Effect of the Addition of Short Carbon Fiber on Thermal Insulation Properties of ZrB2- SiC Hot-Pressed Ceramics

2020 ◽  
Vol 993 ◽  
pp. 785-790
Author(s):  
Lin Kai He ◽  
You Hong Sun ◽  
Mei Jun Liu ◽  
Qing Nan Meng
Keyword(s):  
Carbon Fiber ◽  
Thermal Insulation ◽  
Carbon Fibers ◽  
Interfacial Thermal Resistance ◽  
Sintering Process ◽  
Short Carbon Fiber ◽  
Sic Ceramics ◽  
Hot Pressing Sintering ◽  
Insulation Performance ◽  
Short Carbon

Short carbon fibers reinforced ZrB2-SiC ceramics were prepared by hot pressing sintering process. The short carbon fibers with different volume fractions (0.2.4.6.8.10.20) were added for improving the thermal insulation properties of ZrB2-SiC ceramics. The experimental results showed that as the content of short carbon fiber increased, the thermal diffusivity decreased from 43.9m2/s to 32.9m2/s, the thermal conductivity decreased from 104.3 W/(m·K) to 72.9 W/(m·K) and thermal insulation performance reduced by 43.1%, respectively. The enhancement of the thermal insulation properties is mainly due to high interfacial thermal resistance of short carbon fiber and matrix.

A Study on Mechanical Properties of Short Carbon Fiber Reinforced Polycarbonate via an Injection Molding Process

2020 ◽  
Vol 18 (11) ◽  
pp. 801-805
Author(s):  
Kyung-Soo Jeon ◽  
R. Nirmala ◽  
Seong-Hwa Hong ◽  
Yong-II Chung ◽  
R. Navamathavan ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Carbon Fiber ◽  
Carbon Fibers ◽  
Testing Machine ◽  
Fiber Content ◽  
Injection Molding Process ◽  
Mechanical And Thermal Properties ◽  
Molding Process ◽  
Short Carbon Fiber ◽  
Short Carbon

This manuscript is dealt with the synthesis of short carbon fibers reinforced polycarbonate polymer composite by using injection modeling technique. Four different composite materials were obtained by varying the carbon fibers weight percentage of 10, 20, 30 and 40%. The synthesized carbon fibers/polycarbonate composites were characterized for their morphological, mechanical and thermal properties by means of scanning electron microscopy (SEM), universal testing machine (UTM) and IZOD strength test. The resultant carbon fibers/polycarbonate composites exhibited excellent interfacial adhesion between carbon fibers and polycarbonate resin. The tensile properties were observed to be monotonically increases with increasing carbon fiber content in the composite resin. The tensile strength of carbon fiber/polycarbonate composites with the carbon fiber content 40% were increased about 8 times than that of the pristine polycarbonate matrix. The carbon fibers/polycarbonate composites with 40 wt.% of short carbon fibers exhibited a high tensile strength and thermal conductivity. The incorporation of carbon fiber in to polycarbonate resin resulted in a significant enhancement in the mechanical and the thermal behavior. These studies suggested that the short carbon fiber incorporated polycarbonate composite matrix is a good candidate material for many technological applications.

Fracture Parameters of Short Carbon Fiber Reinforced Polycarbonate Composite Fabricated by Injection Molding Process

2015 ◽  
Vol 776 ◽  
pp. 186-192
Author(s):  
Myung Goo Hwang ◽  
Gin Ho Kim ◽  
Han Ju Park ◽  
Yong Gon Lee ◽  
Cheol Min Yang ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Injection Molding ◽  
Carbon Fibers ◽  
Weld Line ◽  
Micro Ct ◽  
Fiber Reinforced ◽  
Short Carbon Fiber ◽  
Injection Process ◽  
Carbon Fiber Reinforced ◽  
Short Carbon

This paper investigated the fracture behavior of the unavoidable breakage of carbon fibers and fiber orientation of short carbon fiber reinforced polycarbonate composite in injection process. In this experiment, short carbon fiber mixed compound of 1mm, 3mm, 5mm, 7mm length with 10wt.%, 15wt.%, 20wt.% in polycarbonate for injection molding were produced through the extruder. The dumbbell specimens for tensile evaluation were made by injection molding. The parent specimens were made by double gate method, the weld specimens were made by single gate method which was controlled by inserting a stopper through the runner of the mold cavity. Short carbon fiber reinforced PC composite was evaluated by micro-CT with regard to the particle size of short fiber with a diversified quantitative analysis through entire process of the injection process in composite. The quantitative distribution of fiber orientation was also examined by micro-CT with regard to normal direction or anisotropy. Weld line of short carbon fibers reinforced PC composite weaken the bonding strength by 50% compared to parent materials because the weld line is composed with concentrated anisotropy orientation of short carbon fiber in weld line. Evaluation of the mechanical properties of the injection specimens group was utilized by universal tensile strength tester. In addition, fracture surface of parent and weld materials was investigated by a SEM.

Wear and Mechanical Properties of Short Carbon Fiber Reinforced Copper Matrix Composites

2011 ◽  
Vol 474-476 ◽  
pp. 1605-1610 ◽  
Author(s):  
Lian Wei Yang ◽  
Yun Dong ◽  
Rui Jie Wang
Keyword(s):  
Mechanical Properties ◽  
Carbon Fiber ◽  
Carbon Fibers ◽  
Adhesive Wear ◽  
Copper Matrix ◽  
Matrix Composites ◽  
Fiber Reinforced ◽  
Short Carbon Fiber ◽  
Copper Matrix Composites ◽  
Short Carbon

The mechanical properties and wear behavior of short carbon fiber reinforced copper matrix composites was studied. In order to avoid any interfacial pronlems in the carbon fibre reinforced composites, the carbon fibers were coated with copper. The fibers were coated by electroless coating method and then characterized. Composites containing different amounts of carbon fibers were prepared by hot pressing technique. The results show that Carbon fiber/Cu–Ni–Fe composites showed higher hardness, higher wear resistance and bending strength than the common copper alloy when carbon fibers content is less than 15 vol.%. The predominant wear mechanisms were identified as adhesive wear in the alloy and adhesive wear accompanied with oxidative wear in the 12 vol.% carbon fiber/Cu–Ni–Fe composites.

Mechanical Properties and Microstructure of Short Carbon Fiber Reinforced Hydroxyapatite Bio-Composite

2011 ◽  
Vol 685 ◽  
pp. 357-361 ◽  
Author(s):  
Xin Guang Wang ◽  
Wan Li Gu ◽  
Zong Wei Niu
Keyword(s):  
Mechanical Properties ◽  
Carbon Fiber ◽  
Fracture Surface ◽  
Mass Fraction ◽  
Flexural Modulus ◽  
Short Carbon Fiber ◽  
Hot Pressing Sintering ◽  
Surface Morphologies ◽  
Short Carbon

The short carbon fiber (Cf) reinforced hydroxyapatite (HA) bio-composite was prepared by an in-situ processing. Mechanical properties and microstructure of Cf/HA were investigated. Structures of HA was analyzed using XRD and fracture surface morphologies of bio-composite were analyzed using SEM. Result shows that grain size of HA under hot pressing sintering (1423K, 35MPa) grow up to approximately 50nm. Bio-composite exhibits excellent mechanical properties when Cfmass fraction is 3%, whose flexural strength and flexural modulus reach the maximum values of 130MPa and 36GPa which surpass common level of nature bone. SEM fracture surface morphologies of Cf/HA shows Cfcan be uniformly dispersed in the HA matrix when the mass fraction less than 6%, while when the mass fraction is11%, partial aggregation appears.

Short Carbon Fiber-Reinforced Epoxy Tribomaterials Self-Lubricated by Wax Containing Microcapsules

2014 ◽  
Vol 81 (12) ◽  
Author(s):  
Nay Win Khun ◽  
He Zhang ◽  
Xiu-zhi Tang ◽  
Chee Yoon Yue ◽  
Jinglei Yang
Keyword(s):  
Carbon Fiber ◽  
Mechanical Strength ◽  
Carbon Fibers ◽  
Tribological Properties ◽  
Friction And Wear ◽  
Tribological Performance ◽  
Epoxy Composites ◽  
Short Carbon Fiber ◽  
The Core ◽  
Short Carbon

The effects of wax lubricant filled microcapsule content on the tribological properties of epoxy composites without or with 8 wt.% short carbon fibers (SCFs) were systematically investigated. The core percentage of the microcapsules used in this study was about 70 wt.%. The tribological results clearly showed that the friction and wear of the epoxy composites without or with SCFs tested against a 6 mm steel ball significantly decreased with increased microcapsule content from 2.5 to 10 wt.% as a result of the increased amount of released wax lubricant to lubricate rubbing surfaces. The epoxy composites with 8 wt.% SCFs exhibited the lower friction and wear than the ones without SCFs due to the combined lubricating effects of SCFs and released wax lubricant and the improved mechanical strength of the composites. It can be concluded that the higher microcapsule content gives rise to the lower friction and wear of the epoxy composites as the epoxy composites with 8 wt.% SCFs have the better tribological performance than the ones without SCFs.

Oxidation of Short Carbon Fiber Reinforced ZrB2-SiC Ceramics under Atmospheric and Oxyacetylene Torch Conditions

2008 ◽  
Vol 368-372 ◽  
pp. 1753-1755 ◽  
Author(s):  
Fei Yu Yang ◽  
Xing Hong Zhang ◽  
Shan Yi Du
Keyword(s):  
Carbon Fiber ◽  
Thin Layer ◽  
Cross Section ◽  
Oxidation Behavior ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Short Carbon Fiber ◽  
Average Mass ◽  
Sic Ceramics ◽  
Short Carbon

The oxidation behavior of ZrB2-20 vol.% SiC (ZS) and ZrB2-20 vol.% SiC containing 20 vol.% short carbon fiber (ZSC) was studied using thermal gravimetric analysis and oxyacetylene torch test. It was shown that weight gains changed from 3.71 wt.% for ZS to 4.57 wt.% for ZSC after heating 10°C /min to 1450°C in air. A thin layer of Si-rich glass and then a depletion layer of SiC was found on the cross section of both materials and carbon fiber of ZSC exposed in air was oxidized. Under oxyacetylene, an average mass loss of 0.8 wt.% for ZS and 0.9 wt.% for ZSC was measured after 180 seconds. After exposure, an oxidized layer with the formation of ZrO2 and SiO2 was found on the surface of both materials. Meanwhile, fiber in the surface of ZSC appeared oxidized and removed.

MECHANICAL PROPERTIES AND FRACTURE BEHAVIOR OF ELECTROLESS NI-PLATED SHORT CARBON FIBER REINFORCED GEOPOLYMER MATRIX COMPOSITES

2009 ◽  
Vol 23 (06n07) ◽  
pp. 1371-1376 ◽  
Author(s):  
TIESONG LIN ◽  
DECHANG JIA
Keyword(s):  
Carbon Fiber ◽  
Carbon Fibers ◽  
Coating Thickness ◽  
Matrix Composites ◽  
Fiber Reinforced ◽  
Short Carbon Fiber ◽  
Geopolymer Matrix ◽  
Carbon Fiber Reinforced ◽  
Electroless Ni ◽  
Short Carbon

Electroless Ni -plated short carbon fiber reinforced geopolymer matrix composites with various carbon fiber/matrix interface coating thicknesses have been successfully fabricated. The influences of coating thickness on the mechanical properties and fracture behavior have been investigated by three-point bending test and scanning electron microscopy. The flexural strength and Young's modulus of Ni -plated short carbon fiber reinforced geopolymer composites exhibit maximums as the average fiber coating thickness increases, but the work of fracture has a sharp decrease, and the fracture manner changes from ductile to brittle. This is mainly attributed to the fact that the carbon fibers favor breakage rather than pulling-out during loading because of the higher interface bonding strength of fiber/matrix, and pliability of the carbon fibers decreases with the increase of the coating thickness.

scholarly journals Overmolding of Hybrid Long and Short Carbon Fiber Polypropylene Composite: Optimizing Processing Parameters

2021 ◽  
Vol 5 (4) ◽  
pp. 132
Author(s):  
Cahyo Budiyantoro ◽  
Heru S. B. Rochardjo ◽  
Gesang Nugroho
Keyword(s):  
Carbon Fiber ◽  
Impact Strength ◽  
Flexural Strength ◽  
Melting Temperature ◽  
Carbon Fibers ◽  
Volume Fraction ◽  
Injection Molding Process ◽  
Molding Process ◽  
Short Carbon Fiber ◽  
Short Carbon

Injection overmolding was used to produce hybrid unidirectional continuous-short carbon fiber reinforced polypropylene. Polypropylene pellets containing short carbon fibers were melted and overmolded on unidirectional carbon fibers, which act as the core of the composite structure. Four factors were varied in this study: fiber pretension applied to unidirectional fibers, injection pressure, melting temperature, and backpressure used for melting and injecting the composite pellet. This study aimed to evaluate the effect of these factors on fiber volume fraction, flexural strength, and impact strength of the hybrid composite. The relationship between factors and responses was analyzed using Box–Behnken Response Surface Methodology (RSM) and analysis of variance (ANOVA). Each aspect was divided into three levels. There were 27 experimental runs carried out, with three replicated center points. The results showed that the injection molding process parameters had no significant effect on the fiber’s volume fraction. On the other hand, melting temperature and fiber pretension significantly affected impact strength and flexural strength.

Effects of Carbon Fiber Dispersion on Bending Property of Cf/SiC Brake Materials

2012 ◽  
Vol 512-515 ◽  
pp. 793-797
Author(s):  
Bo Lin He ◽  
Ying Xia Yu ◽  
Jia Sun ◽  
Jing Liu ◽  
Jian Ping Shi
Keyword(s):  
Carbon Fiber ◽  
Carbon Fibers ◽  
Fiber Bundle ◽  
Bending Strength ◽  
Interfacial Strength ◽  
Production Costs ◽  
Fiber Dispersion ◽  
Short Carbon Fiber ◽  
Carbon Fiber Felt ◽  
Short Carbon

With increasing of the speed of the train, the requirement of the performance of the braking friction materials is more and more higher. It is urgent to find new braking materials to satisfy the rigorous using environment. Cf/SiC has the broad application prospects when it is used as a new kind of braking material. On this article, in order to shorten preparation cycle and reduced production costs, short carbon fiber is substituted continuous carbon fiber felt. Cf/SiC brake materials were prepared by the way of molding compression-pressureless sintering with resin binder. The effect of short carbon fiber dispersion on bending properties of brake materials was researched. The experimental results show that the bending strength of Cf/SiC brake materials, which manufactured by dispersing short carbon fibers, is higher than the composites manufactured by using fiber bundle. When the distribution of carbon fiber in composites is in single fiber state, the interfacial strength between carbon fibers and matrix were increased. At the experimental condition, compared to the sample with fiber bundle, the bending strength of the specimen with dispersed fiber is increased 40.79%. The toughening mechanism of carbon fiber debonding and fiber pull were generated in the process of bending fracture. The fracture model of composites is pseudo-ductile type.

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