NiAl intermetallic coatings elaborated by a solar assisted SHS process

Bautista, Carlos Sánchez; Ferrière, Alain; Rodríguez, Gabriel Peña; López-Almodovar, M.; Barba, A.; Sierra, C.; Vázquez, A.J.

doi:10.1016/j.intermet.2005.11.022

Cited by 33 publications

(9 citation statements)

References 20 publications

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“…The fact that the tests are carried out outdoors will favor carbon combustion with oxygen. In case of a controlled atmosphere (reductant), the levels of metallization achieved would be higher . It was decided to use a simplified experimental device to dismiss with the use, for example, of a transparent hood to the solar radiation to prevent the sample from direct contact with air and, instead, it would maintain a conditioned atmosphere with reducer and inert gases thus favoring the degree of metallization of the products .…”

Section: Resultsmentioning

confidence: 99%

“…In case of a controlled atmosphere (reductant), the levels of metallization achieved would be higher . It was decided to use a simplified experimental device to dismiss with the use, for example, of a transparent hood to the solar radiation to prevent the sample from direct contact with air and, instead, it would maintain a conditioned atmosphere with reducer and inert gases thus favoring the degree of metallization of the products . The non‐use of the hood is because it is necessary to identify the trial with an industrial sintering process where the atmosphere is not controlled, unlike the tests performed on an indirect use analysis, in which mill scale is used, where an atmospheric control is performed .…”

Section: Resultsmentioning

confidence: 99%

“…The solar oven at Odeillo is based on solar rays striking a heliostat, which follows the path of the sun and reflects the rays at a 2.0 m diameter concentrator parabola which makes solar radiation converge at a focal point with a dimension of approximately 12.2 mm in diameter (The spot is slightly wider than the width of the crucible to affect the entire load perfectly, in case of small deviations of the spot) (Figure b). The power density of the incident radiation, which is of the order of 800–1000 W m −2 , thus increases by four orders of magnitude to values of 1040–1650 W cm −2 …”

Section: Experimental Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Transformations in the Iron-Manganese-Oxygen-Carbon System Resulted from Treatment of Solar Energy with High Concentration

Mochón

Ruiz-Bustinza

Vázquez³

et al. 2014

steel research int.

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With the aim of achieving a "zero waste" generation in industry, particularly in that of iron and steel, we propose studying the option to compete in this type of process, making use of an energy that, in addition to being free of contaminants, is also inexhaustible as is the case of solar energy. Solar energy is currently polarized has its greatest use in the production of electricity, either via thermal solar or photovoltaic, and it is also used as a low temperature heat source for water heating applications in households, hospitals, or hotels. Solar energy, when properly focused, can offer great potential for application in basic operations as well as processes of a chemical or chemical-metallurgical nature used for the obtaining, manipulation, and finishing of metals. Moreover, much waste from the iron and steel industry, make up a by-product whose exploitation requires high energy consumption in order that, either attempts are made to recycle them directly, or they are attempted to be taken advantage by feeding them, together with the conventional load, in reduction ovens. High temperature concentrated thermal solar energy could permit, on one hand, the generation of a high quality product (free of impurities which are detrimental to the process) using clean energy, and, thusly, fulfill the goal of achieving a "zero waste" generation.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Transformations in the Iron-Manganese-Oxygen-Carbon System Resulted from Treatment of Solar Energy with High Concentration

Mochón

Ruiz-Bustinza

Vázquez³

et al. 2014

steel research int.

View full text Add to dashboard Cite

show abstract

“…Solar energy has shown great potential in thermal protection tests [17,18], heat treatments for microstructural modifications, such as solar hardening [19] and solar coating of steels [20], surface nitriding of titanium and its alloys [21], solar welding of steel [22], titanium alloys [23], or aluminum 5083-H11 [24], or even the sintering of different PM materials, such as steels or Ti6Al4V alloy. Metallic powders of M2 high-speed steel and of M2 reinforced with different vanadium carbide amounts were sintered using concentrated solar energy [25,26].…”

Section: Introductionmentioning

confidence: 99%

Sustainable Production of Powder Metallurgy Aluminum Foams Sintered by Concentrated Solar Energy

Cañadilla

Romero

Rodríguez

2021

Metals

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Porous aluminum foams were successfully fabricated following the space-holder powder metallurgy method with a solar sintering stage. Al foams with porosities of 50, 60, and 70 vol.% were sintered in a low-cost Fresnel lens. Green parts were prepared using aluminum powder as the main metallic material and saccharose as a soluble space-holder. The dissolution stage was designed for each foam and required longer periods of time, between 8 and 32 h, as the design porosity increased. Brown parts were fully sintered by concentrated solar energy at a lower temperature (500 °C) and for shorter times (12–20 min) than those required by conventional sintering techniques (640 °C, ~9 h). The evaluation of density and the characterization of pore size and distribution in the sintered foams was carried out. All obtained foams were stable and presented a homogeneously distributed porosity, very close to the design porosity, with differences lower than 2.1 vol.%, and with approximately half being characterized as open porosity. Moreover, the solar sintered foams presented a high quality, and similar or even greater mechanical properties (such as compressive strength and impact energy absorption) than those achieved by conventional techniques. Foams with 50 vol.% of porosity exhibited the best mechanical behavior, in terms of impact-energy absorption (24.42 MJ/m3) and compressive strength (27.4 MPa).

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“…Exothermic reaction in nanostructured Al/Ni materials, such as composite particles and multilayered foils, has been studied extensively. − Localized heating of these materials initiates a self-sustained reaction, which propagates in the form of a reaction wave with high velocity (up to 10 m/s). , The temperature in the combustion front can be as high as 1900 K, , with the material reaching its maximum temperature within the span of a millisecond. , These unique features make reactive Al/Ni nanostructured materials valuable for the rapid synthesis of intermetallic compounds − and chemical energy storage ,,− applications. When joining refractory materials, self-sustaining reactions of sputter-deposited Al/Ni foils involving alternating nanoscale metal layers are widely utilized. − …”

Section: Introductionmentioning

confidence: 99%

Kinetics and Mechanism of Ignition in Reactive Al/Ni Nanostructured Materials

Manukyan¹,

Pauls²,

Shuck³

et al. 2018

J. Phys. Chem. C

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A high-speed electrothermography approach is applied to investigate the mechanism and kinetics for nanostructured Al/Ni foils. Application of the Kolmogorov−Johnson−Mehl−Avrami and adiabatic thermal explosion models reveal that the activation energy for nucleation appears to be much higher than that for the reaction. It is shown that formation of intermetallic nuclei is the limiting step that defines the ignition characteristics of the foils at temperatures below 500 K, while the process is reaction-limited at higher temperatures. Nucleation is also shown to play an important role during rapid (∼10 m/s) propagation of the combustion (reaction) wave along the Al/Ni foils. These findings suggest new approaches for controlling the ignition and combustion processes for nanostructured reactive materials.

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NiAl intermetallic coatings elaborated by a solar assisted SHS process

Cited by 33 publications

References 20 publications

Transformations in the Iron-Manganese-Oxygen-Carbon System Resulted from Treatment of Solar Energy with High Concentration

Transformations in the Iron-Manganese-Oxygen-Carbon System Resulted from Treatment of Solar Energy with High Concentration

Sustainable Production of Powder Metallurgy Aluminum Foams Sintered by Concentrated Solar Energy

Kinetics and Mechanism of Ignition in Reactive Al/Ni Nanostructured Materials

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