变密度预制体对C/C复合材料力学性能的影响

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Effect variable density preform on the properties C / C composites

Abstract：C/Ccomposites werefabricatedbyadjusting thedensity preforms along the thicknessdirectionandutilizing carbonfibers withdiferentthermalexpansioncoefficients.Underidenticalneedlinganddeposition processs，themicro structural morphologysamplecross-sections wasanalyzedusingfieldemisionscaning electron microscopy，whilepyrolyticcarbon structures were examinedthrough metallographicmicroscopy（broussonetiapapyifera）.Thisstudyfurthernvestigatesthe influence density-modifiedpreformsonthedeposition eficiencyand performance C/Ccomposites.Theresults show that the P1 samples were prepared with 0.4g/cm3 the thickness direction and 0.35g/cm3 both sides，and the P1 sample density was increased by 0.94g/cm3 . The B2 samples were prepared from 12 K fibers on both sides and 24 k fibersin the thickness direction，the B2 sample density was increased by 1.17g/cm3 .Moreover，the comprehensive performance B2 sample is the best，the compaction rate is about 0.04g⋅cm-3⋅h-1 ，and the overall density uniformity is high.The pyrolysis carbon structure is amixed structuresmooth layerand roughlayer，andthebendingstrengthis about73.5 MPa. Kevworde. dencitv·thermal evnansion cnefficient·C/Ccomnnsites·dennsitinn rate' nvrnlveis carhon structre

1引言

光伏行业是国家发展新能源的重要组成部分，应用于光伏行业的单晶硅的生长需在 1420°C 的高温条件下进行，因此单晶硅炉用热场材料需要具备优异的耐温性和力学性能，同时要求其杂质含量低，以确保拉晶过程的纯度要求[1-3]。（剩余7760字）