Comparison of the properties of hard coatings on the tool steel for hot work EN X37CrMoV5-1

U radu su analizirana svojstva tvrdih prevlaka nanesenih na alatni čelik za topli rad X37CrMoV5-1 PVD i PACVD tehnologijom. Nanesene prevlake su PACVD TiN, TiN/TiCN, TiN/TiBN i PVD TiNAlSiN. Analizirane su debljina prevlake, prionjivost, faktor trenja i nanotvrdoća prevlaka. Debljina prevlaka određena je kalotestom, prionjivost prevlaka ispitana je Rockwell-ovom metodom utiskivanja indentora prema normi VDI 3198, faktor trenja određen je metodom ispitivanja „kuglica na ploči“, a nanotvrdoća ispitana je na uređaju Helmut Fischer Fischerscope H100C na Institutu Jožef Stefan u Ljubljani. Ispitivanjem je utvrđeno kako PVD TiNAlSiN prevlaka daje najbolje rezultate za primjenu na kalupima za tlačni lijev aluminijskih legura zbog svoje dobre prionjivosti i izdržljivosti na visoke temperature.This thesis analyzes the properties of hard coating coated on hot working steel X37CrMoV5-1 with PVD and PACVD technology. The implemented coatings were PACVD TiN, TiN/TiCN, TiN/TiBN and PVD TiNAlSiN. Properties such as coating thickness, adhesion, friction factor and hardness by nanoindentation were analyzed. The coating thickness was tested using calotest, ahesion was tested using Rockwelll indenter penetration acording to the VDI 3198 norm, friction factor was determined by using „ball on flat“ method and hardness by nanoindentation was tested using Helmut Fischer Fischerscope H100C at the Jožef Stefan Institute in Ljubljana. The testings have determined that PVD coated TiNAlSiN coating has the best properties for coating die casts for casting aluminum alloys cause of their good adhesion and heat durability