聚氨酯海绵的预处理对网眼多孔陶瓷性能的影响

INFLUENCE OF POLYMERIC SPONGE PRE-TREATMENT ON PROPERTIES OF RETICULATED POROUS CERAMICS

用聚氨酯海绵法制备网眼多孔陶瓷。研究了聚氨酯海绵的差热热重曲线及表面处理对网眼多孔陶瓷挂浆性能的影响。结果表明:聚氨酯海绵在700℃左右完全氧化分解。经过酸碱处理,再用羧甲基纤维素溶液、无机溶胶和聚碳硅烷溶液进行表面改性后,聚氨酯海绵的孔筋表面粗糙度增大,同时改善了它与浆料的润湿性能,使浆料在聚氨酯海绵上的挂浆量增加。随着浆料在聚氨酯海绵上挂浆量的增加,网眼多孔陶瓷的体密度增大,制得的网眼多孔陶瓷的抗压强度增加。经无机溶胶表面改性处理的聚氨酯海绵制得的网眼多孔陶瓷的抗压强度为0.79 MPa,比用未经处理的海绵制得的多孔陶瓷(0.45 MPa)提高大约75%。

Reticulated porous ceramics（RPC）were prepared by the polymeric sponge method. Thermogravimetric-differential scanning calorimetry curves of the polymeric sponge and the effect of surface treatment for the polymeric sponge on coating properties of RPC were studied. The results show that the polymeric sponge is completely decomposed at about 700℃. After being treated by acid and alkali, and modified by carboxymethyl-cellulose, organic sol and polycarbosilane（PCS）, the roughness of the polymeric sponge surface roughness increases and the wetting ability between the polymeric sponge and the slurry increases, Both the increased surface and increased wetting ability lead to an increase of the loading of the slurry on the polymeric sponge. With increasing loading, the bulk density of RPC increases, which leads to improved compressive strength of RPC. The compressive strength of RPC prepared by the polymeric sponge method and modified by organic sol is 0.79 MPa, which is 75% higher than that of RPC （0.45 MPa） prepared by the polymeric sponge method without any treatment.