Preparation and properties of polycarbosilane modified silicon carbide ceramic membrane
Polycarbosilane was used to prepare modifed silicon carbide powder by coating method,this polycarbosilane-coated powder was used to prepare a green body of the membrane layer and sintered into a silicon carbide ceramic membrane with good morphology.The morphology and rejection performance of the membrane were analyzed by means of scanning electron microscope,laser confocal microscope,mercu-ry intrusion porosimeter and rejection performance test.The results showed that polycarbosilane played the role of sintering binder in the sintering process.When the coating amount was 5%,the surface of the layer was smooth without cracks,and the layer shape was good.When the silicon carbide particle size was 0.3 μm,the polycarbosilane coating amount was 5%and the sintering temperature was 1 750℃,the pore size of the prepared membrane layer was 0.842 μm,and the rejection rate of 100 nm nanospheres was as high as 89%.This study has shown that polycarbosilane has obvious advantages in the application of sili-con carbide membrane morphology and pore size control.
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