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13.
Materiali v termoenergetiki
Nagode, Aleš, 1975-
Komponente v termoenergetskih centralah so izpostavljene visokim temperaturam in tlakom, zato je izbira materialov bistvenega pomena. Materiali morajo biti za uporabo v teermoenergetskih centralah ...odporni proti koroziji, razpokam ter morajo biti dobro varivi. Verjetno najpomembnejša lastnost, ki jo morajo imetitaksni materili, pa je odpornost proti lezenju, to je proti napredujoči plastični deformaciji, in s tem sposobnost materiala, da pri visokih temperaturah in obremenitvah zdrzi čim daljši čas. V zadnjih desetletjih se za uporabo v termoenergetskih centralah uporabljajo predvsem jekla z 9-12 % kroma. Odpornost proti lezenju v tovrstnih jeklih zagotavljajo drobni karbidi in karbonitridi, medtem ko krom zagotavlja odpornost proti koroziji. Za uporabo pri višjih temperaturah nad 650 [kompozitum]C razvijajo t.i. ODS-jekla, to so disperzijsko utrjena jekla z oksidi, ter zlitine na osnovi Ni. Te se danes že uporabljajo za prototipne komponente do temperatur 720 [kompozitum]C.
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