Data Mining and Social Media for promotion and marketing in the Aerospace Industry

Data mining and social media is an innovative platform for the aerospace industry to focus, promote and market the industry in the upcoming economy. Data mining techniques allow the industry to build a comprehensive system that helps to make intelligent management decisions in a formal system. On the other hand Social Media is used as a tool to ensure maximum return by entering a hybrid media landscape, one where the rapid growth of Social Media complements and enhances the efficiency of the industry. By using trend analysis this research would showcase benefits that the industry will achieve by increasing their profit margins and market competiveness. This research mainly focuses on supporting the aerospace industry to build trust among customers and meeting demand specifications by using data mining techniques and social media platform

How to overcome the main challenges of SPS technology: Reproducibility, multi-samples and elaboration of complex shapes

The spark plasma sintering process (SPS) permits the densification of a wide variety of materials [1–2] (metals, alloys, ceramic, polymer, and composites). This breakthrough sintering technique is able to create highly dense materials with micro-structural control and a very short processing time [3–5]. Although it has experienced a very strong growth in the last three decades in terms of publications and patents, its industrialization is still in its infancy. This is mainly due to the fact that only pieces of simple geometries have been densified so far, and that this technology is considered to suffer from a lack of reproducibility and productivity. We will try to show in this chapter how to overcome three of the main challenges of SPS technology: reproducibility, multi-samples, and elaboration of complex shapes

Powder synthesis and densification of ultrafine B₄C-ZrB₂ composite by pulsed electrical current sintering

Submicrometer sized B₄C-30 vol% ZrB₂ ceramic composites were made both by one-step in situ pulsed electric current sintering (PECS) of a B₄C, ZrO₂ and carbon black powder mixture or by PECS of B₄C-ZrB₂ powder mixtures synthesized by thermal treatment in vacuum at 1100–1400 °C for 2 h. The influence of the processing temperature on the phase evolution and chemical composition of the mixtures were investigated in detail by Rietveld XRD and SEM analysis. Conventional vacuum thermal treatments allowed to synthesize homogeneous and submicrometer sized B₄C-ZrB₂ powder mixtures at 1300 and 1400 °C for 2 h, whereas 37 and 11 wt% (m + t)-ZrO₂ was present in the mixtures processed at 1100 and 1200 °C respectively. Subsequent PECS treatment at 2000 °C for 5 min allowed to obtain B₄C-ZrB₂ composites from these thermally treated B₄C + ZrO₂ + C powder mixtures. In the one-step in situ process, a PECS temperature of 1900 °C was necessary to complete the conversion of the in situ formed B₂O₃ to B₄C to form B₄C-ZrB₂ composites. The composites prepared by both routes exhibited a Vickers hardness (HV₁₀) of 30–32 GPa, a modest fracture toughness of 2.4–2.9 MPa m¹/² and a good flexural strength of 630–730 MPa.publisher: Elsevier articletitle: Powder synthesis and densification of ultrafine B4C-ZrB2 composite by pulsed electrical current sintering journaltitle: Journal of the European Ceramic Society articlelink: http://dx.doi.org/10.1016/j.jeurceramsoc.2014.01.022 content_type: article copyright: Copyright © 2014 Elsevier Ltd. All rights reserved.status: publishe

Rapid synthesis and elastic properties of fine-grained Ti₂SnC produced by spark plasma sintering

Fine-grained Ti₂SnC was successfully synthesized and densified by spark plasma sintering (SPS) of pure Ti, Sn and C powders at 1200–1400 °C. Ti₂SnC was the predominant phase at 1325 °C, with minor amounts of remaining Sn and TiCₓ. At lower processing temperatures, Ti–Sn intermetallics and TiCₓ were present, whereas the decomposition of the MAX phase into Sn and TiCₓ was observed at higher temperatures. The shear modulus, Young’s modulus and Poisson’s ratio were measured to be 83.9 GPa, 207.4 GPa and 0.24, respectively. The evolution of the Young’s modulus as a function of temperature was measured up to 800 °C.publisher: Elsevier articletitle: Rapid synthesis and elastic properties of fine-grained Ti2SnC produced by spark plasma sintering journaltitle: Journal of Alloys and Compounds articlelink: http://dx.doi.org/10.1016/j.jallcom.2014.12.255 content_type: article copyright: Copyright © 2015 Elsevier B.V. All rights reserved.status: publishe

Microstructure analysis and mechanical properties of NbC-Co/Ni/Fe3Al/Cu/ cemented carbides

NbC has a high hardness (19.6 GPa) and melting temperature (3600°C), and is used as a grain growth inhibitor in WC-Co cemented carbides. In the present study, the influence of different binders on the sintering ability, microstructure and mechanical properties of NbC-matrix cemented carbides was investigated. The binders are Co, Ni, Fe3Al or Cu. The powder mixtures were sintered in the solid state by spark plasma sintering and in the liquid state by conventional vacuum sintering. The binders not only affected the densification but also the microstructure and mechanical properties. A limited NbC grain growth was found in the NbC-Cu and NbC-Fe3Al materials, whereas rapid grain growth occurred in the Co and Ni bonded NbC. A detailed microstructural analysis was conducted by electron probe microanalysis. Mechanical properties, such as Vickers hardness and indentation toughness were compared.status: publishe

Production and characterization of ZrO2 ceramics and composites to be used for hip prosthesis

Tetragonal ZrO2 polycrystalline (TZP) ceramics with varying yttria and ceria content (2-3 mol%) and distribution (coated or co-precipitated), and varying second phase content Al2O3 were prepared and investigated by means of microstructural analysis, mechanical properties, and hydrothermal stability, and ZrO2-based composites with 35-60 vol% of electrical conductive TiN particles were developed. The effects of stabilizer content and means of addition, powder preparation, sintering conditions, and grain size have been systematically investigated. Fully dense Y-TZP ceramics, stabilized with 2-3 mol% Y2O3, 2 wt% Al2O3 can be achieved by hot pressing at 1,450 degrees C for 1 h. The hydrothermal stability increased with increasing overall yttria content. The jet-milled TiN powder was used to investigate the ZrO2-TiN composites as function of the TiN content. The experimental work revealed that fully dense ZrO2-TiN composites, stabilized with 1.75 mol% Y2O3, 0.75 wt% Al2O3, and a jet-milled TiN content ranging from 35 to 60 vol% could be achieved by hot pressing at 1,550 degrees C for 1 h. Transformation toughening was found as the primary toughening mechanism. The decreasing hardness and strength could be attributed to an increasing TiN grain size with increasing TiN content, whereas the decreasing toughness might be due to the decreasing contribution of transformation toughening from the tetragonal to monoclinic ZrO2 phase transformation. The E modulus increases linearly with increasing TiN content, whereas the hydrothermal stability increases with addition of TiN content.status: publishe

Wetting and solidification of silver alloys in the presence of tungsten carbide

The wettability of pure Ag and Ag alloys (with Ni and Cu) on WC was investigated as a function of temperature by means of sessile drop experiments. Ni was found to preferentially segregate at the Ag/ WC interface resulting in a decreased contact angle as compared to Cu. The influence of the Ni content and WC particle size on the solidification behavior of Ag in infiltrated Ag-WC-Ni (40 wt% WC and 0.07/ 5 wt% Ni) composites was assessed, revealing the pushing of WC particles by the solidification front, especially in the materials with a finer WC particle size. Addition of Ni decreased the grain size of the Ag phase by promoting heterogeneous nucleation. Complete coherency between the Ag and Ni phases was confirmed by electron backscattered diffraction analysis.status: publishe