scholarly journals Introduction of nano-laminate Ti3SiC2 and SiC phases into Cf-C composite by liquid silicon infiltration method

10.30544/260 ◽  
2017 ◽  
Vol 23 (1) ◽  
pp. 21-30 ◽  
Author(s):  
Omid Yaghobizadeh ◽  
Arman Sedghi ◽  
Hamid Reza Baharvandi
Keyword(s):  
Bending Strength ◽  
Interlaminar Shear Strength ◽  
Liquid Silicon ◽  
Max Phase ◽  
High Temperature Application ◽  
Laminated Structure ◽  
Temperature Application ◽  
Interlaminar Shear ◽  
Sic Composites ◽  
Infiltration Method

The material Cf-C-SiC-Ti3SiC2 is promising for high temperature application. Due to the laminated structure and special properties, the Ti3SiC2 is one of the best reinforcements for Cf-C-SiC composites. In this paper, Cf-C-SiC-Ti3SiC2 composites were fabricated by liquid silicon infiltration (LSI) method; the effect of the TiC amount on the various composites properties were studied. For samples with 0, 50 and 90 vol.% of TiC, the results show that bending strength are 168, 190, and 181 MPa; porosities are 3.2, 4.7, and 9%; the fracture toughness are 6.1, 8.9, and 7.8 MPa∙m1/2; interlaminar shear strength are 27, 36, and 30 MPa; the amount of the MAX phase are 0, 8.5, and 5.6 vol.%, respectively. These results show that amount of TiC is not the main effective parameter in synthesis of Ti3SiC2. The existence of carbon promotes the synthesis of Ti3SiC2 indicating that only sufficient carbon content can lead to the appearance of Ti3SiC2 in the LSI process.

Effect of Needling Parameters on Mechanical Properties of C/C Composites Reinforced by Carbon Cloth

2007 ◽  
Vol 546-549 ◽  
pp. 1521-1524
Author(s):  
Xiao Hu Zhang ◽  
He Jun Li ◽  
Zhi Biao Hao ◽  
Hong Cui
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Shear Strength ◽  
Compression Strength ◽  
Bending Strength ◽  
Interlaminar Shear Strength ◽  
Carbon Cloth ◽  
Depth Range ◽  
Needle Punching ◽  
Interlaminar Shear

The influence of needling parameters on mechanical properties of carbon-carbon (C-C)composites reinforced by needled carbon cloth was studied in the present investigation. The results showed that needling density (ND)and needle-punching depth (PD) both had a larger effect on interlaminar shear strength (ILSS) than on compression strength and flexible strength of Needling C-C(NC-C). The mechanical properties of NC-C increased with increasing punching density in the range of 20-45 punch/cm2 and also with increasing punching depth range from10 to16mm. The NC-C with the highest ND value of 55punch/cm2 had highest ILSS value of 27 MPa.The optimized ND and PD parameters was 30 punch/cm2 and 12mm respectively, which resulted in a high value of tensile strength(119MPa), bending strength (220MPa) and compression strength (235 MPa) in the X-Y direction .

scholarly journals Effect of Sewing Threads on Interlaminar Shear Strength and Flexural Bending Strength of Stitched Non-Crimp Carbon Fabric Laminates

2006 ◽  
Vol 15 (6) ◽  
pp. 096369350601500
Author(s):  
Peter Mitschang ◽  
Amol Ogale
Keyword(s):  
Shear Strength ◽  
Carbon Fibre ◽  
Bending Strength ◽  
Positive Influence ◽  
Interlaminar Shear Strength ◽  
Cfrp Laminates ◽  
Short Beam ◽  
Carbon Fibre Reinforced Polymer ◽  
Interlaminar Shear ◽  
Sewing Threads

Interlaminar shear strength and flexural bending strength of stitched and non-stitched carbon fibre reinforced polymer (CFRP) laminates were studied with reference to three different sewing threads. The preforms were stitched through-the-thickness by two different hybrid carbon fibre threads and a Zylon (polyphenylen-2,6-benzobisoxazol, PBO) thread with 16 stitches/cm2 stitch density. The short beam interlaminar shear strength of the laminate increases where as flexural bending strength of the laminate shows mixed results depending on the stitching direction. Carbon fibre threads show relatively less positive influence on the laminate properties than the PBO thread. The results of this study differ partly from the literature studies.

Synthesis and properties of a novel silicon-containing phthalonitrile resin and its quartz-fiber-reinforced composites

2020 ◽  
Vol 32 (10) ◽  
pp. 1112-1121
Author(s):  
Junjie Hu ◽  
Yanhong Hu ◽  
Shi Feng Deng ◽  
Jia li Zhou ◽  
Ning Jiang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Bending Strength ◽  
Weight Ratio ◽  
Thermomechanical Properties ◽  
Interlaminar Shear Strength ◽  
Proton Nuclear Magnetic Resonance ◽  
Quartz Fiber ◽  
Scanning Calorimetry ◽  
Interlaminar Shear

A novel silicon-containing phthalonitrile monomer named bis(4-(4′-(4′-phenoxy)phenyl)phenyl)dimethylsilane phthalonitrile (SiBPPN) was successfully designed and synthesized. The chemical structure was characterized by proton nuclear magnetic resonance and Fourier transform infrared (FTIR) analyses, and its molecular weight was determined by mass spectrometry. Its melting point is lower than that of 4,4′-bis(3,4-dicyanophenoxy)biphenyl (BPPN), which has no silicon atom, and its solubility is also much better than that of BPPN. The curing behavior of SiBPPN was studied by differential scanning calorimetry and FTIR analyses in detail. The thermal and thermomechanical properties of the polymer and laminate were studied by thermogravimetric analysis and dynamic mechanical analysis. The results show that the cured SiBPPN (c-SiBPPN) possesses excellent thermal and mechanical properties. Under nitrogen atmosphere, its residual weight ratio at 800°C is 81.5% and the 5% thermal degradation temperature is 546°C. In addition, quartz-fiber (QF)-reinforced c-SiBPPN composites exhibit mechanical properties superior to those of QF-reinforced cured BPPN composites. The interlaminar shear strength and bending strength of the composite are 30.44 and 389 MPa at room temperature, and the interlaminar shear strength and bending strength of the composite are 22.25 and 339 MPa at 300°C.

Spring and piston system for high temperature application

1997 ◽  
Author(s):  
R. Spivey ◽  
S. Breeding ◽  
J. Andrews ◽  
D. Stefanescu ◽  
S. Sen ◽  
...  
Keyword(s):  
High Temperature ◽  
High Temperature Application ◽  
Piston System ◽  
Temperature Application

Mechanical properties of multiwall carbon nanotubes/unidirectional carbon fiber-reinforced epoxy hybrid nanocomposites in transverse and longitudinal fiber directions

2021 ◽  
pp. 096739112098651
Author(s):  
Saeedeh Saadatyar ◽  
Mohammad Hosain Beheshty ◽  
Razi Sahraeian
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Epoxy Resin ◽  
Interlaminar Shear Strength ◽  
Lap Shear Strength ◽  
Transverse Tensile ◽  
Lap Shear ◽  
Longitudinal Fiber ◽  
Interlaminar Shear ◽  
Multiwall Carbon

Unidirectional carbon fiber-reinforced epoxy (UCFRE) is suffering from weak transverse mechanical properties and through-thickness properties. The effect of different amount (0.1, 0.3 and 0.5 phr which is proportional to 0.09, 0.27 and 0.46 wt%, respectively) of multiwall carbon nanotube (MWCNT), on transverse tensile properties, flexural strength, fracture toughness in transverse and longitudinal fiber directions, interlaminar shear strength and lap shear strength of UCFRE has been investigated. Dicyandiamide was used as a thermal curing agent of epoxy resin. MWCNT was dispersed in the epoxy resin by ultrasonic instrument and their dispersion state was investigated by scanning electron microscopy (SEM). The curing behavior of epoxy resin and its nanocomposites was assessed by differential scanning calorimetry. Results show that transverse tensile strength, modulus and strain-at-break were increased by 28.5%, 25% and 14%, respectively by adding 0.1 phr of MWCNT. Longitudinal flexural properties of UCFRE was not changed by adding different amount of MWCNT. Although longitudinal flexural strength was increased by 5% by adding 0.1 phr of MWCNT. Fracture toughness in transverse and longitudinal fiber directions was increased by 39% and 9%, respectively at 0.3 phr of MWCNT. Results also show that interlaminar shear strength and lap shear strength were increased at 0.3 phr of MWCNT by 8% and 5%, respectively. These increases in mechanical properties were due to the good adhesion of fibers to the matrix, interlocking and toughening action of MWCNT as revealed by SEM.

Effect of consolidation force on interlaminar shear strength of CF/PEEK laminates manufactured by laser-assisted forming

2021 ◽  
Vol 266 ◽  
pp. 113779
Author(s):  
Qiuyu Miao ◽  
Zhihong Dai ◽  
Guangyi Ma ◽  
Fangyong Niu ◽  
Dongjiang Wu
Keyword(s):  
Shear Strength ◽  
Interlaminar Shear Strength ◽  
Interlaminar Shear

High-Temperature Brazing Molybdenum

2012 ◽  
Vol 586 ◽  
pp. 69-73
Author(s):  
Chia Chen Lin ◽  
Cheng Han Lee ◽  
Ren Kae Shiue ◽  
Hsiou Jeng Shy
Keyword(s):  
High Temperature ◽  
Intermetallic Phase ◽  
High Temperature Application ◽  
Three Point Bending ◽  
Brazed Joints ◽  
Temperature Application ◽  
Titanium Foils

High-temperature brazing molybdenum using palladium and titanium foils have been investigated in the experiment. Successful brazed joints are achieved from using the palladium filler foil. Brazed joints are fully dense and free of any intermetallic phase. Three point bending strengths of 246 and 233 MPa are obtained from joints using 100 m thick palladium filler foil brazed at 1580 and 1610 oC for 600 s, respectively. The application of palladium filler foil shows potential in brazing molybdenum for high-temperature application.

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