The production process for spherical particles by flame spraying is a
method for exposing solid particles to the combustion flame and to fus
e them to make spheres. It is used for producing ceramic or metal sphe
rical particles. In the development of this process it is very importa
nt to analyze the fusing and sphering phenomena of solid particles qua
ntitatively. In this study a model of momentum and heat transfer in th
e process was formulated to analyze these phenomena. The velocity dist
ribution of the particles, the temperature distributions in the partic
le, and the melting state were calculated by this model. Spherical par
ticles of alumina and silica were produced in experiments using the fl
ame spray method. These experimental results were approximately in acc
ordance with the calculated ones. From these results, the model was fo
und to be very useful for process analysis of the production of spheri
cal particles from solid powder by the flame spray process.