Fabrication and thermal expansion behavior of SiO2-TiO2 ceramic filled PTFE composites
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摘要: 为了使微波基板材料与Cu金属衬底的热膨胀性能匹配，对陶瓷/聚四氟乙烯（PTFE）微波复合基板材料的热膨胀性能进行了研究。采用湿法工艺制备了以SiO2和TiO2为填料的SiO2-TiO2/PTFE复合材料，研究了复合材料密度、填料粒度和填料体积分数对SiO2-TiO2/PTFE复合材料热膨胀性能的影响。结果表明，当SiO2的体积分数由0增至40%（TiO2 ：34%~26%）时，SiO2-TiO2/PTFE复合材料的线膨胀系数（CTE）由50.13×10-6 K-1减小至10.03×10-6K-1。陶瓷粉体粒径和复合材料密度减小会导致CTE减小。通过ROM、Turner和Kerner模型计算CTE发现，ROM和Kerner模型与实验数据较相符，而实验值与Turner模型预测值之间的差异随PTFE含量的升高而逐渐增大。Abstract: To match the thermal expansion coefficient of copper foil, the thermal expansion properties of SiO2-TiO2 ceramic filled PTFE microwave substrate composites were investigated. SiO2 together with TiO2 were added to PTFE matrix by the wet process. The influences of the SiO2-TiO2/PTFE composite density, ceramic particle size and volume fraction of ceramic filler on the thermal expansion coefficient(CTE)of the SiO2-TiO2/PTFE composites were investigated. The results show that as the volume fraction of SiO2 increases from 0 to 40%(TiO2: 34%-26%), the linear expansion coefficient of the composites decreases from 50.13×10-6K-1 to 10.03×10-6 K-1. The decrease of ceramic particle size and density of composites results in the decrease of the CTE. According to the calculation of CTE with ROM, Turner and Kerner models, the experimental values show better matching with the theoretically predicted values using ROM and Kerner models. Whereas, promotion of the difference between experimental value and the predicted value by Turner model is along with PTFE volume fraction increasing.
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Keywords:
- composites /
- polyfluortetraethylene /
- TiO2 /
- SiO2 /
- linear expansion coefficient
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