H. Qian, J. Li, H. B. Dong, X. Lin, and Y. Li. "Solidification of niobium-silicide-based alloys during laser additive manufacturing process." IOP Conference Series: Materials Science and Engineering 529 (May 29, 2019): 012006. http://dx.doi.org/10.1088/1757-899x/529/1/012006.

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Dicks, Robert, Fude Wang, and Xinhua Wu. "The manufacture of a niobium/niobium-silicide-based alloy using direct laser fabrication." Journal of Materials Processing Technology 209, no. 4 (February 2009): 1752–57. http://dx.doi.org/10.1016/j.jmatprotec.2008.04.042.

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Zhao, J. C., and J. H. Westbrook. "Ultrahigh-Temperature Materials for Jet Engines." MRS Bulletin 28, no. 9 (September 2003): 622–30. http://dx.doi.org/10.1557/mrs2003.189.

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Анотація:

AbstractThis introductory article provides the background for the September 2003 issue ofMRS Bulletinon Ultrahigh-Temperature Materials for Jet Engines. It covers the need for these materials, the history of their development, and current challenges driving continued research and development. The individual articles that follow review achievements in four different material classes (threein situcomposites—based on molybdenum silicide, niobium silicide, and silicon carbide, respectively—and high-melting-point platinum-group-metal alloys), as well as advances in coating systems developed both for oxidation protection and as thermal barriers. The articles serve as a benchmark to illustrate the progress made to date and the challenges ahead for ultrahigh-temperature jet-engine materials.

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Tyagi, Megha, B. Vishwanadh, Subir Kumar Ghosh, and R. Tewari. "Synthesis and Characterization of Silicide Coating on Niobium Alloy Produced Using Molten Salt Method." Materials Science Forum 830-831 (September 2015): 683–86. http://dx.doi.org/10.4028/www.scientific.net/msf.830-831.683.

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The main aim of the present work is to develop an oxidation resistant Nb-Si coating on Nb alloys. For this purpose electroless molten salt - method was used, where a selective reaction occurs between NaCl–KCl–NaF–Na2SiF6and the Si powder. Due to this reaction, oxidation resistant Nb-Si phases forms on the surface of substrate. This paper reports the thickness variation of Nb-Si coating as a function of deposition time. The surface morphology was studied by using scanning electron microscopy (SEM). The various Nb-Si based phases formed on the Nb substrate have been identified using X-ray diffraction (XRD) analysis, supplemented with energy dispersive X-ray spectroscopy results. Based on these results mechanism of silicide coating on Nb alloys has been discussed in detail.

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Vellios, Nikos, Paul Keating, and Panos Tsakiropoulos. "On the Microstructure and Properties of the Nb-23Ti-5Si-5Al-5Hf-5V-2Cr-2Sn (at.%) Silicide-Based Alloy—RM(Nb)IC." Metals 11, no. 11 (November 20, 2021): 1868. http://dx.doi.org/10.3390/met11111868.

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The microstructure, isothermal oxidation, and hardness of the Nb-23Ti-5Si-5Al-5Hf-5V-2Cr-2Sn alloy and the hardness and Young’s moduli of elasticity of its Nbss and Nb5Si3 were studied. The alloy was selected using the niobium intermetallic composite elaboration (NICE) alloy design methodology. There was macrosegregation of Ti and Si in the cast alloy. The Nbss, αNb5Si3, γNb5Si3, and HfO2 phases were present in the as-cast or heat-treated alloy plus TiN in the near-the-surface areas of the latter. The vol.% of Nbss was about 80%. There were Ti- and Ti-and-Hf-rich areas in the solid solution and the 5-3 silicide, respectively, and there was a lamellar microstructure of these two phases. The V partitioned to the Nbss, where the solubilities of Al, Cr, Hf, and V increased with increasing Ti concentration. At 700, 800, and 900 °C, the alloy did not suffer from catastrophic pest oxidation; it followed parabolic oxidation kinetics in the former two temperatures and linear oxidation kinetics in the latter, where its mass change was the lowest compared with other Sn-containing alloys. An Sn-rich layer formed in the interface between the scale and the substrate, which consisted of the Nb3Sn and Nb6Sn5 compounds at 900 °C. The latter compound was not contaminated with oxygen. Both the Nbss and Nb5Si3 were contaminated with oxygen, with the former contaminated more severely than the latter. The bulk of the alloy was also contaminated with oxygen. The alloying of the Nbss with Sn increased its elastic modulus compared with Sn-free solid solutions. The hardness of the alloy, its Nbss, and its specific room temperature strength compared favourably with many refractory metal-complex-concentrated alloys (RCCAs). The agreement of the predictions of NICE with the experimental results was satisfactory.

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Bewlay, B. P., and J. A. Sutliff. "Microstructure and Microtexture in Nb-Silicide Based Composites." Microscopy and Microanalysis 4, S2 (July 1998): 278–79. http://dx.doi.org/10.1017/s1431927600021516.

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Анотація:

Directionally solidified in-situ composites based on niobium and niobium silicides, such as Nb5Si3 and Nb3Si, are presently under investigation as structural materials [1, 2], Alloying additions of elements such as Hf, Ti and Mo to these silicides are also being explored in order to increase strength and oxidation resistance. The present paper describes the effect of Hf, Mo and Ti additions on microstructure and microtexture of high temperature silcide-based in-situ composites.Alloys were prepared from high purity elements (>99.9%) using induction levitation melting in a segmented water-cooled copper crucible. The alloys were directionally solidified using the Czochralski method [2], Phase identification was performed using scanning electron microscopy, electron microprobe analysis (EMPA), and automated electron back scattering pattern (EBSP) analysis. Using EBSP, positive phase identification was accomplished by direct comparison of the location and character of the diffraction bands in the experimental pattern with those calculated from simulated patterns generated using the possible structure types.

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GUO, XIPING, HAISHENG GUO, CHENGFANG YAO, and PING GUAN. "INTEGRALLY DIRECTIONALLY SOLIDIFIED MICROSTRUCTURE OF AN NIOBIUM SILICIDE BASED ULTRAHIGH TEMPERATURE ALLOY." International Journal of Modern Physics B 23, no. 06n07 (March 20, 2009): 1093–98. http://dx.doi.org/10.1142/s0217979209060518.

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Integrally directional solidification of an advanced Nb silicide based ultrahigh temperature alloy was conducted with the use of special ceramic crucibles. The melt temperature was 2000°C and the withdrawing rate was respectively 5, 10, 15, 30, 50, 80 and 100 µm/s. The directionally solidified microstructure was composed of primary ( Nb ,X)5 Si 3 rods and ( Nb , Ti ) ss + ( Nb ,X)5 Si 3 eutectic colonies (here X represents Ti and Hf elements) that distributed evenly and aligned erectly along the growth direction. The quenched solid/liquid (S/L) interfaces had the morphology of a series of protruded parallel eutectic cells along the growth direction. ( Nb , Ti ) ss and ( Nb ,X)5 Si 3 slices grew in a coupled manner in each eutectic cell, forming a typical lamellar eutectic morphology. Both the average diameter of eutectic cells and lamellar spacing in them decreased with the increase of withdrawing rates. The solidification path was that primary ( Nb ,X)5 Si 3 rods formed firstly and then the retained liquid around solidified into ( Nb , Ti ) ss + ( Nb ,X)5 Si 3 eutectic cells.

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Більше джерел

Дисертації з теми "Niobium-Silicide Based Alloys"

Zelenitsas, Konstantinos. "Study of niobium silicide-based alloys for operational temperatures beyond 1150 °C." Thesis, University of Surrey, 2005. http://epubs.surrey.ac.uk/843199/.

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Анотація:

Niobium silicide-based in situ composites are Nb base alloys with high Si content that have the potential for higher temperature capability than the Ni-base superalloys. In microstructure-property studies of these alloys, the differentiation between the alphaNb5Si3 and beta5Si3 is usually not clear, even though it is essential to understanding the solidification of the alloys and the stability of their microstructures at high temperatures. In this work, the effects of Cr (5 or 8 at.%) A1 (5 or 4 at.%) and Ta (6 at.%) on the microstructures of as-cast and heat-treated Nb-24Ti-18Si in situ composites have been studied. The main phases observed in the as-cast and heat-treated (at 1400 °C /1500 °C for 100 h / 200 h) alloys were the niobium solid solution, (Nb,Ti)ss, the silicides, (Nb,Ti)3Si, alphaNb5Si3 and beta5Si3, and a Cr-rich C14 silicide Laves phase. In Nb-24Ti-18Si (KZ3) and Nb-24Ti-18Si-5Cr (KZ4), (Nb,Ti)ss was the primary phase, while in the Al-containing alloys, Nb-24Ti-18Si-5Al (KZ7), Nb-24Ti-18Si-5Cr-5Al (KZ5), Nb-24Ti-6Ta-18Si-5Cr-5Al (KZ6), Nb-24Ti-18Si-8Cr-4Al (KZ2) and Nb-24Ti-6Ta-18Si-8Cr-4Al (KZ8), beta5Si3 was the primary phase The as-cast microstructure of KZ3 consisted of primary (Nb,Ti)ss dendrites together with faceted (Nb,Ti)3Si and a rod-like eutectic of (Nb,Ti)ss and (Nb,Ti)3Si. The A1 addition changed the nature of the eutectic; an irregular eutectic of (Nb,Ti)ss and beta5Si3 was formed in the as-cast KZ7. The Cr stabilised the eutectic of (Nb,Ti)ss and beta5Si3 to lower temperatures and promoted the formation of Ti5Si3 in KZ8. In KZ2 and KZ8, the high Cr-content caused the formation of the Cr-rich C14 silicide Laves phase without destabilizing the beta5Si3. This Laves phase existed at the depressions of (Nb,Ti)ss dendrites and probably was formed congruently from the remaining liquid. This Laves phase with Si > 2.5 at.% can be classified as the ternary p-phase proposed by Goldschmidt and Brant, after considering that Si and A1 atoms substitute for Cr atoms and that Ti and Ta atoms substitute for Nb atoms. During heat-treatments, the beta5Si3 phase transformed to alphaNb5Si3 according to the precipitation reaction beta5Si3 → alphaNb5Si3 + (Nb,Ti)ss, which retarded by Ta and Cr. After heat-treatment, the Ta-containing alloys were homogenised to a lesser extent compared to non-Ta-containing alloys. The Ti5Si3 that formed during solidification in KZ8 was not eliminated after homogenization at 1400 °C for 100 h. Liquation was observed after 100 h at 1500 °C in KZ2 and KZ8, because of their high Cr-content. Thermo-gravimetric analysis was performed at 800 °C for the 100 h heat-treated alloys. "Pest oxidation" was observed in KZ3. The A1 and Cr additions suppressed this oxidation mechanism. Higher oxidation rates and lower adherence of the oxide scale were observed with increase of the Cr concentration and/or the Ta addition. The Cr-rich silicide Laves phase and Nb5Si3 silicides with very low oxygen contents existed in the oxide scales, indicating that the oxygen solubility in these phases is quite low and that they are not oxidised easily. The presence of the oxidation resistant Cr-rich C14 silicide Laves phase in the 1400 °C for 100 h heat-treated KZ2 and KZ8 did not affect the oxidation rate at 800 °C, but decreased the oxidation rate at 1200 °C.

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Dehoff, Ryan R. "Microstructure, Oxidation Behavior And Mechanical Behavior Of Lens Deposited Nb-Ti-Si And Nb-Ti-Si Based Alloys." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1221839511.

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Seemüller, Hans Christoph Maximilian [Verfasser], and M. [Akademischer Betreuer] Heilmaier. "Evaluation of Powder Metallurgical Processing Routes for Multi-Component Niobium Silicide-Based High-Temperature Alloys / Hans Christoph Maximilian Seemüller. Betreuer: M. Heilmaier." Karlsruhe : KIT-Bibliothek, 2016. http://d-nb.info/1100529713/34.

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Seemüller, Hans Christoph Maximilian [Verfasser], and Martin [Akademischer Betreuer] Heilmaier. "Evaluation of Powder Metallurgical Processing Routes for Multi-Component Niobium Silicide-Based High-Temperature Alloys / Hans Christoph Maximilian Seemüller. Betreuer: M. Heilmaier." Karlsruhe : KIT-Bibliothek, 2016. http://nbn-resolving.de/urn:nbn:de:swb:90-544644.

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Тези доповідей конференцій з теми "Niobium-Silicide Based Alloys"

Terentieva, V., O. Bogatchkova, and D. Cornu. "New Powdered Silicide Materials for Thermal Spraying Process and Coatings on the Niobium Base Alloys." In ITSC 1998, edited by Christian Coddet. ASM International, 1998. http://dx.doi.org/10.31399/asm.cp.itsc1998p1167.

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Анотація:

Abstract The given article presents some results of the scientific research devoted to the development of a new class of scale-resistant powder materials of the Si-Ti-Mo-B system for thermal spraying and using these materials for the creation of heat-resistant coatings on the niobium base alloys by means of various methods of thermal spraying. Also under consideration are problems relating to the theory and practice of obtaining reliable protective coatings on high-melting metals and their alloys, niobium ones included, intended for operation in high-enthalpy oxygen-containing gas flows. Hazard in commencing an oxidation reaction of the base material under coating is connected with density of open pores and cracks, and partial pressure of the oxidizer. Powdered multicomponent heterophase materials for gas-thermal spraying of protective coating with a self-healing ability and controlled properties are proposed. Finally the results of some properties of new silicide-type heterophase powders containing silicide and boride phases for a thermal spraying process and some properties of protective coating deposited on the niobium base alloys by means of a thermal spraying technique are presented.

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