CN103201107A - 多层型蜂窝状金属玻璃结构 - Google Patents

多层型蜂窝状金属玻璃结构 Download PDF

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CN103201107A
CN103201107A CN2011800530267A CN201180053026A CN103201107A CN 103201107 A CN103201107 A CN 103201107A CN 2011800530267 A CN2011800530267 A CN 2011800530267A CN 201180053026 A CN201180053026 A CN 201180053026A CN 103201107 A CN103201107 A CN 103201107A
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glassy metal
grid
alveolate texture
plate
base alloy
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CN103201107B (zh
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M·D·黛米里乌
W·L·约翰逊
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California Institute of Technology CalTech
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Abstract

本发明公开了多层型蜂窝状金属玻璃结构及其制备方法。在一种实施例中,蜂窝状金属玻璃结构包括至少一个图形化的金属玻璃板片和至少一个附加板片。该至少一个图形化的金属玻璃板片可以包括连接在一起以形成板片组的多个板片,并且该结构可以包括夹在两个外板片之间的板片组。图形化的金属玻璃板片可以通过在金属玻璃板片上以热塑方式形成二维和/或三维图形而图形化。金属玻璃蜂窝状结构可用于各种各样的应用,包括但不限于冲击波防护应用、吸能应用、结构支撑应用、生物医学植入应用、热交换器应用、热管理应用、电屏蔽应用、磁屏蔽应用以及碎片和辐射屏蔽应用。

Description

多层型蜂窝状金属玻璃结构
技术领域
本发明涉及金属玻璃的多层型蜂窝状结构。
背景技术
蜂窝状晶体金属结构及它们的制造方法是已知的,并且已经用于各种应用中,包括撞击/冲击改进系统、散热介质及隔音应用。这些蜂窝状晶体金属结构通常包括铝板片(sheet)或其他金属板片,并且包括夹在未成形板片之间且焊接至未成形板片的波纹状金属板片,由此产生坚硬的低密度蜂窝状金属结构。蜂窝状结构吸收授予动能的能力直接取决于固体材料的比强度,即,屈服强度除以密度。因此,由低比强度固体(例如,在波纹状金属板片中使用的那些固体)制成的蜂窝状结构并不吸收大量的授予动能。此外,用来生产这些结构中的波纹状金属板片的材料展示出了有限的固态可成形性,使得波纹状板片难以生产。
发明内容
本发明涉及金属玻璃的多层型蜂窝状结构,该金属玻璃的多层型蜂窝状结构能够用于各种各样的应用中,例如,冲击波防护、撞击减缓、能量吸收、结构支撑、生物医学植入、热交换器、热管理、电屏蔽、磁屏蔽以及用于太空及外太空的碎片及辐射屏蔽应用。金属玻璃展示出可与常规的晶体金属比较的密度,但是具有远大得多的屈服强度。因此,金属玻璃在用于蜂窝状应用时提供无以伦比的比强度及能量吸收的提高。同样,与晶体金属不同,金属玻璃在加热至玻璃转变温度之上时展示出卓越的可成形性,并且在结晶之前冷却至室温时保留它们的机械性质。根据本发明的实施例,平面的非晶态金属被处理成用于蜂窝状结构构造的极低密度、高强度及可塑性变形的蜂窝状芯体。由于金属玻璃卓越的微复制能力,因而能够容易地形成需要严格容限的结构,例如,允许卡扣住组件的突出部。此外,还能够执行金属玻璃带条的微成形以制造具有展示出高韧性和延展性但抗弹性屈曲的微芯体的蜂窝状结构。
附图说明
本发明的上述及其他特征和优点通过在结合附图来考虑时参照下面的详细描述将会更好理解,在附图中:
图1是示出根据本发明的一种实施例的一种用于图形化金属玻璃板片的方法的示意图;
图2是示出根据本发明的一种实施例的一种用于拉伸金属玻璃板片的方法的示意图;
图3是示出根据本发明的一种实施例的一种用于使金属玻璃板片成波纹状的方法的示意图;
图4是示出根据本发明的一种实施例的金属玻璃板片组件的示意图;
图5是Co69Fe4Ni1Mo2B12Si12带条(ribbon)的照片,其中所嵌入的照片示出了由滚花工具在室温下生产的带条的塑性变形;
图6是在根据本发明的一种实施例的热塑性波纹成形之后的Co69Fe4Ni1Mo2B12Si12带条的照片,其中所嵌入的照片示出了包含波纹状带条的蜂窝状金属玻璃结构;
图7A是根据本发明的一种实施例的金属玻璃板片的透视图;
图7B是根据本发明的另一种实施例的金属玻璃板片的透视图;
图8是根据本发明的一种实施例的金属玻璃蜂窝状结构的透视图;
图9A是根据本发明的另一种实施例的金属玻璃蜂窝状结构的示意图;
图9B是根据本发明的另一种实施例的金属玻璃蜂窝状结构的透视图;
图10A是根据本发明的一种实施例的金属玻璃芯体的透视图;
图10B是根据本发明的另一种实施例的金属玻璃芯体的透视图;以及
图11A至11C是根据本发明的又一种实施例的金属玻璃蜂窝状结构的透视图。
具体实施方式
本发明涉及蜂窝状金属玻璃结构及其制备方法。在一种实施例中,金属玻璃结构至少包括第一及第二板片,其中第一及第二板片中的至少一个是金属玻璃板片。例如,根据一种实施例,结构包括至少一个夹在两个外部板片之间的金属玻璃板片。在另一种实施例中,该至少一个金属玻璃板片可以夹在两个外板片之间,并且该结构还可以包括至少一个中间板片。例如,至少一个金属玻璃板片的使用提供了密度低、强度高且具有良好塑性变形性的结构,所有这些性质会导致高的吸能能力,该至少一个金属玻璃板片被适当配置(例如,成波纹状或被塑形)以形成抗断裂且防屈曲的蜂窝状芯体。这些性质是类似构造的晶体金属板片结构所无法比拟的。
本领域技术人员应当意识到,蜂窝状结构是布置用于形成单位元胞的边或面的实心板或板片的组件或网络。(参见,例如,L.J.Gibson和M.F.Ashby的《Cellular Solids:Structure and Properties(蜂窝状固体:结构和特性)》(第2版,1997,剑桥大学出版社,英国剑桥)或者H.N.G.Wadley的“Multifunctional Periodic Cellular Metals(多功能周期性蜂窝状金属)”(Philosophical Transactions of the Royal Society A,Vol.206,pp.31-68,2006),在此以提及方式并入它们的公开内容)。本发明涉及蜂窝状结构,蜂窝状结构为了本发明的目的被限定为布置用于形成包含多个单位元胞的网格的金属玻璃板片的组件,每个元胞都具有比板片的厚度宽且与板片的宽度一样宽的面。图10示出了一种示例性的蜂窝状芯体(其中蜂窝状芯体是蜂窝状结构的单位元胞),以及图11示出了示例性的网格结构。
在一种实施例中,金属玻璃板片可以形成为金属玻璃芯体,该金属玻璃芯体能够是面内载荷型蜂窝状芯体(图10A)或面外载荷型蜂窝状芯体(图10B)。金属玻璃芯体能够被设计为通过确保芯体在动态载荷时由塑性屈服而不是由脆性断裂或弹性屈曲而失效来使所产生结构的吸能能力最大化。对于用于规避脆性断裂的芯体,金属玻璃板片的厚度应当在材料的“塑性区厚度”以下。“塑性区厚度”是材料于其下可抵抗住裂纹形成的厚度,并且与材料的断裂韧度和屈服强度之比的平方成比例。更具体地,为了这种实施例的目的,塑性区半径(rp)被定义为:
rp=Klc 2/πσy 2      (公式1)
其中,Klc是金属玻璃固体的I型断裂韧度,以及σy是金属玻璃固体的塑性屈服强度。如果金属玻璃板的厚度大于“塑性区厚度”(rp),则如果在弯曲或撞击时达到σy,金属玻璃板将会灾难性地断裂。
金属玻璃的塑性区厚度在从脆性合金变为韧性合金时通常从几微米变为数百微米。(在M.F.Ashby和A.L.Greer的“Metallic Glasses asStructural Materials(作为结构材料的金属玻璃)”(ScriptaMaterialia,Vol.54,pp.321-326,2006)中列出了若干种金属玻璃的“塑性区厚度”值,在此以提及方式并入其全文)。例如,非晶态Zr41.2Ti13.8Ni10Cu12.5Be22.5展示为rp~0.3mm,对应于σy=1800MPa和Klc=55Mpa.m1/2。相对比地,304不锈钢展示为σy=500MPa和Klc=150Mpa.m1/2,这导致rp~0.3mm,即,比金属玻璃的rp大两个数量级。相应地,由304不锈钢制成的1mm厚的平板在弯曲或撞击时将会展示出很高的抗断裂性。因此,尽管它们的强度很高,但是金属玻璃与传统材料(例如,钢铁)相比在抗断裂性方面处于相当大的劣势。然而,如果部件(例如,板片)的截面厚度小于rp,则能够抵抗断裂。为确保金属玻璃板片的抗脆性断裂性,板片厚度不应超过金属玻璃的“塑性区厚度”。因此,板片的厚度将取决于为板片形成而选用的金属玻璃。
能够考虑的另一个结构参数是芯体自身的几何形状。例如,在一种实施例中,芯体能够被配置以通过确保特性“芯体纵横比”(能够近似为载荷方向上的芯体高度除以板片厚度)优选为不超过芯体屈曲于其处成为可能的临界值来规避弹性屈曲。临界的“芯体纵横比”由材料的弹性应变极限以及芯体设计几何形状确定。金属极限的弹性应变极限约为0.02,该值远大于大部分晶体金属的弹性应变极限。因此,由于更高的弹性应变极限,金属玻璃芯体一般应当具有比相同设计几何形状的晶体金属芯体低的纵横比,以便避免弹性屈曲。
不同的芯体设计几何形状用以为芯体屈曲确定标准的方式在H.N.G.Wadley、N.A.Fleck和A.G.Evans的“Fabrication and StructuralPerformance of Periodic Cellular Metal Sandwich Structures(周期性蜂窝状金属夹层结构的制造和结构性能)”(Composite Science andTechnology,Vol.63,pp.2331-2343,2003)中进行了讨论,在此全文引用该文献,以作参考。为确保芯体能够抵抗弹性屈曲,“芯体纵横比”不应超过与芯体屈曲关联的临界值。因此,板片的“芯体纵横比”将取决于所选的芯体设计几何形状以及所施加载荷的方向。因此,当选用厚度小的板片时,蜂窝状芯体优选被制作成高度同样小的,以便使“芯体纵横比”保持于与芯体屈曲关联的临界值以下。当以微小的“塑性区厚度”为特征的脆性金属玻璃被选用时能够产生这样一种情形。在该情形中,需要微小的板片厚度来规避脆性断裂,并且因此,需要微小的芯体高度来规避弹性屈曲。在这样的情形中,微板片的微波纹能够有助于制作抗断裂且抗屈曲的微芯体。
假定蜂窝状结构的几何形状符合上述用于回避断裂和屈曲两者的标准,则该结构将被预期因塑性屈曲而失效。在塑性崩塌之下的失效应力将高于在结构因屈曲或断裂而失效时已经发生的失效应力。
该结构的金属玻璃板片可以由任意适合的金属玻璃合金制成。适合的金属玻璃合金的非限制性实例包括Fe基合金、Co基合金、Mg基合金、Al基合金、Zr基合金、Au基合金、Pt基合金、Ni基合金、Cu基、Ti基、Pd基合金及稀土基合金。具体地,适合的Fe基合金的一个非限制性实例是Fe80C8P12,适合的Co基合金的一个非限制性实例是Co69Fe4Ni1Mo2B12Si12,适合的Mg基合金的一个非限制性实例是Mg65Gd10Cu25,适合的Al基合金的一个非限制性实例是Al85Ni6Fe3Gd6,适合的Zr基合金的一个非限制性实例是Zr57Nb5Cu15Ni13Al10,适合的Au基合金的一个非限制性实例是Au49Ag5.5Pd2.3Cu26.9Si16.3,适合的Pt基合金的一个非限制性实例是Pt57.5Ni5.3Cu14.7P22.5,适合的Ni基合金的一个非限制性实例是Ni60Nb35Sn5,适合的Pb基合金的一个非限制性实例是Pd77.5Cu6Si7.5,以及适合的稀土基合金的一个非限制性实例是La55Al25Ni20
除了该至少一个波纹状金属玻璃板片外,根据本发明的实施例的结构还包括至少一个附加板片,例如,外板片或中间板片。该附加板片的材料可以是任意适合的材料。该板片的合适材料的非限制性实例包括聚合物、环氧树脂、玻璃、木材、陶瓷、金属(例如,高强度板片金属)、金属玻璃(例如,以上所述的那些)及它们的合成物。此外,在一种实施例中,附加的板片可以由与金属玻璃板片相同的材料制成。在包括多个附加板片的实施例中,这些附加板片可以由相同的材料制成或者可以由不同的材料制成。
所述结构的该至少一个金属玻璃板片同样优选地应当具有在材料的“塑性区厚度”以下的厚度,并且被图形化以产生二维和/或三维网格配置。如上文所指出的,板片能够被形成为具有在与芯体屈曲关联的临界值以下的“芯体纵横比”的蜂窝状芯体。例如,在一种实施例中,金属玻璃板片12包括二维结构,例如板片上的狭缝或小开口13,如图7A所示。虽然被示为切入金属玻璃板片的狭缝或开口,但是二维图形可以是任意合适图形。例如,如图5所示,作为板片上的狭缝或开口的替换,二维图形可以是板片表面上的压印。图5示出了在室温下经受过以滚花工具进行的塑性变形的金属玻璃板片。
在另一种示例性的实施例中,金属玻璃板片12包括三维图形,例如,波纹图形15,如图6所示。虽然三维图形被示为一般的正弦波图形,但是任意适合的三维图形都可以使用。例如,除一般的正弦波形状外,三维图形可以是锯齿形(zig-zag)或类似的形状。
在又一种实施例中,金属玻璃板片12包括二维及三维结构。例如,板片可以包括狭缝或开口13和波纹图形15两者,如图7B所示。
该至少一个附加板片同样可以被图形化以在板片内产生二维和/或三维结构。以上针对金属玻璃板片所讨论的二维及三维图形对于该至少一个附加板片同样有用。
根据本发明的一种实施例,如图8所示,金属玻璃结构10包括至少一个夹在两个外板片14之间的图形化金属玻璃板片12。在一种实施例中,如图9A所示,该至少一个金属玻璃板片包括相互堆叠或者结合以形成金属玻璃板片组12a的至少两个金属玻璃板片12。该金属玻璃板片组12a可以夹在两个外板片14之间,以完成金属玻璃结构10a,如图9A所示。作为选择,金属玻璃板片组12a可以由一个或多个中间板片16分隔以形成多层式金属玻璃结构10b,如图9B所示。
在本发明的另一种实施例中,制造金属玻璃结构的方法包括:首先通过将平面金属玻璃板片加热至有助于热塑性成形的温度来制作图形化的金属玻璃板片。该温度可以是在构成平面金属玻璃板片的材料的玻璃转变温度(Tg)与结晶温度(Tx)之间的任何温度。然后,施加适当的压力以便在板片上产生所期望的二维和/或三维图形。在一种实施例中,压力可以为大约1-10,000MPa。在形成图形之后,使金属玻璃板片在结晶之前冷却。
图1至3示出了根据本发明的一种实施例的一种制备图形化的金属玻璃板片的示例性方法。如图1所示,首先通过以切割工具170(例如,激光器)在板片上制作狭缝130在平面金属玻璃上形成二维图形,以形成二维图形化的金属玻璃板片120a。然后以适合的工具(例如,激光器)按尺寸修整二维图形化的金属玻璃板片120a。然后,如图2所示,二维图形化的板片120a被加热至有助于热塑性成形的温度,并且拉伸或者扩展至所期望的长度。取决于施加于板片上的二维图形,拉伸或扩展可以创建开放元胞系统、封闭元胞系统或者具有取决于二维图形的表面纹理的压印表面。二维图形化的金属玻璃板片120a然后被加热至有助于热塑性成形的温度,并且进行三维图形化以形成三维图形化的金属玻璃板片120b,如图3所示。
金属玻璃板片可以通过任意适合的方法来进行三维图形化。此类适合的方法的非限制性实例包括吹塑成型、注塑成型、熔模铸型(investment molding)、超塑性成形、热锻造、爆炸冲击成形、拉伸、弯曲和折叠。
在一种示例性的实施例中,如图3所示,通过将金属玻璃板片在两个辊筒200a和200b之间穿过来对其进行三维图形化。辊筒200a和200b一般为圆柱形,并且在其长及圆周上分别具有齿210a和210b。第一辊筒200a的齿210a与第二辊筒200b的齿210b啮合。二维图形化的金属玻璃板片120a在第一辊筒200a的齿210a与第二辊筒200b的齿210b之间穿过。在穿过辊筒200a和200b的齿210a和210b之间时,由辊筒200a和200b的齿210a和210b施加于板片120a上的压力对二维图形化的金属玻璃板片120a进行三维图形化。虽然以上方法结合进行二维和三维两种图形化的板片来描述和说明,但是应当理解,该方法可以被修改以产生仅进行二维图形化或者仅进行三维图形化的板片。例如,要制作仅进行二维图形化的板片,可以省略加热板片的第二步骤以及使板片穿过辊筒的步骤。同样,要制作仅进行三维图形化的板片,可以省略在板片上切割狭缝以及展开板片的步骤。
辊筒200a和200b的齿210a和210b可以采用任意适合的形状。例如,如图3所示,齿的形状一般可以是梯形的,以形成具有包括形状一般为梯形的峰和谷的三维图形的板片。作为选择,齿的形状可以是大致圆形或半圆形、大致卵形或半卵形、大致方形、大致矩形或大致三角形。但是,齿并不限于这些形状,而是可以采用适合于在板片上造成所期望的三维图形的任何形状。
在本发明的一种实施例中,如图3所示,三维图形化的金属玻璃板片包括用作卡扣配合的紧固件或定位器的定位销的小突出部220。当从金属玻璃板片的一侧观看时,突出部220确实是从板片的表面向外延伸出的凸起。但是,当从板片的另一侧观看时,突出部220是在板片的表面上的凹入部。这些突出部220使金属玻璃板片能够彼此快速且稳固地附接,以形成用于构造金属玻璃结构的金属玻璃板片组。要在金属玻璃板片上形成这些突出部220,辊筒200a包括在齿210a之间的空间内的突出部230a,并且齿210a包括突出部230b。同样,辊筒200b包括在齿210b之间的空间内的凹入部240a,并且齿210b包括凹入部240b。在旋转辊筒200a和200b时,在辊筒200a上的突出部230a与在辊筒200b的齿210b上的凹入部240b啮合,而在齿210a上的突出部230b与在辊筒200b上的凹入部240a啮合。当金属板片穿过辊筒200a和200b时,突出部230a和230b迫使金属玻璃板片的一部分进入凹入部240b和240a,由此在金属玻璃板片的峰和谷内形成小突出部220。
具有二维和/或三维图形的金属玻璃板片可以在过冷液态中热塑成形,如图6所示,图6示出了热塑成波纹状的Co69Fe4Ni1Mo2B12Si12带条。这些带条能够被用来制作具有约为0.17g/cc的蜂窝密度的蜂窝状结构(如图6内的嵌入图所示),该0.17g/cc的蜂窝密度对应于98%的孔隙率。
金属玻璃结构可以按照任意适合的方式来组装。如上文所指出的,这些结构可以包括夹在两个外板片之间的一个或多个图形化的金属玻璃板片,或者可以包括由中间层分隔且夹在两个外板片之间的图形化金属玻璃板片组。在包括多个图形化金属玻璃板片的实施例中,板片可以通过任意适合的方式来堆叠或者来连接或结合。这些适合方法的非限制性实例包括焊接、点焊、激光焊、电子束焊、钎焊、使用粘合剂、使用卡扣配合、扩散粘接、瞬态熔融、在过冷液相区内的热塑性粘接、以及经由中间低玻璃转变温度合金的粘接。
在金属玻璃板片包括卡扣配合突出部的实施例中(如图3所示),金属玻璃板片能够经由卡扣配合突出部220连接。图4示出了连接包括突出部220的金属玻璃板片的一种方法。如图所示,每个金属玻璃板片都包括在峰部上的突出部220a以及在谷部上的突出部220b。在连接两个板片时,在上板片的峰部上的突出部220a与在下板片的谷部上的突出部220b对准。突出部220b被卡扣配合到突出部220a的凹入部内,以连接上下板片。任意数量的金属玻璃板片都可以按照这种方式来连接,以形成金属玻璃板片组,例如,图4所示的金属玻璃板片组。
在连接所期望数量的图形化金属玻璃板片后,所产生的图形化金属玻璃板片组可以夹在两个外板片之间,或者可以由中间板片分隔,以形成多层式结构,这些多层式结构然后可以夹在两个外板片之间。图形化的金属玻璃板片可以通过任意适合的方式与外板片或中间板片连接。这些适合方法的非限制性实例包括焊接、点焊、激光焊、电子束焊、钎焊、使用粘合剂、使用卡扣配合、扩散粘接、瞬态熔融、在过冷液相区内的热塑性粘接、以及经由中间低玻璃转变温度合金的粘接。
要使用包括卡扣配合突出部的图形化金属玻璃板片来制作金属玻璃结构,在金属玻璃板片组中最上层金属玻璃板片可以省略在峰部上的突出部220a。板片仍包括在谷部内的突出部220b以便于与下板片连接,但是可以省略在峰部上的突出部220a以改进最上层板片与结构的外板片的连接。要制作在谷部具有突出部220b但排除峰部上的突出部的最上层图形化金属玻璃板片,辊筒200a和200b可以进行相应修改。例如,辊筒200a包括在齿210a之间的空间内的突出部230a,但是齿210a不包括任何突出部。同样,辊筒200b不包括在齿210b之间的空间内的凹入部,但是齿210b包括突出部240b。在旋转辊筒200a和200b时,在辊筒200a上的突出部230a与在辊筒200b的齿210b上的凹入部240b啮合。当金属板片穿过辊筒200a和200b时,突出部230a迫使金属玻璃板片的一部分进入凹入部240b,由此仅在金属玻璃板片的谷部内形成小突出部220。
根据本发明的多层式蜂窝状金属玻璃结构可以用于任意适合的应用中。这些适合应用的非限制性实例包括消费电子外壳和框架、冲击波防护应用、吸能应用、结构支撑应用、生物医学植入、热交换器应用、热管理应用、电屏蔽应用、磁屏蔽应用以及用于太空和外太空的碎片和辐射屏蔽应用。
示例性实施例
在一种示例性的实施例中,多层式蜂窝状金属玻璃结构涉及用于消费电子设备的框架和外壳。由于它们很高的强度和低模量,金属玻璃具有很高的抗划性和弹性,还有良好的耐腐蚀性,并且因此被认为是用于消费电子设备的框架的有吸引力的材料。例如,非晶态Zr41.2Ti13.8Ni10Cu12.5Be22.5展示出了1800MPa的屈服强度,该1800MPa的屈服强度几乎为304不锈钢的屈服强度的4倍。实际上,人们相信这样高的强度更加适合于电子框架应用。但是,尽管有这些引人注意的性质,金属玻璃一般展示出对缺陷极其敏感的低断裂韧度,并且因此,金属玻璃框架在弯曲或撞击时往往易于脆性断裂。
具体地,如果金属玻璃板的厚度大于rp,则如果在弯曲或撞击时达到σy,该金属玻璃板将会灾难性地断裂。金属玻璃的rp通常在脆性合金变为韧性合金时从几微米变为数百微米。例如,非晶态Zr41.2Ti13.8Ni10Cu12.5Be22.5展示为rp~0.3mm,对应于σy=1800MPa和Klc=55Mpa.m1/2。相对比地,304不锈钢展示为σy=500MPa和Klc=150Mpa.m1/2,这导致rp~0.3mm,即,比金属玻璃的rp大两个数量级。相应地,由304不锈钢制成的1mm厚的平板在弯曲或撞击时将会展示出很高的抗断裂性。因此,尽管它们的强度很高,但是金属玻璃与传统材料(例如,钢铁)相比在抗断裂性方面处于相当大的劣势。该缺点可能通过以下方式来克服:制作厚度小于rp的金属玻璃板,使得它们能够抵抗断裂。但是,制作超薄金属玻璃板遇到了相当大的加工挑战,因为模塑细长通道内的粘性金属玻璃液体所需的压力能够是极高的。
在消费电子外壳的实施例中,蜂窝状架构,例如,图11A至11C所示出的那些结构(1000)(参见H.N.G.Wadley的“MultifunctionalPeriodic Cellular Metals(多功能周期性蜂窝状金属)”(PhilosophicalTransactions of the Royal Society A,Vol.206,pp.31-68,2006),在此以提及该文献方式并入全文),有人提议至少部分以金属玻璃来制作并且用作消费电子设备的框架,假定这些结构被设计用于在没有显著折损强度的情况下提供足够的韧度。具体地,如上所述,这些结构由经图形化和/或按两个平板片(1014)之间的网格(1012)配置来布置的一个或多个金属玻璃板片(1010)构成。在该实施例中,至少网格层由金属玻璃形成,而尤其重要的是,金属玻璃板片被设计为具有比有公式1确定的金属玻璃的“塑性区厚度”(rp)小的厚度,并且网格被设计为展示出至少为金属玻璃固体的塑性塌陷强度的50%的塑性塌陷强度。
在一种示例性的实施例中,考虑具有由Zr41.2Ti13.8Ni10Cu12.5Be22.5(σy=1800MPa)制成的六边形网格(如图11A所示意性示出)的蜂巢状面板。该面板具有高度h=0.6mm,并且支撑物具有厚度t=0.15mm。由于整个结构内的金属玻璃的厚度都在rp以下,因而能够预期该结构会在撞击或弯曲时充分抵抗住断裂以及因塑性屈服而失效。
在该塑性屈服破坏下,具有面外载荷的六边形蜂巢状网格的示例性蜂窝状结构的塑性塌陷应力σ能够按以下公式计算(参见,例如,L.J.Gibson和M.F.Ashby的《Cellular Solids:Structure and Properties(蜂窝状固体:结构和特性)》(第2版,1997,剑桥大学出版社,英国剑桥,pp.155-157),在此以提及该文献方式并入全文):
σ=5.6σy(t/l)5/3   (公式2)
其中σy是材料的塑性屈服强度,t是板片的厚度,而l是元胞面的宽度。以t=0.15mm、l=0.6mm及σy=1800MPa代入,可得σ=1000MPa。因此,该结构将展示出比金属玻璃塑性屈服强度的50%还大的塑性塌陷强度(并且为304不锈钢的强度的两倍),同时能够抵抗弯曲或撞击所致的断裂。
有趣的是,蜂窝状面板还会具有比相同厚度的整体型板低得多的密度,这是在消费电子应用中所高度期望的。对于具有六边形蜂巢状网格的示例性蜂窝状结构,该结构的密度ρ与整体型固体的密度ρs之比能够按以下公式计算(参见,例如,L.J.Gibson和M.F.Ashby的《Cellular Solids:Structure and Properties(蜂窝状固体:结构和特性)》(第2版,1997,剑桥大学出版社,英国剑桥,pp.42),在此以提及该文献方式并入全文):
ρ/ρs≈(2/√3)(t/l)     (公式3)
以t=0.15mm、l=0.6mm代入,可得ρ/ρs=0.3,也就是,该架构的蜂窝状面板的密度将比相同厚度的整体型板的密度小70%。
由于示例性网格的塌陷强度为金属玻璃屈服强度的56%,但密度仅为金属玻璃的密度的30%,因而网格的比强度比金属玻璃的比强度大85%,其中比强度被定义为强度比密度。
任意网格结构的塑性塌陷强度(σ)都能够更一般地表示为σ=Aσy(t/l)n,其中σy是金属玻璃的塑性屈服强度,t是板片的厚度,l是元胞面的宽度,以及其中A为4-7,更优选地约为6,并且n为1-3,更优选地约为2。
同样,任何网格的密度(ρ)都能够更一般地表示为ρ=Bρs(t/l)确定,其中ρs是金属玻璃的密度,t是板片的厚度,l是元胞面的宽度,以及B为1-3,优选地约为2。
而且,如上所述,制作t=0.15mm、h=0.6mm的六边形金属玻璃蜂巢状面板将会显著比制作t=0.15mm的整体型金属玻璃板容易。这是因为:与模制长0.15mm的金属玻璃板相反,该面板能够通过图形化0.6mm的金属玻璃板来制作。具体地,能够将金属玻璃板加热至玻璃转变温度以上,进入过冷液相区,并且对着立式六边形的模具网格挤压,使得复制(或微复制)模具网格。加热金属玻璃板的方法包括(但不限于)炉加热、感应加热(例如,使用射频线圈)或欧姆加热(例如,使用如美国专利申请2009/0236017中公开的电阻器,在此以提及该专利申请方式并入全文)。模具网格的材料包括(但不限于)铜、青铜、铝、钢、硅、可加工的陶瓷、蓝宝石。
图11A至11C示出了可能的网格架构的实例。虽然图中示出了若干种实施例,但是应当理解,任意适合的蜂窝状结构都可用于本发明,包括,例如,蜂窝、棱柱、桁架(trusses)、织物及泡沫结构。
进而,这些蜂窝状结构可以并入任意适合的电子框架或外壳,包括,例如:
●外壳或框架,包括具有用于界定至少一个隔间(enclosure)的壁的主体(body),其中隔间被设计为至少部分包住至少一个电子构件;
●框架,还包括至少一个开口;
●框架,具有被设计为允许达到该至少一个电子构件的开口;
●框架,包括至少两个单独部件;
●框架,其单独部件被固定地或可移动地附接;
●框架,其单独部件由选自粘合剂、螺钉和卡扣连接器中的一个连接器接合在一起;
●框架,具有至少一个还涂有选自TiN、SiC及钻石的高硬化材料的部分;
●框架,具有至少一个被阳极氧化的部分;
●框架,具有至少一个被阳极氧化以提供彩虹颜色的部分;
●框架,采取用于选自移动电话、PDA、便携式计算机及数码相机的设备的外壳的形式;以及
●框架,用于为电子构件提供至少部分电子干扰保护。
虽然本发明已经参考某些示例性实施例进行了说明和描述,但是本领域技术人员应当理解,在不脱离由随附的权利要求书所界定的本发明的精神和范围的情况下可以对所描述的实施例进行各种修改和改变。

Claims (29)

1.一种蜂窝状结构,包括
至少一个金属玻璃板片,被配置为形成包含至少一个元胞的网格;
布置于至少所述网格的至少一个水平侧面上的至少一个至少部分扁平的板片;以及
其中所述至少一个金属玻璃网格具有比所述金属玻璃的塑性区半径小的厚度。
2.根据权利要求1所述的蜂窝状结构,包括至少两个至少部分扁平的板片,其中所述至少一个金属玻璃网格被布置于所述至少两个板片之间。
3.根据权利要求1所述的蜂窝状结构,其中所述至少一个至少部分扁平的板片包括金属玻璃。
4.根据权利要求3所述的蜂窝状结构,其中所述至少一个至少部分扁平的板片具有比所述金属玻璃的所述塑性区半径小的厚度。
5.根据权利要求1所述的蜂窝状结构,其中所述网格的几何形状被配置为使得所述网格的塑性塌陷强度为所述金属玻璃的塑性屈服强度的至少50%。
6.根据权利要求1所述的蜂窝状结构,其中所述网格的几何形状被配置为使得所述网格的密度小于所述金属玻璃的密度的50%。
7.根据权利要求1所述的蜂窝状结构,其中所述网格的几何形状被配置为使得所述网格的比强度大于所述金属玻璃的比强度。
8.根据权利要求1所述的蜂窝状结构,其中所述金属玻璃的塑性区半径(rp)由公式rp=Klc 2/πσy 2确定,其中Klc是所述金属玻璃的I型断裂韧度,以及σy是所述金属玻璃的塑性屈服强度。
9.根据权利要求1所述的蜂窝状结构,其中所述网格的塑性塌陷强度(σ)由公式σ=Aσy(t/l)n确定,其中σy是所述金属玻璃的塑性屈服强度,t是所述板片的厚度,l是所述元胞面的宽度,以及其中A为4-7并且n为1-3。
10.根据权利要求9所述的蜂窝状结构,其中A约为6,并且n约为2。
11.根据权利要求1所述的蜂窝状结构,其中所述网格的密度(ρ)由公式ρ=Bρs(t/l)确定,其中ρs是所述金属玻璃的密度,t是所述板片的厚度,l是所述元胞面的宽度,以及B为1-3。
12.根据权利要求11所述的蜂窝状结构,其中B约为2。
13.根据权利要求1所述的蜂窝状结构,其中所述至少一个金属玻璃网格包括选自Fe基合金、Co基合金、Mg基合金、Al基合金、Zr基合金、Ti基合金、Au基合金、Pt基合金、Ni基合金、Pd基合金及稀土基合金中的材料。
14.根据权利要求1所述的蜂窝状结构,其中所述至少一个至少部分扁平的板片包括选自聚合物、环氧树脂、玻璃、木材、陶瓷、金属、金属玻璃及它们的合成物中的材料。
15.根据权利要求1所述的蜂窝状结构,其中所述至少一个至少部分扁平的板片包括与所述网格相同的金属玻璃。
16.根据权利要求1所述的蜂窝状结构,其中所述网格具有选自蜂巢形、棱柱形、六边形、方形、三角形、菱形及桁架形(nuvtrusses)中的几何形状。
17.一种蜂窝状电子设备外壳或框架,包括:
具有用于界定至少一个隔间的壁的主体,其中所述隔间被设计为至少部分包住至少一个电子构件;
其中所述主体的至少一部分由至少一个金属玻璃板片和至少一个至少部分扁平的板片形成,所述至少一个金属玻璃板片被配置为形成包含至少一个元胞的网格,并且所述至少一个至少部分扁平的板片被布置于所述网格的至少一个水平侧面上;以及
其中所述至少一个金属玻璃网格具有比所述金属玻璃的塑性区半径小的厚度。
18.根据权利要求17所述的外壳,包括至少两个至少部分扁平的板片,其中所述至少一个金属玻璃网格被布置于所述至少两个实心板片之间。
19.根据权利要求17所述的外壳,其中所述至少一个至少部分扁平的板片由金属玻璃形成。
20.根据权利要求19所述的外壳,其中所述至少一个至少部分扁平的板片具有比所述金属玻璃的塑性区半径小的厚度。
21.根据权利要求17所述的外壳,其中所述网格的几何形状被配置为使得所述网格的塑性塌陷强度为所述金属玻璃的塑性屈服强度的至少50%。
22.根据权利要求17所述的外壳,其中所述网格的几何形状被配置为使得所述网格的密度小于所述金属玻璃的密度的50%。
23.根据权利要求17所述的外壳,其中所述网格的几何形状被配置为使得所述网格的比强度大于所述金属玻璃的比强度。
24.根据权利要求17所述的外壳,其中所述网格具有选自蜂巢形、棱柱形、六边形、方形、三角形、菱形及桁架形(nuvtrusses)中的几何形状。
25.根据权利要求17所述的外壳,其中所述主体具有至少一个开口。
26.根据权利要求25所述的外壳,其中所述至少一个开口被配置以允许达到所述至少一个电子构件。
27.根据权利要求17所述的外壳,其中所述主体包括固定地或可移动地互连的至少两个分离部件。
28.根据权利要求17所述的外壳,其中所述主体形成用于选自移动电话、PDA、便携式计算机及数码相机中的电子设备的外壳。
29.根据权利要求16所述的外壳,其中所述外壳给所述电子构件提供至少部分电子干扰保护。
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