Toughening of ceramic materials(Whisker ceramic inserts)

Ceramic materials have excellent characteristics such as high temperature, corrosion resistance and wear resistance, but they have the disadvantages of large brittleness and easy fracture, which limits their practical application range, so improving the brittleness of ceramic materials, increasing strength and improving their reliability in practical applications becomes the key to their wide application. The toughness of ceramic materials can be enhanced by mechanisms such as whiskers, fibrillation, particle dispersion and hardening. Crystal hardening ceramic-based composites are considered to be effective measures for high temperature applications, which have been commercialized and used in cutting tools, wear-resistant parts, aerospace and military devices, etc.

The whisker is a type of single crystal fiber material with an approximate regular cross-section, with a cross-sectional area of less than 4 to 10cm 2, a long diameter ratio of 5 to 1000, or even higher, and an internal and external structure almost complete. At present, the application of Si-C crystal whiskey ceramic-based composite materials.