CN106145990B - 多层的碳碳复合物 - Google Patents
多层的碳碳复合物 Download PDFInfo
- Publication number
- CN106145990B CN106145990B CN201610312648.1A CN201610312648A CN106145990B CN 106145990 B CN106145990 B CN 106145990B CN 201610312648 A CN201610312648 A CN 201610312648A CN 106145990 B CN106145990 B CN 106145990B
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- carbon
- carbon fiber
- resin
- fiber layer
- layer
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- 239000002131 composite material Substances 0.000 title claims abstract description 57
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 155
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Images
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Abstract
在一些示例中,本公开描述了一种方法,包括通过经由三维打印系统的打印头在碳纤维层上沉积树脂或经由打印头在碳纤维层上施加CVD中的至少一种方式密实碳纤维层;以及在密实的碳纤维层上形成至少一个另外的密实的碳纤维层,其中形成至少一个另外的密实的碳纤维层包括:对于至少一个另外的层中的每个相应层,在密实的碳纤维层上添加另外的碳纤维层,以及通过在另外的碳纤维层上沉积树脂或在另外的碳纤维层上施加CVD中的至少一种方式密实另外的碳纤维层。在一些示例中,示例性方法可以用于形成密实的碳碳复合部件,诸如像密实的碳碳复合制动盘。
Description
技术领域
本公开涉及碳复合材料,例如用于制动摩擦材料中的碳碳复合材料。
背景技术
碳纤维加强碳材料(也称为碳碳复合材料)是包括在碳材料基体中加强的碳纤维的复合材料。碳碳复合部件可以用于许多高温应用中。例如,航天航空工业使用碳碳复合部件作为摩擦材料用于商业和军用飞机,诸如制动摩擦材料。
发明内容
描述了用于形成碳碳复合部件的设备、系统和技术,碳碳复合部件包括密实的碳纤维层。在一些示例中,本公开描述了一种用于形成密实的碳碳复合部件的方法,密实的碳碳复合部件由多个单独的密实的碳纤维层构成。密实的碳碳复合部件的单独的密实层可以在逐层的基础上形成,由于密实层中的每一个可以通过首先在之前形成的密实层上形成碳纤维层并接着例如在添加另一个碳纤维层之前使碳纤维层密实而形成。每个碳纤维层可以通过例如经由沉积树脂和/或施加化学气相沉积(CVD)的三维打印系统在添加的碳纤维层上沉积树脂和/或在添加的碳纤维层上施加CVD来密实。形成另外的单独的密实层的过程可以被重复直到碳碳复合部件具有希望的几何形状(例如厚度)并且密度通过多个单独的密实的碳纤维层生成。
在一些示例中,本公开指向一种方法,通过经由三维打印系统的打印头在碳纤维层上沉积树脂或通过打印头在碳纤维层上施加CVD中的至少一种方式密实碳纤维层;以及在密实的碳纤维层上形成至少一个另外的密实的碳纤维层,其中形成至少一个另外的密实的碳纤维层包括:对于至少一个另外的层中的每个相应的层,在密实的碳纤维层上添加另外的碳纤维层并且通过在另外的碳纤维层上沉积树脂或在另外的碳纤维层上施加CVD中的至少一种方式密实另外的碳纤维层。
在一些示例中,本公开指向一种碳碳复合材料,其包括多个密实的碳纤维层,多个密实的碳纤维层包括通过经由三维打印系统的打印头在第一碳纤维层上沉积树脂或经由打印头在第一碳纤维层上施加CVD中的至少一种方式而进行密实的密实的碳纤维的第一层,和沉积在密实的碳纤维的第一层上并且随后通过经由打印头在第二碳纤维层上沉积树脂或经由打印头在第二碳纤维层上施加CVD中的至少一种方式而在密实的碳纤维的第一层上进行密实的密实的碳纤维的第二层。
在一些示例中,本公开指向一种系统,其包括构造为相对于工作表面沉积CVD气体或沉积树脂中至少一种的打印头;以及控制器,构造为控制相对于工作表面沉积CVD气体或沉积树脂中的至少一种以形成多个密实的碳纤维层,其中多个密实的碳纤维层中的每一层通过经由打印头在碳纤维层上沉积树脂或经由打印头在碳纤维层上沉积CVD气体中的至少一种而形成。
一个或多个示例的细节在附图和下面的描述中进行阐述。本公开的其他特征、目的和优点从描述和附图以及根据权利要求是显而易见的。
附图说明
图1是示出示例性飞机制动组件的示意结构图。
图2是示出示例性添加制造系统的示意图,其可以用于制造示例性碳碳复合部件。
图3是示出根据本公开的各方面的通过在碳纤维层上施加化学气相沉积而形成碳碳复合部件的示例性技术的流程图。
图4是示出了根据本公开的各方面的通过在碳纤维层上沉积树脂而形成碳碳复合部件的示例性技术的流程图。
图5是示出了根据本公开的各方面的通过在碳纤维层上沉积树脂和施加化学气相沉积而形成碳碳复合部件的示例性技术的流程图。
图6是示出了示例性碳碳复合部件的概念图。
具体实施方式
本文描述了用于形成密实的碳碳复合部件的示例性技术。在一些示例中,密实的碳碳复合部件可以用作摩擦材料,例如作为飞机制动盘。在飞机制动垫片的情况下,在一些示例中,碳碳复合部件可以采用环形圈的形式,尽管还可以使用其他形状。
例如使用在航天航空应用(诸如制动垫片)中的密实的碳碳复合部件可以由碳纤维预制件形成,所述碳纤维预制件已使用多种密实技术进行密实。例如碳纤维预制件可以通过层叠由纺织或无纺碳纤维形成的织物薄片而形成,其可以随后通过化学气相浸透(CVI)或化学气相沉积(CVD)整体地进行密实而实现显示希望的最终密度的碳碳复合部件。但是这样的技术可能是缓慢的并且采取几种应用以达到希望的最终密度。附加地或替代地,预制件可以通过使用例如真空压力浸透(VPI)用液态树脂浸透整个预制件和/或跟随有树脂的碳化的树脂转移成型(RTM)进行密实。这些技术可能比CVI/CVD更快但是可能导致在整个碳碳复合部件上不均匀的密度梯度,这可能需要进一步的处理以获得希望的密度。
根据本公开的一个或多个示例,碳碳复合部件可以包括多个单独的密实的碳纤维层。密实的碳碳复合部件的单个密实层可以在逐层的基础上形成,由于密实的层中的每一个可以通过首先在之前形成的密实的层上形成碳纤维层,并接着例如在添加另一个碳纤维层之前密实碳纤维层。每个碳纤维层可以通过例如经由沉积树脂和/或施加化学气相沉积(CVD)的三维打印系统在添加的碳纤维层上沉积树脂和/或在添加的碳纤维层上施加CVD而密实。形成另外的单独的密实的层的过程可以被重复直到具有希望的厚度和密度的碳碳复合部件由多个单独的密实的碳纤维层制成。
本公开的示例可以提供一个或多个优点。例如,通过限制过多的碳纤维和碳基体材料而减少的材料的制造成本,以及通过一次密实单个的层而增加或设计的限定的产品的均匀性。如果以这样的方式设计,这可以赋予耐磨和止停性能以及阻止材料的氧化。
图1是可以包括根据本公开的技术形成的一个或多个碳碳复合部件的示例性组件10的概念图。为了易于描述,本公开的示例将主要关于由碳碳复合部件形成的飞机制动盘进行描述。但是本公开的技术可以用于形成除了飞机制动盘以外的碳碳复合部件。例如碳碳复合部件可以用作在其他类型的制动应用中的摩擦材料,以及用于诸如像热交换器和热屏障的其他应用中。
在图1的示例中,飞机制动组件10包括轮12、致动器组件14、制动叠层组件16和轴18。轮12包括轮毂20、轮外伸架凸缘22、胎圈密封胶24A和24B、长平头螺栓26和四方螺帽28。致动器组件14包括致动器壳体30、致动器壳体螺栓32和撞击件34。制动叠层组件16包括交替的转子盘36和定子盘38;转子盘36被构造成相对于定子盘38移动。转子盘36通过梁式键40安装至轮12,并且特别是安装至轮毂20。定子盘38通过花键44安装至轴18,并且特别地安装到扭矩管42。轮组件10可以支撑任何种类的私人、商业或军用飞机。
轮组件10包括轮12,轮12在图1的示例中通过轮毂20和轮外伸架凸缘22限定。轮外伸架凸缘22通过长平头螺栓26和四方螺帽28机械地固定至轮毂20。轮12限定胎圈密封胶24A和24B。在组装期间,可充气轮胎(未示出)可以放置在轮毂20之上并且由轮外伸架凸缘22固定在相对侧上。之后,四方螺帽28可以被紧固在长平头螺栓26上,并且可充气轮胎可与胎圈密封胶24A和24B一起膨胀,从而提供可充气轮胎的不透气的密封。
轮组件10可以通过扭矩管42和轴18安装在飞机上。在图1的示例中,扭矩管42通过多个螺栓16固定至轴18。扭矩管42支撑致动器组件14和定子38。轴18可以安装至起落架(未示出)的支柱上以将轮组件10连接至飞机。
在飞机的操作期间,制动可能是不时地必要的,诸如在着陆和滑行期间。轮组件10被构造成通过致动器组件14和制动叠层组件16提供对飞机的制动功能。致动器组件14包括致动器壳体30和撞击件34。致动器组件14可以包括不同种类的致动器,诸如像机电致动器、液压致动器、气动致动器或类似致动器中的一个或多个。在操作期间,撞击件34可以从致动器壳体30延伸离开以轴向地将制动叠层组件16压缩在压缩点48上以用于制动。
制动叠层组件16包括交替的转子盘36和定子盘38。转子盘36通过梁式键40安装至轮毂20以共同旋转。定子盘38通过花键44安装至扭矩管42。在图1的示例中,制动叠层组件16包括四个转子和五个定子。但是在其他示例中在制动叠层组件16中可以包括不同数量的转子和/或定子。而且,转子和定子的相对位置可以是相反的,例如,使得转子盘36安装至扭矩管42并且定子盘38安装至轮毂20。
转子盘36和定子盘38可以提供相对摩擦表面用于制动飞机。由于移动的飞机的动能转变成制动叠层组件16中的热能,所以制动叠层组件16中的温度可以快速升高例如超过200摄氏度。对于一些飞机,紧急制动(例如中断起飞)可以导致部件温度超过500摄氏度,并且在一些情况下甚至超过800摄氏度。这样,形成制动叠层组件16的转子盘36和定子盘38可以包括能够在这些温度下操作的坚固的热稳定的材料。
在一个示例中,转子盘36和/或定子盘38可以由根据本公开的一个或多个示例性技术(例如关于图2描述的技术)制造的碳碳复合材料形成。特别地,至少一个转子盘36和/或至少一个定子盘38可以由通过本公开的一个或多个示例性技术生产的碳碳复合部件形成。转子盘36和定子盘38可以由相同材料或不同材料形成。例如,轮组件10可以包括金属转子盘36和碳碳复合定子盘38,或反之亦然。而且,转子盘36中的每个盘和/或定子盘38中的每个盘可以由相同的材料形成,或者转子盘36和/或定子盘38中的至少一个盘可以由与转子盘36和/或定子盘38中的至少另一个盘不同的材料形成。
如简单提到的,在一些示例中,转子盘36和定子盘38可以分别通过梁式键40和花键44安装在轮组件10中。在一些示例中,梁式键40可以围绕轮毂20的内部在周向上间隔开。梁式键40可以例如成形成具有相对端部(例如矩形的相对侧)并且可以使一个端部机械地固定至轮毂20的内部并且使相对的端部机械地固定至轮毂20的外部。梁式键40可以与轮毂20整体地形成或可以与轮毂20分离并机械地固定至轮毂20,例如以提供转子盘36和轮毂20之间的热屏障。朝向那个端部,在不同的示例中,轮组件10可以包括热罩(未示出),热罩围绕制动叠层组件16径向并向外地延伸出例如以限制制动叠层组件16和轮12之间的热转移。
在一些示例中,花键44可以围绕扭矩管42的外部周向地间隔开。花键44可以例如与扭矩管42整体地形成,或可以与扭矩管42分离并机械地固定至扭矩管42。在一些示例中,花健44可以在扭矩管42内限定横向的凹槽。这样,定子盘38可以包括构造成能被插入花键内的多个径向向内设置的凹口。
因为梁式键40和花键44可以分别与转子盘36和定子盘38热接触,所以梁式键40和/或花键44可以由包括例如关于转子盘36和定子盘38的上述那些材料的热稳定材料制成。因此,在一些示例中,本公开的示例性技术可以用于形成用于轮组件10的梁式键和/或花键。
图1中示出的示例性组件10仅是一个示例。在其他示例中,组件10和组件10的部件(例如轮10、致动器组件14、制动叠层组件16和轴18)可以具有另外的适合构造。此外,在其他示例中,由示例性碳纤维预制件产生的本文描述的碳碳复合部件可以用于形成其他结构,除了(或替代地)盘36、38、键40和花键44中的一个或多个。
图6是示出根据本公开的各方面的示例性碳碳复合部件92的概念图。部件92可以是图1中的转子盘36和定子盘38的环形圈形式的示例。碳纤维部件92由密实的碳纤维材料94形成,并且包括多个单独的密实的碳纤维层(在图2中未示出)。如本文所述,密实的单独层可以顺序地形成在彼此上,其中单独层的组合限定材料94。但是,例如密实的材料94的相应层可以在单独的基础上进行密实,而不是将包括多个碳纤维层的纤维预制件整体地进行密实。例如,每个单独层可以通过以下过程形成,包括:形成碳纤维层,通过在碳纤维层上沉积树脂和/或在碳纤维层上施加CVD而使碳纤维层密实。一旦碳纤维层已被密实,另一个碳纤维层就可以形成在密实的碳纤维上,并且该新的碳纤维层也可以通过在碳纤维层上沉积树脂和/或施加CVD而进行密实。该过程可以重复直到层的组合形成显示希望的三维几何形状的密实的碳碳复合材料,诸如像材料94。如本文进一步描述的,可以经由三维打印系统执行通过在碳纤维层沉积树脂和/或在碳纤维层上施加CVD而进行的碳纤维层的密实。
图2是示出可以用于通过添加制造过程而形成密实的碳碳复合部件92的示例性三维打印系统50的示意图。但是,可以预期其他系统或用于形成密实的碳碳复合部件层的系统的组合。
如所示出的,系统60包括树脂进料器52,其输送用于密实碳纤维层的树脂材料至可移动的树脂打印头56。在一些示例中,树脂材料可以是树脂材料的预制小球或螺旋环的形式。树脂进料器52随后可以将树脂材料加热至熔化抗氧化剂材料的温度或以其他方式软化树脂材料(以允许加热的材料流出由可移动打印头68限定的一个或多个出口的方式)的温度。例如树脂打印头56可以包括限定一个或多个孔的金属印模,通过一个或多个孔在3D打印过程期间抗氧化剂材料被挤出(例如通过施加高压)。树脂打印头56的金属印模的一个或多个孔可以具有允许打印的树脂材料在例如通过挤压过程被挤出树脂打印头56时具有希望的截面的几何形状。
流出树脂打印头56的树脂材料可以被引向工作表面62,例如在沉积过程期间一个或多个碳纤维层可以被固定的地方。流出打印头56的树脂材料可以被引向相对的碳纤维层上的希望位置以使用沉积的树脂材料以希望的方式使碳纤维层密实。沉积的树脂材料可以允许冷却以形成嵌在沉积的树脂材料中的固态碳纤维层。树脂材料可以在打印过程期间经由树脂打印头56在连续或不连续的基础上进行沉积,并且树脂打印头56在三维空间中相对工作表面62上的碳纤维层的位置可以在连续或不连续的基础上进行调整。
如图2所示,系统50还包括CVD进料器54,其向可移动的气体沉积打印头58供应适合于碳纤维层的CVD的气体。来自CVD进料器54的气体流出由可移动气体沉积打印头68限定的一个或多个出口,并且可以被引向固定在工作表面62上的一个或多个碳纤维层。在一些示例中,用于CVD进料器54的气体可以被存储在压力箱中或通过用于大容量应用的常态气体输送方法(诸如通过公用系统)输送。用于CVD进料器54的气体可以被输送通过可移动气体沉积打印头68中的喷嘴,喷嘴可以如在产品设计期间规定的控制CVD气体的流量和方向。
此外,系统50还包括可移动的激光器60。激光器头60可能被构造成例如将通过树脂打印头56沉积在碳纤维层上的树脂加热至升高的温度。例如树脂可以通过激光器头60加热以包括例如在碳纤维层内的树脂的部分聚合/交联。在另一个示例中,激光器头60可以被构造成将树脂加热至足够高的温度以使得树脂经历碳化。在一些示例中,树脂可以使用相同的打印系统50沉积和碳化,并且可以在添加另一个碳纤维层之前进行。附加地或替代地,可以在基本上已形成所有密实的碳纤维材料层之后碳化树脂。例如在一些示例中,感应加热方法可以应用于具有沉积的树脂的层以将树脂转化成固化的或碳化的状态。例如,具有沉积的树脂的层可以形成在工作表面62上,其可以被加热至设计规定的和受控的温度。工作表面62的升高的温度随后可以使得树脂固化或转变成希望的状态。
在图2示出的示例中,系统50包括控制器64,其可以在经由树脂打印头56在碳纤维层上沉积树脂和/或经由气体沉积打印头58向碳纤维层施加气体的过程期间控制系统50的操作。例如,在密实过程期间,控制器64可以控制操纵臂66的移动。操纵臂66可以包括附接至可移动树脂打印头66、气体沉积打印头58和/或激光器60的一个或多个臂。例如,操纵臂可以包括分别附接至可移动树脂打印头66、气体沉积打印头58和激光器60的三个单独的操纵臂。在其他示例中,单独的操纵臂可以附接至可移动树脂打印头66、气体沉积打印头58和激光器60中的多个。通过移动操纵臂66,控制器64可以控制可移动树脂打印头66、气体沉积打印头58和激光器60相对于固定在工作表面66上的碳纤维层的位置。
可移动树脂打印头66、气体沉积打印头58和激光器60中的一个或多个在x、y和z方向的每个内可以是可移动的。以这种方式,控制器70可以控制可移动树脂打印头66、气体沉积打印头58和/或激光器60相对于工作表面62上的碳纤维层的位置,以使得通过树脂打印头56沉积的树脂、从气体沉积打印头58流出的气体和来自激光器60的激光聚焦以希望的方式使碳纤维层密实。附加地或替代地,在密实过程期间,控制器70可以通过移动工作表面66来控制树脂打印头66、气体沉积打印头58和/或激光器60相对于工作表面66的位置,而不是使工作表面66保持固定。在一些示例中,步进式电动机、伺服式电动机或其他适合的装置可以用于移动树脂打印头66、气体沉积打印头58和/或激光器60。控制器64可以分别调整流出树脂打印头66和气体沉积打印头58的树脂和气体的温度、压力和/或流速,以及调整激光器60的位置和强度以提供碳纤维层的希望的密实。此外,控制器64可以控制密实过程的一个或多个其他因素,诸如像流向和周围工作区域的环境状况。
在一些示例中,控制器64可以包括能够响应于接收到的和/或储存的数据而执行和/或输出命令信号的一个微处理器或多个微处理器。控制器64可以包括一个或多个处理器,包括一个或多个微处理器、数据信号处理器(DSP)、特定应用集成电路(ASIC)、现场可编程门阵列(FPGA)或任意其他等效的集成或分立的逻辑电路以及这些部件的任何组合。术语“处理器”或“处理电路”可以总体上指前述逻辑电路单独或与其他逻辑电路组合的任一个,或者任意其他等效电路。控制器64可以包括计算机可读存储器,诸如只读存储器(ROM)、随机存取存储器(RAM)和/或快闪存储器,或用于运行应用程序和处理数据以控制与系统50相关的操作的任何其他部件。因此,在一些示例中,控制器64可以包括存储作为一个或多个存储器、存储设备和/微处理器中的硬件、软件和/或固件的指令和/或数据。在一些示例中,控制器64可以使用在微控制器上运行的计算机辅助制造(CAM)软件包控制系统50。控制器64可以包括多个控制器或仅包括单个控制器。
虽然系统50包括用于向工作表面62上的树脂沉积和CVD施加的构造,但是根据本公开其他构造也可预期。例如,根据应用的技术,液态树脂和CVD气体可以使用相同或不同的打印头或相同或不同的打印系统而进行施加。在一些示例中,可以仅使用涉及沉积树脂的技术或仅使用涉及施加CVD的技术来形成密实的碳纤维层。在这些示例中,打印系统50可以被构造用于仅实现希望的密实技术。
在一些示例中,打印系统50可以被构造成在通过沉积树脂或施加CVD进行密实之前还形成碳纤维层。以此方式,密实的层可以通过首先经由三维打印系统50(在图2中未示出)上的打印头在工作表面62上沉积碳纤维材料而形成。碳纤维材料可以直接沉积在工作表面62上以例如形成第一碳纤维层或间接地沉积在工作表面62上,例如其中用于密实的沉积的碳纤维被形成在之前的密实的碳纤维层上。
替代地,在一些示例中,碳纤维层可以是预制的。例如碳纤维层可以是由纺织或无纺碳纤维形成的织物薄片的形式或包括碳纤维前体,诸如聚丙烯腈(PAN)或人造纤维丝,其可以通过碳化过程转变成碳纤维。在一些示例中,单个碳纤维层可以具有约0.125英寸的厚度。根据最终产品的意图应用,碳纤维层可以被切割成特定形状,包括例如具有希望的内直径和外直径(或用于附接目的的其他结构特征)的盘形制动器。单个碳纤维层可以具有约900g纤维每平方米至约1000g纤维每平方米的纤维体积密度。根据产品的设计规范纤维可以是连续的或分段的。在碳纤维层被添加至工作表面62后,层可以通过经由树脂打印头56沉积和/或经由打印头58施加CVD而被密实。
图3是示出了根据本公开的各方面的通过向碳纤维层施加CVD而形成碳碳复合物的示例性技术的流程图。为了易于说明,图3的示例被描述为通过图2的打印系统50来执行;但是可以预期适合用于执行添加制造以形成碳碳复合物的其他系统。
如所示出的,控制器64可以控制CVD气体进料器54和沉积打印头58的操作从而以密实碳纤维层的方式向单独的碳纤维层上和其周围施加含碳气体,单独的碳纤维层定位在工作表面62(70)。在整个过程中,控制器64可以通过操纵臂66控制打印头58的位置以使得基本上所有的或部分碳纤维层被密实。在一些示例中,气体的施加可以发生在其他热环境的炉中例如以促进化学气相沉积过程。
在层被密实后,另外的碳纤维层可以形成在之前形成的密实的层上(72)。新添加的碳纤维层如前所述地例如通过沉积与树脂结合的新添加的碳纤维层以将新添加的碳纤维层固定至密实的层而可以被预制并附接至密实的层。
在其他示例中,系统50可以包括碳复合材料进料器,以使得另外的碳纤维层可以经由三维打印系统50形成在密实的层上。通过利用三维打印系统50直接形成另外的碳纤维层(72),z轴纤维(例如从工作表面62垂直地延伸的纤维)可以形成为连接密实的碳纤维层,这可以提供预制件增加的强度,由此减小层剥离的机率。
在一些示例中,每个新添加的碳纤维层(72)可以基本上是平坦的,例如平坦的或几乎平坦的。在其他示例中,添加的碳纤维层(72)可以是非平坦的,例如带波纹或带波浪的碳纤维层。非平坦的碳纤维层可以提供对层剥离增加的抵抗力,特别是当另外的碳纤维层包括如上所述的预制薄片时。
在另外的碳纤维层形成(72)期间或之后,CVD进料器54可以被重新接合从而以密实另外的碳纤维层的方式将含碳气体施加至另外的碳纤维层上(74)。此外,控制器64可以在整个施加过程中控制打印头58在三维中的位置。根据密实的碳碳复合部件的意图用途,部件的最终密度可以包括约1.5g/cc至约2.0g/cc的密度。
整个过程可以被重复直到生成具有希望的厚度的多层的碳碳复合部件(76)。例如,要被用作飞机盘式制动器的碳碳复合部件可以包括具有约0.75英寸至约1.25英寸的总厚度的总共约15个至约30个之间的层。在一些示例中,向相对薄的碳纤维层施加CVD可以减少操作次数,例如与向完全形成的碳纤维预制件施加一个或多个周期的CVI/CVD相比。
在一些示例中,通过CVD施加含碳气体以密实碳纤维层(70)可以基本上发生在真空空间中(例如打印系统50被放置于在小于100脱下的容器中)或在惰性气体环境下从而控制化学沉积反应。在一些示例中,在施加CVD气体期间,环境可以被加热至升高的温度,例如约900摄氏度和1200摄氏度之间,以促进化学沉积反应。在密实期间,在将含碳通过打印头58沉积到碳纤维层上时,可能发生脱氢、冷凝和聚合反应的复杂组合以将碳原子沉积在碳纤维层内,随着时间的推移,这将会密实(增加密度)碳纤维层。在另一个示例中,打印头58在碳纤维层上沉积CVD气体的位置可以通过例如气体沉积打印头58中的加热元件和/或指向工作表面62上的施加地点的可选的可移动激光器60被加热至升高的温度。
在CVD施加期间可以使用任何适合的含碳气体,包括例如基于碳的气体,诸如天然气、甲烷、乙烷、丙烷、丁烷、丙烯或乙炔,或这些气体中至少两种的组合。美国专利申请公开号2006/0046059(Arico等人)提供了可以用于本文所述的技术的示例性CVD/CVI处理的概述,其全部公开内容通过引用并入本文。
如上所提到的,一旦碳纤维层通过施加CVD而被密实(70),过程可以通过向之前密实的层添加另外的碳纤维层并且向新添加的碳纤维层施加CVD和/或沉积树脂被被重复(76)。此过程可以被重复直到生成具有希望的三维几何形状、厚度和/或密度的碳碳复合部件,诸如像碳制动盘形式的部件。在一些示例中,碳碳复合部件可以被制造以使得其足够大以使其能在随后的时间被切割成多个装置,例如多个盘式制动器。如将在下面进一步描述的,在一些示例中,过程可以包括CVD和树脂密实的组合,例如使用CVD以密实一些单独的碳纤维层,同时使用树脂密实用于其他的单独的碳纤维层。附加地或替代地,CVD和树脂密实的组全可以用于密实相同的碳纤维层。
图4是示出根据本公开的各方面的涉及通过沉积树脂而密实碳纤维层的形成碳碳复合物的示例性技术的另一个流程图。类似地,为了易于描述,图4的示例描述为经由图2的系统50执行。
如所示出的,控制器64可以控制树脂进料器52和树脂打印头56从而以密实碳纤维层的方式经由打印头56将树脂沉积在工作表面62上的碳纤维层上(80)。树脂可以在环境条件下是液态形式或者树脂进料器52可以将树脂加热到其熔化点以上以利于将树脂沉积到工作表面62上。在整个过程中,控制器64可以控制打印头56的位置以及树脂的流量以使得基本上所有的或部分的碳纤维层以希望的方式被密实。一旦碳纤维层通过沉积的树脂被密实,另外的碳纤维层就可以形成在之前的密实的层上(82)。控制器64可以再次控制树脂进料器52和树脂打印头56以经由打印头56以密实新的另外的碳纤维层的方式将树脂沉积到新形成的碳纤维层上(84)。此过程可以被重复多次直到生成具有希望的三维厚度的多层碳碳复合部件(86)。在一些示例中,在逐层的基础上施加树脂可以允许树脂浸透碳纤维层而无需施加真空压力浸透(VPI)和/或树脂转移成型(RTM)。
如上所述,在一些示例中,一旦形成多层碳碳复合部件,则部件可以被加热以使得树脂经历碳化(88)。一旦被碳化,在一些示例中,碳碳复合部件则可以经历一个或多个CVI/CVD周期以增加部件的密度(例如超过那些通过单独树脂密实可达到的密度)(90)。
任何合适的树脂材料可以用于制作密实的碳纤维材料层,包括例如合成纤维、煤焦油、石油的各向同性和中间相沥青、酚醛树脂、环氧树脂等。在一些示例中,树脂可以是可碳化的树脂材料(例如沥青)以使得在碳化过程期间从树脂形成碳。
在一些示例中,树脂可以包括沥青,沥青是富碳氢化合物材料,其可以例如从煤、焦油以及石油中提取。在一些示例中,沥青还可以合成地生产。在另一个示例中,沥青可以来自于单个源(例如煤)或可以是来自不同源的不同沥青的组合。在一些示例中,沥青可以是中间相沥青。在其他示例中,沥青可以是各向同性沥青。也可预期在本公开范围内的中间相和各向同性沥青的组合。
如上所提到的,在一些示例中,树脂可以是在环境条件下以液态形式可使用的,而在其他示例中,树脂可以是在环境条件下固态的或半固态的并且可以通过加热转变为液态形式。在这样的情况下,树脂进料器52可以被构造用于在输送树脂通过打印头56之前熔化树脂(如果必要)。
在一些示例中,树脂的成分可以进行选择以显示在大约150摄氏度的熔点、在大约180摄氏度至大约270摄氏度之间的聚合/交联温度和/或在大约450摄氏度以上的碳化温度。
一旦树脂被沉积在碳纤维层上(80),在一些示例中,树脂则可以在添加另一个碳纤维层(82)之前被稳固或部分固化。在一些示例中,树脂可以在环境条件下被稳固或部分固化,而在其他示例中,树脂可以通过使用例如附接至打印系统50的可选的可移动激光器头60加热树脂而被稳固或部分固化。激光器头60可以被构造用于将树脂加热至升高的温度以在碳纤维层内导致例如树脂的部分聚合/交联。在另一个示例中,激光器头60可以被构造用于将树脂加热到足够高的温度以使得树脂经历碳化。在一些示例中,树脂可以使用相同的打印系统50沉积和碳化,并且可以在添加另一个碳纤维层之前进行。附加地或替代地,树脂可以在基本上所有的密实的碳纤维材料层已形成之后被碳化。
一旦通过沉积树脂密实层,则过程可以通过向之前的密实层添加另外的碳纤维层并且向另外的碳纤维层沉积更多的树脂和/或施加CVD而被重复。这个过程可以被重复直到生成具有希望的三维几何形状、厚度和/或密度的碳碳复合部件,诸如像碳制动盘。在一些示例中,碳碳复合部件可以被制造以使得其足够大并可以在随后的时间被切割成多个装置例如多个盘式制动器。
在一些示例中,在树脂已被沉积和碳化后,密实的碳碳复合部件层可以通过施加CVD/CVI以填充可能由于在树脂的交联和碳化过程气体散出而导致的部件中的气孔而进一步被密实。这个过程可以在逐层的基础上进行或可以在已基本上形成所有的密实的层之后进行。例如,打印系统50可以经由打印头56在碳纤维层上沉积树脂并且随后通过用激光器60加热而碳化树脂。在已进行树脂碳化之后,可以接合CVD进料器54以通过利用例如一种或多种之前所述的技术,经由气体沉积打印头58在新形成的密实的碳纤维层上沉积含碳气体,以获得例如在大约1.75克每立方厘米(g/cc)和大约1.90g/cc之间的希望的层密度。在向密实的层施加CVD之后,可以添加另外的碳纤维层并且过程可以被重复。
在另一个示例中,碳碳复合部件可以基本上通过上面公开的树脂沉积技术形成。随后,碳碳复合部件可以被碳化,随后施加一个或多个CVI/CVD周期以获得希望的密度。
在图5的流程图中示出了另一个示例性技术,其涉及通过沉积树脂和施加CVD而密实碳纤维层。以类似的方式,为了易于描述,图5的示例描述为经由系统50执行。
如图5所示,控制器64可以控制树脂进料器52和树脂打印头56以经由打印头56将树脂沉积在工作表面62上的碳纤维层上以密实碳纤维层(100)(例如类似于图4中的步骤80)。密实的碳纤维层随后可以例如通过使用经由控制器64和操纵臂66操作和控制的可移动激光器头60被加热以碳化树脂(102)。在树脂被碳化(102)之后,控制器64可以控制CVD气体进料器54和打印头58从而以将密实的层的密度例如增加至大约1.7克每立方厘米或更多的目标密度的方式将含碳气体沉积至密实的碳纤维层上(104)(例如类似于图3中的步骤70的内容)。
另外的碳纤维层可以随后使用例如上述技术形成在密实的层上(106)。控制器64可以控制树脂进料器52和树脂打印头56以将树脂沉积在新形成的碳纤维层上以形成另外的密实的碳纤维层(108)。新沉积的树脂可以随后被碳化(110),跟随的是随后的CVD施加(112)。过程步骤(108)至(112)可以被重复直到生成具有希望的三维厚度的多层碳碳复合部件(114)。
已描述了用于形成碳碳复合材料的不同技术的示例。在不同的示例中,本公开的技术可以在不同的硬件、软件、固件或其任意组合中实施。在一些示例中,本公开的技术可以在一个或多个处理器中实施,一个或多个处理器包括一个或多个微处理器、数字信号处理器(DSP)、特定应用集成电路(ASIC)、现场可编程门阵列(FPGA)或任意其他等效的集成或分立的逻辑电路以及这些部件的任何组合。在一些示例中,本公开的技术还可以包含或编码在包含指令的计算机可读介质中,诸如计算机可读存储介质。包含或编码在计算机可读存储介质中的指令可以使可编程处理器或其他处理器执行本方法,例如当指令被执行时。计算机可读存储介质可以包括随机存取存储器(RAM)、只读存储器(ROM)、可编程只读存储器(PROM)、可擦除可编程只读存储器(EPROM)、电子可擦除可编程只读存储器(EEPROM)、快闪存储器、硬盘、CD-ROM、软盘、 盒式磁带、磁性介质、光学介质或其他计算机可读介质。
已描述了各种示例。这些和其他示例在以下权利要求的范围内。
Claims (3)
1.一种用于形成碳碳复合部件的方法,包括:
经由三维打印系统的打印头在碳纤维层上施加含碳气体,以便经由化学气相沉积(CVD)密实所述碳纤维层;以及
在密实的碳纤维层上形成至少一个另外的密实的碳纤维层,其中形成至少一个另外的密实的碳纤维层包括,对于至少一个另外层中的每个相应层:
在密实的碳纤维层上添加另外的碳纤维层,以及
通过在另外的碳纤维层上沉积熔化的树脂或在另外的碳纤维层上使用化学气相沉积施加含碳气体中的至少一种方式密实另外的碳纤维层。
2.如权利要求1所述的方法,其中密实另外的碳纤维层包括:将熔化的树脂沉积在另外的碳纤维层上,所述方法进一步包括在另外的碳纤维层上沉积树脂之后经由三维打印系统的可移动激光器碳化所述熔化的树脂。
3.如权利要求1所述的方法,其中形成至少一个另外的密实的碳纤维层被重复直到形成至少15个密实的碳纤维层。
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