Influence of the Composition and Structure of B4C - Al2O3 Ceramic on the Tribotechnical Characteristics in Friction Against Steel
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Abstract
The morphology and phase composition of friction surfaces and the tribotechnical properties of the (B4C - Al2O3)-steel 45 system are studied under dry friction at various sliding velocities and contact loads. We have found that fine-grained secondary structures are formed on the friction surfaces. The morphology and phase composition of these structures depend on the ceramic composition and on the test conditions. A comprehensive investigation of friction surfaces, using x-ray, electron-diffraction electron-probe, and electron-microscopy analysis, has shown that the structure and morphology of the secondary phases determine the tribotechnical properties of ceramic-steel couples. The maximum wear resistance of B4C ceramics containing 5-20 mass% Al2O3 is determined by the formation of dense secondary-phase thin films on the friction surface.
Keywords
ceramics boron carbide friction wear structure morphology film secondary structurePreview
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