Figure 3.16 shows the micromorpholo

Figure 3.16 shows the micromorphology of carbon fiber bridging and the central bridging of carbon fiber. When the high aspect ratio carbon fiber is uniformly distributed in the zirconia matrix, the main crack propagation direction is easy to cross the direction of carbon fiber. In general, a bridge zone composed of many fibers is formed at the crack tip, resulting in bridging effect. The carbon fiber in the bridge area is perpendicular or at an angle to the crack propagation direction. The mechanism of zirconia on both sides of the carbon fiber joint crack. When the crack needs to continue to expand, carbon fiber will play an obstacle role, so that more energy will be consumed in the process of crack growth. Because the thickness and fineness of the bridge fiber in this area are the same, it is the bridge in the middle of carbon fiber. When the middle part of the carbon fiber is used as the bridging medium, it is found that both sides of the bridge area on the carbon fiber are closely connected with the zirconia ceramic matrix. If the carbon fiber is pulled out or pulled out, more external load is needed to provide tensile stress, so the bridge joint in the middle of the fiber can greatly improve the fracture toughness of the material.