激光透射扫描制备碳纤维增强树脂基复合材料
发布时间：2018-07-20 09:50
【摘要】：进入新世纪以来,新材料的开发及加工技术变得越来越重要。复合材料自问世以来,由于它优越的综合性能,已经广泛的应用于汽车工业、航天航空装备等方方面面的领域,成为评价国家和地区科技实力的重要的参考因素之一。激光加工技术作为新技术的代表,如果把其成功应用于复合材料的制备必将对复合材料的研发产生十分重要的影响。本文研究的主要内容包含以下两方面：(1)利用激光透射焊接制备碳纤维增强聚碳酸酯基复合材料是一种全新的制备方法,而且这种制备方法所需的设备在目前的市场上是没有的,所以需要通过自研开发,为了完成激光透射焊接制备碳纤维复合材料,本实验需要开发出满足制备要求的新型成套设备(2)激光透射塑料焊接中常用的吸收剂为碳颗粒,碳纤维的激光吸收特性与碳颗粒的激光吸收特性相同,由于碳纤维的比模量／比强度高等优良性质常常被应用于复合材料的制备,所以本实验以碳纤维布代替碳颗粒作为吸收剂,利用自研气流压紧激光扫描焊接成套设备,把碳纤维和热塑性树脂以气流压紧激光扫描加工的方法,制备碳纤维增强树脂基复合材料。激光透射扫描加工制备试样的过程,是碳纤维吸收激光并迅速将光转化为热,把浸在其上的聚碳酸酯(PC)预浸料和PC板重熔,使PC预浸料将碳纤维二维布填充,并且使PC板与预浸料联接为一个整体的过程,验证了激光透射扫描制备复合材料的可行性。(3)聚碳酸酯薄膜和碳纤维预浸布通过自研气流压紧激光扫描设备制备的复合材料碳纤维增强相含量低,抗拉强度差,层间集合强度也不够理想,为了进一步增加激光加工在复合材料制备过程中的可应用性,设计了把激光加工技术与手糊制备复合材料相结合的实验,采用先手糊成型后激光透射扫描处理的方法,结合了传统的手糊成型技术及激光透射扫描技术。通过不同树脂液浓度和加工方法的对比实验结果可以看出,在较高树脂浓度的制备条件中,手糊成型加激光扫描技术与手糊成型制备的试样抗弯强度值提高将近一倍。通过激光扫描后,已经固结在复合材料间的聚碳酸酯会重新熔化,并浸润到增强相纤维束内并填满各处空隙,这样不仅排出了基质内溶剂挥发留下的微小气孔,同时增加了树脂与碳纤维的结合强度,当碳纤维束与层间的聚碳酸酯含量足够,会明显提高复合材料的性能。
[Abstract]:Since entering the new century, the development and processing technology of new materials has become more and more important. Since its appearance, composite materials have been widely used in automotive industry, aerospace equipment and other fields, because of its superior comprehensive properties, and has become one of the important reference factors to evaluate the scientific and technological strength of countries and regions. Laser processing technology as a representative of new technology, if it is successfully used in the preparation of composite materials will have a very important impact on the research and development of composite materials. The main contents of this paper include the following two aspects: (1) Fabrication of carbon fiber reinforced polycarbonate matrix composites by laser transmission welding is a new preparation method. Moreover, the equipment required for this preparation method is not available in the current market, so we need to develop ourselves to prepare carbon fiber composites through laser transmission welding. This experiment needs to develop a new complete set of equipment to meet the requirements of preparation. (2) the commonly used absorbent in laser transmission plastic welding is carbon particles. The laser absorption characteristics of carbon fiber are the same as those of carbon particles. Because the excellent properties of carbon fiber such as high specific modulus / specific strength are often used in the preparation of composite materials, carbon fiber cloth is used as absorbent instead of carbon particles in this experiment, and a complete set of equipment for laser scanning welding by self-developed airflow compaction is used. Carbon fiber reinforced resin matrix composites were prepared by air compression laser scanning processing of carbon fiber and thermoplastic resin. The process of preparing sample by laser transmission scanning is that carbon fiber absorbs laser and converts light into heat quickly, remelting polycarbonate (PC) prepreg and PC board, making PC prepreg fill two dimensional carbon fiber cloth. And make the PC board and prepreg to be a whole process, The feasibility of preparing composite materials by laser transmission scanning was verified. (3) the carbon fiber reinforced phase and tensile strength of the composites prepared by self-developed air-compaction laser scanning equipment were low, and the tensile strength was poor. The interlaminar aggregate strength is not ideal. In order to further increase the applicability of laser processing in the preparation of composite materials, the experiment of combining laser processing technology with hand paste preparation of composite materials is designed. The method of laser transmission scanning after hand paste molding was adopted, and the traditional hand paste molding technology and laser transmission scanning technology were combined. By comparing the different resin concentration and processing methods, it can be seen that the bending strength of the samples prepared by hand paste molding plus laser scanning and hand paste molding is nearly doubled under the conditions of higher resin concentration. After laser scanning, the polycarbonate, which has been consolidated between the composites, will melt again, infiltrate into the reinforced fiber bundles and fill in the voids, thus not only expelling the tiny pores left by solvent volatilization in the matrix, At the same time, the bonding strength of the resin and carbon fiber is increased. When the content of polycarbonate between the carbon fiber bundle and the interlayer is sufficient, the properties of the composite will be improved obviously.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ327.3;TB332
本文编号：2133152
[Abstract]:Since entering the new century, the development and processing technology of new materials has become more and more important. Since its appearance, composite materials have been widely used in automotive industry, aerospace equipment and other fields, because of its superior comprehensive properties, and has become one of the important reference factors to evaluate the scientific and technological strength of countries and regions. Laser processing technology as a representative of new technology, if it is successfully used in the preparation of composite materials will have a very important impact on the research and development of composite materials. The main contents of this paper include the following two aspects: (1) Fabrication of carbon fiber reinforced polycarbonate matrix composites by laser transmission welding is a new preparation method. Moreover, the equipment required for this preparation method is not available in the current market, so we need to develop ourselves to prepare carbon fiber composites through laser transmission welding. This experiment needs to develop a new complete set of equipment to meet the requirements of preparation. (2) the commonly used absorbent in laser transmission plastic welding is carbon particles. The laser absorption characteristics of carbon fiber are the same as those of carbon particles. Because the excellent properties of carbon fiber such as high specific modulus / specific strength are often used in the preparation of composite materials, carbon fiber cloth is used as absorbent instead of carbon particles in this experiment, and a complete set of equipment for laser scanning welding by self-developed airflow compaction is used. Carbon fiber reinforced resin matrix composites were prepared by air compression laser scanning processing of carbon fiber and thermoplastic resin. The process of preparing sample by laser transmission scanning is that carbon fiber absorbs laser and converts light into heat quickly, remelting polycarbonate (PC) prepreg and PC board, making PC prepreg fill two dimensional carbon fiber cloth. And make the PC board and prepreg to be a whole process, The feasibility of preparing composite materials by laser transmission scanning was verified. (3) the carbon fiber reinforced phase and tensile strength of the composites prepared by self-developed air-compaction laser scanning equipment were low, and the tensile strength was poor. The interlaminar aggregate strength is not ideal. In order to further increase the applicability of laser processing in the preparation of composite materials, the experiment of combining laser processing technology with hand paste preparation of composite materials is designed. The method of laser transmission scanning after hand paste molding was adopted, and the traditional hand paste molding technology and laser transmission scanning technology were combined. By comparing the different resin concentration and processing methods, it can be seen that the bending strength of the samples prepared by hand paste molding plus laser scanning and hand paste molding is nearly doubled under the conditions of higher resin concentration. After laser scanning, the polycarbonate, which has been consolidated between the composites, will melt again, infiltrate into the reinforced fiber bundles and fill in the voids, thus not only expelling the tiny pores left by solvent volatilization in the matrix, At the same time, the bonding strength of the resin and carbon fiber is increased. When the content of polycarbonate between the carbon fiber bundle and the interlayer is sufficient, the properties of the composite will be improved obviously.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ327.3;TB332
【参考文献】
相关期刊论文 前3条
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3 孙金峰;陈杰;刘伟凌;朱伟平;吴永兴;;PAN原丝性能对碳纤维强度影响的探讨[J];高科技纤维与应用;2006年02期
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