若何战胜陶瓷资料的脆性(国外英文资料).docVIP

如何克服陶瓷材料的脆性(国外英文资料) How to overcome the brittleness of ceramic materials 061110425 zou xin Engine efficiency is generally used in esteem ratios to measure and improve in esteem than a solution is to reduce weight, can choose specific strength and rigidity than big material, at present only ceramic materials are the two aspects of potential, but ceramic materials and have a fatal weakness, brittleness is big, and means that ceramics cant bear mechanical impact performance, if you can overcome this weakness, coupled with its high temperature resistance, corrosion resistance, wear resistance, high strength and other valuable performance, so the future of the ceramic materials are limited, even far more than the modern high quality alloy. In recent years, the study of traditional ceramics and found that it is weak, there are two main reasons: first, because ceramic sintering temperature is low, usually is 800 ℃ ~ 1000 ℃, so the porosity is higher. In the section of the pottery fragment, it is not hard to see many small holes, and the particles made of pottery are bulky. Although porcelain firing temperature is higher than the pottery (usually 1200 ℃ ~ 1400 ℃), the structure is composed of a lot more than fine pottery, with the naked eye could see no minor defects. But if you through a microscope, in the section of porcelain pieces, you can see many small scars, crack, blowhole and inclusions, crystal defect and the surface scars, they are likely to be the birthplace of ceramic cracks. Second, due to the ceramic belongs to brittle material, once appear crack, it is not like metal plastic deformation ability, therefore, had to what to break the casserole (grain). As for under the condition of thermal shock, as a result of the thermal conductivity of the ceramic is poorer, thermal expansion coefficient, thermal stress increasing, therefore, the expansion of the crack speed will be further intensified. In daily life, if we use an earthenware pot stewed food, can only use s