Why is the brittleness of ceramics so great?
It is difficult to break the bond because of the high covalent bond strength and great energy. Therefore, it is difficult for the ceramics to form a stable lattice structure and the dislocation sliding
The fracture process of an object is elastic deformation, plastic deformation, and finally fractureIt is difficult for the dislocation to slide when the ceramics are subjected to greater impact force, and the elastic deformation and plastic deformation are difficult to occur, so they are broken at once
In polymer materials, but also by covalent bond, but it is the chain structure, but the binding force between the chain and chain is not a covalent bond, the bond is small, the impact force when the chain is broken, can produce relative slip, can elastic deformation, plastic deformation, and fracture therefore, polymer materials not brittle, and exhibits brittle ceramic.
