Hot-pressed laminated composites consisting of ZrB2–SiC ceramic and Cf/ZrB2–SiC composites

摘要

In this study, laminated composites consisting of ZrB₂–SiC (ZS) ceramic and carbon fiber (Cf) reinforced-ZrB₂–SiC matrix composites (Cf/ZrB₂–SiC, hereafter denoted by CfZS) were fabricated by hot-pressing. The effects of the layer thickness ratio of ZS to CfZS (ZS/CfZS) and the fiber concentration on the flexural strength were investigated. The flexural strength of the laminated composites was improved compared to that of the single-composites and the improvement was enhanced with increase of the ZS/CfZS ratio. However, the flexural strength decreased with increasing the fiber concentration of CfZS. In addition, the crack propagation behavior of the laminated composites was examined under indent cracking. The results showed that the crack propagation behavior related to the fiber concentration of CfZS, irrespective of the layer thickness. The cracks induced by the indenter rapidly propagated through the CfZS layer when the fiber volume fraction was 10%. However, the cracks were arrested ahead the CfZS layers for the fiber volume fraction equal to or greater than 30%.