Fundamental experiments on wire explosion spraying - effect of discharging characteristics on sprayed coating -
Hesaki Masataka; Ochiai Yoshitaka; Hasebe Tadashi; Imaida Yutaka
Abstract:This paper extensively studies the effects of discharging condition on properties of sprayed coating by wire explosion. Charging energy and condenser capacity are ranged from 185 J to 415 J and 144 mF to 280 mF, respectively; small condenser capacity corresponds to large circuit frequency. Large charging energy as well as small condenser capacity result in small size and larger velocity of flying particles. It is shown that the particle size distribution is mainly dominated by charging energy. Flying particles with small diameter and large velocity give fine sprayed coating surface. The optimal combination of size distribution and velocity of flying particles, however, is necessary to increase mass of deposits and to obtain strong adhesion strength with the substrate. It is found that adhesion strength between substrate and sprayed coating is mainly dominated by mechanical bonding, i.e., anchoring effect. Key Words:wire explosion, sprayed coating, frequency of circuit, surface roughness, mass of deposit, anchoring effect