Preparation and Properties of C/SiC Composites via Liquid Silicon Infiltration Process

Three-dimensional short carbon fiber felt reinforced C/SiC composites were prepared by the liquid silicon infiltration (LSI) process. The influences of different porosity ratios, carbon coating, and heat treatment of C/C substrates, on the properties of C/SiC composites were studied. The optimized porosity ratio is calculated as 40.1% when the volume percent of carbon fiber (including carbon coating) is 23%, and after screening porosity ratio from ~55% to ~20%, the optimized experimental result (39.5%) is highly in accordance with the design value. The C/SiC composite after process parameter optimization, has a flexural strength and modulus of 125 MPa and 120 GPa, respectively. The C/SiC composite without carbon coating has a flexural strength of only 77 MPa, showing carbon coating plays a key role. The heat treatment of C/C substrate at 1600°C also improves the flexural strength of C/SiC composite for nearly 50%, and porosity rearrangement and interface weakening are believed to contribute such improvement.

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The Evaluation of Thermoplastic Precursors for C/C-SiC Manufactured by Liquid Silicon Infiltration (LSI)

Materials Science Forum ◽

10.4028/www.scientific.net/msf.825-826.232 ◽

2015 ◽

Vol 825-826 ◽

pp. 232-239 ◽

Cited By ~ 1

Author(s):

Florian Reichert ◽

Nico Langhof ◽

Walter Krenkel

Keyword(s):

Carbon Fiber ◽

Flexural Strength ◽

Phenolic Resin ◽

Nitrogen Atmosphere ◽

Liquid Silicon ◽

Infiltration Process ◽

Bending Tests ◽

Pretreatment Temperature ◽

Fiber Matrix ◽

Sic Composites

C/C-SiC composites, fabricated by the Liquid Silicon Infiltration process (LSI), typically use phenolic resin-based thermosets as carbon precursors. In contrast to this, two different thermoplastics (Polyetheretherketone PEEK and Polyetherimide PEI) were examined for their suitability as carbon precursors for C/C-SiC composites. The carbon fiber surfaces were pretreated between 400 °C and 800 °C in nitrogen atmosphere to modify the fiber/matrix bonding. The microstructures of the materials show an increasing SiC content with increasing fiber pretreatment temperature. The flexural strength of the resulting material was determined by 4-point-bending tests.

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Effects of Carbon Fiber Architecture on the Microstructure and Mechanical Property of C/C-SiC Composites

Materials Science Forum ◽

10.4028/www.scientific.net/msf.658.133 ◽

2010 ◽

Vol 658 ◽

pp. 133-136 ◽

Cited By ~ 3

Author(s):

Ji Ping Wang ◽

Jian Yong Lou ◽

Zhuo Xu ◽

Zhi Hao Jin ◽

Guan Jun Qiao

Keyword(s):

Mechanical Property ◽

Carbon Fiber ◽

Flexural Strength ◽

Thermal Gradient ◽

Chemical Vapor ◽

Chemical Vapor Infiltration ◽

Fiber Architecture ◽

Carbon Fiber Felt ◽

Sic Composites ◽

Microstructure And Mechanical Property

C/C-SiC composites were rapidly fabricated by a two-steps processing. Firstly a short-cut carbon fiber felt (SC) and a 2D carbon fiber felt (2D) were densified to C/C composites by a thermal gradient chemical vapor infiltration (CVI) method with vaporized kerosene as a precursor in 2h, 3h, 4h and 5h, respectively. Then the C/C composites were infiltrated and reacted with melting silicon to obtain C/C-SiC composites. The results show that, with increase of the CVI time, the densities of the two types of C/C-SiC composites decrease in the range of 2.28g/cm3 to 2.00g/cm3; their porosities increase ranging from 1.3% to 7.5%; the contents of the β-SiC and the unreacted Si phases in the composites decline. The flexural strength of the 2D_C/C-SiC composite is much higher than that of the SC_C/C-SiC composite when prepared in the same condition.

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Online-Joining of C/SiC-C/SiC via Slurry Reaction and Precursor Infiltration and Pyrolysis Process with C/SiC Pins

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.531-532.135 ◽

2012 ◽

Vol 531-532 ◽

pp. 135-140 ◽

Cited By ~ 1

Author(s):

Yu Di Zhang ◽

Hai Feng Hu ◽

Chang Rui Zhang ◽

Guang De Li

Keyword(s):

Shear Strength ◽

Carbon Fiber ◽

Flexural Strength ◽

Fracture Mode ◽

Pyrolysis Process ◽

Strong Bond ◽

Sic Composites ◽

Maximum Shear Strength ◽

Application Prospects ◽

Complex Components

C/SiC composites have widely application prospects in the field of aeronautic and aerospace for their excellent properties. The joining of C/SiC composites is a key to fabricate large and complex components. In this paper, 1D C/SiC pins were prepared by precursor infiltration and pyrolysis (PIP) process and used to join C/SiC composites by Slurry react (SR) and PIP process. The shear strength of the C/SiC pins with different carbon fiber volumes was investigated with the maximum shear strength as high as 339.46MPa. Influences of C/SiC pins on the joining properties of C/SiC composites were studied. The shear strength and flexural strength of C/SiC-C/SiC joining are improved from 9.17MPa and 30.41MPa without pins to 20.06MPa and 75.03MPa with one C/SiC pin (diameter 2mm), respectively. The reliability of C/SiC-C/SiC joining is also improved with C/SiC pins in that the fracture mode changes from catastrophic without pins to non-catastrophic. The SEM photos show a strong bond between joining layer and C/SiC composites without obvious interface.

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Preparation and Properties of 2D C/SiC Composites by CLVD Processing

Materials Science Forum ◽

10.4028/www.scientific.net/msf.675-677.779 ◽

2011 ◽

Vol 675-677 ◽

pp. 779-782 ◽

Cited By ~ 1

Author(s):

Si’an Chen ◽

Hai Feng Hu ◽

Chang Rui Zhang ◽

Yu Di Zhang ◽

Xin Bo He ◽

...

Keyword(s):

Carbon Fiber ◽

Flexural Strength ◽

Induction Heating ◽

Vapor Deposition ◽

Flexural Modulus ◽

Fiber Bundles ◽

Xrd Pattern ◽

Carbon Fiber Cloth ◽

The Matrix ◽

Sic Composites

Chemical liquid-vapor deposition (CLVD) process is a new style of fast densification, which combines the advantages of PIP process and CVI process. 2D C/SiC composites were prepared at 800~1200°C for 3~4 hours with liquid polycarbosilane and carbon fiber cloth by CLVD process with induction heating, and had the density of 1.7 g/cm3, the flexural strength of 84.6MPa, and the flexural modulus of 20GPa. XRD pattern of the sample proved that the matrix was β-SiC. It was found that SiC deposited mainly around single fiber instead of among fiber bundles and layers.

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Influence of heat treatment temperature of carbon fiber felt substrate on polyaniline electrosynthesis and its properties

Journal of Solid State Electrochemistry ◽

10.1007/s10008-018-4107-8 ◽

2018 ◽

Vol 23 (1) ◽

pp. 33-52 ◽

Cited By ~ 3

Author(s):

Anne Karoline dos Santos Poli ◽

Rodrigo Barbosa Hilário ◽

Adriana Medeiros Gama ◽

Mauricio Ribeiro Baldan ◽

Emerson Sarmento Gonçalves

Keyword(s):

Heat Treatment ◽

Carbon Fiber ◽

Heat Treatment Temperature ◽

Treatment Temperature ◽

Carbon Fiber Felt

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Oxidation Resistant Behaviour of Mullite/Yttrium Silicate Multilayer Coating for C/SiC Composites at 1500°C

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.602-603.430 ◽

2014 ◽

Vol 602-603 ◽

pp. 430-433 ◽

Cited By ~ 2

Author(s):

Shuang Zhao ◽

Xin Gui Zhou ◽

Hong Lei Wang

Keyword(s):

Heat Treatment ◽

Silicon Carbide ◽

Weight Loss ◽

Flexural Strength ◽

Multilayer Coating ◽

Yttrium Silicate ◽

Spray Method ◽

Oxidation Resistant ◽

Sic Composites ◽

Original Strength

Continuous carbon fibre reinforced silicon carbide (C/SiC) composites were fabricated by precursor infiltration and pyrolysis (PIP) process, a mullite/yttrium silicate multilayer coating was prepared by plasma spray method as the oxidation protective coating. The efficiency of the coating against oxidation was characterized by means of heat treatment of the C/SiC composites at 1500 °C in static air for 1 hour. The results indicated that the weight loss of the coated composites was only 3.4 %, and the flexural strength of the composites retained 95.3 % of the original strength.

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Effect of Heat Treatment on the Microstructure and Mechanical Properties of Cf/SiC Composites

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.336-338.1291 ◽

2007 ◽

Vol 336-338 ◽

pp. 1291-1293

Author(s):

Xin Gui Zhou ◽

Chang Cheng Zhou ◽

Chang Rui Zhang ◽

Ying Bin Cao ◽

Shi Qin Zou

Keyword(s):

Mechanical Properties ◽

Heat Treatment ◽

Fracture Toughness ◽

Silicon Carbide ◽

Shear Strength ◽

Carbon Fiber ◽

Vapor Deposition ◽

Chemical Vapor ◽

Carbon Coatings ◽

Sic Composites

3D braided carbon fiber reinforced silicon carbide (3D-Cf/SiC) composites were fabricated by precursor infiltration and pyrolysis(PIP), with carbon coatings prepared by chemical vapor deposition (CVD) before PIP. The effect of 1873K heat treatment on the mechanical properties of Cf/SiC composites were investigated. The results showed that heat treatment before PIP can increase the density of composites and lead to excellent properties of Cf/SiC composites. The flexual strength of the Cf/SiC composites with one cycle of 1873 K heat treatment reached 571 MPa, shear strength 51 MPa, and fracture toughness 18 MPa⋅m1/2.

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Flexural Properties of T700 2D Cf/SiC Composites via Precursor Infiltration and Pyrolysis

Materials Science Forum ◽

10.4028/www.scientific.net/msf.816.152 ◽

2015 ◽

Vol 816 ◽

pp. 152-156

Author(s):

Xin Ma ◽

Xin Bo He ◽

Hai Feng Hu ◽

Yu Di Zhang ◽

Yong Li

Keyword(s):

Mechanical Properties ◽

Carbon Fiber ◽

Flexural Strength ◽

Rough Surface ◽

Load Transfer ◽

Flexural Modulus ◽

Flexural Properties ◽

Internal Defects ◽

Plain Weave ◽

Sic Composites

2D Cf/SiC composites were prepared by precursor infiltration and pyrolysis (PIP) process with spreaded T700-12K plain weave carbon clothes as the reinforcement. The mechanical properties and microstructures were investigated. The composites are compact with few internal defects since the precursor could infiltrate the preform effectively. CVD-PyC interface modified the surface of T700 carbon fiber, a rough surface is helpful for the interfacial combination and the load transfer. For the Cf/PyC/SiC composites, the flexural strength and flexural modulus were 425±23.2 MPa and 36.3±3.1 GPa, respectively.

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