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The effect of plasma arc powder surfacing process on the amount of B-4Cparticles in the coating and the thermal behavior ofB_4C particles in different surfacing stages has been investigated The results showed that the feeding rate of B_4c particles is.the most important factor affecting the amount of B)_4C particles in the surfacing coating among all the surfacing paraceters and the most part of B-4C particles in the coating is not the remainders of original solid B_4C particles particles but the consoliation products of the unmelted liquid B_4C globules in the pool. The results also showed that the B_4C particles would not be melted in the plasma arc column, their melting processmainly takes place in the anode spotregion on the surface of the pool when surfacing current is less than 200A.
The effect of plasma arc powder surfacing process on the amount of B-4C particles in the coating and the thermal behavior of B_4C particles in different surfacing stages has been investigated. The results showed that the feeding rate of B_4c particles is. The most important factor affecting the amount of B) _4C particles in the surfacing coating among all the surfacing paraceters and the most part of B-4C particles in the coating is not the remainsders of original solid B_4C particles but the consoliation products of the unmelted liquid B_4C globules in the pool. The results also showed that the B_4C particles would not be melted in the plasma arc column, their melting processmainly takes place in the anode spotregion on the surface of the pool when surfacing current is less than 200A.