Development of industrial components by advanced squeeze casting

Rosso, Mario; Peter, Ildiko; Bivol, Catalin; Molina, R.; Tonno, G.

doi:10.1007/s12289-010-0888-8

Cited by 32 publications

(25 citation statements)

References 6 publications

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“…Among numerous bottom-up strategies for nanofabrication, self-assembly of block copolymers (BCPs) has been recognized as versatile platform by which highly ordered periodic metallic, inorganic, and semiconductor nanostructures, such as nanodots, 15,16 2-dimensional (2D) porous titania, and highly ordered 3D-networks [17][18][19] can be developed. In addition to typical classic morphologies (e.g., lamellae, spheres, cylinders, and bicontinuous networks), recent experimental reports also show that other intricate morphologies, such as helices, 20 cylindrical networks, 21 nanotubes, 22 hollow hoops, 23 bowl-shaped micelles, and ringlike supramolecular assemblies can be observed from BCP solutions in selective solvents.…”

Section: Introductionmentioning

confidence: 99%

One step route to the fabrication of arrays of TiO₂nanobowls via a complementary block copolymer templating and sol–gel process

Peng

Kang³

et al. 2008

Soft Matter

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Section: Introductionmentioning

confidence: 99%

One step route to the fabrication of arrays of TiO₂nanobowls via a complementary block copolymer templating and sol–gel process

Peng

Kang³

et al. 2008

Soft Matter

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“…5,12 Although mesoporous STO has been prepared via templatedirected synthesis using various soft (e.g. surfactant or polymer 13 ) and hard (e.g. inorganic salts 14 ) templates, the synthesis of mesoporous STON has rarely been achieved.…”

mentioning

confidence: 99%

Template-free synthesis of mesoporous N-doped SrTiO3 perovskite with high visible-light-driven photocatalytic activity

et al. 2012

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An effective, template-free synthesis methodology has been developed for preparing mesoporous nitrogen-doped SrTiO 3 (meso-STON) using glycine as both a nitrogen source and a mesopore creator. The N-doping, large surface area and developed porosity endow meso-STON with excellent activity in visible-light-responsive photodegradation of organic dyes.The exceptional electro-optical properties and physicochemical stability of the perovskite SrTiO 3 (STO) give rise to its attractive performance in photocatalytic applications of solar power, including photocatalytic degradation of organic pollutants, water splitting and photoreduction of CO 2 .1-3 However, the intrinsic large bandgap energy (E g = 3.2 eV) of SrTiO 3 allows only the utilization of UV light, encompassing approximately 5.0% energy of the sunlight. 4 A variety of transition metals (TM) have been doped into a STO's crystal matrix in efforts to tune its electronic bandgap for harvesting visible light. 5,6Unfortunately, TM-doping can also bring about either phase impurity or fast recombination of photogenerated charge carriers. Nonmetal-doping represents another effective strategy to realize visible-light response.7-9 Indeed, it was found that N-doped SrTiO 3 (SrTiO 3Àx N x , STON) exhibited excellent photoreactivity and stability under visible-light irradiation. 10Mesoporous-structured photocatalysts are highly desirable in photocatalysis since their large specific surface area (SSA) and mesoporous channels greatly facilitate adsorption, diffusion and surface reaction of the reactants.11 STO perovskite belongs to the cubic crystal system, and typically has low SSA and poor porosity. Moreover, the porosity of STO could be further destroyed by the known processes of nitriding STO to STON. 5,12Although mesoporous STO has been prepared via templatedirected synthesis using various soft (e.g. surfactant or polymer 13 ) and hard (e.g. inorganic salts 14 ) templates, the synthesis of mesoporous STON has rarely been achieved.Here we report a novel, template-free synthesis methodology to prepare mesoporous STON using glycine as both a nitrogen source and a mesopore creator. Aqueous solution of glycine and Sr(NO 3 ) 2 was dropped into ethanol solution of titanium butoxide under stirring, followed by solvent evaporation and subsequent calcinations at 550 1C for 2 hours. The obtained STON was characterized by XRD, TEM, FTIR, UV-vis, and XPS techniques and used for the photodegradation of three refractory organic dyes under visible-light irradiation.Only a strong single peak appears in the small angle XRD pattern (Fig. 1) of the STON sample, suggesting that it possesses disordered wormlike mesopores. 15 The TEM image in Fig. 2A nicely confirms such mesoporosity. The HRTEM image inserted in Fig. 2A reveals that the walls of the mesopores are comprised of single crystal perovskite STON. The labelled lattice distances are consistent with those of (100) and (110) diffractions obtained from XRD tests (Fig. S1, ESIw). In contrast, the STO sample presents poor mesoporous featu...

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“…In this section some results will be presented based on the study carried out on two components, using A356 and A380 (with the chemical compositions reported in Table 1) Al alloys, manufactured by advanced squeeze casting [85]. The components were T6 heat-treated (510°C for 6 h, water quenched to room temperature and aged at 200°C for 8 h) and their properties were evaluated to study how the alloy composition and the process parameters influence the performance of the final component.…”

Section: Modified Squeeze Casting Process -Experimental Resultsmentioning

confidence: 99%

Light Alloys — From Traditional to Innovative Technologies

Peter¹,

Rosso²

2015

New Trends in Alloy Development, Characterization and Application

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Selection of materials with the expected, application-dependent characteristics constitutes a very important point in any industrial application. In the automotive and aeronautical industries, the current tendency is to use light metals and their alloys for production of various components. For example, some of the problems related to fuel consumption and weight reduction could be partially solved by using such alloys as an alternative to traditional iron-based alloy components. Due to their very attractive properties, the most commonly employed light materials for producing high-stressed components are aluminium, magnesium and their alloys. Al-based alloys have a high strength/weight ratio, good formability, excellent combination of castability and mechanical properties which together with an excellent corrosion resistance make them very appropriate for a large variety of applications. There are two important families of aluminium alloys: (i) wrought alloys, firstly cast as ingots and/or billets and then mechanically hot-and/or cold-worked into the preferred shape, and (ii) cast alloys, directly cast into their final form through different traditional or innovative processes. At the same time, there is continuing interest in Mg alloys for engineering proposals because of their lowest density directly connected to a weight saving of about 40% compared to steel and cast iron and 20% compared to aluminium for the same component performance. Their high specific strength, good castability and machinability, high thermal conductivity, high dimensional stability, good electromagnetic shielding property, high damping characteristics and full recyclability place them in a particular position for production of different types of components. High-pressure die casting is the most widely used technique and represents about 50% of all light alloy casting production. The tendency to use low-pressure die casting is increasing

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Development of industrial components by advanced squeeze casting

Cited by 32 publications

References 6 publications

One step route to the fabrication of arrays of TiO₂nanobowls via a complementary block copolymer templating and sol–gel process

One step route to the fabrication of arrays of TiO₂nanobowls via a complementary block copolymer templating and sol–gel process

Template-free synthesis of mesoporous N-doped SrTiO3 perovskite with high visible-light-driven photocatalytic activity

Light Alloys — From Traditional to Innovative Technologies

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Development of industrial components by advanced squeeze casting

Cited by 32 publications

References 6 publications

One step route to the fabrication of arrays of TiO2nanobowls via a complementary block copolymer templating and sol–gel process

One step route to the fabrication of arrays of TiO2nanobowls via a complementary block copolymer templating and sol–gel process

Template-free synthesis of mesoporous N-doped SrTiO3 perovskite with high visible-light-driven photocatalytic activity

Light Alloys — From Traditional to Innovative Technologies

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One step route to the fabrication of arrays of TiO₂nanobowls via a complementary block copolymer templating and sol–gel process

One step route to the fabrication of arrays of TiO₂nanobowls via a complementary block copolymer templating and sol–gel process