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| 1 | Effect of Pulse and Direct Current Electrodeposition on Microstructure,Surface,and Scratch Resistance Properties of Ni-W Alloy and Ni-W-SiC Composite Coatings显示文摘The present work aims to study the influence of direct current and pulse current techniques as well as embedded SiC nanoparticles on the mechanical properties of the electrodeposited Ni-W coating.The electrodeposited coatings were studied for morphological,microstructural,mechanical,and scratch resistance properties using the surface roughness tester,scanning electron microscopy,energy-dispersive X-ray spectroscopy,X-ray diffraction,Vickers microhardness,and scratch tester.Application of pulse current exhibited relatively homogeneous and smooth surface of the coatings.A remarkable increment of microhardness was observed in both Ni-W and Ni-W-SiC coatings prepared under pulse current as compared to the direct current technique.Similarly,the scratch test revealed a considerable improvement in the scratch resistance behavior of the Ni-W alloy and the composite coatings from the pulsed current condition.Hence,the application of pulse current not only improved the surface-and microstructure-related properties but also enhanced the Vickers microhardness and scratch resistance properties of the coatings.In addition,the reduction in micro-cracks revealed the improvement in scratch resistance properties of the coatings due to the incorporated SiC nanoparticles into the Ni-W alloy matrix. | Sami Bin Humam Gobinda Gyawali Dhani Ram Dhakal Jin-Hyuk Choi Soo Wohn Lee | 2020 | Acta Metallurgica Sinica(English Letters)2020，33，10： | 2 |
| 2 | Electrodeposited Ni-W-TiC Composite Coatings:Effect of TiC Reinforcement on Microstructural and Tribological Properties显示文摘Ni-W-TiC composite coatings were prepared via electrodeposition technique by dispersing the different amount of TiC particles into the plating bath.The Ni-W and Ni-W-TiC composite coatings containing different concentrations of TiC particles were characterized by using the scanning electron microscope,X-ray diffraction technique,Vickers microhardness test,surface roughness test,and tribology test.The results show that the Ni-W coatings containing reinforced TiC particles have shown a typical FCC Ni-W crystal structure with significantly higher Vickers microhardness.The amount of dispersed TiC particles into the plating bath considerably affected codeposition weight percent of TiC into the Ni-W matrix,as revealed by the EDS analysis.Ni-W-TiC samples demonstrated the decreased abrasive wear as compared to Ni-W coating and no characteristic features observed for the adhesive wear.Similarly,an improvement in coefficient of friction was observed in Ni-W-TiC composite coating as compared to Ni-W coating. | Jin Hyuk Choi Gobinda Gyawali Dhani Ram Dhakal Bhupendra Joshi Soo Wohn Lee | 2020 | Acta Metallurgica Sinica(English Letters)2020，33，4： | 1 |
| 3 | Antenna System Using a Plasma Column Having a Central Conductor and Excited by a Co -axial Line显示文摘 | Ram Dhani Verma J S | 1973 | International Journal of Electronics1973，35，11： | 1 |
| 4 | Spectroscopic properties of Er^(3+)/Ho^(3+)/Tm^(3+)dopedα-SiAlON ceramics under 793 nm excitation显示文摘This paper reports the first demonstration of super broadband infrared downshifting emission extending from1640 nm to 2200 nm with the full width at half maximum of~417 nm in lanthanides(Er^(3+),Ho^(3+),andTm^(3+))-dopedα-SiAlON ceramics upon 793 nm excitation.Usingα-Si;N;ceramic as a precursor the lanthanides-dopedα-SiAlON ceramics were synthesized by the hot-press method.The lanthanides induced no significant secondary phases in the sinteredα-SiAlON ceramics.Strong two-photon upconversion emission bands centered at 547,671 and 694 nm have also been observed upon 793 nm excitation.The time-resolved measurements of the upconversion emissions confirm that the efficient energy transfer among the Er^(3+),Ho^(3+)and Tm^(3+)ions as well as the ground state absorption in Er^(3+)and Tm^(3+)are responsible for the observed spectroscopic properties. | Bina Chaudhary Dhani Ram Dhakal Tae-Ho Kim Soo Wohn Lee Yuwaraj K.Kshetri | 2021 | Progress in Natural Science:Materials International2021，31，6： | 0 |
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