硅树脂转化制备硅氧碳多孔陶瓷

Preparation of Silicon Oxycarbide Porous Ceramics by Silicone Resin

采用硅树脂RSN-6018为陶瓷先驱体,并引入一定比例的预固化硅树脂,在N_2气氛下于1200℃裂解转化制备组分单一、孔结构可控以及陶瓷产率高的硅氧碳(Si-O-C)多孔陶瓷,研究了预固化硅树脂含量对Si-O-C多孔陶瓷微观形貌和性能的影响。结果表明:预固化硅树脂的加入可有效调节Si-O-C多孔陶瓷的孔形貌、孔径以及气孔率,当预固化硅树脂含量低于90wt%时,随着预固化硅树脂含量的增加,孔结构从贯通圆孔变为颗粒"搭接"贯通孔,再变为颗粒堆积孔,且气孔率增大;而体积收缩减小,陶瓷产率提高;耐压强度在27.9~17.5 MPa之间。

Silicon oxycarbide（ Si-O-C） porous ceramics with single component,controllable pore structure and high ceramic yield were prepared at 1200 ℃ in N_2 atmosphere by using RSN-6018 silicone resin as preceramic polymer and introducing certain content pre-cured silicone resin. The effects of the contents of pre-cured silicone resin on the microstructure and properties of Si-O-C porous ceramics were studied.Results show that pre-cured silicone resin can adjust the pore morphology,pore diameter and porosity of Si-O-C porous ceramics. When the content of pre-cured silicone resin is lower than 90wt%,the pore structure of Si-O-C porous ceramics changes from the through-hole to the through-pore formed by the overlapping of particles and then to the open pore formed by the accumulation of particles with the increasing of the content of pre-cured silicone resin. At the meanwhile,the porosity increases. However,the shrinkage decreases,whereas ceramic yield increases. The compressive strength of Si-O-C porous ceramics is 27. 9-17. 5 MPa.