连续Cf/Al复合材料板双辊铸轧制备及力学性能研究

Preparation and mechanical properties of continuous Cf / Al composite plate by twin-roll casting

摘要:

本文利用电镀工艺制备了表面镀镍碳纤维，通过双辊铸轧短流程成型工艺成功制备了连续碳纤维增强铝基（Cf/Al）复合材料板，研究了浇注温度对铸轧复合材料板的微观组织、界面特征、断口形貌和力学性能的影响。结果表明，浇注温度为963～983K，轧制速度为2.7m/min，辊缝为2.0mm的条件下可制备出表面平整、无明显表面缺陷的Cf/Al铸轧复合材料板；其中，浇注温度为973K时，碳纤维与铝基体之间界面结合良好；纤维表面金属镍层明显改善了碳纤维与铝基体之间的浸润性，镍镀层还有效抑制了Al4C3脆性相的产生，使Cf/Al复合材料板力学性能大幅提升，其中浇注温度973K铸轧的Cf/Al复合材料板抗拉强度比初始的38.2MPa提高了87.4%。

关键词:双辊铸轧;连续Cf/Al复合材料板;力学性能;浇注温度

Abstract:

In this paper, Ni-coated carbon fiber was prepared by electroplating process, and continuous carbon fiber reinforced Al matrix (Cf/Al) composite plate was successfully prepared via twin-roll casting and short process forming process, and the effect of pouring temperature on the microstructure, interface characteristics, fracture morphology and mechanical properties of the Cf/Al composites was investigated. The results indicate that the Cf/Al composite plate with smooth and no obvious surface defects were fabricated under the conditions of pouring temperature of 963-983K, rolling speed of 2.7m/min and roll gap of 2.0mm; Among them, when the pouring temperature is 973K, the interface between the carbon fiber and the Al-matrix is ??well bonded; Ni-coated on the surface of fiber significantly improves the wettability between carbon fiber and aluminum matrix, and also effectively inhibits the formation of Al4C3 brittle phase, which greatly improves the mechanical properties of Cf/Al composite strip. The tensile strength of the Cf/Al composite plate at a pouring temperature of 973K increased by 87.4% compared with the initial 38.2MPa.

Key words:twin-roll casting; continuous Cf/Al composite strip; mechanical properties; pouring temperature