The degradation behaviors of TiN coating layers under thermo-mechanical stress were investigated in terms of comparison of finite element analysis (FEA) and experimental data. The coating specimen was designed to quarter cylinder model, and the pulsed laser ablation was assumed as heat flux condition. The FEA results showed that heat accumulation at the center of the laser-ablated spot occurred and principle stress was concentrated at the lower region of the coating layer. The microstructural observation revealed that surface melting and decrease of the coating thickness occurred in the TiN/Inconel 617 and the interfacial cracks formed in the TiN/Si. The delamination was caused by the mechanical stress from the center to the outside of the ablated spot as the FEA results expected. It was considered that the improvement of the thermal shock resistance was attributed to higher thermal conductivity of Si wafer than that of Inconel 617.
The compatibility of graphene with styrene-isoprene-styrene block copolymer (SIS) was examined. The morphology of the SIS/graphene composite observed by optical microscopy and the electrical conductivity of the composite showed that the compatibility of graphene with polystyrene (PS) block is better than that with polyisoprene (PI) block. Thermal analysis showed that the graphene is distributed preferentially at PS block domain rather than at PI block domain. The graphene enhanced the modulus of matrix polymer drastically, however, elongation at break and toughness were reduced evidently.
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