%0 Journal Article
%T Dielectric Properties of Porous Reaction-boned Si3N4 Ceramics with Controlled Porosity and Pore Size<br>
%A Jie XU
%A Dongmei ZHU
%A Fa LUO
%A Wancheng ZHOU
%A Peng LI
%A <br>
%J 材料科学技术学报
%D 2008
%I 
%X This paper presents the microwave dielectric properties of reaction bonded porous silicon nitride ceramics with variant porosity and pore size, which were prepared by adding pore-forming agent grains into the silicon powders. The experimental results show that the dielectric constant and the dielectric loss of the samples reduce evidently with increasing porosity in the sample. When the porosity is constant, the dielectric constant and the dielectric loss of the ceramics decrease visibly as the pore size increases. Among all the obtained samples, the minimum dielectric constant is about 2.4.
%K Porous silicon nitride ceramics
%K Reaction bonded
%K Dielectric properties
%K Radome<br>
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=84529CA2B2E519AC&jid=324DC3CAB22330DB19158AE0A9B7BFA5&aid=88810952185028F3C7B7F22B330AA7FE&yid=67289AFF6305E306&vid=B91E8C6D6FE990DB&iid=0B39A22176CE99FB&sid=334E2BB8B9A55ABB&eid=AA27B676BFCAA4BE&journal_id=1005-0302&journal_name=材料科学技术学报&referenced_num=0&reference_num=22