Effects of heat treatment on the microstructure of amorphous boron carbide coating deposited on graphite substrates by chemical vapor deposition

2010 ◽  
Vol 519 (1) ◽  
pp. 251-258 ◽  
Author(s):  
Siwei Li ◽  
Bin Zeng ◽  
Zude Feng ◽  
Yongsheng Liu ◽  
Wenbin Yang ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Chemical Vapor Deposition ◽  
Boron Carbide ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Amorphous Boron ◽  
Carbide Coating

scholarly journals Machine learning and a computational fluid dynamic approach to estimate phase composition of chemical vapor deposition boron carbide

2021 ◽  
Vol 10 (3) ◽  
pp. 537-550
Author(s):  
Qingfeng Zeng ◽  
Yong Gao ◽  
Kang Guan ◽  
Jiantao Liu ◽  
Zhiqiang Feng
Keyword(s):  
Phase Composition ◽  
Chemical Vapor Deposition ◽  
Boron Carbide ◽  
Computational Fluid Dynamic ◽  
Vapor Deposition ◽  
Fluid Dynamic ◽  
Chemical Vapor ◽  
Sensitivity Coefficient ◽  
Design Solution ◽  
Novel Approach

AbstractChemical vapor deposition is an important method for the preparation of boron carbide. Knowledge of the correlation between the phase composition of the deposit and the deposition conditions (temperature, inlet gas composition, total pressure, reactor configuration, and total flow rate) has not been completely determined. In this work, a novel approach to identify the kinetic mechanisms for the deposit composition is presented. Machine leaning (ML) and computational fluid dynamic (CFD) techniques are utilized to identify core factors that influence the deposit composition. It has been shown that ML, combined with CFD, can reduce the prediction error from about 25% to 7%, compared with the ML approach alone. The sensitivity coefficient study shows that BHCl2 and BCl3 produce the most boron atoms, while C2H4 and CH4 are the main sources of carbon atoms. The new approach can accurately predict the deposited boron–carbon ratio and provide a new design solution for other multi-element systems.

Al 2 O 3 hollow nanospheres prepared by fluidized bed chemical vapor deposition and further heat treatment

2019 ◽  
Vol 102 (11) ◽  
pp. 6463-6468 ◽  
Author(s):  
Jian Zhao ◽  
Malin Liu ◽  
Jiaxing Chang ◽  
Youlin Shao ◽  
Bing Liu ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Chemical Vapor Deposition ◽  
Fluidized Bed ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Hollow Nanospheres

Aluminizing for TiAl turbocharger rotor by reduced pressure metal-organic chemical vapor deposition (RPMOCVD) and the efficiency of its oxidation resistance

1994 ◽  
Vol 9 (8) ◽  
pp. 1984-1989 ◽  
Author(s):  
Takakazu Suzuki ◽  
Hiroyuki Umehara ◽  
Haruki Hino
Keyword(s):  
Heat Treatment ◽  
Chemical Vapor Deposition ◽  
Oxidation Resistance ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Turbine Rotor ◽  
Organic Chemical ◽  
Reduced Pressure ◽  
Metal Organic ◽  
Organic Chemical Vapor Deposition

A complex-shaped TiAl turbine rotor has been uniformly aluminized by a metal-organic chemical vapor deposition under reduced pressure (RPMOCVD), and a thick TiAl3 layer, which affects the oxidation resistance, can be formed on the surface by subsequent heat treatment. The oxidation resistance has been studied with an oxidation test at 1173 K for 760 ks in static air. The microstructure has been investigated by SEM, EPMA, AES, and XRD. A heat treatment at above 933 K, which is the melting point of Al, is required to enhance the oxidation resistance of TiAl. With increasing the surface roughness of TiAl, the formation of TiAl3 increases, and consequently the oxidation resistance is more improved.

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