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A B 4 C‐SiC composite without annealing and two B 4 C‐SiC composites followed by annealing at 1000℃ and 1200℃ for 1 hour in air, respectively, were prepared. The tribological properties of the three composites were evaluated by sliding against SiC balls at room temperature under unlubricated conditions. The B 4 C‐SiC composite can obtain lower friction coefficient by annealing at 1000℃, whereas the friction coefficient of B 4 C‐SiC composite annealed at 1200℃ was significantly increased. The cause for this difference was ascribed to different surface compositions after annealing. The mechanism of self‐lubrication of the B 4 C‐SiC composite was the formation of H 3 BO 3 layer.
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Zhang et al. (2020) studied this question.
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