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Preparation method of high-toughness ceramic material for self-lubricating cutter
The invention relates to a preparation method of a high-toughness ceramic material for a self-lubricating cutter, and belongs to the technical field of ceramic materials. The high-toughness ceramic material for the self-lubricating cutter is prepared by adding the zirconium oxide whiskers, zirconium oxide is tetragonal phase zirconium oxide at normal temperature, and when the temperature rises, tetragonal phase zirconium oxide is converted into a monoclinic phase to induce the surface to generate compressive stress, so that continuous expansion of cracks is prevented or delayed, zirconium oxide whiskers are added into the ceramic material so that the strength of the ceramic material can be effectively improved, and when the whiskers are subjected to external acting force, the whiskers bridged in the ceramic material can generate acting force to force the cracks to be closed, so that the effect of consuming some external force to do work is achieved, and the toughness and the strength of the ceramic material are further improved, when the cracks diffuse to the whiskers, the diffusion direction of the cracks is changed, and the cracks are diffused along the whiskers due to dissociation of the whiskers and the ceramic material, so that the area of the formed new surface is increased, the cracks can be within the critical size, and the toughness of the ceramic material is further enhanced.
本发明涉及一种自润滑刀具用高韧性陶瓷材料的制备方法，属于陶瓷材料技术领域。本发明通过添加氧化锆晶须，制备一种自润滑刀具用高韧性陶瓷材料，氧化锆常温下为四方相氧化锆，当温度升高时，四方相氧化锆转变为单斜相，诱导表面产生压缩应力，从而阻止或延缓裂纹的继续扩展，陶瓷材料中添加氧化锆晶须，可以有效提高陶瓷材料的强度，当晶须受到外加作用力时，在陶瓷材料内部桥连的晶须会产生一个作用力迫使裂纹闭合，从而达到耗费一些外力所做功的效果，进而增加陶瓷材料的韧性和强度，当裂纹由陶瓷材料表面扩散到晶须时，裂纹的扩散方向就会发生改变，因为晶须和陶瓷材料的解离而导致了裂纹沿着晶须进行扩散，这不仅增大了所形成的新表面的面积，而且还可以使裂纹在其临界尺寸之内，进而加强陶瓷材料的韧性。
Preparation method of high-toughness ceramic material for self-lubricating cutter
The invention relates to a preparation method of a high-toughness ceramic material for a self-lubricating cutter, and belongs to the technical field of ceramic materials. The high-toughness ceramic material for the self-lubricating cutter is prepared by adding the zirconium oxide whiskers, zirconium oxide is tetragonal phase zirconium oxide at normal temperature, and when the temperature rises, tetragonal phase zirconium oxide is converted into a monoclinic phase to induce the surface to generate compressive stress, so that continuous expansion of cracks is prevented or delayed, zirconium oxide whiskers are added into the ceramic material so that the strength of the ceramic material can be effectively improved, and when the whiskers are subjected to external acting force, the whiskers bridged in the ceramic material can generate acting force to force the cracks to be closed, so that the effect of consuming some external force to do work is achieved, and the toughness and the strength of the ceramic material are further improved, when the cracks diffuse to the whiskers, the diffusion direction of the cracks is changed, and the cracks are diffused along the whiskers due to dissociation of the whiskers and the ceramic material, so that the area of the formed new surface is increased, the cracks can be within the critical size, and the toughness of the ceramic material is further enhanced.
本发明涉及一种自润滑刀具用高韧性陶瓷材料的制备方法，属于陶瓷材料技术领域。本发明通过添加氧化锆晶须，制备一种自润滑刀具用高韧性陶瓷材料，氧化锆常温下为四方相氧化锆，当温度升高时，四方相氧化锆转变为单斜相，诱导表面产生压缩应力，从而阻止或延缓裂纹的继续扩展，陶瓷材料中添加氧化锆晶须，可以有效提高陶瓷材料的强度，当晶须受到外加作用力时，在陶瓷材料内部桥连的晶须会产生一个作用力迫使裂纹闭合，从而达到耗费一些外力所做功的效果，进而增加陶瓷材料的韧性和强度，当裂纹由陶瓷材料表面扩散到晶须时，裂纹的扩散方向就会发生改变，因为晶须和陶瓷材料的解离而导致了裂纹沿着晶须进行扩散，这不仅增大了所形成的新表面的面积，而且还可以使裂纹在其临界尺寸之内，进而加强陶瓷材料的韧性。
Preparation method of high-toughness ceramic material for self-lubricating cutter
一种自润滑刀具用高韧性陶瓷材料的制备方法
ZHAN AIPING (author)
2021-01-05
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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