Sol-gel Method Preparation And Performance Testing Of High Temperature Resistance And Porous Low Dielectric Constant Material

There is an increasing interest to develop low dielectric constant and low loss materials that can operate in the GHz range for wireless telecommunication systems. One of these new materials are BN/SiCO composite ceramics which arouses people's widespread interest.Therefore, In this paper, the preparation and property of BN / SiCO, a kind of organic - inorganic compound porous material,is studied in detail.The porous low BN/SiCO were prepared by using sel-gel and pyrolysis. BN/SiCO composite ceramics having a dielectric constant,ε, as low as 2.1 have been made by pyrolysis of filled gels at temperature 1000°C . Such a low value ofεis supposed to be due to a combination of factors: the lowεof BN and of SiCO itself and the high amount of residual porosity present in the samples. The porous microstructure– and the related dielectric properties– obtained at 1000°C show a very good stability. This result has been ascribed to the high viscosity of the SiCO glass and to the platelet shape particles of BN. Both factors hinder the sintering and prevent the closure of the pores. We systematically and comparatively studied the properties of the BN/SiCO, such as preparation, microstructure, chemical bond state, and electrical and mechanical properties. in this paper, the technics of sel-gel is emphasizely illuminated in detail, besides, the experiment flow and the impact of various conditions on experiment result is introduced. The results of SEM indicate that the pore size is 4nm, and the sample have the uniform hole distributing.The electrical and porosity of the BN/SiCO are analyzed by HP test instrumentation and BET test instrumentation, we analyzed the sample chemical bond by the way of FTIR-ATR. The results of the test shows that porous BN/SiCO has good properties, the sample is good at the low dielectric.