Pitch-based carbon fiber reinforced cements: structure, performance, applications, and research needs

1992 ◽  
Vol 19 (1) ◽  
pp. 26-38 ◽  
Author(s):  
Nemkumar Banthia
Keyword(s):  
Carbon Fiber ◽  
Physical Properties ◽  
Mechanical Behavior ◽  
Key Words ◽  
Carbon Fibers ◽  
Fiber Reinforcement ◽  
Performance Characteristics ◽  
Future Research ◽  
Cement Composites ◽  
Research Needs

The improvements in the performance characteristics of cements due to carbon fiber reinforcement are described. In particular, the structure, the physical properties, the mechanical behavior, and the durability aspects of carbon–cement composites using pitch-based fibers are discussed. The various possible applications of these composites in structural and nonstructural applications are enumerated. The future research needs are identified. Key words: cements, carbon fibers, microstructure, strength, toughness, durability, applications.

scholarly journals Reconstruction of Ovine Trachea with a Biomimetic Composite Biomaterial

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Wojciech Ścierski ◽  
Grażyna Lisowska ◽  
Grzegorz Namysłowski ◽  
Maciej Misiołek ◽  
Jan Pilch ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Carbon Fibers ◽  
Nonwoven Fabric ◽  
Woven Fabric ◽  
Future Research ◽  
Histological Structure ◽  
Tracheal Reconstruction ◽  
Medical Needs ◽  
Forms Of Carbon

The aim of this study was to evaluate a novel composite material for tracheal reconstruction in an ovine model. A polymer containing various forms of carbon fibers (roving, woven, and nonwoven fabric) impregnated with polysulfone (PSU) was used to create cylindrical tracheal implants, 3 cm in length and 2.5 cm in diameter. Each implant, reinforced with five rings made of PSU-impregnated carbon-fiber roving, had three external layers made of carbon-fiber woven fabric and the inner layer formed of carbon-fiber nonwoven fabric. The inner surface of five implants was additionally coated with polyurethane (PU), to promote migration of respiratory epithelium. The implants were used to repair tracheal defects (involving four tracheal rings) in 10 sheep (9-12 months of age; 40-50 kg body weight). Macroscopic and microscopic characteristics of the implants and tracheal anastomoses were examined 4 and 24 weeks after implantation. At the end of the follow-up period, outer surfaces of the implants were covered with the tissue which to various degree resembled histological structure of normal tracheal wall. In turn, inner surfaces of the prostheses were covered only with vascularized connective tissue. Inner polyurethane coating did not improve the outcomes of tracheal reconstruction and promoted excessive granulation, which contributed to moderate to severe stenosis at the tracheal anastomoses. The hereby presented preliminary findings constitute a valuable source of data for future research on a tracheal implant being optimally adjusted for medical needs.

Mechanical behavior of unidirectional carbon fiber-reinforced polyamide 6 composites under transverse tension and the structure of polyamide 6 among carbon fibers

2020 ◽  
Vol 52 (10) ◽  
pp. 1195-1201 ◽  
Author(s):  
Hideyuki Uematsu ◽  
Daisuke Kurita ◽  
Shota Nakakubo ◽  
Ayaka Yamaguchi ◽  
Masachika Yamane ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Mechanical Behavior ◽  
Carbon Fibers ◽  
Polyamide 6 ◽  
Fiber Reinforced ◽  
Transverse Tension ◽  
Carbon Fiber Reinforced

Mechanical behavior of multilayer GO carbon-fiber cement composites

2018 ◽  
Vol 159 ◽  
pp. 205-212 ◽  
Author(s):  
Zeng-shun Chen ◽  
Xiao Zhou ◽  
Xu Wang ◽  
Peng Guo
Keyword(s):  
Carbon Fiber ◽  
Mechanical Behavior ◽  
Cement Composites

scholarly journals Current overview of carbon fiber: Toward green sustainable raw materials

BioResources ◽  
2020 ◽  
Vol 15 (3) ◽  
pp. 7234-7259
Author(s):  
Yongjian Xu ◽  
Yan Liu ◽  
Shenglin Chen ◽  
Yonghao Ni
Keyword(s):  
Carbon Fiber ◽  
Carbon Fibers ◽  
Melt Spinning ◽  
Raw Materials ◽  
Future Research ◽  
Process Conditions ◽  
Preparation Methods ◽  
Advantages And Disadvantages ◽  
Solution Spinning ◽  
And Performance

Lignin, as a potential precursor of carbon fiber, has the characteristics of abundant reserves, renewable and high carbon content, and its application in the preparation of carbon fibers has substantial cost advantages if some important processing and quality hurdles can be overcome. This paper reviews the preparation process of lignin-based carbon fibers, and moreover, describes the characteristics of carbon fiber prepared by different precursors compared with the presently used precursors. Three preparation methods for lignin-based carbon fibers are introduced: melt spinning, solution spinning, and electrospinning. The applicability, advantages, and disadvantages of the three preparation methods are analyzed from the aspects of process conditions and performance characteristics. Possible directions for future research are considered, with the goal of providing a reference for further study of lignin-based carbon fibers.

Processing-Microstructure-Tensile Property of Vapor Grown Carbon Fiber Reinforced Carbon Composite

1995 ◽  
Vol 383 ◽  
Author(s):  
Jyh-Ming Ting
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Carbon Fiber ◽  
Physical Properties ◽  
Tensile Properties ◽  
Gas Phase ◽  
Thermal Management ◽  
Carbon Fibers ◽  
Carbon Composite ◽  
Carbon Composites

ABSTRACTIn contrast to the form in which other carbon fibers are produced, vapor grown carbon fiber (VGCF) is produced from gas phase precursors in the form of individual fibers of discrete lengths. VGCF can be harvested as a mat of semi-aligned, semicontinuous fibers, with occasional fiber branching and curling. The use of VGCF mats as reinforcement result in composites which exhibit unique microstructure and physical properties that are not observed in other types of carbon composites. This paper describes the processing of VGCF mats reinforced carbon composites, and its unique microstructure and properties. Utilization of fiber tensile properties, as well as thermal conductivity, in the composites is discussed. Comparison of experimental results from various VGCF composites to theory indicates that mechanical properties are more strongly affected by characteristics of VGCF mat than are thermal conductivity. The implications of this relationship favors applications for thermal management where structural demands are less stringent.

Experiment and Finite Element Analysis of Partially Prestressed with Non-Bonded Fiber Reinforcement Polymer Tendon under Four Points

2013 ◽  
Vol 838-841 ◽  
pp. 416-423
Author(s):  
Ya Min Yi ◽  
Dong Hui Cheng
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Carbon Fiber ◽  
Mechanical Behavior ◽  
Concrete Beams ◽  
Fiber Reinforcement ◽  
Element Analysis ◽  
Concrete Members ◽  
Carbon Fiber Reinforcement ◽  
Good Agreement

Carbon fiber reinforcement polymer could be used to replace steel tendon to bear loads together with concrete to solve the problem of steel tendon corrosion in concrete members. To study mechanical behavior of this kind of member, four concrete beams of partially prestressed with non-bonded carbon fiber reinforcement tendon were fabricated. In these beams, the reinforcement was taken as non prestressed tendon and carbon fiber reinforcement polymer tendon was taken as non-bonded prestressed tendon. Four points bending experiment were completed. Then the mechanical behavior of these beams has been studied through finite element analysis. The results show that a good agreement between experimental and finite element analysis results.

Modification Process of Carbon Fiber Reinforcement for Aluminum Matrix Composite

2012 ◽  
Vol 560-561 ◽  
pp. 899-905
Author(s):  
Xiao Fang Liu ◽  
Ping Li ◽  
Zhong Xia Liu
Keyword(s):  
Carbon Fiber ◽  
Carbon Fibers ◽  
Matrix Composite ◽  
Large Scale ◽  
Ph Value ◽  
Aluminum Matrix ◽  
Fiber Reinforcement ◽  
Aluminum Matrix Composite ◽  
Modification Process ◽  
Carbon Fiber Reinforcement

Modification process of carbon fiber reinforcement was investigated so as to produce aluminum matrix composite on a large scale. A series of pretreatment technologies could acquire chemical deposition silver, which became the base of copperplating on the surface of carbon fibers. The optimum conditions of electroless plating copper, including components, adding amount of carbon fibers, temperature, pH value, and mixing method, were determined to obtain a perfect copper layer on the surface of carbon fibers. The control of copper deposition and repeating utilization of many technology solutions were realized to reduce the costs. The results laid a foundation of mass production for carbon fiber reinforced aluminum matrix composite.

Mechanical Properties of Cement Composites Reinforced by Carbon Microfibers: Compressive and Bending Strength

2016 ◽  
Vol 722 ◽  
pp. 351-356 ◽  
Author(s):  
Pavel Tesárek ◽  
Petr Holub ◽  
Jan Havrda ◽  
Jozef Fládr ◽  
Zdeněk Prošek ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Physical Properties ◽  
Carbon Fibers ◽  
Bending Strength ◽  
Experimental Testing ◽  
Concrete Mixture ◽  
Cement Composites ◽  
Mechanical And Physical Properties ◽  
Carbon Microfibers ◽  
Destructive Methods

The paper deals with comparison of chosen mechanical properties of cement composites reinforced by carbon microfibers. There are tested three mixtures, which are different in their composition. Each sample was tested by destructive methods to determine their mechanical and physical properties. The main object of experiments was verification of an influence of individual components in concrete mixture on mixture cohesion with a surface of carbon fibers. Evaluation of results and use of the best concrete mixture for experimental testing like a change of mechanical and physical properties is the second object of this paper.

High Resolution Microscopy of Carbon Fibers

1970 ◽  
Vol 28 ◽  
pp. 468-469
Author(s):  
David F. Harling
Keyword(s):  
High Resolution ◽  
Carbon Fiber ◽  
Physical Properties ◽  
Carbon Fibers ◽  
Structural Composites ◽  
The Past ◽  
Reinforcing Material ◽  
High Resolution Microscopy

Much interest has been shown over the past few years in carbon fibers, a novel reinforcing material included in the growing field of structural composites. Typical carbon fiber products can easily match the physical properties of steel but with only one-fifth the weight. These unusual properties are attributed to the microstructure of the fibers and the orientation of extremely long graphitic crystallites more or less parallel to the long axis of the fiber. Variations in fiber strengths have been attributed to, among other things, voids between these crystallites.

Understanding Limited Use of Amplification in Infants and Children Who Are Hard of Hearing

2015 ◽  
Vol 25 (1) ◽  
pp. 15-23 ◽  
Author(s):  
Ryan W. McCreery ◽  
Elizabeth A. Walker ◽  
Meredith Spratford
Keyword(s):  
Hard Of Hearing ◽  
Hearing Aid ◽  
Management Strategies ◽  
Infants And Children ◽  
Future Research ◽  
Research Needs ◽  
Case Examples ◽  
Hearing Aid Use ◽  
Wide Range ◽  
In Infants And Children

The effectiveness of amplification for infants and children can be mediated by how much the child uses the device. Existing research suggests that establishing hearing aid use can be challenging. A wide range of factors can influence hearing aid use in children, including the child's age, degree of hearing loss, and socioeconomic status. Audiological interventions, including using validated prescriptive approaches and verification, performing on-going training and orientation, and communicating with caregivers about hearing aid use can also increase hearing aid use by infants and children. Case examples are used to highlight the factors that influence hearing aid use. Potential management strategies and future research needs are also discussed.

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