Wyniki wyszukiwania - BazTech

1

Carbide Cutting Tool Coatings Characterization of 8YSZ

Kareem Shaimaa J., Wurood Asaad M., Abbas Sundus, Al-Ethari Haydar

Advances in Science and Technology. Research Journal

|

2024

|

Vol. 18, no 4

410--419

EN

Using a duplex deposition of TiO2/8YSZ on a carbide cutting tool, a successful sol-gel procedure was achieved, resulting in high homogeneity, good dispersion, and a low average value of surface roughness (223.6)nm. Thermal experiments were done to see how well the coating layers could withstand heat transfer and thermal deterioration. Residual stresses for coated and uncoated carbide cutting tools are measured after thermal shock (thermal shock). Both were immediately chilled in ice water after being heated for 90 minutes for coated inserts and 30 minutes for uncoated inserts at 500, 600, 700, 800, 900, and 1200 °C. For inserts, thermal shock from 900 °C results in significantly different damage mechanisms. The uncoated outside surface is still delineated by a crack network and is surrounded by nearby homogenous cells, but the coated insert (sol gel TBC) in this case really has a few tiny cracks beginning at the edge. The coated insert (sol-gel TBC) fails after being heated to 1200 °C and then cooled in water to freezing which is caused the start of the duplex coating degradation.

2

Synthesis and optical properties of uranium-doped cadmium oxide synthesized by sol-gel method

Şerbetçi Zafer

Materials Science Poland

|

2020

|

Vol. 38, No. 1

23--27

EN

Optical properties of cadmium oxide and uranium-doped CdO thin films synthesized by the sol-gel technique were investigated. The structural properties of the films were investigated using X-ray diffraction patterns of U-doped CdO. It was found that CdO-based films have a cubic NaCl structure. Structural properties of the films were investigated with atomic force microscopy (AFM). Reflectance, transmittance and absorption spectra of the films were measured with UV-Vis-NIR spectrophotometer. The photoluminescence (PL) behavior of the films was recorded using a fluorescence spectrophotometer. It was found that the nanostructure of the cadmium oxide film is controlled by U doping.

3

Studies on rheological, structural, optical, electrical and surface properties of LiMn2O4 thin films by varied spin rates

Balakrishnan T., Subramanian N. S., Kathalingam A.

Materials Science Poland

|

2017

|

Vol. 35, No. 3

626--631

EN

LiMn2O4 thin films prepared by cost-effective spin coating method using optimized coating conditions are reported. Spin rate was varied and spin rate dependent properties were studied. Prepared films were characterized for their structural, morphological and optical properties. X-ray diffraction study of LiMn2O4 thin films confirmed the cubic spinel structure with the preferred orientation along (1 1 1) plane. Optical absorption studies showed band gap energy of 3.02 eV for the grown LiMn2O4 films. FT-IR bands assigned to asymmetric stretching modes of MnO6 group were located around 623 cm−1 and 514 cm−1 for the LiMn2O4 thin films. The weak band observed at 437 cm−1 was attributed to the LiO4 tetrahedra. The films showed high conductivity value 0.79 S/cm indicating the generation of effective network of the film for enhanced charge transport. AFM micrographs of the LiMn2O4 films deposited at 3000 rpm and 3500 rpm showed uniform distribution of fine grains throughout the surface without any dark pits, pinholes and cracks.

4

Structural and optical properties of SnO2-Al2O3 nanocomposite synthesized via sol-gel route

Mishra N. K., Kumar C., Kumar A., Kumar M., Chaudhary P., Singh R.

Materials Science Poland

|

2015

|

Vol. 33, No. 4

714--718

EN

A nanocomposite of 0.5SnO2-0.5Al2 O3 has been synthesized using a sol-gel route. Structural and optical properties of the nanocomposite have been discussed in detail. Powder X-ray diffraction and scanning electron microscopy with energy-dispersive X-ray diffraction spectroscopy confirm the phase purity and the particle size of the 0.5SnO2-0.5Al2 O3 nanocomposite (13 to 15 nm). The scanning electron microscopy also confirms the porosity in the sample, useful in sensing applications. The FT-IR analysis confirms the presence of physical interaction between SnO2 and Al2 O3 due to the slight shifting and broadening of characteristic bands. The UV-Vis analysis confirms the semiconducting nature because of direct transition of electrons into the 0.5SnO2-0.5Al2 O3 nanocomposites.

5

Structural and optical properties of pure and Ag doped ZnO thin films obtained by sol gel spin coating technique

Ali S. M., Farooq W. A., Baig M. R., Shar M. A., Atif M., Alghamdi S. S., Algarawi M. S., Naeem U. R., Aziz M. H.

Materials Science Poland

|

2015

|

Vol. 33, No. 3

601--605

EN

We have investigated the influence of Ag doping on zinc oxide thin films. Pure and Ag doped, preferentially oriented transparent zinc oxide thin films were prepared by sol gel technique on a glass substrate using diethyl amine as a stabilizer. The X-ray diffraction analysis revealed that the films with hexagonal wurtzite type structure were polycrystalline in nature with a preferred grain orientation in the 101 direction. The crystallite sizes decreased from 34 nm to 27 nm after silver doping. Both photoluminescence and optical transmission measurements showed that the band gap increased after the Ag doping. The structure and optical characterization studies clearly indicated the incorporation of Ag in ZnO. Hence, the observed increase in the optical band gap and decrease in crystallite size can be directly attributed to the effect of Ag ion incorporation into the ZnO lattice.