导航

ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2021, Vol. 42 ›› Issue (9): 424488-424488.doi: 10.7527/S1000-6893.2020.24488

• Material Engineering and Mechanical Manufacturing • Previous Articles     Next Articles

High temperature compressive properties and failure mechanism of Cf/Al composites with different braided structures

LAN Zeyu, YU Huan, XU Zhifeng, SHUAI Liang, HU Yinsheng   

  1. Key Discipline Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University, Nanchang 330063, China
  • Received:2020-07-02 Revised:2020-07-23 Published:2020-09-14
  • Supported by:
    National Natural Science Foundation of China (51765045); Aeronautical Science Foundation of China (2019ZF056013)

Abstract: The compressive properties of Cf/Al composites with four different braided structures prepared by vacuum pressure infiltration method, i.e. 3D five direction, 3D orthogonal, laminated puncture and 2.5D shallow-straight joint woven, are tested at 350℃ and 400℃, respectively. The high-temperature compressive properties of Cf/Al composites with different braided structures and the influence of temperature on the compressive properties are discussed, the fracture morphology of laminated puncture structures is further observed by SEM and the compressive failure mechanism is analyzed. The results show different compressive properties of composites with different braided structures at high temperature. The compressive strength of the 3D orthogonal structure is higher, which are 351.4 MPa and 288.6 MPa at 350℃ and 400℃, respectively, while that of the 2.5D shallow orthogonal structure is lower, which are 87.3 MPa and 52.2 MPa, respectively. Meanwhile, a large difference exists in high temperature stability. When the temperature rises from 350℃ to 400℃, the compressive strength of the 2.5D shallow-straight joint woven decreases by about 40.2% with poor high-temperature compressive stability. The compressive strength of the laminated puncture decreases by about 4.0%, with good high-temperature compressive stability. The high temperature compressive failure process of the laminated puncture structure composite materials can be divided into two stages according to the characteristics of tangent modulus:the first stage is when the base alloy bears the main load, and the second stage is when the base alloy and the reinforced fiber bear the load together.

Key words: carbon fiber, braided structure, composite, high temperature, compressive property, failure mechanism

CLC Number: