Technological process and performance  of C/C composites densified with directional pulse airflow TG-CVI method

Abstract

Abstract: Taking the liquefied gas as carbon source precursor and the nitrogen as dilution gas, the general carbon felt with initial density of 0.14 g·cm^－3 was densified by means of directional pulse airflow TG-CVI method. The densification process and density distribution of the C/C composites were studied under different experimental conditions. The microstructure, fracture morphology and flexural strength of the C/C composites were investigated by using polarized light microscopy, scanning electron microscopy and three-point bending method. The result showed that under condition of hot side temperature of 1 080 ℃ and pulse pressure of -3~0 kPa, the appearance density of the C/C composites after densified for 70 h would be 1.836 g·cm^－3 with uniform density distribution. The microstructure would be a mixed structure of rough laminae(RL) with smooth laminae(SL).The fracture morphology of the samples would exhibit a progressive serrated distribution and the fibers would mainly be of pullout, showing a pseudoplastic fracture feature. In addition, the flexural strength would be 83.91 MPa.

Key words: C/C composite, directional pulse airflow TG-CVI, microstructure, flexural strength

CLC Number:

TB332

JI Gen-shun, ZHAO Hao, JIA Jian-gang, ZHANG ShengLI Zhou, HAO Xiang-zhong. Technological process and performance of C/C composites densified with directional pulse airflow TG-CVI method[J]. Journal of Lanzhou University of Technology, 2020, 46(1): 20-23.

References

[1] 季根顺,刘金欣,贾建刚,等.化学液相沉积温度对C/C复合材料致密化行为及显微结构的影响 [J].兰州理工大学学报,2018,44(6):30-34.
[2] 樊桢,余立琼,李炜,等.高导热碳/碳复合材料的设计与制备 [J].中国材料进展,2017,36(5):369-376.
[3] 李贺军.炭/炭复合材料 [J].新型炭材料,2001,16(2):79-80.
[4] GOLECKI.Rapid vapor-phase densification of refractory composites [J].Materials Science & Engineering R Reports,1997,20(2):37-124.
[5] DELHAES P.Chemical vapor deposition and infiltration processes of carbon materials [J].Carbon,2002,40(5):641-657.
[6] ZHANG W G,HTTINGER K J.Densification of a 2D carbon fiber preform by isothermal,isobaric CVI:kinetics and carbon microstructure [J].Carbon,2003,41(12):2325-2337.
[7] TOLBIN A Y,SPITSYN B V,SERDAN A A,et al.Pyrolytic densification of porous carbon-carbon composite materials [J].Inorganic Materials,2013,49(1):49-56.
[8] 白瑞成,李贺军,席琛,等.碳/碳复合材料ICVI工艺的研究进展 [J].材料导报,2005,19(4):81-84.
[9] LIEBERMAN M L,PIERSON H O.Effect of gas phase conditions on resultant matrix pyrocarbons in carbon/carbon composites [J].Carbon,1974,12(3):233-241.
[10] TANG Z H,QU D N,XIONG J,et al.Effects of infiltration conditions on the densification behavior of carbon/carbon composites prepared by a directional-flow thermal gradient CVI process [J].Carbon,2003,41(14):2703-2710.
[11] 和永岗,李克智,魏建锋,等.超短气体滞留时间制备C/C复合材料及其组织研究 [J].材料工程,2009(9):33-37.
[12] ZHANG W G,HU Z J,HTTINGER K J.Chemical vapor infiltration of carbon fiber felt:Optimization of densification and carbon microstructure [J].Carbon,2002,40(14):2529-2545.
[13] DONG G L,HTTINGER K J.Consideration of reaction mechanisms leading to pyrolytic carbon of different textures [J].Carbon,2002,40(14):2515-2528.
[14] LIEBERMAN M L.Kinetic factors in the chemical vapor deposition of carbon from methane [J].Carbon,1975,11(6):243-244.
[15] 吴凤秋.炭/炭复合材料的力学性能及其断裂机理的研究 [D].长沙:中南大学,2002.

Technological process and performance of C/C composites densified with directional pulse airflow TG-CVI method

PDF

Knowledge

Abstract

Cite this article

share this article

References

Related Articles 15

Recommended Articles

Metrics

Comments

[1]	ZHAO Yan-chun, SHI Zi-qiang, ZHANG Lin-hao, ZHANG Min-ya, KOU Sheng-zhong. Effect of homogenization treatment on the microstructure and mechanical properties of Fe-based medium entropy alloys [J]. Journal of Lanzhou University of Technology, 2023, 49(1): 1-6.
[2]	LI Hong-wei, MA Li-na, ZHANG Yan-hui, LI Bo-sheng. Life prediction model of cement-based composite cored wallboard based on Wiener degradation under dry-wet cycles [J]. Journal of Lanzhou University of Technology, 2023, 49(1): 22-29.
[3]	WANG Yi, YIN Xiang, ZHOU Kai, WANG Xin-min WANG Xin-hua, REN Jun-qiang. Effect of process parameters on microstructure and properties of Ni60-Cu/BaF₂·CaF₂directional structure coating [J]. Journal of Lanzhou University of Technology, 2022, 48(4): 11-18.
[4]	ZHAO Yan-chun, LI Ze-feng, WANG Bo, KOU Sheng-zhong, LI Wen-sheng. Research on mechanical properties of multi-component iron-based amorphous composite [J]. Journal of Lanzhou University of Technology, 2021, 47(6): 1-5.
[5]	LI Ya-min, ZHOU Sheng-rui, HU Wei. Microstructure and properties of K4169 superalloy with nano polycrystalline reinforcement [J]. Journal of Lanzhou University of Technology, 2021, 47(4): 1-5.
[6]	BI Guang-li , CHEN Si-qi, JIANG Jing, LI Yuan-dong ZHANG Yu-sheng, JIANG Chun-hong. Microstructure, mechanical and corrosion properties of an as-extruded Mg-Dy-Ni alloy modified by sliding friction treatment [J]. Journal of Lanzhou University of Technology, 2021, 47(4): 13-21.
[7]	YIN Yan, DONG Kai-ji, LI Zhi-heng, BO Yao, LU Chao, ZHANG Rui-hua. Characterization of Fe-Cr alloy powder prepared by close-coupled vacuum induction melting gas atomization [J]. Journal of Lanzhou University of Technology, 2021, 47(3): 10-14.
[8]	ZHAO Yan-chun, WANG Bo, LI Ze-feng, SUN Hao, KOU Sheng-zhong. Study on magnetic properties of Fe-based amorphous composites [J]. Journal of Lanzhou University of Technology, 2021, 47(2): 1-6.
[9]	CHENG Jian-hong, XIAO Le, CHEN Yong-qing, YAN Ying-jie, CAO Rui. The effect of hot isostatic pressing temperature on the microstructure and tensile properties of TC4 alloy [J]. Journal of Lanzhou University of Technology, 2021, 47(1): 1-4.
[10]	BI Guang-li, XU Zuo-cheng, GU Jia-rui, JIANG Jing, JIANG Chun-hong, LI Yuan-dong. Microstructure, age-hardening behavior and mechanical properties of Mg-7Sn-Zn(Y) alloy [J]. Journal of Lanzhou University of Technology, 2020, 46(6): 1-8.
[11]	HUANG Yong, YANG Xiao-juan, RAN Xiao-long. Effect of compression/diameter ratio on pure copper butt cold-welded welded joints [J]. Journal of Lanzhou University of Technology, 2020, 46(6): 28-32.
[12]	LA Pei-qing, WANG Jiao, XIAO Hai-bo, ZHENG Yue-hong, YANG Li-jie, SHENG Jie. Microstructure and properties of annealed MoCrFeMnNi high entropy alloys [J]. Journal of Lanzhou University of Technology, 2020, 46(5): 1-6.
[13]	GU Yu-fen, GENG Pei-biao, SHI Yu, LI Guang, GUO Jin-chang. Effect of laser power on microstructure and properties of laser nitriding layer of TC4 alloy [J]. Journal of Lanzhou University of Technology, 2020, 46(4): 10-14.
[14]	TIAN Hui, LI Li, ZHANG Kun, WANG Peng. Effects of dry-wet and freeze-thaw cycles on microstructure of soil based on SEM [J]. Journal of Lanzhou University of Technology, 2020, 46(4): 122-127.
[15]	ZHAO Yan-chun, JIANG Jian-long, MAO Rui-peng, SUN Hao, KOU Sheng-zhong. Influence of Zr atom fraction on corrosion resistance behavior of Ti-based amorphous composite [J]. Journal of Lanzhou University of Technology, 2020, 46(2): 7-12.