CN101802266A - 用于铝的表面处理的工艺和具有电触点的铝零件的层结构 - Google Patents
用于铝的表面处理的工艺和具有电触点的铝零件的层结构 Download PDFInfo
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Abstract
本发明提出一种用于铝的表面处理的工艺,用于形成电接触,还提出一种相应的零件,其中,铝表面上的氧化层在第一步骤中例如通过酸洗被去除,在氧化层再次形成之前,该表面通过湿式化学方式利用具有锆或钛的金属离子的转换层密封。
Description
技术领域
根据独立权利要求1、6和10的一般特征,本发明涉及用于铝的表面处理的工艺,且涉及铝零件的层结构,例如用于与超声换能器(transducer)接触。
背景技术
作为例子,对于例如那些构造有隔膜的用于超声换能器的零件,其具有铣削的或深拉延的铝几何结构,其中电触点,尤其是接地触点,不得不形成在铝几何结构和例如超声换能器这样的电元件之间,例如用于降低EMC灵敏度。在汽车工程中,使用基于超声的环绕区域记录系统,该系统例如从DE 102 37 721A1中已知且具有至少一个超声传感器,其中每个超声传感器发射超声信号,该信号被可能的障碍物反射且可被同一超声传感器和/或被其它超声传感器接收。
在这种情况下,超声信号通过压电陶瓷(piezoceramic)产生,该压电陶瓷粘附地结合到铝几何结构的内侧作为电元件。这里,压电陶瓷通常通过非导电粘接剂被粘附地结合到铝几何结构的非导电铝氧化层(aluminumoxide layer),在这种情况下,氧化层总是在表面清洁处理(例如腐蚀或机加工)后的短时间内在铝的表面上再次形成。
对于铝上的必须实现的电连接,存在专门的焊料(solder),但是这些焊料不得不通过大量的腐蚀焊剂(flux)来钎焊,且这由此不得不通过清洗来去除。但是,随后在自动装配线上进行要求的清洗和干燥是困难的。此外,超声换能器的振动敏感隔膜基底(其上仅允许少量的焊料)上的焊料点具有临界变量,以避免影响超声换能器的操作。铝焊料仅具有填充焊丝的形式且将可能产生过量的焊料且由此产生过度的惯性质量。
用于这种元件的接地连接的现有惯常工艺具有一系列缺陷。这些例如由大量的焊料或者在编织物与隔膜上的铝焊料钎焊期间或在电阻焊期间的高温导致,或由编织物在隔膜上的模锻期间、插脚压入隔膜期间或编织物在隔膜上的结合期间的机械损伤造成。
发明内容
本发明基于一种用于铝的表面处理的工艺,用于制造电触点,其中,根据本发明,铝表面上的氧化层在第一步骤中有利地去除,且在第二步骤中,在氧化层再次形成之前,该表面用转换层密封,该转换层具有加入的金属离子。氧化层可通过腐蚀而被简单地去除,该表面可利用锆或钛金属离子而被湿式化学方法地密封。
除了表面准备工艺(其通常惯用于脱脂、腐蚀或酸洗),例如用于准备铝表面的上漆,根据本发明,溶解在液体中的金属离子,例如钛或锆,被用于在清洁的铝上使导电金属层富集,其同时还很少与氧反应且防止氧化层重新形成。
随后可在密封且导电的表面上经由本身已知的方式通过导电粘接剂与电元件形成接触。但是,另一方面,漆或类似的绝缘介质或抗腐蚀介质也可在另外的涂覆步骤中被施加到该密封的表面。
在根据本发明的铝零件的情况下,通过上述步骤在铝的表面上产生的层结构可由此被以简单的方式使用,以与一元件形成电接触。
作为例子,该元件可以是压电陶瓷元件,其接地触点则与铝零件的表面形成电接触。根据一个特别有利的实施例,该零件优选地具有中空柱形的、例如铣削的或深拉延(deep-drawn)的内部几何结构,利用隔膜作为终端,作为电元件的超声换能器可被以机械固定的方式施加到该隔膜的内侧以产生与隔膜的电接地触点。作为例子,这种零件可以是用于机动车的停车辅助系统中的环绕区域记录系统的超声换能器的构件,该系统在本说明的介绍部分提及。
根据本发明,在铝上产生导电涂层且使氧化层同时去除由此是便宜的且容易重复。以此方式制备的表面使得可以通过粘接剂、导电粘接剂或通过简单的钎焊实现永久粘附。在最终组装中不要求附加的制造步骤,可以将根据本发明的涂层施加到例如隔膜的内侧和外侧;在内侧上作为导电表面和作为腐蚀保护和作为用于机械固定粘接剂结合的表面,在外侧上作为腐蚀保护和作为用于上漆的基底。
附图说明
本发明的示例性实施例通过参考附图予以解释,在附图中:
图1示出了穿过用来形成用于超声换能器的隔膜的铝零件的截面,该零件已被利用根据本发明的工艺处理过;
图2示出了穿过图1所示的零件的截面,该零件与压电陶瓷元件形成电接触,在这种情况下该元件是超声换能器;
图3示出了穿过图1所示的零件的截面,压电陶瓷超声换能器通过一道导电粘接剂与该零件形成电接触;
图4示出了穿过图3所示的零件的横截面;和
图5示出了穿过图1所示的零件的截面,压电陶瓷超声换能器通过内隔膜表面上的连接件而与该零件形成电接触。
具体实施方式
图1示出了穿过铝零件的截面,该铝零件用来形成用于超声换能器的隔膜1,其设置有包括内表面2a和外表面2b的转换层2,在内侧上产生导电性且同时提供腐蚀保护、改善粘接性、防止氧化层再次形成,且在外侧上形成使漆层更好粘附的腐蚀保护。
在这种情况下,通过在第一步骤中去除隔膜1的铝表面上的氧化层,和在第二步骤中,在氧化层再次形成之前,通过利用具有加入了锆或钛金属离子的转换层2,或2a、2b密封隔膜1的表面,形成转换层2,或2a、2b。氧化层可在第一步骤中通过腐蚀简单地去除,且该表面可利用金属离子以湿式化学方法密封。
图2示出了超声换能器3形式的压电陶瓷元件如何以接地接触的形式通过导电粘接剂4而在隔膜1的内侧被导电地连接到隔膜1。然后通过用于接地连接的触点5和用于其它电势的触点6,与超声换能器3在外侧上形成接触。接地连接在这里通过导电表面7形成,该表面例如利用导电粘接剂4在超声换能器3上围在其周围。
图3示出了超声换能器3经由一道8导电粘接剂到隔膜1的替换接地连接,该道粘接剂在侧部从隔膜1的导电表面经由超声换能器3上的导电接地表面9引(route)到接地触点5。在这方面,图4示出了一横截面,其设置有相同的附图标记。
图5还示出了超声换能器3的替换电连接,该超声换能器与隔膜1电接触,其中钎焊端子10设置在隔膜1的内表面上,该内表面连接到超声换能器3的接地电势,该超声换能器与隔膜1的内表面通过导电粘接剂4电接触,且然后通过该接触与触点5接触。
Claims (10)
1.一种用于铝的表面处理的工艺,用于制造电触点,其特征在于,铝表面上的氧化层在第一步骤中去除,在第二步骤中,在氧化层再次形成之前,该表面利用具有加入的金属离子的转换层密封。
2.如权利要求1所述的工艺,其特征在于,氧化层通过腐蚀去除。
3.如权利要求1或2所述的工艺,其特征在于,所述表面通过锆或钛金属离子而以湿式化学方法密封。
4.如前述权利要求中任一项所述的工艺,其特征在于,在所述密封的表面上通过导电粘接剂(4)与电元件形成接触。
5.如前述权利要求中任一项所述的工艺,其特征在于,漆或类似的绝缘介质或抗腐蚀介质在另外的涂覆步骤中被施加到所述密封的表面。
6.一种铝零件,在一元件和该表面上的层结构之间具有电接触,所述层结构通过根据前述权利要求中任一项所述的工艺制造,其特征在于,该元件是压电陶瓷元件,其接地触点与铝零件的表面形成电接触。
7.如权利要求6所述的零件,其特征在于,所述零件具有带有隔膜(1)的中空柱形的内部几何结构,作为电元件的超声换能器(3)以机械固定的方式被施加到该隔膜的内侧,以产生与隔膜(1)的电接地触点(5)。
8.如权利要求6或7所述的零件,其特征在于,电接地触点(5)从隔膜(1)经由一道(8)导电粘接剂引到超声换能器(3)。
9.如权利要求6或7所述的零件,其特征在于,电接地触点(5)经由隔膜(1)上的钎焊端子(10)引导。
10.一种根据权利要求6至9中任一项所述的零件的用途,其特征在于,该零件是用于机动车停车辅助系统中的环绕区域记录系统的超声传感器的构件。
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DE102007043479A DE102007043479A1 (de) | 2007-09-12 | 2007-09-12 | Verfahren zur Oberflächenbehandlung von Aluminium und ein Schichtaufbau eines Bauteils aus Aluminium mit einer elektrischen Kontaktierung |
DE102007043479.2 | 2007-09-12 | ||
PCT/EP2008/005574 WO2009036826A1 (de) | 2007-09-12 | 2008-07-09 | Verfahren zur oberflächenbehandlung von aluminium und ein schichtaufbau eines bauteils aus aluminium mit einer elektrischen kontaktierung |
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DE102009040028B4 (de) | 2009-09-03 | 2016-06-23 | Valeo Schalter Und Sensoren Gmbh | Ultraschallwandler und Verfahren zur Herstellung eines Ultraschallwandlers |
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DE102005017088A1 (de) * | 2005-04-13 | 2006-10-19 | Stiftung Institut für Werkstofftechnik | Schutzschichten |
GB0511460D0 (en) * | 2005-06-06 | 2005-07-13 | Univ Liverpool | Process |
JP2007060340A (ja) | 2005-08-25 | 2007-03-08 | Nippon Ceramic Co Ltd | 超音波送受波器 |
-
2007
- 2007-09-12 DE DE102007043479A patent/DE102007043479A1/de not_active Withdrawn
-
2008
- 2008-07-09 CN CN2008801067016A patent/CN101802266B/zh active Active
- 2008-07-09 EP EP08773923.1A patent/EP2188415B1/de active Active
- 2008-07-09 US US12/677,897 patent/US8549746B2/en active Active
- 2008-07-09 WO PCT/EP2008/005574 patent/WO2009036826A1/de active Application Filing
Also Published As
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EP2188415A1 (de) | 2010-05-26 |
US8549746B2 (en) | 2013-10-08 |
US20100213793A1 (en) | 2010-08-26 |
CN101802266B (zh) | 2012-01-11 |
EP2188415B1 (de) | 2015-09-30 |
WO2009036826A1 (de) | 2009-03-26 |
DE102007043479A1 (de) | 2009-03-19 |
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