Development and Airworthiness Certification of the Ti6Al4V Inlet Casing Inner Forging

The inlet casing inner has manufactured using Ti-6Al-4V alloy through a closed die-forging route. It undergoes cyclic loads in addition to operating in extreme conditions in high-temperature environments. The demanding mission requirement of these engines necessitates the inlet casing inner to be flawless throughout its life cycle while retaining its structural integrity. It makes the qualification for airworthiness of the casing, a daunting task. In addition, the qualification tests also help to evaluate the design and manufacturing processes (closed die forging) of the inlet casing inner. The tests also provide data for further improvement of the inlet casing inner in terms of strength and fatigue life. It helps to ensure that the inlet casing inner will be able to perform as expected throughout its operational life. All the batch and consolidated test results comply with the relevant ASTM, MIL standards, and test schedule requirements

Characterization of the carbon-coated LiNi1−yCoyPO4 solid solution synthesized by a non-aqueous sol-gel route

Nanosize carbon-coated samples of the solid solution LiNi1−yCoyPO4 were prepared and investigated with respect to high-voltage cathode materials (4–5 V) for Li-ion batteries. For the syntheses, a modified non-aqueous sol-gel approach under argon atmosphere was applied. Crystal structure and morphology of the products were analyzed by X-ray powder diffraction, scanning electron microscopy, and Raman spectroscopy. Phase pure samples crystallize in the olivinetype structure with a linear relation between lattice parameters and chemical composition. The mean crystal size of the particles is smaller than 300 nm with increasing agglomeration towards samples with higher nickel content. Effects of the Ni/Co ratio on P-O and M-O bonds were explored by FTIR and UV/VIS measurements, too. Substitution of Ni by Co causes larger cell volumes, longer atomic distances, and weaker P-O andM-O bonds. Additional studies focus on the mechanismof formation of LiNiPO4 and the conditions for the formation of the phosphide by-products Ni3P and Ni12P5 by carbothermal reduction. The electrochemical properties of all compounds were nvestigated by galvanostatic charge/discharge measurements and differential capacity analysis. The small particles of the sol-gel process lead to a superior capacity in comparison to a common solid-state synthesis. Cyclability of the whole solid-solution is evaluated for the first time. For a Ni content of 33 %, the voltage is shifted to a higher level and a positive effect on capacity retention is observed

Optimized Synthesis of PEG-Encapsulated Gold Nanorods for Improved Stability and Its Application in OCT Imaging with Enhanced Contrast

10.1007/s11468-012-9438-1Plasmonics82591-59