CN113858612A - 一种基于fdm与等离子技术的碳纳米管复合材料成型方法 - Google Patents
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Abstract
基于熔融沉积(FDM)技术制备的产品自身力学性能较差,且层间弱界面结合使其存在先天不稳定性,限制了熔融沉积产品作为关键承载部件的使用范围。由于碳纳米管的强度和模量高、长径比高、比表面积大等特性,能通过阻止裂纹扩展、使裂纹偏转、界面脱粘、碳纳米管拔出和桥联等机制吸收能量,大大提高聚合物的韧性,是增韧聚合物的有效手段。为了提高熔融沉积产品的界面性能,扩大熔融沉积产品在现代工业中的使用范围,本发明的提供了一种基于FDM与等离子技术的复合材料成型方法。在熔融沉积成型过程中,利用等离子技术将碳纳米管喷涂于聚合物表面以提高层间界面的啮合摩擦力,增强界面粘结性能,从而提升基于FDM技术制备零件的整体力学性能,扩大熔融沉积产品在现代工业中的使用范围。
Description
技术领域
本专利涉及一种基于熔融沉积(FDM)与等离子技术的复合材料成型方法,特别涉及熔融沉积技术与等离子技术的碳纳米管复合材料成型技术,属于增材制造技术领域。
背景技术
近年来,随着熔融沉积技术成本的降低、工艺与材料的稳定性的提高,该技术被广泛的应用于医疗、交通运输、航天航空等领域,已成为当前热门的增材制造方式之一。但由于其自身材料的强度较低,整体成型的零件力学性能较差,且层间弱界面结合使其存在先天不稳定性,限制了熔融沉积产品作为关键承载部件的使用范围,并危及其在现代工业中的使用安全。等离子喷涂碳纳米管技术作为一种辅助材料界面改性的方式,近年来得到广泛的关注,由于其工艺较为复杂,技术成本较高,导致在目前的生产中并未得到广泛的应用。
基于FDM技术制备的产品自身力学性能较差,除了自身材料强度限制外,主要受该工艺本身限制。基于FDM技术的零件成型过程属于逐层固化累积的方式,在多工艺参数相对较优的情况下,零件的成型效果主要与材料相邻层间粘结情况有关。针对制备零件中出现的层间粘结效果差、孔隙率高等问题,本专利提出了在基体材料层间添加碳纳米管以提高界面粘结性能的制造工艺。作为世界上最强的材料之一,碳纳米管是由二维石墨烯片衍生而来的一种材料,具有相当大的长径比和稳定的碳-碳共价键,具有出色的力学性能和导电性。由于碳纳米管的强度和模量高、长径比高、比表面积大等特性,能通过阻止裂纹扩展、使裂纹偏转、界面脱粘、碳纳米管拔出和桥联等机制吸收能量,大大提高聚合物的韧性,是增韧聚合物的有效手段。通过等离子技术,能够有效实现碳纳米管的分散,使其均匀分布于聚合物表面。
为了提高熔融沉积产品的界面性能,扩大熔融沉积产品在现代工业中的使用范围,本发明的目的在于提供一种复合的3D打印技术,将熔融沉积技术与等离子喷涂技术结合,利用等离子技术喷涂碳纳米管来提高聚物层间界面的啮合摩擦力,增强界面粘结性能,从而提升基于FDM技术制备零件的力学性能。
发明内容
本发明提供了一种基于FDM与等离子技术的碳纳米管复合材料成型方法,将熔融沉积技术与等离子技术结合,综合两种技术的优点,实现提高熔融沉积产品层间粘结强度和整体力学性能的目标。
本发明的技术方案包括以下步骤:
步骤一:该打印机的加热系统包括加热块、喷头、散热管、散热风扇,原材料通过散热管进入加热块。
步骤二:加热块中配有热电偶进行加热,加热块表面的温度传感器对温度进行控制,热电偶加热至设定原材料熔融温度,温度传感器上传信号至外接控制器,控制步进电机进行原材料的输送。
步骤三:原材料输送至加热块中加热,原材料由固态变为熔融态,散热风扇持续吹风散热,防止原材料在散热管内提前熔融堵塞管道。同时碳纳米管和溶剂分别经相应管路进入等离子放电装置。
步骤四:熔融态高聚物经喷头挤出,按照预定轨迹进行打印沉积,固化在工作平台上;与此同时,控制器控制加热块两端的等离子放电装置按照相应打印方向分别工作,将碳纳米管均匀的喷涂至聚合物表面。
步骤五:待打印完最后一层时,控制器控制等离子放电装置停止放电,零件打印完成。
本发明的效果和益效是
(1)通过在熔融沉积零件层间添加碳纳米管提高界面摩擦力,加强层间界面粘结效果。
(2)提高零件整体承载能力,提高熔融沉积零件整体的机械性能,促进熔融沉积产品作为承载部件的使用范围。
附图说明
图1(a)与图1(b)是本发明基于FDM与等离子技术的碳纳米管复合材料成型方法的示意图。图中,1.打印平台,2.固化成型平面,3.喷头,4.等离子发散器,4-1.等离子发散器,5.加热块,6.连接架,6-1.连接架,6-2.后固定架,7.螺栓,8.散热风扇,9.原材料,10.气动接头,11.散热管,12.固定螺钉,12-1.连接固定螺钉,13.温度传感器,14.打印平台光轴,14-1.打印光轴,15.热电偶,16.碳纳米管接入口,16-1.碳纳米管接入口,17.溶剂接入口,17-1.溶剂接入口。
具体实施方式
下面结合附图和具体实施方式对本发明进行详细说明。
本发明为一种基于FDM与等离子技术的碳纳米管复合材料成型方法,该技术方法的示意图如图1所示,加热块5内部有温度传感器13和热电偶15,温度传感器13通过固定螺钉12固定于加热块5中。热电偶15通过过盈配合与加热块5进行固定。加热块5上方与散热管11连接,散热管11表面固定有散热风扇8。加热块5下方与喷头3连接,用于材料的挤出。加热块5两侧通过螺栓7固定连接架6、6-1,固定架6、6-1上固定有等离子放电装置,装置前端为等离子发散器4、4-1。碳纳米管通过碳纳米接入口16、16-1进入装置,溶剂通过溶剂接入口17、17-1进入装置。上述整体通过连接固定螺钉12-1与后固定架6-2连接,打印光轴14-1穿过后固定架6-2,通过外接步进电机实现X、Z方向上的运动。固化成型平面2放置于打印平台1上,在打印平台1下方有打印平台光轴14,该打印平台光轴14通过外接步进电机实现平台Y方向的运动。
工作时,首先热电偶15对加热块5进行加热,此过程通过温度传感器13进行检测,等温度升高至材料打印指定温度,外接送料电机将原材料9通过气动接头10进入散热管11。散热风扇8一直对散热管11进行吹风散热。原材料8进入加热块5后,受热成熔融态,通过喷头3挤出到固化成型平面2上。碳纳米管与溶剂分别通过碳纳米接入口16、16-1与溶剂接入口17、17-1进入等离子放电装置。当喷头3向左运动时,喷头3右边等离子发散器4-1进行喷涂;当喷头3向右方向运动时,喷头3左边等离子发散器4进行喷涂。待喷头3完成一层时,打印平台1下降一个层厚的高度继续重复上述打印过程,并由光轴14与光轴14-1分别实现X、Y方向的移动,直至整个零件打印完成。
Claims (2)
1.一种基于FDM与等离子技术的碳纳米管复合材料成型方法,其特征步骤如下:
步骤一:该打印机的加热系统包括加热块、喷头、散热管、散热风扇,原材料通过散热管进入加热块。
步骤二:加热块中配有热电偶进行加热,加热块表面的温度传感器对温度进行控制,热电偶加热至设定原材料熔融温度,温度传感器上传信号至外接控制器,控制步进电机进行原材料的输送。
步骤三:原材料输送至加热块中加热,原材料由固态变为熔融态,散热风扇持续吹风散热,防止原材料在散热管内提前熔融堵塞管道。同时碳纳米管和溶剂分别经相应管路进入等离子放电装置。
步骤四:熔融态高聚物经喷头挤出,按照预定轨迹进行打印沉积,固化在工作平台上;与此同时,控制器控制加热块两端的等离子放电装置按照相应打印方向分别工作,将碳纳米管均匀的喷涂至聚合物表面。
步骤五:待打印完最后一层时,控制器控制等离子放电装置停止放电,零件打印完成。
2.根据权利要求1所描述的一种基于FDM与等离子技术的碳纳米管复合材料成型方法,其特征在于:
(1)将两个等离子放电装置对称安装在加热块上,碳纳米管和溶剂分别经过对应的管道经等离子分散器放电,将碳纳米管均匀的喷涂至正在固化成型的材料表面,使聚合物材料表面均匀粘着碳纳米管。
(2)利用碳纳米管高强度、高模量、比表面积大等特性,能通过阻止裂纹扩展、界面脱粘等机制,大大提高熔融沉积产品层间界面粘结强度,从而提高FDM产品整体力学性能。
(3)等离子放电装置与熔融沉积喷头相连接,可实现在熔融沉积成型的同时,将碳纳米管均匀分散喷涂于聚合物表面,并利用聚合物处于玻璃化温度以上的短暂时间,使碳纳米管有效地嵌入聚合物内,使聚合物与碳纳米管充分粘结。
(4)该成型方法可应用的材料广泛,可用于多种热塑性树脂材料的层间粘结效果改善。
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