{"currentpage":1,"firstResult":0,"maxresult":10,"pagecode":5,"pageindex":{"endPagecode":5,"startPagecode":1},"records":[{"abstractinfo":"Nanocrystallization. an alternative method for improving the high-temperature oxidation resistance of alloys by increasing the supply of the protective oxide-forming element such as Cr or Al has received considerable attention. However, for nanocrystalline (NC) alloy containing two phases, the effect of spatial distribution uniformly of the oxide-forming element oil oxidation has not been studied. In this contribution. three compositionally similar Cu-Ni-Cr NC alloys. with corresponding Cr distribution in atomic, nano-, and micrometer length scale, have been specifically designed and fabricated using direct current magnetron sputtering (DCMS), nanocomposite electrodeposition (NCE). and surface mechanical attrition treatment (SMAT). respectively These NC alloys. In Comparison to the conventional coarse-grained alloy counterpart during oxidation in air in 800 degrees C, exhibited dramatically increased ability to develop a continuous chromia scale, causing, a considerable decrease in the oxidation kinetics. The change in oxidation behavior is associated not only with the small grain size of the alloys. bit( also with the refined distribution of the Cr-rich phases. Among the three methods, microstructures developed by DCMS and NCE were more effective than that front SMAT. The formation of these processing-dependent microstructures and their relationship with the Cr-selective oxidation process are discussed. (C) 2008 The Electrochemical Society. [DOI: 10.1149/1.3049345] All rights reserved.","authors":[],"categoryName":"|","doi":"","fpage":"","id":"4b215a96-77eb-4f7e-8d4e-9843df8d3238","issue":"3","journal":{"abbrevTitle":"JOTES","id":"2ce1b26b-5314-4a39-8592-605366bf8b5e","issnPpub":"0013-4651","publisherId":"JOTES","title":"Journal of the Electrochemical Society"},"keywords":[{"id":"77653974-25fb-4c75-a680-a93559219116","keyword":"oxidation resistance;growth;coatings;nanocomposites;deposition;behavior","originalKeyword":"oxidation resistance;growth;coatings;nanocomposites;deposition;behavior"}],"language":"en","publisherId":"0013-4651_2009_3_1","title":"Effect of Alloy Nanocrystallization and Cr Distribution on the Development of a Chromia Scale","volume":"156","year":"2009"},{"abstractinfo":"NiCrAlY coatings are commonly used to improve the oxidation resistance of gas turbine blade. In this research, the cyclic oxidation behavior at 1000 degrees C of NiCrAlY coatings with and without Re addition was investigated. XRD was used to identify the oxide phases formed oil the coatings. The microstructural changes in the coatings during oxidation were examined by SEM, EDX and EPMA. The results indicate that the addition of Re decreases the oxidation rate of NiCrAlY coatings. After long-term oxidation, some less protective oxides (such as NiCr2O4 and NiAl2O4) were observed on the surface of the NiCrAlY coatings, while the scale formed on the NiCrAlYRe coatings was still composed of protective alpha-Al2O3. Therefore, it is concluded that the addition of Re clearly improves the oxidation resistance of NiCrAlY coatings in cyclic oxidation conditions. (c) 2006 Published by Elsevier B.V.","authors":[],"categoryName":"|","doi":"","fpage":"1421","id":"8317fa36-5c08-43a2-8117-37e79b98f344","issue":"42798","journal":{"abbrevTitle":"S&CT","id":"dcdd8961-efc5-4044-81d0-2ea320551b72","issnPpub":"0257-8972","publisherId":"S&CT","title":"Surface & Coatings Technology"},"keywords":[{"id":"73b377a0-4962-4609-a55d-b90285fd93f1","keyword":"coating;rhenium;oxidation;microstructure;NiCrAlY;nickel","originalKeyword":"coating;rhenium;oxidation;microstructure;NiCrAlY;nickel"}],"language":"en","publisherId":"0257-8972_2006_42798_3","title":"Improvement of the oxidation resistance of NiCrAlY coatings by the addition of rhenium","volume":"201","year":"2006"},{"abstractinfo":"In order to improve the oxidation resistance of NiCrAlY coatings, Al2O3 second phase was incorporated into NiCrAlY coatings obtained by plasma-laser technique. After laser remelting, the Al2O3 second phase was distributed in the grains as well as on the grain boundaries of the coatings. The Al2O3 second phase could improve the oxidation resistance of NiCrAlY coatings during oxidation at 1000 degreesC. (C) 2002 Elsevier Science B.V. All rights reserved.","authors":[],"categoryName":"|","doi":"","fpage":"2404","id":"a4f0fe1d-e7d5-4fb1-af87-39621a38564c","issue":"16-17","journal":{"abbrevTitle":"ML","id":"90b15a58-51fc-41ad-8509-c2692f6a3f6e","issnPpub":"0167-577X","publisherId":"ML","title":"Materials Letters"},"keywords":[{"id":"b6aa75b7-e3cf-425e-b988-c056c5c97b51","keyword":"Al2O3;NiCrAlY;plasma-laser technique;oxidation resistance;thermal-barrier coatings;mcraly coatings;behavior;alloy;superalloy","originalKeyword":"Al2O3;NiCrAlY;plasma-laser technique;oxidation resistance;thermal-barrier coatings;mcraly coatings;behavior;alloy;superalloy"}],"language":"en","publisherId":"0167-577X_2003_16-17_1","title":"Improved oxidation resistance of NiCrAlY coatings","volume":"57","year":"2003"},{"abstractinfo":"Micro-crystalline beta -FeAl+Zr coatings on cast beta -FeAl and 304S stainless steel substrates were produced with unbalanced magnetron sputter deposition technique. Isothermal oxidation in pure O-2 and a cyclic oxidation test in ambient air at 1000 degreesC were carried out to assess the oxidation resistance of the coatings. The spallation resistance of the oxide scale formed on the coatings was superior compared with the uncoated alloys. After the oxidation in O-2, large voids at the cast FeAl/oxide interface were observed; while no obvious voids were found at the coating/oxide interface. Outward Al diffusion and S interfacial segregation were considered as the reasons for the formation of the voids. Recrystallization and grain growth of the coating was believed to play an important role in improving the spallation resistance. The chemical compatability of the coating with 304S stainless steer substrate was also discussed.","authors":[],"categoryName":"|","doi":"","fpage":"419","id":"b4726d97-383a-4ae8-b2ba-743ac229ead3","issue":"6","journal":{"abbrevTitle":"HTMAP","id":"8c150755-1cd7-4138-99f9-977ab79fd688","issnPpub":"0334-6455","publisherId":"HTMAP","title":"High Temperature Materials and Processes"},"keywords":[{"id":"fa4c7457-9fb8-41f7-82e4-ce07fc3f4a45","keyword":"beta-FeAl plus Zr coating;unbalanced magnetron sputter deposition;oxidation;iron aluminides;al alloys;behavior;segregation;adherence;sulfur;scales","originalKeyword":"beta-FeAl plus Zr coating;unbalanced magnetron sputter deposition;oxidation;iron aluminides;al alloys;behavior;segregation;adherence;sulfur;scales"}],"language":"en","publisherId":"0334-6455_2000_6_1","title":"Oxidation resistance of magnetron sputter deposited beta-FeAl+Zr coatings","volume":"19","year":"2000"},{"abstractinfo":"The discontinuous and cyclic oxidation behavior of TiAlNb intermetallics with coatings such as NiCrAlY, TiAlCr and ultrafine enamel coatings at 800 C was studied. The results indicated that the three coatings could decrease the mass gains of TiAlNb alloys during discontinuous and cyclic oxidation at 800 C. However, heavy interdiffusion occurred at the interface of NiCrAIY/TiAlNb during oxidation. Some discontinuous Al2O3 scales formed at interface of NiCrAIY/TiAlNb, where interdiffusion might be depressed. A protective Al2O3 scale could form on TiAlCr coating during oxidation at 800 C; however, the outward diffusion of Nb and inward diffusion of Cr through the interface and the formation of Al-depletion zone at the subsurface might be detrimental to the long-term oxidation resistance of coating. Enamel coating kept intact during oxidation at 800 C. But the thermodynamic instability of enamel in contact with TiAl alloys resulted in the formation of an Al-depletion zone and TiSiO3 layer at the interface of enamel/TiAlNb, which would be harmful to the adherence of the enamel coating to the substrate. (c) 2004 Published by Elsevier B.V.","authors":[],"categoryName":"|","doi":"","fpage":"322","id":"02b254c7-32c4-4082-a141-6dbcf08d87b1","issue":"42769","journal":{"abbrevTitle":"S&CT","id":"dcdd8961-efc5-4044-81d0-2ea320551b72","issnPpub":"0257-8972","publisherId":"S&CT","title":"Surface & Coatings Technology"},"keywords":[{"id":"a4c1ff06-82f4-4ff7-a727-7bf5fa31a4a1","keyword":"TiAlNb intermetallics;discontinuous and cyclic oxidation;coatings;tial-based intermetallics;high-temperature air;titanium aluminides;nb;addition;ti60 alloy;resistance;corrosion","originalKeyword":"TiAlNb intermetallics;discontinuous and cyclic oxidation;coatings;tial-based intermetallics;high-temperature air;titanium aluminides;nb;addition;ti60 alloy;resistance;corrosion"}],"language":"en","publisherId":"0257-8972_2005_42769_2","title":"The oxidation behavior of TiAINb intermetallics with coatings at 800 C","volume":"197","year":"2005"},{"abstractinfo":"The properties of two different types of thermal barrier coatings (TBCs) were compared to improve the surface characteristics on high temperature components. These TBCs consisted of a duplex TBC and a five-layered functionally graded TBC. NiCrAlY bond coats were deposited on a number of Inconel-738LC specimens using high velocity oxy-fuel spraying (HVOF) technique. For duplex coating, a group of these specimens were coated with yttria stabilized zirconia (YSZ) using plasma spray technique. Functionally graded NiCrAlY/YSZ coatings were fabricated by plasma spray using co-injection of the two different powders in a single plasma torch. The amount of zirconia in functionally graded coatings were gradually increased from 30 to 100 vol. pct. Microstructural changes, thermally grown oxide (TGO) layer growth and damage initiation of the coatings were investigated as a function of isothermal oxidation test at 970°C. As a complementary test, the performance of the fabricated coatings by the optimum processing conditions was evaluated as a function of intense thermal cycling test at 1100°C. Also the strength of the adhesive coatings of the substrate was also measured. Microstructural characterization was analyzed by scanning electron microscopy (SEM) and optical microscopy whereas phase analysis and chemical composition changes of the coatings and oxides formed during the tests were studied by XRD (X-ray diffraction) and EDS (energy dispersive spectrometer). The results showed that microstructure and compositions gradually varied in the functionally graded coatings. By comparison of duplex and functionally graded TBCs oxidation behavior (duplex failure after 1700 h and funcitionally graded TECs failure after 2000 h), thermal shock test and adhesion strength of the coatings, the functionally graded TBC had better performance and more durability.","authors":[{"authorName":"B. Saeedi","id":"c13e1276-20a8-4312-a566-5ccab373dd94","originalAuthorName":"B. Saeedi"}],"categoryName":"|","doi":"","fpage":"499","id":"b25b42fd-c8f6-4cae-b29f-01cea0ff1ad3","issue":"4","journal":{"abbrevTitle":"CLKXJSY","coverImgSrc":"journal/img/cover/JMST.jpg","id":"11","issnPpub":"1005-0302 ","publisherId":"CLKXJSY","title":"材料科学技术(英文)"},"keywords":[{"id":"1dbeadef-ecd7-436f-bc34-a1cb74292131","keyword":"Thermal barrier coatings (TBCs)","originalKeyword":"Thermal barrier coatings (TBCs)"}],"language":"en","publisherId":"1005-0302_2009_4_22","title":"Influence of the Thermal Barrier Coatings Design on the Oxidation Behavior","volume":"25","year":"2009"},{"abstractinfo":"A graded NiCrAlYRe coating was prepared by combining arc ion plating (AIP) with chemical vapor deposition (CVD) aluminizing. Quasi-isothermal oxidation tests of the graded NiCrAlYRe coating and the conventional NiCrAlYRe coating were performed in air at 900, 1000 and 1100 A degrees C for up to 1000, 1000 and 200 h, respectively. The results showed that the graded NiCrAlYRe coating exhibited better long time oxidation resistance than the conventional NiCrAlRe coating. This favorable oxidation behavior was attributed to the rapid formation of a protective alpha-Al(2)O(3) scale and a sufficient Al reservoir. The structures and morphologies of oxide scales varied under different oxidation conditions. theta-Al(2)O(3) was observed on both coatings during oxidation at 900 A degrees C, however, the graded coating showed more favorable conditions for theta-Al(2)O(3) to grow than the conventional coating. For the graded coating, phase transformation from theta-Al(2)O(3) to alpha-Al(2)O(3) resulted in a sharp decrease in the parabolic rate constant k(p) between 900 and 1,000 A degrees C.","authors":[],"categoryName":"|","doi":"","fpage":"125","id":"c852a9fe-ba25-481c-978c-fbabda788f33","issue":"42798","journal":{"abbrevTitle":"OOM","id":"06d242a2-687a-46a7-b481-ee5d30cf690c","issnPpub":"0030-770X","publisherId":"OOM","title":"Oxidation of Metals"},"keywords":[{"id":"7d6cdc8d-98c6-4236-be21-1ca10c1d65f3","keyword":"Rhenium;Oxidation;alpha-Al(2)O(3);theta-Al(2)O(3);Phase;transformation;cyclic-oxidation;alloys;rhenium;microstructure;implantation;improvement;resistance;additions;growth;scale","originalKeyword":"Rhenium;Oxidation;alpha-Al(2)O(3);theta-Al(2)O(3);Phase;transformation;cyclic-oxidation;alloys;rhenium;microstructure;implantation;improvement;resistance;additions;growth;scale"}],"language":"en","publisherId":"0030-770X_2009_42798_2","title":"Oxidation Behavior of Graded NiCrAlYRe Coatings at 900, 1000 and 1100 A degrees C","volume":"71","year":"2009"},{"abstractinfo":"The behaviours of Al2O3, aluminide, CoCrAlY and TiAlCr coatings on the cyclic oxidation resistance of a TiAl alloy were investigated. Al2O3 coating exhibited limited improvement of the cyclic oxidation of TiAl due to spallation. Aluminide and CoCrAlY coatings remarkably improved the cyclic oxidation kinetics of TiAl due to the formation of adherent Al2O3 scales, but the two coatings exhibited a poor coating-substrate compatibility, especially cracks occurred in two coatings after cyclic oxidation. These coatings exhibited a poor substrate-coating compatibility in comparison with TiAlCr coating. (C) 1998 Published by Elsevier Science S.A. All rights reserved.","authors":[],"categoryName":"|","doi":"","fpage":"57","id":"82159bf7-d04c-4b55-9624-7c4a080c8848","issue":"42737","journal":{"abbrevTitle":"S&CT","id":"dcdd8961-efc5-4044-81d0-2ea320551b72","issnPpub":"0257-8972","publisherId":"S&CT","title":"Surface & Coatings Technology"},"keywords":[{"id":"280c4491-5920-4aaa-a8e9-35833c2b97ff","keyword":"coating-substrate compatibility;cyclic oxidation;protective coatings;TiAl intermetallics;high-temperature oxidation;gamma-titanium aluminides;compound;alloys;protection;film","originalKeyword":"coating-substrate compatibility;cyclic oxidation;protective coatings;TiAl intermetallics;high-temperature oxidation;gamma-titanium aluminides;compound;alloys;protection;film"}],"language":"en","publisherId":"0257-8972_1998_42737_2","title":"The effects of several coatings on cyclic oxidation resistance of TiAl intermetallics","volume":"110","year":"1998"},{"abstractinfo":"The effects of Co-30Cr-6Al-0.5Y and Ni-30Cr-6Al-0.5Y overlay coatings on oxidation resistance of TiAl intermetallics were studied at 900-1000 degrees C in static air. The TiAl alloys showed poor oxidation resistance due to the formation of mixed Al2O3 + TiO2 scale which is easily spalled off. CoCrAlY and NiCrAlY coatings could remarkably improve the oxidation resistance of TiAl owing to the formation of protective Al2O3 scale. Due to the inward diffusion of Co and Ni to the substrate, two brittle and hard diffusion layers formed between the CoCrAlY and NiCrAlY coatings and the substrate. TiO, appeared on both of CoCrAlY and NiCrAlY coatings, which may result in the acceleration of the oxidation rate at 1000 degrees C. (C) 1998 Elsevier Science S.A.","authors":[],"categoryName":"|","doi":"","fpage":"248","id":"7f73d530-5447-46c9-ab83-f7fe7eb9c12c","issue":"3","journal":{"abbrevTitle":"S&CT","id":"dcdd8961-efc5-4044-81d0-2ea320551b72","issnPpub":"0257-8972","publisherId":"S&CT","title":"Surface & Coatings Technology"},"keywords":[{"id":"1b736c97-91e8-4bf9-aa70-281a24892c0f","keyword":"interdiffusion;MCrAlY coating;oxidation;TiAl intermetallics","originalKeyword":"interdiffusion;MCrAlY coating;oxidation;TiAl intermetallics"}],"language":"en","publisherId":"0257-8972_1998_3_1","title":"Effect of MCrAlY overlay coatings on oxidation resistance of TiAl intermetallics","volume":"99","year":"1998"},{"abstractinfo":"NiCrAlY coatings with and without CrN or CrON interlayer as diffusion barrier were deposited on superalloy DSM11 by arc ion plating (AIP). The oxidation performance of the coating systems was evaluated by isothermal oxidation tests at 1100 C for 100 h. The element interdiffusion and oxidation behavior of the coating systems were described. It was found that the NiCrAlY coatings provided protective effect for the DSM11 substrate. However, serious interdiffusion between the coatings and substrate resulted in rapid degradation of the coatings. The addition of CrN or CrON interlayer between the coatings and substrate markedly decreased the interdiffusion. CrON interlayer performed better than CrN interlayer, which was attributed to the excellent diffusion barrier ability of Al2O3 layer formed in the interlayer at high temperature. Also, the NiCrAlY/CrON coating system exhibited more effective protection for DSM11 than the NiCrAlY/CrN coating system.","authors":[],"categoryName":"|","doi":"","fpage":"341","id":"88cdd7b5-8a4e-40c2-b7c6-f7c33aff3be3","issue":"2","journal":{"abbrevTitle":"JOMR","id":"155c387a-c8cb-4083-85f3-6b58aeef4116","issnPpub":"0884-2914","publisherId":"JOMR","title":"Journal of Materials Research"},"keywords":[{"id":"997b498e-f7ac-494d-b27c-1c680f355518","keyword":"high-temperature oxidation;hot-corrosion behavior;gas-turbine blades;diffusion barrier;nicocraly coatings;interdiffusion;deposition;design;films;superalloy","originalKeyword":"high-temperature oxidation;hot-corrosion behavior;gas-turbine blades;diffusion barrier;nicocraly coatings;interdiffusion;deposition;design;films;superalloy"}],"language":"en","publisherId":"0884-2914_2008_2_1","title":"Improvement of oxidation-resistance of NiCrAlY coatings by application of CrN or CrON interlayer","volume":"23","year":"2008"}],"totalpage":730,"totalrecord":7295}