Abstract
The paper present the results of the synthesis of a new refractory coating based on basalt for the protection of metal construction under conditions of cavitation. Initial basalt samples obtained from the locality Vrelo - Kopaonik. The basalt based refractory filler was obtained by crushing and grinding selected samples of basalt rock. XRD, SEM and optical microscopy methods were used to characterize the obtained filler samples. The research defined the composition of basalt -based coating with epoxy resinbased binder, organic additives and organic solvent. The resistance properties of protective coatings applied to metal surface were investigated using the ultrasonic vibration method with a stationary sample according to the ASTM G 32 standard. To evaluate the resistance of the sample surface to the action of cavitation, the sample surface was examined before and during testing. The surface of the samples was monitored by scanning electron microscopy in order to analyze the morphology of surface damage. Computer image analysis according to the Image Pro Plus program was applied to assess the damage to the sample surface. The obtained test results showed high resistance of the coating layers to the effect of cavitation, with small mass losses, small damage to the coating surface and a cavitation rate of 0,1 mg/min.
Highlights
Намера издавача је да читаоцима, посебно онима који припремају стручни испит предвиђен Законом о рударству и геолошким истраживањима, као и свима онима који раде на екплоатацији минералних сировина и свакодневно се сусрећу са прописима из ове области, понуди у две књиге све важније прописе које треба да познају
To sve govori o visokoj otpornosti ove vrste vatrostalnih premaza na kavitaciona opterećenja i na mogućnost njihove primene za zaštitu radnih površina opreme koja je tokom eksploatacije izložena kavitacionim naprezanjima
Beograd Prof. dr Dragoljub Živković, Univerzitet u Nišu, Mašinski fakultet, Niš Prof. dr Radan Durković, Univerzitet Crne Gore, Mašinski fakultet, Podgorica Prof. dr Zdravko Milovanović, Univerzitet u Banja
Summary
Kao vatrostalni punioc u sastavu premaza primenjen je bazaltni prah, prečnika zrna 20 μm, dobijen drobljenjem, mlevenjem i mikonizacijom uzoraka bazaltnih stena iz ležišta Vrelo - Kopaonik. Tokom istraživanja određen je sastav i parametri sinteze zaštitnih premaza,što je prikazano u tabeli 1. Za ispitivanje dobijeni zaštitni premazi su nanepremaza su postupno dodavane uz stalno mešanje (mi- seni u dva sloja na metalnu pločicu (oznaka uzorka: ksiranje). Slika 1 - Zaštitni premaz na bazi bazalta (uzorak PP): a) punioc na bazi bazalta; b) fotografija površine premaza; c) SEM mikrofotografija osušenih slojeva premaza. Za ispitivanje kavitacione otpornosti zaštitnih premaza korišćena je ultrazvučna vibraciona metoda (sa stacionarnim uzorkom) prema standardu ASTM G32 [20, 21] i proceduri opisanoj u objavljenim radovima [6, 22, 23]. Tokom ispitivanja koncentrator mehaničkih vibracija je svojim donjim krajem uronjen u vodeno kupatilo temperature 25±10C. Uzorak koji se ispituje postavljen je ispod čeone površine koncentratora vibracija sa zazorom 0.5 mm. Ispod čeone površine koncentratora i stacionarnog ispitivanog uzorka, obrazuje se jaka kavitaciona zona. Svi dobijeni rezultati oštećenja površine uzoraka u vremenu dejstva kavitacije ilustrovani su dijagramima
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