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Abstract

This work investigates the effect of surface treatments of two titanium alloys on adhesive joint strength over a wide range of temperatures using two commercial adhesives.

The literature surveyed is divided into two. The first deals with the metallography and surface chemistry of titanium and its alloys; while the second deals with theories of adhesion and locus of failure in metal-metal bonding. This indicates that interfacial failure is unlikely in properly formulated bonds. In the first part of the experimental work tensile testing in shear was used to examine the effect upon joint strength of various oxidation methods of the alloys. The results show that to obtain strong bonds, a rough and thin rutile surface is required. Then torsional shear testing was used to explore the effect on the joint strength of these oxidation methods over a wide range of temperatures. The results agree with those obtained by tensile testing.

Several techniques were employed to examine the fractured joints in order to study the locus of failure. The results indicate that some separation near the interface was taking place with the two adhesives. A mechanism for substrate failure was advanced and it suggests that a considerable element of mechanical adhesion is involved.

Publication Type:	Thesis (Doctoral)
Subjects:	Q Science Q Science > QD Chemistry
Departments:	School of Science & Technology School of Science & Technology > School of Science & Technology Doctoral Theses Doctoral Theses

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