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Adhesive bonding is a joining technique used in the manufacture and repair of a wide range of products. Along with welding and soldering, adhesive bonding is one of the basic joining processes. In this technique, components are bonded together using adhesives. The broad range of types of adhesives available allows numerous materials to be ...
To create a desirable surface for the adhesive bonding of plastics, there are three major requirements: the weak boundary layer of the given material must be removed or chemically modified to create a strong boundary layer; the surface energy of the adherend should be higher than that of the adhesive for good wetting; and the surface profile can be improved to provide mechanical interlocking.
This happens when the surface energy of the substrate is greater than the surface energy of the adhesive. However, high strength adhesives have high surface energy. Thus, their application is problematic for low surface energy materials such as polymers. To solve this problem, surface treatment is used as a preparation step before adhesive bonding.
Aluminium alloys are often used due to their high strength-to-weight ratio, corrosion resistance, low cost, high thermal and electrical conductivity.There are a variety of techniques to join aluminium including mechanical fasteners, welding, adhesive bonding, brazing, soldering and friction stir welding (FSW), etc. Various techniques are used based on the cost and strength required for the joint.
Adhesive bonding, which involves a chemical process where a substance is used to create a bond between two materials, is problematic because of extensive surface preparation, long curing time, the difficulty of bonding adhesive materials to plastics, etc.
Structural adhesives can be used to create load-bearing joints. Although many adhesives such as sealants, hot melt adhesives and even acrylic foam tapes can bear loads, the term structural adhesive is typically used where joints will have lap shear strength greater than 1450 psi. [3] The different types of structural adhesives are: Epoxies
A joint made through the use of an adhesive can be referred to as an adhesive joint or bond. Phases of Epoxy. The green strength of adhesives is the early development of bond strength of an adhesive. It indicated "that the adhesive bond is strong enough to be handled a short time after the adherents are mated but much before full cure is obtained."
Anodic bonding on silicon substrates is divided into bonding using a thin sheet of glass (a wafer) or a glass layer that is deposited onto the silicon using a technique such as sputtering. The glass wafer is often sodium-containing Borofloat or Pyrex glasses. With an intermediate glass layer, it is also possible to connect two silicon wafers. [6]
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