Compared with metal materials, the machining performance of zirconia ceramics is obviously reduced a lot, because of its brittleness, but it is a high temperature resistant ceramics and has super wear resistance and corrosion resistance, high hardness and high strength, the following Pintejin Ceramics Factory How to solve the toughening method of ceramic matrix composites will be introduced.
Since ceramics are polycrystalline sintered materials composed of ionic bonds or covalent bond grains, there is almost no slip or dislocation movement at room temperature. Once the material is in a stressed state, it is difficult to cause slip or dislocation. Plastic deformation is used to relax stress, and the energy required for crack generation and expansion is small, so ceramic materials are mostly brittle. Therefore, when compositing, in addition to maintaining the good performance of ceramics, we should also strive to obtain excellent performance in other aspects. The most important point is to improve its room temperature toughness.
Processing ceramic parts One of the main purposes of composite ceramic materials is to overcome their brittleness. The improvement of the toughness of ceramic matrix composites runs through the entire development process of the material. It is well known that ceramic materials exhibit brittleness due to the lack of an independent slip system at room temperature. It does not produce dents or deformations under stress like metal materials, and it is also extremely resistant to cracks, pores and inclusions. Brittle materials that are sensitive to small defects.
In the process of improving and improving toughness, material workers add various ceramic particles, red fibers and whiskers or their composites to the ceramic matrix to prepare various ceramics and composite materials, which are successfully used in practical industries. in production. At present, although there are many reports on the toughening of ceramic matrix composites, it is generally believed that there are roughly three methods of toughening, namely, dispersion toughening, phase transformation toughening, and fiber (whisker) initializing. Another toughening method is a combination of the above methods.
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