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.

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.

A review of applications of CT imaging on fiber reinforced composites

2021 ◽  
pp. 002199832110507
Author(s):  
Yantao Gao ◽  
Wenfeng Hu ◽  
Sanfa Xin ◽  
Lijuan Sun
Keyword(s):  
Mechanical Damage ◽  
Ceramic Matrix Composites ◽  
Ct Imaging ◽  
Fiber Reinforced Composites ◽  
Matrix Composites ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
X Ray ◽  
Materials Research ◽  
Physical And Chemical

With the development of X-ray computed tomography over the last few decades, it is gradually considered to be a powerful tool in the field of materials research. This paper presents a comprehensive review of applications of CT imaging on fiber reinforced composites, from polymer composites to ceramic matrix composites. The principle of X-ray CT and experimental tomography setups was described firstly. Then, in situ experimental devices developed in recent years were illustrated. Furthermore, the applications of X-ray CT imaging on manufacturing process, modeling, mechanical damage, physical, and chemical behaviors were reviewed in detail. Besides, advantages and limitations of X-ray CT imaging were pointed out and the future development was prospected.

Extraction, Treatment and Applications of Natural Fibers for Bio-Composites – A Critical Review

2021 ◽  
Vol 36 (2) ◽  
pp. 114-130
Author(s):  
S. Sathish ◽  
L. Prabhu ◽  
S. Gokulkumar ◽  
N. Karthi ◽  
D. Balaji ◽  
...  
Keyword(s):  
Chemical Treatment ◽  
Natural Fiber ◽  
Natural Fibers ◽  
Weight Ratio ◽  
Industrial Applications ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Complete Evaluation ◽  
Physical And Chemical

Abstract Nowadays, sustainable and eco-friendly products are gaining more attention in various engineering industries owing to their considerable strength-to-weight ratio, abundant availability, and recyclability. The properties of biofibers depend on the cultivation method, environmental conditions, and extraction method. Biofibers are hauled out by dew retting, water retting, and mechanical decortication methods. The properties of natural fiber–reinforced composites can be enhanced by proper physical and chemical treatments. The aim of this study is to propose a complete evaluation of the different extraction methods applied on natural fibers. Various physical and chemical treatment methods were used to ascertain the properties of optimized natural fiber-reinforced composites for various industrial applications. The key findings derived from various existing data and the chemical treatment results of the biofiber-reinforced composite are specifically highlighted with critical assessment. The properties and use of natural fiber-reinforced composites in the various fields of applications have made them candidates of choice over synthetic petroleum–based fibers.

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