Effect of PyC Content in C/C Greenbody on Structure and Properties of 3D-C/SiC Composite Fabricated by Gas Silicon Infiltration

2011 ◽  
Vol 71-78 ◽  
pp. 4994-4998
Author(s):  
Hui Yong Yang ◽  
Rong Jun Liu ◽  
Ying Bin Cao ◽  
Dong Lin
Keyword(s):  
Mechanical Properties ◽  
Carbon Fiber ◽  
Three Dimensional ◽  
X Ray Diffraction ◽  
Pull Out ◽  
Carbide Matrix ◽  
Variable Content ◽  
Sic Composites ◽  
Physical And Chemical ◽  
Polymer Infiltration

In order to fabricate high perform carbon fiber reinforced silicon carbide matrix composite (C/SiC). SiC interphase of three dimensional(3D) braided carbon fiber performs was prepared by polymer infiltration pyrolysis(PIP) using polycarbosilane(PCS) as precursor. Then, C/SiC composites were fabricated by gas silicon infiltration(GSI) at 1400～1700°C to C/C greenbody, which was prepared by PIP based on precursor of phenolic resin from one to four cycles. The influence of pyrocarbon(PyC) content in C/C greenbody on the composition, microstructure and mechanical properties of C/SiC composites was investigated via X-ray diffraction(XRD), scanning electron microscope (SEM), physical and chemical methods. The results indicate that there were β-SiC, residual Si ,C and closed pores in C/SiC, and the different pyrocarbon(PyC) content influenced C/SiC mechanical properties via the variable content of β-SiC, residual Si, C and closed pores. The C/SiC composites with 2 cycles of PIP-C, which had fitting relative content of β-SiC, residual Si and C, possessed the best mechanical properties. The flexure strength and flexure modulus were 187.3MPa and 66.5GPa. The β-SiC generated from PCS wrapped the carbon fiber bundles, protecting them from reacting with gaseous silicon. The phenomenon of ‘fibers pull-out’ was observed in all four groups of C/SiC composites, which manifested the mechanism of toughness fracture.

Effect of Silicon Carbide Interlayers on the Mechanical Behavior of T800-HB-Fiber-Reinforced Silicon Carbide-Matrix Composites

2008 ◽  
Vol 368-372 ◽  
pp. 1844-1846 ◽  
Author(s):  
Xin Gui Zhou ◽  
Hai Jiao Yu ◽  
Bo Yun Huang ◽  
Jian Gao Yang ◽  
Ze Lan Huang
Keyword(s):  
Mechanical Properties ◽  
Silicon Carbide ◽  
Three Dimensional ◽  
Bending Test ◽  
Matrix Composites ◽  
High Mechanical Strength ◽  
Three Point Bending ◽  
Carbide Matrix ◽  
Fiber Matrix ◽  
Sic Composites

The influence of the fiber/matrix interlayers on the mechanical properties of T800-HB fiber (a kind of carbon fiber) (the fibrous is three-dimensional four-directional braided) reinforced silicon carbide (SiC) matrix composites has been evaluated in this paper. The composites were fabricated through PIP process, and SiC layers were deposited as fiber/matrix interlayers by the isothermal CVD process. Fiber/matrix debonding and relatively long fiber pullouts were observed on the fracture surfaces. The mechanical properties were investigated using three-point bending test and single-edge notched beam test. The T800-HB/SiC composites exhibited high mechanical strength, and the flexural strength and fracture toughness were 511.5MPa and 20.8MPa•m1/2, respectively.

Effect of Pyrocarbon Pre-Coating on the Mechanical Properties of CVI Carbon Fiber/SiC Composites

1995 ◽  
Vol 32 (4) ◽  
pp. 369-371 ◽  
Author(s):  
Hiroshi ARAKI ◽  
Tetsuji NODA ◽  
Hiroshi SUZUKI ◽  
Fujio ABE ◽  
Masatoshi OKADA
Keyword(s):  
Mechanical Properties ◽  
Carbon Fiber ◽  
Sic Composites

scholarly journals Fabrication and Mechanical Properties of Reaction-Bonded Carbon Fiber/Si/SiC Composites.

1999 ◽  
Vol 107 (1252) ◽  
pp. 1123-1127
Author(s):  
Dong-Woo SHIN ◽  
Sam-Shik PARK ◽  
Hidehiko TANAKA ◽  
Koichi NIIHARA
Keyword(s):  
Mechanical Properties ◽  
Carbon Fiber ◽  
Sic Composites

scholarly journals Mechanical Properties and Failure Behavior of 3D-SiCf/SiC Composites with Different Interphases

Scanning ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-7
Author(s):  
Deng-hao Ma ◽  
En-ze Jin ◽  
Jun-ping Li ◽  
Zhen-hua Hou ◽  
Jian Yin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Silicon Carbide ◽  
Shear Strength ◽  
Ceramic Matrix Composites ◽  
Failure Behavior ◽  
Matrix Composites ◽  
Static Mechanical ◽  
Sic Composites ◽  
Polymer Infiltration ◽  
Static Mechanical Properties

Continuous silicon carbide fiber-reinforced silicon carbide ceramic matrix composites (SiCf/SiC) are promising as thermal structural materials. In this work, the microstructure and static mechanical properties of 3D-SiCf/SiC with PyC, SiC, and PyC/SiC and without an interface prepared via polymer infiltration and pyrolysis (PIP) were investigated systematically in this paper. The results show that the microstructure and static mechanical properties of SiCf/SiC with an interphase layer were superior to the composites without an interlayer, and the interface debondings are existing in the composite without an interphase, resulting in a weak interface bonding. When the interphase is introduced, the interfacial shear strength is improved, the crack can be deflected, and the fracture energy can be absorbed. Meanwhile, the shear strength of the composites with PyC and PyC/SiC interfaces was 118 MPa and 124 MPa, respectively, and showing little difference in bending properties. This indicates that the sublayer SiC of the PyC/SiC multilayer interface limits the binding state and the plastic deformation of PyC interphase, and it is helpful to improve the mechanical properties of SiCf/SiC.

scholarly journals Effect of Saturation and Post Processing on 3D Printed Calcium Phosphate Scaffolds

2008 ◽  
Vol 396-398 ◽  
pp. 663-666 ◽  
Author(s):  
Tamas D. Szucs ◽  
Dermot Brabazon
Keyword(s):  
Mechanical Properties ◽  
Calcium Phosphate ◽  
Sodium Phosphate ◽  
Three Dimensional ◽  
Surface Topology ◽  
Phosphate Solution ◽  
X Ray Diffraction ◽  
Three Dimensional Printing ◽  
Sodium Phosphate Solution ◽  
3D Printed

Three dimensional printing was investigated for fabricating hydroxyapatite (HA) and β-tricalcium phosphate (β-TCP) composite scaffolds using calcium phosphate based ceramics and calcium phosphate cement chemistry. Scaffolds were formed by printing an aqueous sodium phosphate solution on the powder bed consisting of a mixture of dicalcium phosphate anhydrous (DCPA) and calcium hydroxide powders. The sodium phosphate solution was functioning as a binder material and also as the initiator of the wet chemical reaction. Compressive mechanical properties of printed samples were examined as a function of saturation level that was inversely proportional to the powder to liquid ratio. To increase mechanical properties and obtain hydroxyapatite and β-TCP composites, the printed samples were sintered. The effect of sintering parameters including dwell time and sintering temperature were also examined. X-ray diffraction (XRD) was used to examine material composition at different stages of the manufacturing process and to confirm the presence of HA and β-TCP in the final stage. The effect of sintering procedure on the surface topology of the samples was examined using scanning electron microscopy (SEM).

Experimental Study on Ultrasonic Assisted Grinding of C/SiC Composites

2014 ◽  
Vol 620 ◽  
pp. 128-133 ◽  
Author(s):  
Kai Ding ◽  
Yu Can Fu ◽  
Hong Hua Su ◽  
Tao He ◽  
Xi Zhai Yu ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Brittle Fracture ◽  
Grinding Force ◽  
Specific Grinding Energy ◽  
Ultrasonic Assisted Grinding ◽  
Ultrasonic Assisted ◽  
Conventional Grinding ◽  
Carbide Matrix ◽  
Sic Composites ◽  
Material Removal Mode

In the present work, ultrasonic assisted grinding (UAG) and conventional grinding (CG, without ultrasonic) tests of Carbon fiber reinforced silicon carbide matrix (C/SiC) composites were conducted. In addition, analysis was done by comparing the machining quality, grinding force, and specific grinding energy between the two processes. The results showed that material removal mode of carbon fiber both in CG and UAG were brittle fracture, and fracture size had no obvious difference. Compared with CG, brittle fracture area of SiC increased during UAG. In comparison with CG, the normal grinding force and tangential grinding force for UAG were reduced maximally by 45%, 39% respectively of those for CG. Accordingly, specific grinding energy was also reduced by UAG. Therefore, UAG can improve the grinding performance of C/SiC composites significantly.

scholarly journals Parameters Affecting the Mechanical Properties of Three-Dimensional (3D) Printed Carbon Fiber-Reinforced Polylactide Composites

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2456
Author(s):  
Demei Lee ◽  
Guan-Yu Wu
Keyword(s):  
Mechanical Properties ◽  
Carbon Fiber ◽  
3D Printing ◽  
Three Dimensional ◽  
Fused Deposition Modelling ◽  
Layer By Layer ◽  
Fused Deposition ◽  
Bed Temperature ◽  
3D Printed ◽  
The Impact

Three-dimensional (3D) printing is a manufacturing technology which creates three-dimensional objects layer-by-layer or drop-by-drop with minimal material waste. Despite the fact that 3D printing is a versatile and adaptable process and has advantages in establishing complex and net-shaped structures over conventional manufacturing methods, the challenge remains in identifying the optimal parameters for the 3D printing process. This study investigated the influence of processing parameters on the mechanical properties of Fused Deposition Modelling (FDM)-printed carbon fiber-filled polylactide (CFR-PLA) composites by employing an orthogonal array model. After printing, the tensile and impact strengths of the printed composites were measured, and the effects of different parameters on these strengths were examined. The experimental results indicate that 3D-printed CFR-PLA showed a rougher surface morphology than virgin PLA. For the variables selected in this analysis, bed temperature was identified as the most influential parameter on the tensile strength of CFR-PLA-printed parts, while bed temperature and print orientation were the key parameters affecting the impact strengths of printed composites. The 45° orientation printed parts also showed superior mechanical strengths than the 90° printed parts.

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