WU Chongjun 1,2, HE Yunpeng 2, WANG Yang 1, XIANG Jun 1, DUAN Mingxin 2, DING Zhijing 2, KONG Liping 2
(1. Zhuhai Luckyman Technology Co., Ltd., Zhuhai 519000, Guangdong, China; 2. Zhengzhou Sinoceram Technology Co., Ltd., Zhengzhou Functional Ceramics Engineering Technology Research Center, Dengfeng 452470, Henan, China)
Abstract: According to the Will-Fran model and the principle of cubic arrangement, the formula of ZrO2 volume fraction in ZTA ceramics inversely proportional to the cube of Al2O3/ZrO2 particle size ratio was derived. The content and particle size of Al2O3 and ZrO2 powders in the ZTA ceramic formula were calculated with the formula. Then, ceramic substrate samples were prepared by using tap-casting process, which were sintered in the ambient environment. The effects of the material composition and microstructure on mechanical and electrical properties of the ZTA ceramic substrates were studied. The ZrO2 content calculated according to the principle of cubic arrangement is 8.57%, of which 2.86% and 5.71% were from the ZrO2/Al2O3 particle size ratios of 0.414 and 0.225, respectively. The ZTA ceramic substrate had a flexural strength of 816 MPa and a volume resistivity of 6.9×1010 Ω·cm at 600 ℃. Therefore, these performances meet the mechanical and electrical requirements of ZTA ceramic copper-clad substrates and heating elements.
Key words: ceramic substrate; ZTA; material design; water cube; electrical properties