A functionally gradient coating on carbon fibre for C/Al composites

Yu, Jiao; Li, H. L.; Shang, Beirong

doi:10.1007/bf00356812

Cited by 22 publications

(7 citation statements)

References 15 publications

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“…[3][4][5][6][7][8][9][10][11] The reaction at the carbon-aluminum interface at temperatures above 500°C to form aluminum carbide (Al 4 C 3 ) has long been considered to affect critically the strength of C/Al composites. Improper wetting and chemical reactions at the interface during synthesis or under service conditions can degrade the mechanical properties of the composites.…”

Section: Introductionmentioning

confidence: 99%

Effects of carbon fiber/Al interface on mechanical properties of carbon-fiber-reinforced aluminum-matrix composites

Chao

2004

Metall Mater Trans A

111

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Carbon-fiber (CF)-reinforced aluminum-matrix composites were prepared by spreading fibers and squeeze casting. The interface structure of CF/Al composites was examined using high-resolution transmission electron microscopy (HRTEM) and electron spectroscopy for chemical analysis (ESCA). Aluminum carbide (Al 4 C 3 ) interfacial reaction products were observed to nucleate heterogeneously from carbon fibers and to grow toward the aluminum matrix in the form of lath-like crystals after heat treatment. The growth of aluminum carbide was anisotropic, since it was faster along the a-and b-axes of the basal plane than along the c-axis. Both the tensile strength and the elongation of composites decline with an increased duration of heat treatment. The results of ESCA revealed that approximately 1 pct of carbide enhanced interface bonding. However, increasing the content of brittle carbides to over 3 pct after heat treatment degraded the mechanical properties of composites.

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Section: Introductionmentioning

confidence: 99%

Effects of carbon fiber/Al interface on mechanical properties of carbon-fiber-reinforced aluminum-matrix composites

Chao

2004

Metall Mater Trans A

111

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“…The crucible is heated by induction heating (5). To ensure impregnation in the matrix melt, cavitation is created using niobium waveguide (6). Having passed through the outlet die (7) in the crucible wall, the fiber impregnated with the melt enters the cold region.…”

Section: Strength Testsmentioning

confidence: 99%

“…The authors of this work note that a pyrolytic carbon coating not only performs a barrier function, preventing the formation of aluminum carbide, but also plays the role of weak boundaries that ensure non-brittle fracture. Another example of increasing the strength of a CF/Al composite is shown in [6], where C/SiC/Si CVD laminated fiber was used. The tensile strength achieved by the authors was 1250 MPa.…”

Section: Introductionmentioning

confidence: 99%

On the Strength of the CF/Al-Wire Depending on the Fabrication Process Parameters: Melt Temperature, Time, Ultrasonic Power, and Thickness of Carbon Fiber Coating

Galyshev

2021

Metals

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The process of the production of a CF/Al-wire by pulling carbon fibers through an aluminum melt has at least 15 parameters. The main parameters include the power of ultrasonic treatment, the time of contact of the fiber with the matrix melt, and the melt temperature. In addition, the presence of a barrier coating on the fiber surface and its thickness significantly affects the properties of the resulting material. The importance of these parameters is due to their direct effect on the chemical interaction between the aluminum matrix and the carbon fiber. This interaction leads to the formation of aluminum carbide, a hygroscopic, brittle phase that ultimately significantly reduces the strength of such composites. In this regard, limiting a chemical reaction at the matrix/fiber interface in the production of CF/Al composites is one of the main technological problems. The main goal of this work is to pragmatically elucidate the effect of the above parameters on the strength of CF/Al composites. It is shown that the strength of a CF/Al-wire can reach 2000 MPa.

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“…One of the main problems in the manufacture of metal matrix composites is the chemical reaction between the matrix and the fiber because this negatively affects the mechanical properties of the composite. The use of barrier coatings of carbon fiber allows for limiting chemical interaction, which leads to an increase in the mechanical properties of the materials mentioned [ 1 , 2 , 3 , 4 , 5 ]. From a practical viewpoint, sol-gel methods are the most promising since they do not require specialized equipment or any special conditions, such as a high temperature and/or a pressure level different from the atmospheric one.…”

Section: Introductionmentioning

confidence: 99%

Heat Treatment Effect on the Phase Composition of the Silica Electrochemical Coating and the Carbon Fiber Strength

et al. 2021

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This work is devoted to the study of the chemical and phase composition of a carbon fiber coating obtained by the electrochemical sol-gel method. The experimental data obtained using several independent complementary methods, including X-ray phase analysis, thermogravimetric and differential thermal analysis, scanning electron microscopy and elemental analysis, and X-ray photoelectron spectroscopy, are in good agreement with each other. It was found that the resulting coating consists of amorphous silicon oxide and crystalline potassium carbonate. Heating above 870 °C leads to the crystallization of cristobalite from amorphous silicon dioxide. At a temperature of about 870 °C, the coating acquires a smooth surface, and heating above 1170 °C leads to its destruction. Thus, the optimum temperature for the heat treatment of the coating is about 870 °C. The loss of strength of carbon fiber at each stage of coating was estimated. A full coating cycle, including thermal cleaning from the sizing, coating, and heat treatment, results in a loss of fiber strength by only 11% compared to the initial state.

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A functionally gradient coating on carbon fibre for C/Al composites

Cited by 22 publications

References 15 publications

Effects of carbon fiber/Al interface on mechanical properties of carbon-fiber-reinforced aluminum-matrix composites

Effects of carbon fiber/Al interface on mechanical properties of carbon-fiber-reinforced aluminum-matrix composites

On the Strength of the CF/Al-Wire Depending on the Fabrication Process Parameters: Melt Temperature, Time, Ultrasonic Power, and Thickness of Carbon Fiber Coating

Heat Treatment Effect on the Phase Composition of the Silica Electrochemical Coating and the Carbon Fiber Strength

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