Research On The Mechanical Properties Of Nano-composite PZT And Conventional PZT

In this paper, the mechanical properties tests such as flexural strength, modulus of elasticity, hardness and fracture toughness have been done. On the basis of these tests, the influence of the nano-composite technology on the mechanical properties of PZT has been studied, the indentation size effect of conventional PZT and nano-composite PZT has been researched, the range of load has been given which used to measure the fracture toughness of ceramic by IM method, and the bending strength result of conventional PZT has been analyzed by Weibull statistical distribution function.The results show that the nano-composite technology can improve the mechanical properties of PZT comprehensively, and the main mechanism of strengthen-toughen of nano-composite PZT is grain boundary strengthening and the transformation from intergranular to transgranular. The results of hardness test have obvious indentation size effect, and the true hardness values of the two materials are respectively 3397MPa and 2911MPa. The load,when crack parameter c/a bigger than 2.5, shoud be selected to measure the fracture toughness of ceramic, as the dispersion of hardness value and randomicity of indentation crack exist at the small indentation load stage. Weibull distribution function can describe the dispersion of bending strength value exactly.