The influence of barrier coating parameters on the strength of metal matrix composites

P.V. Soloviev ORCID logo , R.F. Gallyamova, A.I. Gomzin show affiliations and emails
Received 15 April 2019; Accepted 08 July 2019;
This paper is written in Russian
Citation: P.V. Soloviev, R.F. Gallyamova, A.I. Gomzin. The influence of barrier coating parameters on the strength of metal matrix composites. Lett. Mater., 2019, 9(3) 360-365


Investigation of the effect of a TiO2 barrier coating deposited on carbon fibers by the sol-gel method, and heat treatment on the strength properties of the Сf/Al composite.In connection with the prospect of using metal matrix composites for various types of structural applications (in particular, thermally loaded elements of aviation and rocket-space technologies), recently more and more research has been focused on exploring the possibility of bonding controlling at a fiber-matrix interface, which, as a rule, is a weak point for composite materials of this type. In the case of carbon-aluminum composites, in order to fully reveal their strength properties, it is necessary to solve the problem with the formation of brittle aluminum carbide at the interface, drastically reducing the mechanical characteristics of composite materials. There are several ways to solve this problem, but the most promising is the application of barrier coatings, in particular oxide coatings, on the surface of the fibers. In this work, we have investigated the effect of single-layer, two-layer and three-layer coatings of titanium dioxide TiO2 deposited on carbon fibers by the sol-gel method, and heat treatment at 150°С, 350°С and 550°С for 1 hour on the strength of carbon-aluminum composites at three-point bending. It has been found that when using the sol-gel technology, titanium dioxide covers the fibers surface completely. In the microstructure of composites reinforced with uncoated and coated fibers, there are no pores or areas without impregnation. On average, the bending strength for carbon-aluminum specimens reinforced with uncoated fibers increases significantly after annealing, and the titanium dioxide coating in turn also contributes to an increase in the strength properties of the carbon-aluminum composite.

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1. Russian Foundation for Basic Research - № 18‑33‑00351