(中南大學粉末冶金國家重點實驗室， 長沙 410083)
摘 要: 以炭纖維針刺氈為預制體， 采用化學氣相浸滲(CVI)法或結合液相法制備了熱解炭、 樹脂炭和瀝青炭基質的準三維C/C復合材料， 研究了這些材料的層間剪切性能及其斷裂機理。 結果表明： CVI基質炭比瀝青基質炭更有利于C/C復合材料的層間剪切性能的提高； 剪切強度隨密度增高而增大， 致密度越高， 基體支撐越強， 同時微裂紋和孔隙度就越低， 斷裂裂紋不易形成或擴展， 強度性能就越好； 純?yōu)r青基質炭試樣為“突發(fā)”的脆性斷裂方式， 其他基質炭試樣表現為韌性斷裂方式。
關鍵字: C/C復合材料; 熱解炭; 層間剪切性能; 斷裂機理
（ State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:The semi-3D C/C composites were fabricated by needled felt through chemical vapor infiltration (CVI) and impregnation with liquid pitch and resin. Their interlaminar shear strengths and fracture mechanism were studied. The experimental results show that the interlaminar shear strengths of C/C composites with pyrolytic carbon is higher than that of C/C composites with pitch carbon; the interlaminar shear strengths of C/C composites increase with the densities increasing, the higher the density is, the stronger support the matrix can provide, and the less crack and pore they have, so the fracture-crack is difficult to extend and thus ensure the high strength; C/C composites with pure pitch carbon show sudden brittle fracture mechanism, and the others show tough mechanism.
Key words: C/C composites; pyrolytic carbon; interlaminar shear strengths; fracture mechanism
