scholarly journals The Oxidation of SiC Fiber and SiC Fiber Reinforced Boron Phenolic Resin Composite

2021 ◽  
Vol 2101 (1) ◽  
pp. 012083
Author(s):  
Li Wan ◽  
Chuang Dong ◽  
Ying Wang ◽  
Minxian Shi
Keyword(s):  
High Temperature ◽  
Cross Section ◽  
Phenolic Resin ◽  
Resin Composite ◽  
Fiber Surface ◽  
Fiber Reinforced ◽  
Molding Process ◽  
Thermal Stabilities ◽  
Sic Fiber ◽  
The Cross

Abstract The SiC fiber was thermally treated in air atmosphere and the SiC fiber reinforced boron phenolic resin composite was prepared by hot molding process by introducing inorganic ceramic particles. The thermal stabilities, the surface microstructures, the diameter and oxygen mental content variations, and the crystal structures of SiC fiber heated and kept for 0.5 h and 1h at different high temperatures were investigated through TG, SEM, XRD analysis. The cross-section morphology of the composite also observed. The results showed that the SiC fiber had good thermal resistance at high temperature in N2, however it was easy to be oxidized at high temperature in air. When heated from 25 °C to 1600 °C and kept for 1 h, the fiber was oxidized to SiO2 and the fiber surface was coarse and cracked. With the temperature increasing, the diameter of the fiber decreased and the oxygen content increased. Highly different form the cross-section morphology of SiC fiber itself heated in air, the cross-section morphology of SiC fiber in composite was weakly oxidized and the cross section was smooth and there was no distinct oxidation layer existing.

Flexural capacity and design of hybrid FRP-steel-reinforced concrete beams

2019 ◽  
Vol 23 (7) ◽  
pp. 1290-1304
Author(s):  
Yang Yang ◽  
Ze-Yang Sun ◽  
Gang Wu ◽  
Da-Fu Cao ◽  
Zhi-Qin Zhang
Keyword(s):  
Reinforced Concrete ◽  
Cross Section ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Hybrid Fiber ◽  
Steel Reinforced Concrete ◽  
Reinforced Polymer ◽  
The Cross

This study presents a design method for hybrid fiber-reinforced-polymer-steel-reinforced concrete beams by an optimized analysis of the cross section. First, the relationships among the energy consumption, the bearing capacity, and the reinforcement ratio are analyzed; then, the parameters of the cross section are determined. Comparisons between the available theoretical and experimental results show that the designed hybrid fiber-reinforced-polymer-steel-reinforced concrete beams with a low area ratio between the fiber-reinforced polymer and the steel reinforcement could meet the required carrying capacity and exhibited high ductility.

scholarly journals Thermochemical properties of liquid alloys along xCu/xSb= 0.2/08 section of the ternary Cu-Sb-Ce system

2017 ◽  
Vol 5 (2) ◽  
pp. 24-29 ◽  
Author(s):  
Natalia Kotova ◽  
Michael Ivanov ◽  
Natalia Usenko
Keyword(s):  
Experimental Data ◽  
High Temperature ◽  
Cross Section ◽  
Analytical Method ◽  
Composition Dependence ◽  
Liquid Alloys ◽  
Thermochemical Properties ◽  
Enthalpies Of Mixing ◽  
The Cross ◽  
Toop Model

The enthalpies of mixing of liquid alloys of the ternary Cu–Sb–Ce system were studied by high-temperature calorimetry along the cross-section = 0.2/0.8. The composition dependence of these values were modelled using four "geometric" models and also the analytical method of Redlich–Kister–Muggianu. A comparison of the experimental data for the cross section = 0.2/0.8 and simulated values of the enthalpies of mixing showed that the most suitable for describing the properties of liquid alloys of ternary Cu–Sb–Ce system is the Toop model.

A high-temperature structural and wave-absorbing SiC fiber reinforced Si3N4 matrix composites

2020 ◽  
Author(s):  
Ran Mo ◽  
Fang Ye ◽  
Xiaofei Liu ◽  
Qian Zhou ◽  
Xiaomeng Fan ◽  
...  
Keyword(s):  
High Temperature ◽  
Matrix Composites ◽  
Fiber Reinforced ◽  
Sic Fiber ◽  
Si3n4 Matrix

scholarly journals Strong and Thermostable Boron-Containing Phenolic Resin-Derived Carbon Modified Three-Dimensional Needled Carbon Fiber Reinforced Silicon Oxycarbide Composites with Tunable High-Performance Microwave Absorption Properties

2020 ◽  
Vol 10 (6) ◽  
pp. 1924 ◽  
Author(s):  
Yu Sun ◽  
Yuguo Sun
Keyword(s):  
High Temperature ◽  
Carbon Fiber ◽  
High Temperature Oxidation ◽  
Phenolic Resin ◽  
Three Dimensional ◽  
Silicon Oxycarbide ◽  
Fiber Reinforced ◽  
Absorption Properties ◽  
Temperature Oxidation ◽  
Carbon Fiber Reinforced

This paper focuses on the preparation of boron-containing phenolic resin (BPR)-derived carbon modified three-dimensional (3D) needled carbon fiber reinforced silicon oxycarbide (SiOC) composites through a simple precursor infiltration and pyrolysis process (PIP), and the influence of PIP cycle numbers on the microstructure, mechanical, high-temperature oxidation resistance. The electromagnetic wave (EMW) absorption properties of the composites were investigated for the first time. The pyrolysis temperature played an important role in the structural evolution of the SiOC precursor, as temperatures above 1400 °C would cause phase separation of the SiOC and the formation of silicon carbide (SiC), silica (SiO2), and carbon. The density and compressive strength of the composites increased as the PIP cycle number increased: the value for the sample with 3 PIP cycles was 0.77 g/cm3, 7.18 ± 1.92 MPa in XY direction and 9.01 ± 1.25 MPa in Z direction, respectively. This composite presented excellent high-temperature oxidation resistance and thermal stability properties with weight retention above 95% up to 1000 °C both under air and Ar atmosphere. The minimal reflection loss (RLmin) value and the widest effective absorption bandwidth (EAB) value of as-prepared composites was −24.31 dB and 4.9 GHz under the optimization condition for the sample with 3 PIP cycles. The above results indicate that our BPR-derived carbon modified 3D needled carbon fiber reinforced SiOC composites could be considered as a promising material for practical applications.

Effect of fiber coating on the mechanical behavior of SiC fiber-reinforced titanium aluminide composites

1993 ◽  
Vol 8 (4) ◽  
pp. 905-916 ◽  
Author(s):  
S.M. Jeng ◽  
J-M. Yang ◽  
J.A. Graves
Keyword(s):  
Mechanical Behavior ◽  
Titanium Aluminide ◽  
Effective Diffusion ◽  
Fiber Surface ◽  
Model Material ◽  
Matrix Composites ◽  
Fiber Reinforced ◽  
Fiber Coating ◽  
Sic Fiber

The effects of fiber surface coatings on the mechanical behavior and damage mechanisms of SCS-6 fiber-reinforced titanium aluminide matrix composites have been studied. Two different coating layers are used as model material: a brittle TiB2 and a ductile Ag/Ta duplex layer. The role of the coating layer on the interfacial reaction, interfacial properties, and mechanical behavior of the composites was characterized. Results indicate that both TiB2 and Ag/Ta are effective diffusion barriers in preventing fiber/matrix interfacial reactions during composite consolidation. However, the deformation mechanisms and crack propagation characteristics in these two coated composites are quite different. The criteria for selecting an improved interlayer to tailor a strong and tough fiber-reinforced titanium aluminide matrix composite are also discussed.

Observation of fatigue damage process in SiC fiber-reinforced Ti-15-3 composite at high temperature

1999 ◽  
Vol 30 (1) ◽  
pp. 221-229 ◽  
Author(s):  
Y. Tanaka ◽  
C. Masuda ◽  
Y. -F. Liu ◽  
Y. Kagawa ◽  
S. Q. Guo
Keyword(s):  
High Temperature ◽  
Fatigue Damage ◽  
Fiber Reinforced ◽  
Sic Fiber ◽  
Damage Process
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