Development and characterization of carbon-carbon composite for aircraft brake pad using preformed yarn method (original) (raw)
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Impact and Flexural Strengths of Carbon-Carbon Composites Prepared by Preformed Yarn Method
Carbon-carbon composites, due to their unique properties like high specific strength, stiffness and in plane toughness as well as refractory properties like retention of mechanical properties at extremely high temperatures of the order of 3000 o C, find application as structural materials in space vehicles, heat shields, rocket nozzles and aircraft brakes. Properties like biocompatibility and chemical inertness have led to new applications in medicine industry. Advanced fabrication techniques like Preformed Yarn (PY) method showed exceptional values for specific strength and fracture toughness than conventional methods already available.
UHTC–carbon fibre composites: Preparation, oxyacetylene torch testing and characterisation
Journal of the European Ceramic Society, 2013
Current generation carbon-carbon (C-C) and carbon-silicon carbide (C-SiC) materials are limited to service temperatures below 1800°C and materials are sought that can withstand higher temperatures and ablative conditions for aerospace applications. One potential materials solution is carbon fiber-based composites with matrices composed of one or more ultra high temperature ceramics (UHTCs); the latter are intended to protect the carbon fibers at high temperatures whilst the former provides increased toughness and thermal shock resistance to the system as a whole. Carbon fiber-UHTC powder composites have been prepared via a slurry impregnation and pyrolysis route. Five different UHTC compositions have been used for impregnation, viz. ZrB 2 , ZrB 2-20 vol% SiC, ZrB 2-20 vol% SiC-10 vol% LaB 6 , HfB 2 and HfC. Their high-temperature oxidation resistance has been studied using a purpose built oxyacetylene torch test facility at temperatures above 2500°C and the results are compared with that of a CC 2 benchmark composite. 1 The oxidation products have been characterized using various techniques and the results show that hafnium diboride-based UHTC composites offered the greatest resistance to ultra high temperature oxidation.
Manufacture and characterisation of a low cost carbon fibre reinforced C/SiC dual matrix composite
Carbon, 2006
A porous two-dimensional C/C composite was produced via the polymer pyrolysis route using phenolic resin as the matrix precursor and polyacrilonitrile-(PAN-) or pitch-based carbon fibres as reinforcement. The resulting C/C composites were then densified using a modified polysilane followed by pyrolysis to convert the polymer into silicon carbide, sealing the pores in the C/C composite. Aiming to increase the ceramic yield of the infiltrated polysilane and to reduce its volumetric shrinkage during pyrolysis the polymer's curing behaviour was modified by catalytic addition of 0.1% dicobaltoctacarbonyl [Co 2 (CO) 8 ]. The densification procedure is very efficient in sealing cracks in the C/C composite with SiC. The obtained carbon fibre reinforced C/SiC dual matrix composites were subjected to flexural tests and dynamic mechanical analysis. The flexural and visco-elastic properties of the composite are dominated by the strength of the fibre/ matrix interface rather than by the fibre strength or modulus. A correlation between the mechanical loss factor (tan d) and the fracture behaviour of the composite is suggested.
Investigation of Mechanical Properties in Silicon Carbide-Filled Carbon Fiber Composites
2020
The main aim of the present research is to investigate the mechanical properties (hardness, tensile strength, tensile modulus, flexural strength, flexural modulus, inter-laminar shear strength, and impact strength) of unfilled carbon reinforcement fiber composites and SiC-filled carbon reinforcement fiber composites and to identify the best combination in terms of wt% of filler, matrix, and reinforcement for best mechanical properties. The results revealed that SiC-filled carbon reinforcement fiber composite with 10 wt% of SiC particulates has been exhibited by the better mechanical properties among all fabricated unfilled carbon reinforcement fiber composites and SiC-filled carbon reinforcement fiber composites.
Studies on Fibre Orientation of Carbon Fibre Preforms for Fabrication of C/SiC Fasteners
Transactions of the Indian National Academy of Engineering
Continuous carbon fibre-reinforced silicon carbide (C/SiC) ceramic matrix composites (CMCs) are one of the most promising candidate materials for many high-temperature applications, particularly as thermo-structural hardware for aerospace and aircraft applications. However, the major challenge lies in joining these composites to the airframe for their application as re-usable thermal protection systems for re-entry vehicles. This necessitates development of suitable fastening mechanisms which can withstand the aero-thermal loads of structures during re-entry conditions. Conventionally used high-temperature fasteners are molybdenum based and they suffer from problems related to oxidation at temperatures above 800 °C in air. Thus for such applications, C/SiC fasteners are considered more reliable due to the oxidation resistance offered up to 1650 °C. This study highlights the importance of fibre orientation in continuous C/SiC composite used for fabricating C/SiC fasteners for futuristic re-entry launch vehicles. The study describes fabrication of four different types of continuous fibre-oriented C/SiC composites viz., 2D stitched, 3D woven, 4D NOOBED and 5D NOOBED configurations via chemical vapour infiltration (CVI) route, and compares their tensile property at room temperature so as to find out a suitable preform for fabrication of C/ SiC fasteners. It was found that 2D stitched preform-based C/SiC specimen gave the highest tensile strength (157 ± 14 MPa), followed by 3D woven preform-based specimen (130 ± 25 MPa), while the tensile strength of 4D-and 5D-based specimens was very low. Through this study, two carbon fibre preforms viz., 2D stitched and 3D woven are selected for realizing C/ SiC fasteners. The role of pyrocarbon interphase coating on carbon fibres, in obtaining high mechanical properties is also understood.
The purpose of this study was to establish the conditions of CF surface preparation suitable for obtaining composites with favorable mechanical properties. The relationships between the interfacial properties of the carbon fiber/polymethylsiloxane composites and mechanical properties of ceramic composites (CF/SiOC, CF/SiC) formed during heat-treatment (HT) up to 1700℃ were investigated. The CF-resin interfacial strength has been modified by fiber surface treatment including nitric acid oxidation, silanization, as well as by forming a coating on the CF surface by depositing CNT or a pyrolytic carbon layer (PyC). The study of composite interphases (Interlaminar Shear Strength, ILSS and SEM) and surface tests of the modified CF (XPS, FT-IR, wettability measurements) showed different nature of the bonding between CFs and the resin matrix before and after HT. The CF silanization promoting chemical interfacial interactions significantly improved the ILSS between CFs and resin by 38.5%, wh...
Flexural Behavior of C/C Composites at High Temperature
2000
Unidirectional carbon fiber reinforced carbon composites (UD-C/C composites) were prepared from a high strength type PAN-based carbon fiber and a phenol resin. The mechanical behaviors of C/C composites were measured by four points bending and short beam three points bending tests up to 2600°C. The modulus and proof stress were constant until 1500°C and they were not affected by loading speed, but they measured over 2000°C were decreased at slower loading speed. Decreasing modulus and proof stress, plastic deformation was increased. Bending strength and shear strength were increased with the test temperature. Those strengths were influenced by very little presence the disoriented filaments, which was brought about by fabrication process of the composite.
A Brief Review on Carbon-Carbon Composites Their Properties and Their Future Aspects
International Journal of Research, 2015
Carbon-Carbon Composites plays a vital role in or day to day life. Its explicit strength and outstanding mechanical properties makes it even more important to human society welfare. Research has been going on a large scale to know more about the compound and enhance its properties as required by us. This paper throws light on the existing Carbon-Carbon Composites and its mechanical properties. It also enlightens the future aspects of Carbon-Carbon Composites.
Current research in oxidation-resistant carbon-carbon composites at NASA. Langley Research Center
1992
The significant potential of carbon-carbon composites for high-temperature structural applications is well established. For hypersonic vehicle applications, desirable properties include low density, high specific strength and stiffness, low coefficients of thermal expansion, and retention of mechanical properties above 3000 F. A significant problem associated with carbon materials, however, is that they oxidize rapidly in air at temperatures above about 800 F, and therefore must be protected from oxidation. Successful development of effective methods of oxidation protection is key to the eventual utilization of carbon-carbon composites on hypersonic vehicles such as NASP. In this presentation, the basic elements of an oxidation-protection system are described. Results from oxidation-performance evaluations of state-of-the-art ACC-4 type material in simulated airframe vehicle environments (temperature, pressure, and time) conducted at NASA Langley are also presented. NASA Langley has...
Carbon fiber Composites forecasts indicate several years of supply that will exceed the anticipated demand. Carbon fiber producers have used world leading technology to produce the most uniform and highest quality fiber. Carbon-fiber composites weight about one-fifth as much as steel, but can be similar or better in terms of stiffness and strength, depending on fiber grade and orientation. These composites do not rust or corrode like steel or aluminum. The aim of this paper is to present the current scenario of carbon fiber composites in industries and go towards the approach of carbon fiber composites in future direction with its advantages, disadvantages and applications in industrial machinery. Various type of composites based on reinforcement shape also presented in this paper. This paper also shows the Properties, Characteristics, Challenges, Opportunities and Future Trends of Composites towards industrial environment.