(南昌航空大學(xué) 輕合金加工科學(xué)與技術(shù)國防重點學(xué)科實驗室，南昌 330063)
摘 要: 采用真空氣壓浸滲法制備纖維體積分?jǐn)?shù)為51%的三維五向編織M40碳纖維增強(qiáng)鋁基復(fù)合材料(3D-Cf/Al)，研究纖維預(yù)熱溫度對3D-Cf/Al復(fù)合材料顯微組織與力學(xué)性能的影響，并對比研究3D-Cf/Al復(fù)合材料與單向連續(xù)Cf/Al復(fù)合材料的差異。結(jié)果表明:復(fù)合材料致密度隨著編織體預(yù)熱溫度的提高而增大，提高預(yù)熱溫度可有效減少復(fù)合材料內(nèi)部孔洞和纖維偏聚等浸滲缺陷;復(fù)合材料的拉伸強(qiáng)度隨纖維預(yù)制體預(yù)熱溫度的提高而顯著降低。其中，在預(yù)熱溫度500 ℃、浸滲溫度720 ℃、浸滲壓力7 MPa和保壓時間20 min的工藝條件下，所制備的3D-Cf/Al復(fù)合材料致密度為97.3%，拉伸強(qiáng)度為777.8 MPa，彈性模量為186.1 GPa。
關(guān)鍵字: 三維編織;Cf/Al復(fù)合材料;纖維預(yù)熱溫度;力學(xué)性能;顯微組織
（National Defence Key Discipline Laboratory of Light Alloy Processing Science and Technology,
Nanchang Hangkong University, Nanchang 330063, China）
Abstract:The vacuum gas pressure infiltration was performed to prepare the 3D-Cf/Al composite reinforced 3D five-directional braided performs woven by M40 graphite fiber with the fiber volume fraction of 51%. The effects of preheating temperature on the microstructure and tensile strength of 3D-Cf/Al composites were studied, and the difference between 3D-Cf/Al composites and continuous Cf/Al composites were compared. The results show that the density of composite increases with the fiber preheat temperature increasing, the increase of the fiber preheat temperature can effectively reduce the infiltration defects, such as internal holes and partial fiber reunited. The tensile strength reduces significantly with the fiber preform preheating temperature increasing. Moreover, the density, tensile strength and elasticity modulus of the 3D-Cf/Al composites are 97.3%, 777.8 MPa and 186.1 GPa, respectively, when the preheating temperature, infiltration temperature, impregnation pressure and dwell time of the fiber are 500 ℃, 720 ℃, 7 MPa and 20 min.
Key words: 3D-woven; Cf/Al composite; fiber preheating temperature; mechanical property; microstructure
