炭化压力对编织C/C复合材料致密过程及结构的影响

目的研究不同炭化压力环境对C/C复合材料致密过程及结构的影响。方法通过浸渍/高压炭化工艺在不同炭化压力下制备高温煤沥青炭块及沥青基C/C复合材料,并研究不同炭化压力环境下对其密度和孔隙的影响。结果制备沥青炭的炭化压力由20 MPa增大至60 MPa时,沥青炭体积密度由1.08 g/cm~3增加至1.39g/cm~3,质量比表面积由14.74增加至16.51,开孔率由26.73减少至7.94,孔隙填充效果明显改善,浸渍-炭化的增密效率得到提升。结论在编织C/C材料的致密过程中,压力越大,其孔隙越小,分布越均匀,故产品致密效果越好。

Influences of Carbonization Pressures on Densification Process and Structure Characteristic of Woven C/C Composites

Objective To study the influences of different carbonization pressures on densification process and structure characteristic of C/C composites. Methods High temperature pitch derived carbon bulk and pitch matrix C/C composite were prepared by PIC process at different pressures. Influences of different carbonization pressures on bulk density and porosity were determined. Results When the carbonization pressure for preparing pitch carbon was increased from 20 MPa to 60 MPa, the bulk density of the pitch carbon was increased from 1.08 g/cm3 to 1.39 g/cm3; the mass specific surface area was increased from 14.74 to 16.51; the opening ratio was decreased from 26.73 to 7.94. The results showed that the effect of pore filling and the densification efficiency of impregnation-carbonization were improved. Conclusion During the densification process of woven C/C materials, the greater the pressure, the smaller the pore, and the more uniform the distribution, so the effect of densification is better.