Fabrication and characterization of B4C-based ceramic composites with different mass fractions of hexagonal boron nitride
Source abstract
Abstract
Abstract In this paper, hexagonal boron nitride (hBN) was introduced into boron carbide (B 4 C) and B 4 C-based ceramic composites with different mass fractions of hBN were fabricated via hot pressing. The phase composition, microstructures, mechanical properties, and machinability of the B 4 C-based ceramic composites were investigated. The tribological properties of the B 4 C-based ceramic composites against AISI 321 austenitic stainless steel under dry sliding conditions were also studied. It was found that, with increasing the content of hBN, the bulk density, relative density, bending strength, fracture toughness and Vickers hardness of the B 4 C-based ceramic composites decreased, while the porosity increased. When the content of hBN came up to 20 wt%, the B 4 C-based ceramic composites could be machined easily by using cemented carbide drills. The addition of hBN into the B 4 C matrix improved the tribological properties of the B 4 C-based ceramic composites due to the formation of a tribofilm consisting of boron and metal oxides.
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Research context
OpenAlex topics: Boron and Carbon Nanomaterials Research · Advanced ceramic materials synthesis · Aluminum Alloys Composites Properties
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