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Surface preparation of alumina for improved adhesive bond strength in armor applications

Harris, AJ, Vaughan, B, Burnage, ST, Yeomans, JA and Smith, PA (2013) Surface preparation of alumina for improved adhesive bond strength in armor applications Ceramic Engineering and Science Proceedings, 33 (5). pp. 149-159.

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Surface treatments of alumina have been investigated with the aim of increasing the strength of the bond created between the alumina and a toughened epoxy adhesive. Four surface conditions have been assessed: as-fired; grit blasted; and krypton fluoride excimer laser treated under two sets of conditions. Compared with the as-fired surface, the grit blasted surface was rougher with poorer wettability, probably due to surface contamination. It was found that the laser treatments removed some of the sintering additives and caused rounding of the alumina grains, slightly increasing the surface roughness. Further, the laser treatment led to an increased surface energy and wettability, which has been linked tentatively to an observed increase in the hydroxyl groups on the surface. The adhesive bond strength was assessed by testing joints in tension and shear. It was found that the laser treated surfaces demonstrated slight improvements in bond strength, with a cohesive failure of the adhesive in tension for surfaces subjected to one of the two laser treatments, compared with failure at the interface for the as-fired, grit blasted and other laser treated samples in tension and for all samples in shear. Thus, it has been demonstrated that modifications to the surface of alumina can result in mechanical and chemical changes which affect roughness, wettability, bond strength and the locus of failure.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :
Date : 2013
Identification Number : 10.1002/9781118217498.ch14
Additional Information : Post-print uploaded with the permission of the American Society of Ceramic. Copyright © American Society of Ceramic.
Depositing User : Symplectic Elements
Date Deposited : 10 Jun 2013 11:00
Last Modified : 23 Sep 2013 20:10

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