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DTIC ADA114617: Bondability of Ti Adherends |
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by Defense Technical Information Center |
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Surface oxides on titanium prepared for adhesive bonding |
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by eight different pretreatment processes were examined |
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using STEM and Auger/ESCA techniques. The results |
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indicate that the surfaces can be divided into three |
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groups according to similarities in their oxide |
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morphologies: Group I exhibits little surface roughness; |
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Group II is characterized by macro-roughness (features |
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greater than 1.0 micrometers; and Group III exhibits |
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extensive porosity and microroughness, similar to |
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features found on aluminum prepared by the phosphoric |
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acid anodize process. Wedge tests (performed at NADC, but |
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discussed here) indicate that Group III adherends |
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(chromic acid anodize and alkaline peroxide treatments) |
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produce far more durable bonds than those in Groups I or |
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II. Hence, a direct correlation exists between oxide |
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morphology and bond durability for Ti adherends. We found |
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similar evidence for the importance of oxide morphology |
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to the properties of bondments in our prior work on Al |
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but with one important difference. Because Al oxides are |
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relatively unstable in a moist environment, the bond can |
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suffer long-term degradation. In contrast, the Ti oxides |
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are extremely stable against the effects of moisture. We |
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conclude, therefore, that the combination of oxide |
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stability and micro-roughness that can be developed on Ti |
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by the CAA or alkaline peroxide processes portends a very |
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bright future for adhesively bonded Ti structures. |
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Date Published: 2018-01-04 13:54:13 |
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Identifier: DTIC_ADA114617 |
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Item Size: 24688075 |
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Language: english |
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Media Type: texts |
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# Topics |
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DTIC Archive; Ditchek, B. M.; MARTIN ... |
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