| 11. | The third way to achieve in-situ bonding consists of compaction of metal powders together with face sheets.
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| 12. | Facing sheets of rain, slippery streets, zones of cobblestone treachery and breakneck sprints, riders have kept to business.
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| 13. | The goal of in-situ bonding is to create a metallic bonding between the foam core and face sheets.
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| 14. | The melting point of the face sheet material is above the melting point of the foamable precursor material.
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| 15. | It has proven satisfactory in attaching stiffeners, such as hat sections to sheet, and face sheets to honeycomb cores.
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| 16. | Most flush hollow-core doors are faced with plywood with Philippine mahogany, or " lauan " as the face sheet.
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| 17. | Ex-situ bonding is achieved by gluing face sheets with an aluminium foam by adhesive bonding, brazing or diffusion bonding.
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| 18. | This is difficult to realize as the oxidation of both aluminium face sheets and foam prevent forming a sound bonding.
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| 19. | This procedure is successful when steel is used as face sheets instead of aluminium, while the foam core is aluminium.
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| 20. | The precursor composition is usually Al-Si, Al-Si-Cu or Al-Si-Mg alloys while the face sheets are 3xxx, 5xxx and 6xxx series aluminium alloys.
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