ZTA陶瓷基板力学和光学性能的研究

以α-Al2O3粉体为主相材料,添加不同含量的ZrO2(体积分数0%~28%),采用流延成型工艺和常压烧结方法制备ZTA陶瓷样品,研究ZrO2的含量、气孔率、基板厚度以及白度对ZTA陶瓷基板力学和光学性能的影响。结果表明:随ZrO2含量增加,断裂韧性和抗弯强度呈现先增大后减小的趋势,ZrO2含量为体积分数20%时达到最大值,分别为5.7 MPa·m1/2和865 MPa;当ZrO2含量低于体积分数12%时,随气孔率增加,反射率升高;此外,ZTA陶瓷基板的厚度增加,反射率升高;白度下降,反射率也随之降低。最终制备出一种反射率达到100.7%,满足LED高光效需求的ZTA陶瓷基板。

Mechanical and optical properties of ZTA ceramic substrate

Usingα-Al2O3 powder as the main phase material,ZrO2 with different volume fractions were added(i.e.,0%,4%,8%,12%,16%,20%,28%).The samples were prepared by the casting process and atmospheric sintering.The effects of ZrO2 content,porosity,substrate thickness and whiteness on the mechanical and optical properties of ZTA ceramic substrates were investigated.The results show that as the amount of ZrO2 increases,the fracture toughness and flexural strength increase first and then decrease.The maximum value can be reached when the ZrO2 content is 20%,which are 5.7 MPa·m1/2 and 865 MPa,respectively.When the content of ZrO2 is less than 12%,the reflectance increases with increasing porosity.Moreover,the reflectivity of the ZTA ceramic substrate increases with increasing thickness and decreases with the whiteness of the substrate.Finally,a ZTA ceramic substrate with a reflectivity of 100.7%was prepared,which meets the high luminous efficiency requirements of LEDs.