Graphitization uniformity and mechanical properties of laser irradiated carbon fiber

doi:10.16085/j.issn.1000-6613.2024-0304

Abstract

Abstract:

In order to solve the problem of uneven graphitization and large modulus difference of laser irradiation of carbon fiber, the experiments studied the unilateral and bilateral gaussian laser irradiation of carbon fibers, and determined that the unevenness of carbon fiber graphitization was caused by the uneven temperature, and laser intensity distribution and fiber beam heat transfer led to the uneven temperature. The discreteness of the mechanical properties of carbon fiber was statistically analyzed by the Weibull distribution function. The results showed that the graphitization uniformity of thin-layered carbon fibers irradiated by top-hat laser irradiation was significantly improved, and the average tensile modulus was increased from 227.37GPa to 311.90GPa, an increase of 37.18%, compared with direct gaussian laser irradiation. The coefficient of variation of tensile modulus of thin-layered carbon fiber irradiated by top-hat laser was reduced from 44% to 12%, the Weibull modulus of modulus was significantly increased, and the discreteness was reduced.

Key words: carbon fiber, graphitization, laser, mechanical property, Weibull

摘要：

为解决激光辐照碳纤维石墨化不均匀、模量差别大的问题，本文通过实验研究了单、双侧高斯激光辐照碳纤维，确定了碳纤维石墨化不均匀性是由激光光强分布和纤维束传热引起的温度不均导致的，采用光强分布均匀的平顶激光辐照薄层化碳纤维显著提高了碳纤维石墨化的均匀性，对比了高斯激光直接辐照碳纤维与平顶激光辐照薄层化碳纤维的力学性能变化，通过Weibull分布函数对碳纤维力学性能的离散性进行统计分析。结果表明：通过平顶激光辐照的薄层化碳纤维的石墨化均匀性得到显著提高，平均拉伸模量从227.37GPa提高至311.90GPa，提高了37.18%；相较于高斯激光直接辐照，平顶激光辐照的薄层化碳纤维的拉伸模量变异系数由44%降低至12%，拉伸模量的Weibull模数显著提高，离散性降低。

关键词: 碳纤维, 石墨化, 激光, 力学性能, Weibull

CLC Number:

TB332

WAN Kai, YANG Weimin, DING Qisheng, YIN Rongzheng, LI Haoyi, TAN Jing. Graphitization uniformity and mechanical properties of laser irradiated carbon fiber[J]. Chemical Industry and Engineering Progress, 2025, 44(2): 1025-1032.

万凯, 杨卫民, 丁奇胜, 殷荣政, 李好义, 谭晶. 激光辐照碳纤维石墨化均匀性及力学性能[J]. 化工进展, 2025, 44(2): 1025-1032.

Figures/Tables 17

采样点	D峰		G峰		R
采样点	拉曼位移/cm^-1	FWHM	拉曼位移/cm^-1	FWHM	R
GCFs-1-1-1	1350.94	40.04	1580.07	34.12	0.73
GCFs-1-1-2	1347.61	47.32	1578.90	21.62	0.50
GCFs-1-1-3	1352.30	39.27	1579.46	19.62	0.40
GCFs-1-1-4	1350.82	90.53	1579.02	16.92	0.11
GCFs-1-1-5	1351.53	39.21	1579.04	20.92	0.43
GCFs-1-1-6	1347.49	43.81	1575.49	23.40	0.48
GCFs-1-1-7	1349.04	87.48	1585.93	65.39	1.04

样本	R最小值	R最大值	R平均值	标准差	变异系数/%
GCFs-1
GCFs-1-1	0.11	1.04	0.53	0.27	51
GCFs-1-2	0.47	1.25	0.87	0.24	28
TCFs-1
TCFs-1-1	0.15	0.39	0.23	0.08	34
TCFs-1-2	1.38	1.57	1.48	0.07	5
TCFs-2
TCFs-2-1	0.28	0.37	0.33	0.03	10
TCFs-2-2	0.54	0.66	0.61	0.04	6
TCFs-3
TCFs-3-1	0.17	0.36	0.26	0.07	27
TCFs-3-2	0.21	0.37	0.29	0.05	18

样品	2 $θ /$ (°)	$d_{(002)} /$ nm	$L_{c} / n m$	$L_{a} / n m$	n
未经处理	24.93	0.357	0.98	3.20	2.74
TCFs-60A	25.02	0.356	1.08	3.29	3.02
TCFs-70A	25.17	0.354	1.05	3.28	2.98
TCFs-80A	25.44	0.350	1.34	5.77	3.84
TCFs-90A	25.64	0.347	1.84	12.57	5.29

样品	2 $θ /$ (°)	$d_{(002)} /$ nm	$L_{c} / n m$	$L_{a} / n m$	n
未经处理	24.93	0.357	0.98	3.20	2.74
TCFs-60A	25.02	0.356	1.08	3.29	3.02
TCFs-70A	25.17	0.354	1.05	3.28	2.98
TCFs-80A	25.44	0.350	1.34	5.77	3.84
TCFs-90A	25.64	0.347	1.84	12.57	5.29

样本	化学键				元素		O/C
样本	C $\overset{}{̿}$ C/%	C—C/%	C—O/%	C $\overset{}{̿}$ O/%	C/%	O/%	O/C
原样未处理	8.03	59.09	25.21	7.66	58.22	40.87	0.70
激光处理后	30.33	54.91	6.46	8.29	93.99	6.01	0.06

样本	化学键				元素		O/C
样本	C $\overset{}{̿}$ C/%	C—C/%	C—O/%	C $\overset{}{̿}$ O/%	C/%	O/%	O/C
原样未处理	8.03	59.09	25.21	7.66	58.22	40.87	0.70
激光处理后	30.33	54.91	6.46	8.29	93.99	6.01	0.06

样本	拉伸强度			拉伸模量			平均断裂伸长率 $/ %$
样本	平均拉伸强度 $\bar{σ} / G P a$	强度标准差 $S_{σ} / G P a$	强度变异系数 $C V_{σ} / %$	平均拉伸模量 $\bar{E} / G P a$	模量标准差 $S_{E} / G P a$	模量变异系数 $C V_{E} / %$	平均断裂伸长率 $/ %$
CFs	3.40	0.36	11	227.37	34.83	15	1.52
GCFs	3.01	0.59	19	316.98	140.82	44	1.05
TCFs	2.78	0.33	12	311.90	36.15	12	0.90

样本	拉伸强度			拉伸模量			平均断裂伸长率 $/ %$
样本	平均拉伸强度 $\bar{σ} / G P a$	强度标准差 $S_{σ} / G P a$	强度变异系数 $C V_{σ} / %$	平均拉伸模量 $\bar{E} / G P a$	模量标准差 $S_{E} / G P a$	模量变异系数 $C V_{E} / %$	平均断裂伸长率 $/ %$
CFs	3.40	0.36	11	227.37	34.83	15	1.52
GCFs	3.01	0.59	19	316.98	140.82	44	1.05
TCFs	2.78	0.33	12	311.90	36.15	12	0.90

样本	拉伸强度			拉伸模量
样本	$m$	尺寸参数 $σ_{0} / G P a$	相关系数 $R_{σ}^{2}$	$m$	尺寸参数 $E_{0} / G P a$	相关系数 $R_{E}^{2}$
CFs	11.78	3.56	0.978	2.99	283.96	0.890
GCFs	5.56	3.25	0.960	2.37	358.82	0.846
TCFs	7.80	2.93	0.842	8.55	328.67	0.885

样本	拉伸强度			拉伸模量
样本	$m$	尺寸参数 $σ_{0} / G P a$	相关系数 $R_{σ}^{2}$	$m$	尺寸参数 $E_{0} / G P a$	相关系数 $R_{E}^{2}$
CFs	11.78	3.56	0.978	2.99	283.96	0.890
GCFs	5.56	3.25	0.960	2.37	358.82	0.846
TCFs	7.80	2.93	0.842	8.55	328.67	0.885

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