(中南大學 粉末冶金國家重點實驗室， 長沙 410083)
摘 要: 以瀝青、 瀝青加焦炭粉和樹脂加焦炭粉3種預浸料制備纖維預浸體， 模壓成型制備初坯體，然后用瀝青液相法制備了3種單向C/C復合材料試樣， 對這些試樣的密度、 孔隙率和顯微結構進行了測試和觀察。 在熱壓成型初坯體內， 收縮微裂紋沿纖維軸向與外界相通，可被再浸漬填充， 而孔洞則大多與外界隔絕， 不能被再浸漬填充。 添加焦炭粉作填料有利于C/C復合材料中纖維體積含量的控制、 減少封閉氣孔的形成， 提高材料的密度。 但焦炭粉末將擾亂基體層狀結構組織， 甚至使其出現紊亂狀態(tài)。
關鍵字: C/C復合材料； 填充； 焦炭填充料； 顯微結構
composites fabricated by liquid method
（State Key Lab for Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:Three kinds of unidirectional fibre-reinforced C/C composites were fabricated by the liquid method using pitch, pitch plus coke and resin plus coke during the prepreg. Their densities, porosities and microstructures were tested and observed. In primary green composites, shrinkage cracks are formed mostly along the fibre axial and connected to the outside. They can be easily reimpregnated. However, pores are usually isolated from the outside and cannot be reimpregnated. The coke fillers can modify the microstructures. The use of filler particles facilitates the control of the fibre volume fraction and the reduction of the pores formed during moulding. The composites with coke fillers can be reimpregnated to get higher densities. On the other hand, coke particles interfere with the layer microstructure of the carbon base.
Key words: C/C composites; impregnation; coke fillers; microstructures
