Producing of Composite Materials with Aluminium Alloy Matrix Containing Solid Lubricants

Abstract

The paper presents the basics information about manufacturing and selected properties of composite with aluminium alloy matrix containing glassy carbon as a solid lubricant. The so far used method based on mixing the prepared glassy carbon particles with a liquid metal matrix, has been compared with a new method elaborated by the authors of the article. With this novel method carbon is introduced into a composite with the application of liquid carbon precursor and porous ceramic foams. It is then followed by precursor pyrolysis where, as the result, glassy carbon is obtained. Ceramic foams help liquid precursor penetrate the ceramic spheroid pores by forming a thin film of glassy carbon on their walls. The composite produced in such a way features uniform distribution of carbon within its entire volume which significantly improves tribological properties of the composite. Costly mixing procedure is not needed. Sliding friction coefficient of the new composite against cast iron (µ = 0.06-0.28 at wearing in and 0,12 after wearing in) is much lower than in case of composite containing only ceramic foam as a reinforcing phase (μ = 0.25-0.32).

Tribological Characteristics of the Magnesium Matrix-Glassy Carbon Particles Composite Manufactured by Different Casting Methods

“…This was a result of the presence of a lubricant which was forming between the Mg3Al-GCp composite and the cast iron counter, independently of the material technology. In addition to the oxide and metal molecules, the wear product contains very fine glassy carbon, generated owing to the low shear resistance of GCp, which improves the conditions of the sliding friction [3,5].…”

“…The application of glassy carbon particles [1,2] as a component of a metal matrix composite can be a way of modifying the tribological properties of metal-based materials [3][4][5] and it is proposed for composites with matrixes made of aluminium and magnesium alloys. However, the properties of the new materials designed and obtained under precisely controlled conditions in the laboratory scale must be verified in the case when they are manufactured in the industrial scale.…”

Influence of Electrolytical Oxidising of Silumine Surfaces on the Quality of Bonding with Epoxy Resin

“…Conventional coated materials no longer meet these requirements. Therefore, composite materials have been developed [1][2][3][4][5] based on matrix alloy, ceramics and metal powders [6] which contain a reinforcing phase of various forms, such as fibers, particles, spheres, metal or ceramic foams [1][2][3] and nanowires or nanotubes [1,6]. Metallic foams can be developed by metallurgical methods with the use of suitable blowing agents or gas blowing process generating bubbles [7][8].…”

“…Metallic foams can be developed by metallurgical methods with the use of suitable blowing agents or gas blowing process generating bubbles [7][8]. An introduction of 10% of ceramic foam into AlCu5 alloy increases about four times the compression strength of this alloy [2]. They are not suitable as reinforcing material of composites with plastics matrix because they are too brittle.…”

Failure Progress of 3D Reinforced GFRP Laminate during Static Bending, Evaluated by Means of Acoustic Emission and Vibrations Analysis

“…In order to predict and model the above, it is necessary to understand the structure of the material in laminates; methods similar to those used for the classic materials are used [ 45 ]. Good knowledge of the failure mechanics makes it possible to find solutions that prevent damage and catastrophic failure, e.g., self-healing nanocomposites [ 46 ], composites with a modified structure [ 47 , 48 ] or precise tailored structures [ 49 , 50 ].…”