Ceramic protection plates brazed to aluminum brake discs

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• 作者：L. Gorjan^a ; ^{lovro.gorjan@empa.ch" class="auth_mail" title="E-mail the corresponding author} ; ^{lovro.gorjan@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; M. Boretius^b ; G. Blugan^a ; F. Gili^c ; D. Mangherini^c ; X. Lizarralde^d ; M. Ferraris^e ; T. Graule^a ; A. Igartua^f ; G. Mendoza^f ; J. Kuebler^a
• 关键词：Ceramic ; Wear resistant ; Soldering ; Brazing ; Aluminum brake disc
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：1 November 2016
• 年：2016
• 卷：42
• 期：14
• 页码：15739-15746
• 全文大小：8179 K

文摘

Aluminum alloys are light-weight and one of the most interesting material solutions to optimize the strength/weight ratio to reduce car weight; however they are also relatively soft and therefore cannot be used for intensive wear applications. We developed an aluminum alloy part combined with hard and wear-resistant Al₂O₃-based ceramic plates on the surface for demanding mechanical parts for automotive industry such as disc brakes.

Tribological tests of various engineering ceramic materials were performed in order to find a ceramic material with a combination of coefficient, wear resistance and thermal energy dissipation for the car brakes. Al₂O₃-based ceramic showed promising properties, as well as being cost effective.

Two different approaches to braze ceramic on aluminum were investigated. A two-step brazing process using Cu-Sn-Ti-Zr filler alloy and a single step ultrasonic active soldering with Sn-Ag-Ti filler alloy. Larger areas of aluminum could be covered with a segmented brake design in which many ceramic plates were joined surface. Comparable tribological properties to those of the bulk ceramic material were achieved.