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陶瓷材料切削加工的主要困难之一是它的脆性。如果能够解决这个问题,将会产生有利的效果。使脆性材料进行延伸性的破坏,一般可以考虑采用两种方法。即:(1)在大静水压力下;(2)提高温度。前一种方法是加压切削加工。从理论上说,需要相当高的压力,用简单的实验不能确认其效果。后一种方法是“加热切削”。这里的“加热切削”与单纯用加热来降低金属屈服强度的加热切削不同,而是利用陶瓷材料塑性变形对温度的依赖性大于裂纹源形成对温度的依赖性这一性质,将脆性破坏改变为延伸性的破坏(见图1),图中B为脆性破坏应力,Y为塑性破坏应力。
One of the major difficulties in cutting ceramic materials is its brittleness. If we can solve this problem, it will have a beneficial effect. To brittle materials to extend the destruction, the general can consider using two methods. That is: (1) under large hydrostatic pressure; (2) to increase the temperature. The former method is pressurized cutting. In theory, it takes a lot of pressure and can not be confirmed with simple experiments. The latter method is “heated cutting.” Instead of heating simply by heating to reduce the yield strength of the metal, the plasticity of the ceramic material depends on the temperature dependence of the plastic deformation to be greater than the dependence of the crack source on the temperature, changing the brittle failure to Extendable damage (see Figure 1), the figure B is the brittle failure stress, Y is the plastic failure stress.