نتایج جستجو برای: nial
تعداد نتایج: 677 فیلتر نتایج به سال:
Trefwoorden: metalen en metaallegeringen ; vastestofchemie / diffusie / microstructuur / intermetallische verbindingen / grensvlakverschijnselen ; Kirkendall effect Subject headings: metals and metal alloys ; solid state chemistry / diffusion / microstructure / intermetallic compounds / interfacial phenomena ; Kirkendall effect To my Parents Contents Chapter 1: Introduction 1 1.1 Recent develop...
ترکیب بین فلزی آلومینایدنیکل (nial) دارای خواص عالی مانند دانسیته پایین، نقطه ذوب بالا، هدایت حرارتی خوب و مقاومت عالی به اکسیداسیون و خوردگی می باشد. با توجه به این خواص کاربردهای فراوانی در دمای بالا دارد. در این تحقیق ابتدا ترکیب بین فلزی نانوساختار آلومیناید نیکل به روش آلیاژسازی مکانیکی تولید گردید. به منظور بررسی ریزساختار و مورفولوژی ذرات از آنالیز xrd و sem استفاده شد. در زمانهای اولیه ...
Crystallographic textures in a CoCrPtTa/Cr/NiAl multilayer magnetic recording media were studied by electron diffraction. It was found that texture quality evolves through the thickness of the films. A large improvement of texture quality was discovered at the interface of the Cr and NiAl layers. Surprisingly, there remains a portion of randomly oriented grains in the CoCrPtTa layer, in additio...
Low-temperature STM measurements combined with DFT calculations are employed to study the adsorption of gold on alumina/NiAl(110). The binding of Au monomers involves breaking of an oxide Al-O bond below the adatom and stabilizing the hence under-coordinated O ion by forming a new bond to an Al atom in the NiAl. The adsorption implies negative charging of the adatom. The linear arrangement of f...
A description of the important physical metallurgy aspects of Ni3Al and NiAl encompassing structure, crystallographic defects, slip systems and phase stability has been presented in this article. The microstructures generated in the two alloys by conventional as well as novel processing techniques have been discussed. The effect of alloying additions on the microstructure has been enumerated. B...
Low-temperature STM measurements combined with density functional theory calculations are employed to study the adsorption of gold on alumina/NiAl(110). The binding of Au monomers involves breaking of an oxide Al-O bond below the adatom and stabilizing the hence undercoordinated O ion by forming a new bond to an Al atom in the NiAl. The adsorption implies negative charging of the adatom. The li...
پودر های کامپوزیتی زمینه nial مواد مناسبی برای پوشش سطوح در دمای 700-1000 درجه ی سانتیگراد به عنوان سپر حرارتی می باشند. در این مطالعه تولید پودرهای کامپوزیتی زمینه nial تقویت شده از 0 تا 40 درصد وزنی، با فاز های تقویت کننده متفاوت به روش سنتز احتراقی بررسی شد و امکان-سنجی تولید نانو کامپوزیت زمینه nial تقویت شده با nbb2 استفاده از سیستم واکنشی ni-al-nb-b با استفاده از روش آلیاژسازی مکانیکی مور...
In this study, a Cr-modified NiAl coating was fabricated by weld cladding technique using Gas- Tungsten Arc Welding (GTAW) process on 310 steel. Chemical composition and microstructure of the coating was studied by X-Ray Diffraction (XRD), optical microscopy and scanning electron microscopy equipped with an Energy Dispersive Spectroscopy (EDS). The wear behavior of the coated steel was examined...
Thermal spray coatings are widely used in many applications, and the adhesion effect at coating/substrate interface plays an important role during service life. The thermal spraying coating substrate is primarily combined by a mechanical seizure effect. In this work, strategy to generate interfacial metallurgical bonding proposed. Plasma with wire feeding was adopted increase size of sprayed pa...
Article history: NiAl+SiO2 thin films were Received 28 May 2007 Received in revised form 9 June 2008 Accepted 24 July 2008 Available online 29 July 2008
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