Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (05): 116-123.doi: 10.13475/j.fzxb.20210505408

• Textile Engineering • Previous Articles     Next Articles

Key technology for compaction and densification of micro-porous plates made from 3-D four-directional carbon/carbon preforms

MEI Baolong1,2, DONG Jiuzhi1,2(), YANG Tao1,2, JIANG Xiuming1,2, REN Hongqing1,2   

  1. 1. School of Mechanical Engineering, Tiangong University, Tianjin 300387, China
    2. Tianjin Key Laboratory of Advanced Mechatronics Equipment Technology, Tiangong University, Tianjin 300387, China
  • Received:2021-05-24 Revised:2022-01-18 Online:2022-05-15 Published:2022-05-30
  • Contact: DONG Jiuzhi E-mail:dongjiuzhi@tiangong.edu.cn

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Abstract:

Aiming at the inconsistent density between layers of hand-woven 3-D four-directional carbon/carbon composite preforms, the mapping relationship between carbon fiber laying height and fiber volume content were established based on the prefabricated parts forming technology. Equal distance and density micro-porous plates were designed, and processing technique suitable for micro-porous plates was established to ensure uniform density of the preforms. In order to ensure good fiber fluidity during the compaction and densification process of the preforms, the fiber compression theory was applied and the optimization of the structure for equal-distance and density micro-porous plates was carried to reduce the porosity of the preform. Based on the control strategy of displacements-pressure double closed loop, a digital compaction device was developed for on-line dynamic control of the preform density and nondestructive compaction to ensure the uniform density between the preform layers. Compaction experiments of equal-distance and density micro-porous plates were carried out to verify the feasibility of the key technology of compaction and densification process and the preforms were examined with an industrial microscope. The results show that the uniformity of preforms compacted by the optimized equal-distance and density micro-porous plates is better, with the preform porosity reduced by 50% compared to the non-optimized preforms.

Key words: preform, compaction density, equal-distance and density micro-porous plates, digital compaction device, porosity

CLC Number: 

  • TS103.3

Fig.1

Process of 3-D four-direction C/C composite preform. (a)Laying 0°of carbon fiber;(b)Laying 120° of carbon fiber; (c)Laying 240°of carbon fiber;(d)Compaction and densification of single-cycle;(e)Compaction and densification of multiple-cycle;(f)Completion of compaction and densification process"

Fig.2

Compaction model of equal-distance and density micro-porous plates"

Fig.3

Force for micro-porous plate. (a)Force for top view of micro-porous plate;(b)Force for front view of micro-porous plate"

Tab.1

Force and displacement of micro-porous plates"

受力点
位移/mm		 压力/N
点A 点B 点C 点D
11.0 16.2 16.5 15.9 16.0
10.8 21.6 22.0 21.8 22.2
10.6 27.9 28.4 28.8 28.2
10.4 36.0 35.8 35.4 35.4
10.2 40.6 41.4 40.9 41.0

Fig.4

Model of micro-pore diameter"

Fig.5

Process model of micro-porous plate"

Fig.6

Element model"

Fig.7

Compaction model of micro-porous plate before (a) and after (b) optimization"

Fig.8

Micro-porous plate before (a) and after (b) optimization"

Fig.9

Compaction device"

Fig.10

Control principle of double closed loop"

Tab.2

Parameters of micro-porous platesmm"

优化前微孔板参数 优化后微孔板参数
ϕd Δl Δt φd Δl Δt
1.5 0 0 1.5 0.8 1.2

Fig.11

Microscopic morphology of the prefabricated parts. (a)Front view of compaction carbon fiber of micro-porous plate before optimization;(d)Front view of compaction carbon fiber of micro-porous plate after optimization;(c)Top view of compaction carbon fiber of micro-porous plate before optimization;(d)Top view of compaction carbon fiber of micro-porous plate after optimization"

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