Adhesives-9

Adhesives-9 - Adhesive Bonding MET 144 Introduction The...

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Adhesive Bonding MET 144
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Introduction The ideal adhesive bonds to any material, needs no surface preparation, and maintains a high bond strength under all operating conditions (this does not exist) Adhesives are used to bond metals, ceramics, glass, plastics, composite materials, woods, and even a variety of roofing materials
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Types of Adhesives Thermoplastic resins Thermosetting resins Artificial elastomers Ceramics
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Curing of Adhesives Heat Radiation or light Moisture Activators Catalysts Multiple component reactions Combination
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Structural Adhesives Epoxies Cyanoacrylates Anaerobics Acrylics Urethanes Silicones High-temperature Hot melts
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Epoxies Thermosetting epoxies are the oldest and most common and diverse of adhesives and join most engineering materials Properties include high adhesion, good tensile and shear strength (5000-10,000 psi) and toughness, high rigidity, good creep resistance, easy curing with little shrinkage, and tolerance to elevated temperatures (500 degrees F) 2 component blends or added heat used as curing technique Limited by low peel strength (measure of adhesives adhesion to the substrate), moisture sensitivity, and low temperature brittleness
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Adhesives-9 - Adhesive Bonding MET 144 Introduction The...

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