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后高温热处理对C/C-SiC复合材料微观结构及其力学性能的影响

马飞 罗浩 孙守业 史祥东 罗瑞盈 郭灵燕

马飞, 罗浩, 孙守业, 等. 后高温热处理对C/C-SiC复合材料微观结构及其力学性能的影响[J]. 复合材料学报, 2024, 42(0): 1-11.
引用本文: 马飞, 罗浩, 孙守业, 等. 后高温热处理对C/C-SiC复合材料微观结构及其力学性能的影响[J]. 复合材料学报, 2024, 42(0): 1-11.
MA Fei, LUO Hao, SUN Shouye, et al. Effects of high temperature heat treatment on the micro structure and mechanical performance of C/C-SiC composite materials[J]. Acta Materiae Compositae Sinica.
Citation: MA Fei, LUO Hao, SUN Shouye, et al. Effects of high temperature heat treatment on the micro structure and mechanical performance of C/C-SiC composite materials[J]. Acta Materiae Compositae Sinica.

后高温热处理对C/C-SiC复合材料微观结构及其力学性能的影响

基金项目: 内燃机与动力系统全国重点实验室开放课题(WCDL-GH-2020-0242)
详细信息
    通讯作者:

    罗浩,博士,研究方向为陶瓷基复合材料制备与性能研究 E-mail: luohao01@buaa.edu.cn

  • 中图分类号: TB332

Effects of high temperature heat treatment on the micro structure and mechanical performance of C/C-SiC composite materials

Funds: Open Project of National Key Laboratory for Internal combustion and Power Systems (WCDL-GH-2020-0242)
  • 摘要: 后高温热处理对反应熔融浸渗法(RMI)制备C/C-SiC复合材料的微观结构与性能有着至关重要的影响。为研究后高温热处理对RMI制备C/C-SiC复合材料微观结构和力学性能影响及机制,本研究通过等温化学气相渗透法(CVI)工艺,以天然气为碳源气体,氮气为载气和稀释气体,在碳纤维预制体内部沉积热解碳基体,制得密度为1.2 g/cm3的C/C多孔体,然后通过反应熔融浸渗法制备出C/C-SiC复合材料,研究了不同后高温热处理温度对C/C-SiC复合材料相组成、内应力及力学性能的影响。将制备得到的C/C-SiC复合材料分别在1300℃、1500℃和1700℃下进行后高温热处理,研究了后高温热处理对C/C-SiC复合材料密度、孔隙率、基体成分、内应力以及对弯曲性能的影响。结果表明:经1300℃、1500℃及1700℃后热处理后,C/C-SiC复合材料的密度降低,开孔率增加,SiC基体含量上升,SiC基体的分布更为广泛,同时还伴随有残余Si挥发产生的大孔,残余Si含量显著降低。在1300℃、1500℃和1700℃的后热处理导致弯曲强度先增加后减小,1500℃后处理时弯曲强度最大为296.52 MPa,随着后处理温度提高,弯曲模量降低,1700℃后热处理下降程度最大。

     

  • 图  1  后热处理对复合材料密度和孔隙率的影响:(a) 密度;(b)孔隙率

    Figure  1.  Effect of post heat treatment on density and porosity of composite materials: (a) Density; (b) Porosity

    图  2  后热处理对复合材料SiC基体含量及残余硅含量的影响:(a) SiC基体含量的变化;(b)残余Si含量的变化

    Figure  2.  The effect of post heat treatment on the content of SiC matrix and residual silicon in composite materials: (a) Changes in SiC matrix content;(b) Changes in residual Si content

    图  3  2250-PR-1300试样的SEM图片。(a) 整体结构;(b) 0°无纬布;(c) 碳毡;(d)针刺纤维;(e) 90°无纬布;(f) 纤维与基体炭之间的结合

    Figure  3.  SEM images of samples 2250-PR-1300. (a) Overall structure; (b) 0°weft free fabric; (c) Carbon felt; (d) Acupuncture fibers; (e) 90°weft free fabric; (f) The bonding between fibers and matrix carbon

    图  4  2250-PR-1500试样的SEM图片。(a) 整体结构;(b) 0°无纬布;(c) 碳毡;(d)针刺纤维;(e) 90°无纬布;(f) 纤维与基体炭之间的结合

    Figure  4.  SEM image of 2250-PR-1500 sample. (a) Overall structure; (b) 0°weft free fabric; (c) Carbon felt; (d) Acupuncture fibers; (e) 90°weft free fabric;(f) The bonding between fibers and matrix carbon

    图  5  2250-PR-1700试样的SEM图片。(a) 纤维与基体炭之间的结合;(b)碳毡; (c) 0°无纬布;(d)针刺纤维; (e) 90°无纬布; (f) 整体结构

    Figure  5.  SEM image of 2250-PR-1700 sample. (a) Overall structure; (b) 0°weft free fabric; (c) Carbon felt; (d) Acupuncture fibers; (e) 90°weft free fabric; (f) The bonding between fibers and matrix carbon

    图  6  经不同温度后热处理后C/C-SiC复合材料的XRD图谱

    Figure  6.  XRD patterns of C/C-SiC composites after heat treatment at different temperatures

    图  7  经不同温度后热处理后C/C-SiC复合材料XRD图谱的谱峰偏移:(a) SiC (111)晶面的谱峰偏移;(b) SiC (220) 晶面的谱峰偏移; (c) SiC (311) 晶面的谱峰偏移; (d) 石墨炭(002)晶面的谱峰偏移

    Figure  7.  The peak shift of the XRD spectrum of C/C-SiC composite material after heat treatment at different temperatures: (a) Spectral peak shift of SiC (111) crystal plane; (b) Spectral peak shift of SiC (220) crystal plane; (c) Spectral peak shift of SiC (311) crystal plane;(d) Spectral peak shift of graphite (002) crystal surface

    图  8  不同后热处理温度处理后C/C-SiC复合材料的拉曼Mapping图:(a) 2250-PR mapping图; (b) 2250-PR-1300 mapping图;(c) 2250-PR-1500 mapping图; (d) 2250-PR-1700 mapping图

    Figure  8.  Raman Mapping of C/C-SiC composite materials treated at different post heat treatment temperatures: (a) 2250-PR mapping diagram; (b) 2250-PR-1300 mapping diagram; (c) 2250-PR-1500 mapping diagram; (d) 2250-PR-1700 mapping diagram.

    图  9  2250-PR-1300、2250-PR-1500及2250-PR-1700弯曲试样断口的SEM图。(a) 和(b) 1300℃后热处理; (c) 和(d)1500℃后热处理; (e) 和(f)1700℃后热处理

    Figure  9.  SEM images of the fracture surface of 2250-PR-1300、2250-PR-1500 and 2250-PR-1700 bending specimens. (a) and (b) Heat treatment after 1300℃; (c) and (d) Heat treatment after 1500℃; (e) and (f) Heat treatment after 1700℃

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出版历程
  • 收稿日期:  2023-11-06
  • 修回日期:  2023-12-28
  • 录用日期:  2023-12-29
  • 网络出版日期:  2024-03-04

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