Using Cyanoacrylate Binder in Manufacturing of a Novel Polymer - Based Thick Coating and Determining its Mechanical and Thermal Properties

Protective coating of components, especially by the application of a film containing ceramic particles is one of the most rapidly changing technologies involving a wide range of recently developed techniques. The present study focuses on the development of a novel ceramic coating technique. This novel method uses a mixture comprising fine grain alumina powder and reactive cyanoacrylate monomer (ethyl cyanoacrylate and alcoxy-ethyl cyanoacrylate) as a binder. This paper describes the outcome of an experimental investigation into controlling of polymerazation reaction rate of cyanoacrylate during mixing, application and curing of the coating mixture. Polymerisation of the cyanoacrylate is inhibited during the mixing stage by means of dissolving Para-tolune sulfonic acid and is initiated in a controlled manner using caffeine powder. Coatings have been successfully deposited onto aluminium substrates. SEM micrographs show good uniformity of the coating and that successful adhesion can be achieved, as also shown by joint shear strength test results. In addition, the coating mixture can be used on irregular as well as flat surfaces. It was found that with increasing the amount of polymerization initiator in the mixture, porosity was increased and hardness of the coating as well as adhesion strength at the interface was reduced. Moreover, when the volume percentage of powder in mixture increased, the hardness improved but the adhesion strength at the interface reduced. This paper also presents the results of debinding of the coating mixture. It is suggested that working temperature for the coating is up to 140