Electrical Property Characterization of Plasma Sprayed Polycrystalline Silicon

Silicon-based materials have been widely applied in industrial fields, such as microelectronic and solar power, for the specific electronic properties. In the present work, free-standing thick silicon coatings were fabricated by air plasma spraying (APS) and vacuum plasma spraying (VPS) technologies. The microstructure and electrical property of the coatings were characterized. It was found that the electrical resistance of APS-Si coating was higher than that of VPS-Si coating. The impedance spectroscopy results showed there was significant difference in impedance curves of APS-Si and VPS-Si coatings. The grain boundary semicircle appeared in the plot of VPS-Si coating, while did not appeared in that of APS-Si coating. It was thought that the electrical property difference of the two kind coatings was related with the oxidation and microstructure difference of the coatings.

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Influence of Surface Composition of Silicon-Based Material on their Bioactivity

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.512-515.1826 ◽

2012 ◽

Vol 512-515 ◽

pp. 1826-1829

Author(s):

Ya Ran Niu ◽

Xue Bin Zheng ◽

You Tao Xie

Keyword(s):

Silicon Wafer ◽

Plasma Spraying ◽

Photoelectron Spectroscopy ◽

Silicon Oxide ◽

Surface Composition ◽

Control Sample ◽

Atomic Ratio ◽

Air Plasma ◽

Vacuum Plasma Spraying ◽

Silicon Based

Silicon coatings were prepared by vacuum plasma spraying (VPS) and air plasma spraying (APS) technologies. The samples were hydrothermally treated and then incubated in simulated body fluid (SBF) to evaluate their bioactivity and silicon wafer was used as control sample at the same time. The SBF test showed that a Ca-P layer was formed on the surface of silicon wafer and VPS-Si coating after immersion in SBF for certain time, indicating their improved bioactivity. Whereas no Ca-P layer was found on the surface of APS-Si coating. The results of X-ray photoelectron spectroscopy showed that the Si/O atomic ratio and chemical depth profiles of the silicon oxide films on the surface of silicon wafer, VPS-Si and APS-Si coatings were different. The results indicated that the bioactivity difference of silicon-based material resulted from the different composition of their surface. Hydrothermal treatment maybe a favorable method to improve the bioactivity of silicon-based material having silicon oxide of non-stoichiometric Si/O atomic ratio.

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In situ electrical property characterization of individual nanostructures using a sliding probe inside a transmission electron microscope

2010 IEEE Nanotechnology Materials and Devices Conference ◽

10.1109/nmdc.2010.5652591 ◽

2010 ◽

Cited By ~ 2

Author(s):

Zheng Fan ◽

Xinyong Tao ◽

Yiping Li ◽

Yingchao Yang ◽

Jun Du ◽

...

Keyword(s):

Electron Microscope ◽

Electrical Property ◽

Transmission Electron Microscope ◽

Transmission Electron ◽

Property Characterization

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Microstructural and tribological characterization of air plasma sprayed nanostructured alumina–titania coatings deposited with nitrogen and argon as primary plasma gases

Materials & Design (1980-2015) ◽

10.1016/j.matdes.2014.02.040 ◽

2014 ◽

Vol 59 ◽

pp. 252-263 ◽

Cited By ~ 24

Author(s):

V. Bolleddu ◽

V. Racherla ◽

P.P. Bandyopadhyay

Keyword(s):

Air Plasma ◽

Plasma Sprayed ◽

Tribological Characterization ◽

Titania Coatings

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Characterization of Plasma Sprayed and Electron Beam-Physical Vapor Deposited Thermal Barrier Coatings

Volume 4: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; IGTI Scholar Award ◽

10.1115/97-gt-531 ◽

1997 ◽

Cited By ~ 2

Author(s):

Z. Mutasim ◽

C. Rimlinger ◽

W. Brentnall

Keyword(s):

Electron Beam ◽

Thermal Barrier Coatings ◽

Thermal Barrier ◽

Air Plasma ◽

Barrier Coatings ◽

And Performance ◽

Plasma Sprayed ◽

Industrial Gas Turbine ◽

Tbc Systems

Laboratory testing was conducted on air plasma sprayed (APS) and electron beam-physical vapor deposited (EB-PVD) thermal barrier coatings (TBCs) applied onto nickel alloy specimens. As-coated chemistry, microstructure, and bond strength of the TBC systems were evaluated. Cyclic oxidation tests that simulated industrial gas turbine environments were also conducted on the various thermal barrier coatings. This study evaluated the effects of ceramic and metallic coating compositions and application processes on coatings microstructure and performance. The relative cyclic performance of the TBC systems was determined from the laboratory tests.

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Microstructure and Oxidation Behavior of Molybdenum Disilicide Coating Prepared by Air Plasma Sprayed

Materials Science Forum ◽

10.4028/www.scientific.net/msf.686.583 ◽

2011 ◽

Vol 686 ◽

pp. 583-588 ◽

Cited By ~ 2

Author(s):

Jian Hui Yan ◽

Si Wen Tang ◽

Jian Guang Xu

Keyword(s):

Plasma Spraying ◽

Gas Turbines ◽

Hexagonal Lattice ◽

Molybdenum Disilicide ◽

Temperature Structure ◽

Air Plasma ◽

Air Plasma Spraying ◽

Plasma Sprayed ◽

Molybdenum Disilicide Coating ◽

Oxidation Behaviors

Intermetallics molybdenum dislicied has a great potential as a protective coating in aircraft engines and gas turbines in the elevated temperature. The suit for plasma spraying MoSi2powders were prepared by spray drying process and vacuum sintered. The oxidation behaviors of the coating were determined at 1200 °C. The coatings as sprayed and oxidized were characterized by XRD, SEM and EDS. Results show that the flow ability and loose density of MoSi2powder by sintered treatment, were 17.1 s/50g and 2.1g/cm3, respectively, ideal for air plasma spraying. During the course of spraying, some of molybdenum disilicide with a tetragonal lattice was converted into molybdenum disilicide with a hexagonal lattice. Also, part of MoSi2 phase oxidized and transformed to Mo5Si3phase. A relative dense molybdenum disilicide coating was prepared by air plasma spraying. A protective SiO2layer, seems to be glassy, with a thickness about 10 μm was formed on the surface of MoSi2coating during MoSi2coating oxidized at 1200°C for 200 h. The results of the oxidation tests show that MoSi2coating prepared by air plasma spraying may be provide a protect layer for high temperature structure material.

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Investigation of High Emissivity Coatings Prepared by Plasma Spraying

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.287-290.2283 ◽

2011 ◽

Vol 287-290 ◽

pp. 2283-2287

Author(s):

Can Wang ◽

Quan Sheng Wang ◽

Xian Jin Ning ◽

Zhong Du ◽

Yan Bo Liu ◽

...

Keyword(s):

Bond Strength ◽

Bulk Density ◽

Plasma Spraying ◽

Infrared Emissivity ◽

Air Plasma ◽

Air Plasma Spraying ◽

Feedstock Powder ◽

Plasma Sprayed ◽

Normal Emissivity ◽

High Emissivity

In this study, the feedstock powder for plasma spray was prepared by spray drying and post-sintering at 1360 °C using raw metal oxides. The high emissivity coating was deposited by air plasma spraying (APS). The microstructure, phase structure, flowability and bulk density of the plasma sprayed powder were characterized. The microstructure, bond strength and infrared emissivity of the high emissivity coating were also analyzed in this paper. The results reveal that the feedstock powder present good flowability of 42.36 (sp50g) with the bulk density of 1.94 gpml and is suitable for plasma spraying. A dense coating with the bond strength of 39.6MPa and the porosity less than 5 percent was prepared successfully. The normal emissivity of the coating in all waveband is 0.88 at 300°C and 0.87 at 600°C.

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