Toughening principle of alumina ceramic junction

Toughening principle of alumina ceramic junction

Alumina ceramics is a kind of ceramics with a wide range of uses. Because of its superior properties, it has been widely used in modern society to meet the needs of special properties. With the use and technology of alumina ceramics becoming more and more mature, some indicators still need to be improved, which requires joint research.

At the same time, about some performance parameters of alumina ceramics, I also hope that everyone can clearly put forward, so that researchers and manufacturers can study and design according to the requirements of users, so as not to have no purpose. By adding or generating particles, whiskers, fibers and other reinforcing materials into the ceramics, the toughness of the ceramics is greatly improved, and the strength and modulus are also improved to a certain extent. Toughening methods mainly include particle toughening, whisker toughening, fiber toughening, etc. The toughening principle of alumina ceramic structural parts can be summarized as follows:

• ①Residual stress field is generated in the reinforcement and the surrounding matrix, which hinders the expansion of cracks and enhances the toughness;
• ②The pinning effect of micro-cracks and the effect of crack tip and tail;
• ③The reinforcement causes stress relaxation at the crack tip and slows down the crack propagation;
• ④ Debonding of whiskers and short fibers to slow down crack propagation;
• ⑤ Microstructure, inhibit grain growth, strengthen toughness.

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