scholarly journals Fabrication of fiber-reinforced composites by chemical vapor infiltration

1996 ◽  
Author(s):  
T M Besmann ◽  
W M Matlin ◽  
D P Stinton ◽  
P K Liaw
Keyword(s):  
Chemical Vapor ◽  
Chemical Vapor Infiltration ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Vapor Infiltration

Stacking Faults in SiCf/SiC Composite Obtained by Chemical Vapor Reaction Process

2008 ◽  
Vol 591-593 ◽  
pp. 583-587
Author(s):  
Marcio Florian ◽  
Rodrigo Fernando Costa Marques ◽  
Luiz Eduardo Carvalho ◽  
Carlos Alberto Alves Cairo ◽  
Nilso Barelli
Keyword(s):  
Stacking Faults ◽  
Chemical Vapor ◽  
Ceramic Materials ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Unit Cell Size ◽  
Sic Fiber ◽  
Card Number ◽  
Sic Ceramic

SiC fiber-reinforced SiC matrix composite (SiCf/SiC) is one of the leading candidates in ceramic materials for engineering applications due to its unique combination of properties such as high thermal conductivity, high resistance to corrosion and working conditions. Fiber-reinforced composites are materials which exhibit a significant improvement in properties like ductility in comparison to the monolithic SiC ceramic. The SiCf/SiC composite was obtained from a C/C composite precursor using convertion reaction under high temperature and controlled atmosphere. In this work, SiC phase presented the stacking faults in the structure, being not possible to calculate the unit cell size, symmetry and bond lengths but it seem equal card number 29-1129 of JCPDS.

Preparation of TiB2/C Composites in a CVI Reactor

2007 ◽  
Vol 334-335 ◽  
pp. 329-332 ◽  
Author(s):  
Min Ki Kim ◽  
Dong Phil Kim ◽  
Gui Yung Chung
Keyword(s):  
Reaction Time ◽  
Titanium Diboride ◽  
Arrhenius Plot ◽  
Chemical Vapor ◽  
Chemical Vapor Infiltration ◽  
Fiber Reinforced Composites ◽  
Temperature Reaction ◽  
Reinforced Composites ◽  
Attractive Candidate ◽  
Infiltration Parameters

Titanium diboride (TiB2) appears to be an attractive candidate for a high-temperature fiber reinforced composites. Chemical Vapor Infiltration (CVI) has been carried out for the preparation of TiB2/C composites. Titanium diboride has been deposited from the gas mixtures of TiCl4, BCl3, and H2 in the furnace at the reaction temperatures between 850 to 950 °C and about 20 torr. Effects of infiltration parameters such as temperature, reaction time, and concentrations of BCl3 and H2 have been studied. Analyses with SEM, TGA and XPS were carried out. The amount of deposition in the preform increased with the increases of the reaction time, temperature and the flow rate of BCl3. The activation energy of the whole deposition reaction could be estimated from the Arrhenius plot.

scholarly journals Yttria-Coated Tungsten Fibers for Use in Tungsten Fiber-Reinforced Composites: A Comparative Study on PVD vs. CVD Routes

Coatings ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1128
Author(s):  
Saravanan Palaniyappan ◽  
Maik Trautmann ◽  
Yiran Mao ◽  
Johann Riesch ◽  
Parikshith Gowda ◽  
...  
Keyword(s):  
Chemical Vapor ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Tungsten Fiber ◽  
Temperature Growth ◽  
Qualitative Nature ◽  
Phase And Chemical Composition ◽  
Physical And Chemical ◽  
Interface Materials

Tungsten fiber-reinforced tungsten (Wf/W) composites are being developed to improve the intrinsic brittleness of tungsten. In these composites, engineered fiber/matrix interfaces are crucial in order to realize toughening mechanisms. For such a purpose, yttria (Y2O3), being one of the suitable interface materials, could be realized through different coating techniques. In this study, the deposition of thin films of yttria on a 150 µm tungsten wire by physical and chemical vapor deposition (PVD and CVD) techniques is comparatively investigated. Although fabrication of yttria is feasible through both CVD and PVD routes, certain coating conditions such as temperature, growth rate, oxidation of Wf, etc., decide the qualitative nature of a coating to a particular extent. In the case of PVD, the oxidation of Wf is highly reduced compared to the WO3 formation in high-temperature CVD coating processes. Yttria-coated tungsten fibers are examined comprehensively to characterize their microstructure, phase, and chemical composition using SEM, XRD, and Raman spectroscopy techniques, respectively.

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