Konganuku ira whakakoero

Rewa o te whakarewa - ko te tukanga thermodynamic motuhake i roto i i huna i te karaihe wini whakakahokaho whakarewa te ka taui te reira i te wāhanga totoka ki te wai.

whakarewa pāmahana rewa - te pāmahana o te wae whakarewa wera, e tīmata ki runga ki pa i te whakawhitinga wā (rewa). Ko te tukanga iho whātioatanga me te whakataka veteki ki reira. Hei rewa whakarewa? Me te hana o te reira te whakamahi i te pūtake wera waho ki te pāmahana rewa, a ka haere tonu ki te tuku wera ki te hinga i te pūngao wāhanga whakawhitinga. Ko te take i te pāmahana rewa whakarewa ano tohu te pāmahana i ai te rauemi e kia i roto i te wāhanga taurite i te atanga i waenganui i te wai, me te totoka. I tenei pāmahana, ka taea e te whakarewa parakore te tīariari te wā kotahi e rua i roto i te mārō, me te i roto i te āhua wai. Hei kawe i te tukanga rewa ko reira e tika ana ki te overheat te whakarewa he paku nui ake i te pāmahana taurite ki te whakarato i te pūmanawa pai thermodynamic. Homai he ahua o te whanaketanga ki te tukanga.

Ko tamau whakarewa rewa pāmahana anake hoki matū parakore. Ka nuku te aroaro o poke te pūmanawa taurite i roto i tetahi aronga ranei tetahi. Ko tenei no te mea te poke whakarewa ki te rerekē momo karaihe whakakahokaho, me ngota kaha taunekeneke i roto i a ratou ka rerekē i te hunga katoa e kitea i roto i te materialah.V parakore i runga i te nui o te pāmahana rewa te wehea te maitai fusible ki (ki runga, ki te 600 ° C, pērā i gallium rānei , mēkuri), meltability reo (600-1600 ° C, parahi, konumohe) me te tiketike-rewa (> 1600 ° C, Tungsten, me molybdenum).

I roto i te ao i teie mahana o konganuku parakore e uaua whakamahia e tika ana ki te meka e whai ratou i te iti whānuitanga o ngā āhuatanga ōkiko. He Ahumahi roa, me te piri whakamahi ngā ngā o konganuku - koranu, a he nui nui momo āhuatanga. konganuku ira whakakoero no ki te alloys rerekē ka rerekē hoki i te pāmahana rewa o te koranu. ngä nohanga rerekē o te matū meinga te tikanga o to ratou rewa whātioatanga ranei. Heoi, i reira ko nga nohanga taurite i ai te konganuku no ki te koranu rewa tā i te wa ano ranei, i.e. tikanga rite te rauemi ōrite. E huaina taua alloys eutectic.

E matau te pāmahana rewa ko te tino nui ka mahi ki whakarewa, e hiahiatia ana tenei uara te rua i roto i te te hanga tawhā mō te tātai alloys me hua whakarewa i roto i te mahi, no te te pāmahana o te wāhanga whakawhitinga o te rauemi i hanga i nei te hua, whakatau whāititanga i roto i tona whakamahi. Hoki te haratau, e haapotohia enei i roto i te kotahi tepu. Ripanga konganuku rewa - hua te kōtuitanga o tūhuratanga tinana o ngā āhuatanga o te konganuku rerekē. He hoki tepu me alloys rite. Ko te wāhi whakarewa whakakoero hoki nui tei runga i te pēhanga, na te tepu raraunga e hāngai ana ki te uara pēhanga ngā (te tikanga he huru noa ka pēhanga he 101,325 kPa). Ko te teitei te pēhanga, te pāmahana rewa teitei, a hurihia.