Research and discussion on processing technology of carbon fiber reinforced carbon matrix composites
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摘要: 碳纤维增强碳基复合材料(C/C)具有热膨胀系数低、耐腐蚀、抗热冲击、耐磨损等特点,在武器装备、航空航天、汽车制造等领域得到日益广泛的应用。传统加工技术难以实现对C/C复合材料的高精度加工。激光加工技术对加工对象的尺寸、材质和形状要求低,易与其他先进加工技术相结合,具有其他加工方法所不具备的优势。本论文主要对C/C复合材料的制备、应用和加工方式进行了论述,详细阐述了激光加工C/C复合材料的原理机制和工艺特点,以及不同应用场合下加工工艺的选择策略。通过传统加工方法和特种加工方法的对比,概述了加工C/C复合材料所面临的问题和挑战,提出了C/C复合材料激光加工与其他先进制造技术相结合的发展趋势。Abstract: Carbon fiber reinforced carbon matrix composites (C/C) have the characteristics of low thermal expansion coefficient, corrosion resistance, thermal shock resistance, and wear resistance, which are widely used in military equipment, aerospace, automobile manufacturing and other fields. But it is difficult to achieve high precision machining of C/C composites by traditional processing technology. Laser processing technology has low requirements for the size, material and shape. It is easy to combine with other advanced processing technologies and has the characteristics that other methods do not have. This paper mainly reviews the preparation, application and processing methods of C/C composites, elaborates the mechanism and process characteristics of laser processing of C/C composites and the selection strategy of processing technology in different applications. Through the comparison of traditional processing methods and special processing methods, the problems and challenges faced by the processing of C/C composites are summarized, and the development trend of the combination of laser processing of C/C composites and other advanced manufacturing technologies is proposed.
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Janus材料因其独特的结构或组成的不对称性展现出很多特殊的功能,近年来为人们所广泛关注[1-4]。目前,Janus材料在乳化剂[5]、自驱动马达[6]、药物释放[7]、催化[8]和柔性可穿戴[9]等众多领域都展现出巨大的应用前景。自1991年被诺贝尔奖获得者De Gennes[1]首次提出以来,经过30多年的发展,已经有多种不同组成或形貌结构的Janus材料被合成出来,从组成来分类,主要有聚合物/聚合物型、无机物/无机物型及聚合物/无机物型;从形貌来区分,包括颗粒状[10]、棒状[11]、片状[12]、锥状[13]及雪人状[14]等。
不同于传统Janus材料,Janus中空球在空间结构上中心对称,其非对称性体现在内外表面的化学组成和性质上,这种独特的结构使其可以用作特殊微容器,用于分离富集、传输和受限反应等[15-19]。但是,研究发现,完整致密的壳层会限制微球和环境之间的物质传输[15]。因此,为了提高Janus微球和环境之间的物质传输速率,引入了贯穿壳层的孔道,即Janus笼。目前,已经有多种功能Janus笼被制备出来,作为高效传输的微反应容器,在水处理、催化,环境响应富集释放等方向展现出一定的应用前景[20-23]。
课题组在之前的工作中,最早提出了乳液界面溶胶凝胶法制备二氧化硅Janus中空球的方法[24]。进而在此基础上通过两种表面活性剂在乳液界面发生微相分离在中空球表面形成通孔,同时引入磁性纳米粒子并在中空球内腔接枝温敏性聚合物,得到热敏性的聚合物-无机物复合功能Janus笼[22]。但是,在之前的研究中也发现,Janus笼的表面孔径很难调控,孔径也只能限制在50 nm以下,如果想要通过增加致孔表面活性剂的量得到更大孔径的笼,不仅孔径变化不大,而且还会导致壳层局部呈不连续结构,在表面形成二氧化硅小颗粒,进而破坏球形结构,无法得到完整的中空球。
基于这些考虑,在此提出了新的研究思路,先用烷基和末端带卤素基团的硅烷偶联剂代替带活性双键的硅烷偶联剂,壳层依旧引入磁性纳米颗粒,先制备出支撑性良好、孔径大范围可调的无机Janus笼,进而利用可控自由基聚合代替自由基聚合,在更温和的反应条件下在内腔接枝pH响应性聚合物,得到支撑性好、孔径大范围可调的功能有机/无机功能复合Janus笼,并验证了其可以在改变环境pH的条件下实现对油相的可控吸收和释放,以及在磁操控下实现装载物的定向传输,有望用于药物装载和体内靶向释放等领域。
1. 实验材料及方法
1.1 原材料
无水三氯化铁(FeCl3,分析纯)、油酸钠(分析纯)、油酸(分析纯)、吐温80(Tween 80,化学纯)、十二烷基硫酸钠(SDS,化学纯)、铜粉(分析纯)和52#石蜡(熔点50~52℃)购自国药集团化学试剂有限公司;3-氨丙基三乙氧基硅烷(APTES,98%)、香豆素-6 (98%)、荧光素5-异硫氰酸酯(FITC,95%)、三乙胺(99%)、正辛基三乙氧基硅烷(98%)和2-溴-2-甲基丙酰溴(98%)购自北京百灵威科技有限公司;正硅酸乙酯(分析纯)、甲醇(分析纯)、正癸烷(分析纯)和甲苯(分析纯)购自西陇科学股份有限公司;1, 1-双十八烷基-3, 3, 3, 3-四甲基吲哚羰花青高氯酸盐(dil-C18,98%)和甲基丙烯酸二乙氨基乙酯(DEAEMA,>98.5%)购自西格玛奥德里奇(上海)贸易有限公司(Sigma-Aldrich);三[2-(二甲氨基)乙基]胺(Me6TREN,97%)购自梯希爱(上海)化成工业发展有限公司(TCI);预水解的苯乙烯马来酸酐共聚物水溶液(HSMA,10wt%)为自制。
1.2 实验方法
1.2.1 样品制备
(1) 磁性无机Janus笼的制备。取0.3 g合成的油溶性磁性Fe3O4颗粒[25]、1.1 g APTES、0.88 g正辛基三乙氧基硅烷和5.2 g正硅酸乙酯加入到25 g正癸烷中混合均匀作为油相;将15 mL 10wt%的HSMA的水溶液加入75 mL水中,用2 mol/L HCl调pH为3~4。然后再加入0.03 g Tween 80,混合均匀,作为水相。混合水油两相,用高速剪切机(Fluko FA25,德国Fluko)在12000 r/min的速度下剪切乳化3 min。将剪切所得乳液转移至三口瓶中,70℃反应12 h,得到磁性无机Janus笼。
(2) 末端Br基硅烷偶联剂的合成。将4.31 g APTES和2.55 g三乙胺(TEA)加入到20 mL甲苯中,通氮气30 min。再将5.95 g溴代异丁酰溴(BiBB)溶解于10 mL甲苯中,加入到恒压漏斗中。在冰浴条件下,缓慢的将溴代异丁酰溴甲苯溶液缓慢滴加到体系中,磁力搅拌过夜后,离心除去下层白色沉淀后,旋蒸除去甲苯,即得到末端为溴基的硅烷偶联剂。
(3) pH响应性磁性复合Janus笼的制备。将10 mg 铜粉和50 mg上述步骤(1)合成的磁性无机Janus笼分散到36 mL水中,通氮气30 min。将0.2 g DEAEMA和30 μL配体Me6TREN分散到18 mL甲醇中,通氮气30 min后和水相混合,在50℃水浴中反应12 h。磁分离,用乙醇洗涤3次,真空干燥,得到内表面接枝有PDEAEMA的磁性聚合物/无机磁性复合Janus笼。
1.2.2 复合Janus笼pH响应性吸释实验
(1) 复合Janus笼对油相的pH响应性吸释和磁分离。在0.2 g甲苯中加入少量油溶性荧光染料dil-C18染色,在样品瓶中将10 mg磁性复合Janus笼分散在5 g水中,再加入染色甲苯,调节pH至5,此时水油两相明显分层,再调节pH至9,振荡吸附,甲苯层消失,用磁铁吸附,吸附有甲苯的复合Janus笼即在磁铁一侧的瓶壁处富集,将pH调回5,振荡静置后用磁铁吸附,甲苯层重新出现;同样在0.2 g甲苯中加入少量油溶性荧光染料dil-C18染色,在样品瓶中将10 mg磁性复合Janus笼分散在5 g水中,再加入染色甲苯,调节pH至5,此时水油两相明显分层,保持pH值不变,振荡后用磁铁吸附,甲苯无法被复合Janus笼吸附。
(2) 复合Janus笼在荧光显微镜下的pH响应性吸释:将50 mg磁性复合Janus笼分散在10 g水中,加入水溶性荧光燃料FITC进行染色标记。将0.5 g加入少量香豆素-6荧光染料染色的甲苯加入到溶解有10 mg表面活性剂SDS的10 g水中,超声乳化得到水包油乳液。将FITC标记的复合Janus笼水分散液加入到乳液中,调节pH至9左右,避光搅拌,分别在磁分离复合Janus笼前后在荧光显微镜(Olympus IX83,日本Olympus)下观察;再调节pH至5左右,避光搅拌,同样分别在磁分离复合Janus笼前后在荧光显微镜下观察。
2. 结果与讨论
2.1 磁性无机Janus笼的制备、孔径调节与表征
在之前制备复合Janus笼时,课题组是将硅烷前驱体和聚合物单体同时溶解在油相中,一步得到有机/无机复合Janus多孔球[22]。但是多孔球的孔径只能在50 nm左右且难以调节,对应的致孔表面活性剂Tween 80在水相的浓度在0.22wt%以下,当Tween 80浓度继续升高时,会使多孔球外表面生成SiO2小颗粒,进而破坏球形结构。
本文用正辛基三乙氧基硅烷代替含活性双键的硅烷偶联剂作为球壳内侧接枝亲油基团的硅前驱体,同时将制备的油溶性Fe3O4纳米颗粒分散在油相中,得到外侧为氨基,内侧为烷基的磁性无机Janus笼。样品分别在扫描电子显微镜(SEM,带有元素分析 EDX的Quanta FEG 250,美国 FEI)和透射电子显微镜(TEM,JEM-1011,日本 JEOL)下进行观察,如图1所示。Janus笼的直径约为1~3 μm,孔径约为200~400 nm (图1(a)、图1(b)),同时不同于内侧接枝活性双键的无机Janus笼,即使没有聚合物的支撑,内侧为正辛基硅烷修饰的Janus笼也不会塌缩。进而对无机Janus笼进行超声粉碎,可以得到表面具有孔道的磁性Janus片(图1(c))。对得到的Janus片进行包埋切片,在TEM下观察,如图1(d)所示,可以看到磁性纳米粒子镶嵌在壳层中。
调节致孔表面活性剂Tween 80的加入量,即可对Janus笼球壳表面的通孔孔径进行调节。如图2所示,Tween 80在水相的浓度分别为0.01wt% (图2(a))、0.02wt% (图2(b))、0.04wt% (图2(c))和0.08wt% (图2(d))时,其表面孔径可从40 nm左右增加到约1 μm。
图 1 内侧修饰正辛基的磁性无机Janus笼的SEM图像 (a) 和TEM图像 (b);由磁性无机Janus笼破碎得到的Janus多孔片的SEM图像 (c) 和甲基丙烯酸甲酯(MMA)包埋切片后的TEM图像 (d)Figure 1. SEM image (a) and TEM image (b) of magnetic organic Janus cage with octyl group grafted onto interior surface; SEM image (c) of Janus porous nanosheets crushed from magnetic inorganic Janus cage and cross section TEM image (d) of slice of magnetic inorganic Janus cage after embedding in methyl methacrylate (MMA) and section在之前的工作中,即使Tween 80的含量提高近10倍,孔径的大小变化也不明显[22],相比之下,本文孔径对Tween 80的量变化更敏感。这是由于在之前工作中,由于无机/有机壳层是一锅法制备,因而在油相中加入了大量的聚合物单体,其和Tween 80相容性比烷烃溶剂要差,使Tween 80在界面的微相分区面积较小,即使浓度增加,对分区面积影响也不大,因而难以对孔径进行大范围调节,继续增加Tween 80的浓度只能破坏壳层。而本文先构建无机壳层,油相中只添加了硅前驱体,同时用烷基硅烷偶联剂代替带有活性双键的硅前驱体,使油相和Tween 80非极性部分的基团极性相近,使Tween 80微区可以在界面更加铺展,因而能够通过改变Tween 80的量来实现孔径的大范围调节。为了进一步验证,在不改变其他条件,仅仅不添加聚合物单体的情况下重复之前的制备过程,如图3所示,腔内不一步接枝聚合物时,制备的无机笼的孔径明显变大且孔径对Tween 80的含量更加敏感,但是失去聚合物的支撑,无机笼壳层本身支撑性差,呈塌缩状态。
图 3 (a) 水相中Tween 80添加量为0.22wt%制备的无机/有机复合Janus笼的SEM图像;(b) 水相中Tween 80添加量为0.04wt%制备的无机笼的SEM图像Figure 3. (a) SEM image of the polymer/inorganic composite Janus cages synthesized at 0.22wt% of Tween 80 in aqueous phase; (b) SEM image of inorganic Janus cages synthesized at 0.04wt% of Tween 80 without addition of monomer in aqueous phase2.2 磁性pH响应性聚合物/无机复合Janus笼的制备
研究发现,用带烷基的硅前驱体替代带活性双键的硅前驱体能够得到支撑性良好的无机笼,但是单纯的烷基链修饰内侧使得无机笼没有活性位点去接枝功能性的聚合物,限制了Janus笼的应用。考虑到自由基聚合难以控制,本工作基于“铜媒介”可控自由基聚合法(CuCRP)代替自由基聚合,在笼内侧接枝了pH响应性聚合物[26]。
为了在无机Janus笼内表面接枝聚合物,先要在内侧修饰上卤素基团。通过氨丙基三乙氧基硅烷和溴代异丁酰溴在等物质的量的条件下进行反应,制备出末端为溴基的硅烷偶联剂。对产物进行核磁共振(1H NMR,Bruker Avance III 400 HD,德国 Bruker)表征,各个H原子峰已在图4(a)中标注,其中,化学位移在6.96×10−6的峰对应着酰胺上与N相连的H,且积分结果为1 ,证明末端为溴基的硅烷偶联剂成功合成。再以摩尔比1∶1的比例将合成的末端Br基硅烷偶联剂和正辛基三乙氧基硅烷一起加入油相作为亲油一侧的修饰基团,得到内表面接枝Br基的Janus笼。如图4(b)所示,对Janus笼进行EDX元素分析,证明Br的成功引入。
图 4 (a) 合成的末端带Br基的硅烷偶联剂的核磁共振图谱;(b) 内表面接枝Br基的磁性无机Janus笼的SEM图像及内嵌EDX图谱(方框为元素分析所选区域)Figure 4. (a) 1H NMR spectrum of synthesized silane end with Br group; (b) SEM image and inset EDX spectrum of magnetic inorganic Janus cage with Br group grafted onto the interior surface (Box is the selected area for element analysis)成功在壳层内侧引入溴基以后,采用“铜媒介”可控自由基聚合法(CuCRP)制备pH响应性Janus笼[26],将磁性无机Janus笼分散在水相,pH响应性单体DEAEMA和配体分散在甲醇中,混溶后加入铜粉作为催化剂,壳层内侧的溴基引发聚合,接枝上pH响应性聚合物PDEAEMA,即得到pH响应的磁性聚合物/无机复合Janus笼。其反应体系温和简单,在水和甲醇混溶体系就可以聚合油溶性单体,更加清洁无污染,反应体系耐氧性高。在扫描电镜下观察,其形貌未有明显变化(图5(a))。将接枝功能聚合物的复合Janus笼用预聚物甲基丙烯酸甲酯(MMA)包埋,再进行切片并在TEM下观察,如图5(b)所示,发现Janus笼壳层内出现衬度较低的一层,说明PDEAEMA仅接枝在Janus笼的内表面(为了便于观察,包埋切片的Janus笼未复合磁性纳米颗粒)。将复合Janus笼超声破碎得到复合多孔片,发现内侧接枝聚合物之后变得粗糙(图5(c)),用HF刻蚀除去无机层,得到聚合物笼(图5(d))。
对复合Janus笼分别进行红外图谱(FTIR,Bruker EQUINOX 55,德国 Bruker)和热失重(TGA, Perkin-Elmer Pyris 1, 美 国 Perkin-Elmer)分析。其红外图谱如图6(a)所示,接枝聚合物后的Janus笼(曲线2)对比于无机磁性Janus笼(曲线1),在1725 cm−1出现新的特征峰,对应着聚合物PDEAEMA的酯基峰。此外,1050~1150 cm−1对应着二氧化硅Si—O—Si的非对称伸缩振动峰,1633 cm−1对应的为氨基的特征峰,595 cm−1对应着的Fe—O特征峰。通过TGA分析可测得复合Janus笼中聚合物的含量(图6(b))。图中曲线1为无机磁性Janus笼的热失重曲线,其残余63.1wt%,失重的原因主要为有机基团热解和硅前驱体进一步缩合造成。而曲线2为接枝聚合物后的复合Janus笼的曲线,其热解后残余36.8wt%,因而计算出复合Janus笼中聚合物质量含量为41.7wt%。
图 5 (a) 内表面接枝聚甲基丙烯酸二乙氨基乙酯(PDEAEMA)的磁性无机/有机复合Janus笼的SEM图像;(b) 未复合磁性纳米颗粒的内表面接枝PDEAEMA无机/有机复合Janus笼切片的TEM图像;(c) 复合Janus笼破碎后的多孔片的SEM图像;(d) 用HF酸刻蚀除去无机壳层后的有机笼的SEM图像Figure 5. (a) SEM image of magnetic composite Janus cage with polydiethylaminoethyl methacrylate (PDEAEMA) grafted onto interior surface; (b) Cross-section TEM image of composite Janus cage with PDEAEMA grafted onto interior surface (without Fe3O4 nanoparticles); (c) SEM image of Janus porous nanosheets crushed from composite Janus cage; (d) SEM image of organic cage obtained by etching inorganic shell with HF图 6 (a) 磁性无机Janus笼(曲线1)和磁性有机/无机复合Janus笼(曲线2)的FTIR图谱;(b) 磁性无机Janus笼(曲线1)和磁性有机/无机复合Janus笼(曲线2)的在空气中的热失重曲线Figure 6. (a) FTIR spectra of magnetic inorganic Janus cage ( curve 1) and magnetic composite Janus cage (curve 2); (b) Thermogravimetric analysis (TGA) curves in air of magnetic inorganic Janus cage (curve 1) and magnetic composite Janus cage (curve 2)2.3 磁性pH响应性聚合物/无机复合Janus笼用于油水分离、传输和响应性吸释
PDEAEMA为pH响应性聚合物,pKa约为7.2,当环境pH值大于其pKa时,PDEAEMA表现为疏水,反之则为亲水。Janus笼接枝pH响应性聚合物后,可以通过调节pH值来改变Janus笼内部的亲疏水环境,实现磁操控的pH响应性油水分离,进而可用于药物在体内的靶向释放等。
首先对复合Janus笼进行磁操控pH响应性吸释和磁分离实验,如图7所示。先将油溶性荧光染料dil-C18加入到少量甲苯中以便后续观察,将甲苯加入到分散有复合Janus笼的水中并调节水相pH值为5,两者不互溶形成界限分明的两相(图7(a))。再将水相pH值调至9,振荡吸附,甲苯和水相分层消失,体系呈浑浊的均相,再用磁铁进行磁分离,发现不再出现两相分层,而是甲苯都随着复合Janus笼被吸附在瓶壁上(图7(b))。将pH调回5,振荡后静置,再用磁铁进行磁分离,发现油水分相重新出现,当环境变为酸性时,油相重新被Janus笼释放出来(图7(c))。作为对照,保持水相pH值为5不变,重复上述实验,发现油相无法在酸性条件下被复合笼吸入(图7(d)、图7(e))。由此,复合Janus笼可对环境中的油进行pH响应性的吸释并可在磁操控下定向运输。
图 7 内表面接枝PDEAEMA的磁性复合Janus笼对油相的pH响应性及磁操控分离实验:(a) 分散有复合Janus笼的水(下层)和甲苯(上层)分相照片,甲苯中加入1, 1-双十八烷基-3, 3, 3, 3-四甲基吲哚羰花青高氯酸盐 (dil-C18)染料以便于观察,水相pH值为5;(b) 调节pH至9,振荡后磁分离吸收甲苯的复合Janus笼的照片;(c) 调节pH至5,振荡静置后磁铁吸附复合Janus笼的照片;(d) 分散有复合Janus笼的水(下层)和经dil-C18染色的甲苯(上层)分相照片,水相pH值为5;(e) 保持pH为5不变,振荡静置后磁铁吸附复合Janus笼的照片Figure 7. pH-responsive absorption and release of the oil and magnetic manipulation of magnetic composite Janus cage with PDEAEMA grafted onto interior surface: (a) Immiscible mixture of toluene (top)/aqueous dispersion of composite Janus cage (bottom), oil soluble dye 1, 1'-dioctadecyl-3, 3, 3', 3'-tetramethylindodicarbocyanine perchlorate (dil-C18) is added in toluene and the pH value of aqueous dispersion is 5; (b) pH value is modulated to 9 and oil contained magnetic Janus cages are collected by magnets after vibration; (c) pH value is modulated back to 5 and magnetic Janus cages are collected by magnets after vibration with the release of dyed oil; (d) Immiscible mixture of toluene (top)/aqueous dispersion of composite Janus cage (bottom), oil soluble dye dil-C18 is added in toluene and the pH value of aqueous dispersion is 5; (e) pH value remains to be 5 and magnetic Janus cages are collected by magnets after vibration while dyed oil remains unchanged进而在荧光显微镜下观察复合Janus笼对油相pH响应性的吸释过程,如图8所示。将甲苯加入香豆素-6荧光染料标记后再用十二烷基硫酸钠(SDS)为乳化剂和水乳化得到水包油乳液,乳液液滴在荧光显微镜下呈现蓝色。将pH响应性复合Janus笼先用FITC进行荧光标记,染料可吸附在Janus笼壳层便于后续观察。再将标记后的Janus笼加入上述荧光标记的水和甲苯的乳液中,分散均匀,调节pH为9左右,避光搅拌后再置于荧光显微镜下观察,发现蓝色的甲苯液滴(圆圈内)被吸入到Janus笼腔体内(图8(a)),磁分离Janus笼后取水相置于荧光显微镜下观察,蓝色液滴消失(图8(b)),证明在pH=9的条件下,Janus笼将甲苯完全吸入腔内;把pH调至5,壳层内聚合物由疏水转变为亲水,甲苯被挤出,此时在荧光显微镜下仅仅看到Janus笼呈现绿色的光圈,腔内蓝色液滴消失(图8(c)),磁分离后对水相取样观察,出现蓝色液滴(球形),证明甲苯被Janus笼响应性释放(图8(d)),说明复合Janus笼可通过改变环境pH值可以实现可控的油水分离。
图 8 pH=9时复合Janus笼吸附荧光染色甲苯的荧光显微镜图像(a)和用磁铁分离吸附甲苯的Janus笼后,上层水样的荧光显微镜图像(b); pH=5时Janus笼释放出甲苯后的荧光显微镜图像(c)和磁铁分离Janus笼后上层水样的荧光显微镜图像(d)Figure 8. Fluorescence microscopy images of the Janus composite cage after absorption of toluene with pH of the circumstance of 9 (a) and the supernatant water after magnetic collection of the Janus cage (b); Fluorescence microscopy images of the Janus composite cage after release of toluene with pH of the circumstance of 5 (c) and the supernatant water after magnetic collection of the Janus cage (d)3. 结 论
(1) 通过乳液界面溶胶凝胶和两种表面活性剂在界面微相分离先制备磁性无机Janus笼,内部修饰的烷基基团使无机笼壳层具有良好支撑性,同时可通过调节吐温80 (Tween 80)含量实现孔径在40 nm~1 μm可调,进一步利用同样修饰在内表面的卤素基团,通过“Cu媒介”的活性自由基聚合法在温和的反应条件下成功在内表面接枝pH响应性聚合物得到功能无机/有机复合Janus笼。
(2) 将复合Janus笼用于油水分离,证明了其可通过调控环境pH来实现对油相的响应性吸收和释放。这种pH敏感性的微容器且表面带有增强传质的孔道,有望用于药物的装载和体内靶向释放等领域。
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图 18 速度250 mm/s、功率1600 W时不同扫描次数时微槽形貌SEM图像对比[64]: (a) 扫描5次; (b) 扫描10次
Figure 18. SEM images comparison of micro groove morphology under different scanning times at the speed of 250 mm/s and power of 1600 W[64]: (a) Scanning for 5 times; (b) Scanning for 10 times
MEW—Matrix evaporation width; MRW—Matrix recession width; A, B—Thermal damage is more prominent in the region where the fibers are aligned perpendicular to the laser scanning direction
图 20 飞秒激光加工碳纤维增强复合材料的表面形貌图[72]: ((a)~(c)) 功率为1 W,
扫描次数分别为1、3、5次; ((d)~(f)) 功率为0.5 W, 扫描次数分别为1、3、5次 Figure 20. Surface morphology of carbon fiber reinforced composites processed by femtosecond laser[72]: ((a)-(c)) Number of
scanning is 1, 3, 5 times under 1 W power respectively; ((d)-(f)) Number of scanning is 1, 3, 5 times under 0.5 W power respectively -
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