scholarly journals Liquid Silicon Infiltrated SiCf/SiC Composites with Various Types of SiC Fiber

2017 ◽  
Vol 30 (2) ◽  
pp. 77-83 ◽  
Author(s):  
Jong Seob Song ◽  
Seyoung Kim ◽  
Kyeong Ho Baik ◽  
Sangkuk Woo ◽  
Soo-hyun Kim
Keyword(s):  
Liquid Silicon ◽  
Sic Fiber ◽  
Sic Composites

Stress, Strain and Elastic Modulus Behaviour of SiC-Fiber/SiC Composites during Creep and Cyclic Fatigue Tests

1997 ◽  
Vol 132-136 ◽  
pp. 1942-1945 ◽  
Author(s):  
Mineo Mizuno ◽  
Shijie Zhu ◽  
Yutaka Kagawa ◽  
Hiroshi Kaya
Keyword(s):  
Elastic Modulus ◽  
Cyclic Fatigue ◽  
Fatigue Tests ◽  
Stress Strain ◽  
Sic Fiber ◽  
Sic Composites

Application of Electrophoretic Deposition for Interfacial Control of High-Performance SiC Fiber-Reinforced SiC Matrix (SiCf/SiC) Composites

2014 ◽  
pp. 1448-1463 ◽  
Author(s):  
Katsumi Yoshida
Keyword(s):  
Mechanical Properties ◽  
Electrophoretic Deposition ◽  
High Performance ◽  
Carbon Coating ◽  
Interfacial Debonding ◽  
Fabrication Process ◽  
The Novel ◽  
Fiber Pullout ◽  
Sic Fiber ◽  
Sic Composites

This chapter reviews the novel fabrication process of continuous SiCf­/SiC composites based on electrophoretic deposition (EPD). EPD process is very effective for achieving relatively homogeneous carbon coating with the thickness of several tens to hundreds nanometers on SiC fibers. Carbon interface with the thickness of at least 100 nm formed by EPD acts effectively for inducing interfacial debonding and fiber pullout during fracture, and the SiCf­/SiC composites show excellent mechanical properties. From these results, it is demonstrated that the fabrication process based on EPD method is expected to be an effective way to control the interfaces of SiCf­/SiC composites and to obtain high-performance SiCf­/SiC composites.

Strong Interface in CMCs, a Condition for Efficient Multilayered Interphases

1994 ◽  
Vol 365 ◽  
Author(s):  
Christine Droillard ◽  
Jacques Lamon ◽  
Xavier Bourrat
Keyword(s):  
Fracture Toughness ◽  
Bonding Strength ◽  
High Strength ◽  
Interfacial Behavior ◽  
Strain Behavior ◽  
High Toughness ◽  
Sic Fiber ◽  
Sliding Mechanism ◽  
Fiber Treatment ◽  
Sic Composites

ABSTRACTA fiber treatment was used to change the bonding strength of the Nicalon NLM 202 SiC fiber from weak to strong, in a series of 2D-SiC/SiC composites with multilayered interphases. The materials with the pre-treated fibers were compared to the same materials but reinforced with as received fibers. The stress-strain behavior and the fracture toughness were examined as a function of crack patterns identified by TEM. All the materials could be grouped into two distinct families: (i) materials reinforced with untreated fibers have a weak fiber bonding and are characterized by a low strength and a low toughness and (2) materials with the pre-treated fibers have a strong fiber bonding and are characterized by a high strength and a high toughness. This latter behavior is identified by TEM. It corresponds to a new interfacial behavior with a cohesive mode of interfacial cracking, involving branching and deflection by the successive interfaces. In the former family, the adhesive interfacial failure mode corresponds to the classical debond/sliding mechanism.

Emissivity of Silicon Carbide Composites as a Function of Temperature and Microstructure

1995 ◽  
Vol 410 ◽  
Author(s):  
Ming Sun ◽  
Isabel K. Lloyd
Keyword(s):  
Oxide Layer ◽  
Intelligent Control ◽  
Chemical Vapor ◽  
Sample Surface ◽  
Spectral Emissivity ◽  
Chemical Vapor Infiltration ◽  
Layer Formation ◽  
Microwave Assisted ◽  
Sic Fiber ◽  
Sic Composites

ABSTRACTSpectral emissivity normal to the sample surface was investigated as a potential intelligent control parameter for the manufacture of SiC fiber reinforced SiC composites by chemical vapor infiltration (CVI) and microwave assisted CVI. Results indicated that at temperatures between 600 and 1000°C and wavelengths between 1500 and 2100 nm emissivity was sensitive to the sample porosity. It also appeared to be sensitive to the thickness of the oxide layer on the composites. The emissivity was not very sensitive to temperature in this region. It was concluded that emissivity is promising as a probe of density during manufacturing. It may also be useful as a probe of oxide layer formation.

Influences of Thermal Molding Process on the Flexural Properties of SiC/SiC Composites with a New Precursor Polymer

2015 ◽  
Vol 816 ◽  
pp. 33-39
Author(s):  
Zheng Luo ◽  
Xin Gui Zhou ◽  
Jin Shan Yu ◽  
Fei Wang
Keyword(s):  
Fracture Toughness ◽  
Silicon Carbide ◽  
Molding Pressure ◽  
Flexural Properties ◽  
Cross Linking ◽  
Matrix Composites ◽  
Molding Process ◽  
Sic Fiber ◽  
Precursor Polymer ◽  
Sic Composites

Silicon carbide (SiC) fiber reinforced SiC matrix composites (SiC/SiC) were fabricated by precursor impregnation and pyrolysis (PIP) process with a new precursor polymer, liquid polyvinylcarbosilane (LPVCS). The molding process was conducted during the cross-linking reactions of LPVCS for the first PIP cycle. The influences of molding pressure and molding time on the flexure properties of the SiC/SiC composites were studied. The results indicated that the optimal molding pressure and molding time were 3MPa and 5h respectively due to the fine interfacial bonding between fiber and matrix. The density of the SiC/SiC composites was 2.16g/cm3. The flexural strength and fracture toughness of the SiC/SiC composites were 637.5MPa and 29.8MPa·m1/2 respectively.

Development of a SiNx-Based Barrier Coating for SiC Fibres

2015 ◽  
Vol 825-826 ◽  
pp. 256-263 ◽  
Author(s):  
Kristina Roder ◽  
Daisy Nestler ◽  
Daniel Wett ◽  
Bernd Mainzer ◽  
Martin Frieß ◽  
...  
Keyword(s):  
Coating Thickness ◽  
Vapour Deposition ◽  
Chemical Vapour ◽  
Liquid Silicon ◽  
Barrier Coating ◽  
Fibre Coating ◽  
Variable Chemical ◽  
Pressure Chemical ◽  
Sic Composites ◽  
The Stability

Uncoated SiC fibres in SiC/SiC composites manufactured by the liquid-silicon infiltration (LSI) process show a strong degradation as a result of silicon attack. The goal of this research is the development of a SiNx-based fibre coating, which acts as a barrier against the liquid silicon. The coating is applied by means of low-pressure chemical vapour deposition (LPCVD) utilising the gaseous precursors silane (SiH4) and ammonia (NH3) on a commercial SiC multifilament yarn. The result is an amorphous fibre coating with an increasing coating thickness and a variable chemical composition from the middle of the yarn to the edges. The coated fibres exhibit a reduced characteristic Weibull strength in comparison to the uncoated fibres. In order to examine the stability of the films, the coated fibres undergo a heat treatment at 1450 °C in different environments (vacuum, argon and nitrogen). In all environments, the amorphous SiNxcoatings crystallise to the trigonal Si3N4. Depending on the coating thickness cracks and defects develop. However, the best results and the lowest amount of damaging occurs during the treatment in nitrogen.

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