Lyasnikov V. N. RussiaSaratovYuri Gagarin State Technical University of Saratov, 77, Politechnicheskaya Str., Saratov, 410054, Russialyasnikovaav@mail.ru Author's articles Model of the Processes Nanostructure Formation during Plasma Spraying Hydroxyapatite Porous-Powder Coatings