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51.
干熄焦系统红焦装入线是自动化运行过程,各种单体设备运行是依靠各种指令和指令交换来实现自动控制的,对于从事干熄焦电气或初学者来说,如果不熟知干熄焦EI系统红焦装入线的各种指令及指令交换的过程,就很难判断自动模式下红焦装入线因指令错误造成的生产中断以及故障的原因,这种错误的指令常常能够自动消失或复位,在现场很难被捕捉到,因此本文将重点解析干熄焦系统红焦装入线上各单体设备的各种指令。 相似文献
52.
53.
采用等离子喷涂设备在钛合金表制备了CuAl/hBN涂层,对该涂层的显微结构、表面氧化及与钛合金的界面渗透性能进行了研究,结果发现:CuAl/hBN涂层呈典型的层状结构,各层间结合良好。涂层经800 ℃恒温氧化30 min后,表面从外到内分为Cu和CuO、CuO、CuO和Al2O3三层,涂层中的Cu、Al均向钛合金基体渗透,渗透深度约为5~10 μm,并在富Cu区域中形成了Ti-Cu合金。 相似文献
54.
J. Prasad RaoKurt E. Geckeler 《Progress in Polymer Science》2011,36(7):887-913
55.
Technical and Economical Aspects of Current Thermal Barrier Coating Systems for Gas Turbine Engines by Thermal Spray and EBPVD: A Review 总被引:4,自引:1,他引:3
Albert Feuerstein James Knapp Thomas Taylor Adil Ashary Ann Bolcavage Neil Hitchman 《Journal of Thermal Spray Technology》2008,17(2):199-213
The most advanced thermal barrier coating (TBC) systems for aircraft engine and power generation hot section components consist
of electron beam physical vapor deposition (EBPVD) applied yttria-stabilized zirconia and platinum modified diffusion aluminide
bond coating. Thermally sprayed ceramic and MCrAlY bond coatings, however, are still used extensively for combustors and power
generation blades and vanes. This article highlights the key features of plasma spray and HVOF, diffusion aluminizing, and
EBPVD coating processes. The coating characteristics of thermally sprayed MCrAlY bond coat as well as low density and dense
vertically cracked (DVC) Zircoat TBC are described. Essential features of a typical EBPVD TBC coating system, consisting of
a diffusion aluminide and a columnar TBC, are also presented. The major coating cost elements such as material, equipment
and processing are explained for the different technologies, with a performance and cost comparison given for selected examples. 相似文献
56.
Lanthanum hexaaluminate—a new material for atmospheric plasma spraying of advanced thermal barrier coatings 总被引:1,自引:0,他引:1
One of the main application fields of the thermal spraying process is thermal barrier coatings (TBCs). Today, partially stabilized
zirconia (YSZ or MSZ) is mainly used as a TBC material. At temperatures above 1000 °C, zirconia layers age distinctively,
including phenomena shrinkage and microcrack formation. Therefore, there is a considerable interest in TBCs for higher temperature
applications. In this paper, lanthanum hexaaluminate, a newly developed TBC material with long-term stability up to 1400 °C,
is presented. It ages significantly more slowly at these high temperatures than commercial zirconia-based TBCs. Its composition
favors the formation of platelets, which prevent a densification of the coating by postsintering. It consists of La2O3, Al2O3, and MgO. Its crystal structure corresponds to a magnetoplumbite phase. Lanthanum hexaaluminate powders were produced using
two different fabrication routes, one based on salts and the other one based on oxides. To optimize the granulate, various
raw materials and additives were tested. The slurry was spray dried in a laboratory spray drier and calcined at 1650 °C. Using
these two powders, coatings were produced by atmospheric plasma spraying (APS). The residual stresses of the coatings were
measured by the hole drilling method, and the deposition process was optimized with respect to the residual stresses in the
TBC. The coatings were extensively analyzed regarding phase composition, thermal expansion, and long-term stability, as well
as microstructural properties. 相似文献
57.
Development of refractory silicate-yttria-stabilized zirconia dual-layer thermal barrier coatings 总被引:1,自引:1,他引:0
Yirong He Kang N. Lee Surendra Tewari Robert A. Miller 《Journal of Thermal Spray Technology》2000,9(1):59-67
Development of advanced thermal barrier coatings (TBCs) is the most promising approach for increasing the efficiency and performance
of gas turbine engines by enhancing the temperature capability of hot section metallic components. Spallation of the yttria-stabilized
zirconia (YSZ) top coat, induced by the oxidation of the bond coat coupled with the thermal expansion mismatch strain, is
considered to be the ultimate failure mode for current state-of-the-art TBCs. Enhanced oxidation resistance of TBCs can be
achieved by reducing the oxygen conductance of TBCs below that of thermally grown oxide (TGO) alumina scale. One approach
is incorporating an oxygen barrier having an oxygen conductance lower than that of alumina scale. Mullite, rare earth silicates,
and glass ceramics have been selected as potential candidates for the oxygen barrier. This paper presents the results of cyclic
oxidation studies of oxygen barrier/YSZ dual-layer TBCs. 相似文献
58.
Nanostructured alumina (Al2O3) and nanostructured cermet coatings containing alumina dispersed in a FeCu or FeCuAl matrix, were deposited by atmospheric plasma spraying (APS) from nanostructured powders. These coatings were characterized by SEM, EDAX, TEM, XRD and nanoindentation. Friction and wear behaviour were investigated by sliding and abrasion tests. TEM and XRD revealed that a nanostructuring was retained in the APS deposited coatings.The nanostructured ceramic and cermet coatings were compared in terms of coefficient of friction and wear resistance. Nanostructured cermet coatings appeared to offer a better wear resistance under sliding and abrasion tests than nanostructured Al2O3 coatings. The role of Fe, Cu, and Al additions to the Al2O3 coatings on friction and wear behaviour, was investigated.In the case of FeCu- and FeCuAl-based cermet coatings containing alumina, though the starting material consist of only two compounds, the coatings contain up to four different phases after plasma spraying. The mechanical properties of these different phases namely crack sensitivity and elasto-plastic deformation was determined by nanoindentation. The failure mechanisms were investigated and an attempt was made to establish a ‘structure-property’ relationship. It was shown that an appropriate balance between hard and soft phases results in optimum tribological properties of the nanostructured cermet coatings. 相似文献
59.
《Ceramics International》2020,46(15):23417-23426
Yttria stabilized hafnia (Hf0.84Y0.16O1.92, YSH16) coatings were sprayed by atmospheric plasma spraying (APS). The effects of thermal aging at 1400 °C on the microstructures, mechanical properties and thermal conductivity of the coatings were studied. The results show that the as-sprayed coating was composed of the cubic phase, and the nano-sized monoclinic (M) phase was precipitated in the annealed coating. The presence of M phase effectively constrained the sintering of the coating due to its superior sintering-resistance. The Young's modulus kept at a nearly same level of ~78 GPa even after annealing, and the coating annealed for 6 h yielded a maximum value of hardness but revealed a declining tendency in the Vicker's hardness with prolonged sintering time. The thermal conductivity increased from 0.8-0.95 W m-1 K-1 at as-sprayed state to 1.6 W m-1 K-1 after annealing at 1400 °C for 96 h. The dual-phase coating is promising to serve at temperatures above 1400 °C due to its excellent thermal stability and mechanical properties. 相似文献
60.
《Ceramics International》2020,46(17):26530-26538
8 wt% yttria-stabilized zirconia (8YSZ) powders are fabricated as high-temperature based materials via a solid-state reaction method and ground into spheres in this paper. Following that, 4 wt% Nickle (Ni), 4 wt% Hexagonal Boron Nitride (hBN) and 4 wt% PHB (Polyphenyl ester) are added to 8YSZ for getting 8YSZ ceramic-based abradable seal powders (8YSZ CASp). Then, the 8YSZ CASp are sprayed on the stainless steel substrate with a NiCoCrAlY transition layer by an atmospheric plasma spraying (APS) technology. The phase structure, surface morphology and the cross-section topography of the fabricated are analyzed, the indentation hardness and nano-indentation test are conducted. The experiments of 8YSZ ceramic-based abradable seal coatings (8YSZ CASc) show that the deposition efficiency and porosity are respectively 78.5% and 21.8%, the bond strength is 4.6 MPa, the cycle number of thermal shock resistance is 37 times, those parameters prove that the fabricated 8YSZ CASc are promising abradable seal coatings. 相似文献