Surface Review and Letters最新文献

$\beta$-In₂S₃ thin films ($\mathrm{\text{S/In}}=1$, 2 and 4) were prepared using the pneumatic spray pyrolysis (PSP) route to analyze the effect of the S/In ratio on the physical properties. These properties were conducted using the photothermal deflection spectroscopy (PDS) method. The PDS signal amplitudes as a function of wavelength show multiple reflections which appear for all prepared In₂S₃ films. Such multiple reflections indicate homogeneity and high crystalline quality of the films. The deduced values of the optical band gap vary in the range 2.55–2.65$$eV. The highest thermal diffusivity is obtained for $\mathrm{\text{S/In}}=2$. The product ($\mu \cdot \tau$) is found in order of 10${}^{-8}$$$cm${}^{-1}$/V. The estimated carrier diffusion lengths are 0.06, 0.11 and 0.09$$$\mu$m for films corresponding to $\mathrm{\text{S/In}}=1$, 2 and 4, respectively. Defect absorption in $\beta$-In₂S₃ films is also investigated by PDS. Five absorption peaks are observed. These absorption peaks contain defect information in the band gap. Hence, this work evidences that $\beta$-In₂S₃ is a multi-functional material that can be used in optoelectronic, photovoltaic and visible-irradiation photocatalyst applications.

In the recent study, accumulative roll bonding (ARB) and powder metallurgy processes are used as a combined technique to fabricate AA1050/TiC composite strips. Then, corrosion, mechanical, wear properties and microstructural evolution of them have been investigated via TiC Wt.%. All composite samples were fabricated after four cycles to get a uniform scattering of particles inside the metallic matrix. Moreover, density as a physical property and electrical resistivity and conductivity have been investigated vs particles value. The results showed that by increasing the particles value (Wt.%), hardness, density, corrosion and wear resistance of samples improved while their electrical conductivity, bonding strength and elongation decreased. For samples with 10$$Wt.% of TiC and in comparison with the monolithic sample, the hardness and tensile strength of composite samples improved 127% and 63%, respectively. Finally, SEM morphology of worn and corrosive surfaces has been investigated.

The configurations, electronic, and magnetic properties of the H₂DBP-M clusters have been investigated via density functional theory. The results reveal that the TM atoms for the H₂DBP-M ($\mathrm{\text{M}}=\mathrm{\text{Sc}}$, Y, Zr, Nb, Lu, and Hf) clusters deviate from the center planes of the clusters. The H₂DBP-M ($\mathrm{\text{M}}=\mathrm{\text{Sc}}$, Y, and Lu) clusters display the largest dipole magnitudes. Based on the binding energy per atom and HOMO-LUMO gap, the H₂DBP-Ni and H₂DBP-Lu clusters are the most favorable for synthesis. The charge transfer amounts of the TM ($\mathrm{\text{TM}}=\mathrm{\text{Sc}}$, Zn, Y, Cd, Hf, and Hg) atoms for the H₂DBP-M clusters are larger. The TM-d orbitals of the H₂DBP-M ($\mathrm{\text{M}}=\mathrm{\text{Ti}}\sim$Co and Cu) clusters contribute significantly to the Fermi levels. The spin densities of the TM atoms for the H₂DBP-M clusters reduce to 0 except for that ($V=2.459|\mathrm{\text{e}}|$) of the H₂DBP-V clusters.

A large part of the cost of steel production in the world is related to the consumption of graphite electrodes. Electrode is the only material that maintains its electrical conductivity at high temperatures, and hence it is used as a conductor of electric current in EAF furnaces. Considering the high costs of graphite electrodes, any action that leads to reducing the consumption of graphite electrode can lead to increasing the productivity of steelmaking operations. In this study and as its novelty, the electrophoretic method was used to generate a ceramic coating for the protection of graphite electrodes. Electrophoretic deposition (EPD) is a two-step process in which charged particles suspended in a suspension move towards the oppositely charged electrode under the influence of an electric field which combine as a dense film on the surface. In the EPD technique, the particle size limit is not very important if a stable suspension is formed and micro and nano-sized particles can be used in this method. The numerical simulation of the thermal contour on the graphite electrode was done in ABAQUS software. Moreover, the surface morphology of graphite samples has been investigated via scanning electron microscopy (SEM). The created coating was a combination of Al₂O₃ and SiO₂, which was placed on the surface of test samples by EPD treatment. The obtained results have the properties of resistance to thermal shock and show the increase in the life of coated graphite samples at different temperatures and times.

Inconel-625 is a high-performance nickel-based superalloy which offers exceptional properties such as extensive resistance to corrosion, high strength-to-weight ratio, hardness, and impressive heat tolerance. Machining precise holes with required dimensional accuracy is challenging in Inconel-625 using conventional drilling processes. The investigation aims to improve the quality characteristics of hole machined on Inconel-625 by using the abrasive aqua jet drilling (AAJD) process. The influence of jet pressure ($J_P$), table feed ($T_F$), mass flow rate ($M_{\mathrm{\text{FR}}}$) and gap distance ($G_D$) on the erosion rate ($E_R$), surface roughness ($R_a$), circularity error (CI${}_{\mathrm{\text{error}}}$) and striation zone ($S_{\mathrm{\text{ZN}}}$) are investigated. The weighted principal component analysis (WPCA)-based response surface methodology (WPC-RSM) is employed to analyze and optimize process parameters. The optimal parameter settings ($J_P$ -300 MPa, $G_D$-1.5 mm, $T_F$-64 mm/min, $M_{\mathrm{\text{FR}}}$-0.55 kg/min) are observed to produce substantial improvement in re