Titanium adhesive bonding
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Topic 1: Silane primer applications for thermoset epoxy bonding of thermoplastic polyurethanes to titanium surfaces. Discuss types of surface roughening to reduce the contact angle of the titanium, primer shelf life, application techniques, and curing temperatures.
Topic 2: Surface treatments of thermoplastic polyurethanes to improve thermoset epoxy bonding. Discuss the difference between corona, plasma, and IPA ultrasonic cleaning to reduce the contact angle and shelf life.
Topic 3: Contact angle measurement techniques. Discuss available goniometers, how they work, and test method validations.
Topic 4: Surface roughness techniques to improve adhesion to Grade 1 through 5 titanium. Discuss laser roughening using a fiber laser, the difference between Ra and Sa/Sdr surface measurements, and surface cooling methods.
2/25/2018: I'll go with Topic 4, surface roughness techniques to improve adhesion of thermoset epoxy to medical grade titanium.
Outline:
Methods for Surface Preparation of Titanium for Adhesive Bonding
Introduction: Discuss where Titanium is used in industry. Describe Titanium's oxide layer.
Testing of adhesion strength: Discuss the wedge test and how to precondition and exercise the bond joint.
Measuring surface roughness: Ra, Sa and Sdr.
Chemical methods:
Abrasive methods: Grit blasting with silicon carbide , sodium bicarbonate, alumina, and glass beads.
Etching:
Anodizing:
Laser roughening:
Primer application:
References:
Instructor Comments
Looks like you are interested in adhesive bonding of TPU to titanium. Then why not write an overview article on the topic, including typical adhesives, brief description of possible surface preparation for the TPU and titanium, and applications?
Regarding topic 3, there is already a Wikipedia article that discusses methods to measure contact angle, see https://en.wikipedia.org/wiki/Contact_angle#Measuring_methods
Please let me know which topic you select. Thanks!