Koranu Kanthal AF 837 ātete alchrome Y koranu fecral

He koranu rino-konupora-konumohe ferritic (koranu FeCrAl) te Kanthal AF hei whakamahi i ngā pāmahana tae atu ki te 1300°C (2370°F). He tino pai te ātete ki te waikura me te tino pumau o te āhua o te koranu, ā, he roa te ora o te huānga.

Ko te Kan-thal AF e whakamahia ana i roto i ngā wāhanga whakamahana hiko i roto i ngā oumu ahumahi me ngā taputapu whare.

Hei tauira o ngā whakamahinga i roto i te umanga taputapu ko ngā huānga mika tuwhera mō ngā tōstare, ngā whakamaroke makawe, ngā huānga āhua pikopiko mō ngā whakamahana pā, me ngā huānga koiri tuwhera i runga i te rauemi whakamahana muka i roto i ngā whakamahana karāhe uku i roto i ngā oumu, i roto i ngā whakamahana uku mō ngā pereti kohua, ngā koiri i runga i te muka uku whakarewa mō ngā pereti tunu kai me ngā oumu uku, i roto i ngā huānga koiri iri mō ngā whakamahana pā, i roto i ngā huānga waea tika iri mō ngā radiator, ngā whakamahana kawe hiko, i roto i ngā huānga porcupine mō ngā pū hau wera, ngā radiator, me ngā whakamaroke mīhini.

Whakarāpopototanga I roto i tēnei rangahau, ka whakamāramahia te tikanga waikura o te koranu FeCrAl arumoni (Kanthal AF) i te wā e whakamahanahia ana i roto i te hau hauota (4.6) i te 900 °C me te 1200 °C. I mahia ngā whakamātautau isothermal me te thermo-cyclic me ngā wā whakaaturanga rerekē, ngā tere whakamahana, me ngā pāmahana whakamahana. I mahia te whakamātautau waikura i roto i te hau me te hau hauota mā te tātari thermogravimetric. Ka tautuhia te hanganga moroiti mā te karu hiko matawai (SEM-EDX), te tirotiro hiko Auger (AES), me te tātari hihi katote arotahi (FIB-EDX). E whakaatu ana ngā hua ko te haere whakamua o te waikura ka puta mā te hanganga o ngā rohe nitridation o raro i te mata, he mea tito mai i ngā matūriki wāhanga AlN, e whakaiti ana i te mahi konumohe, ā, ka puta te pakarukaru me te pakarukaru. Ko ngā tukanga o te hanganga Al-nitride me te tipu unahi Al-oxide e whakawhirinaki ana ki te pāmahana whakamahana me te tere whakamahana. I kitea he tere ake te tukanga whakahāngaitanga o te koranu FeCrAl i te waikura i te wā e whakamahanahia ana i roto i te hau hauota he iti te pēhanga hāora, ā, koinei te tino take o te pirau o te koranu.

Kupu Whakataki E mōhiotia whānuitia ana ngā koranu FeCrAl (Kanthal AF ®) mō tō rātou ātete pai ki te waikura i ngā pāmahana teitei. E pā ana tēnei āhuatanga pai ki te hanganga o te tauine alumina pumau i runga i te mata, e tiaki ana i te rauemi mai i te waikura anō [1]. Ahakoa ngā āhuatanga ātete waikura pai ake, ka taea te whakawhāiti i te roanga o te ora o ngā wāhanga i hangaia mai i ngā koranu FeCrAl mēnā ka maha ngā wāhanga e pāngia ana e te huringa wera i ngā pāmahana teitei [2]. Ko tētahi o ngā take mō tēnei ko te paunga o te huānga hanga tauine, te konumohe, i roto i te anga koranu i te rohe o raro i te mata nā te pakaru o te wera me te whakahounga o te tauine alumina. Mēnā ka heke te ihirangi konumohe e toe ana i raro i te kukū nui, kāore e taea e te koranu te whakahou i te tauine tiaki, ka hua ake he waikura pakaru kino mā te hanganga o ngā waikura rino me ngā waikura chromium e tere tipu haere ana [3,4]. I runga i te āhuarangi e karapoti ana me te urunga o ngā waikura mata, ka taea e tēnei te āwhina i te waikura ā-roto, te nitridation rānei me te hanganga o ngā wāhanga kāore e hiahiatia ana i roto i te rohe o raro i te mata [5]. Kua whakaaturia e Han rāua ko Young i roto i te tauine alumina e hanga ana i ngā koranu Ni Cr Al, ka puta he tauira matatini o te waikura ā-roto me te nitridation [6,7] i te wā o te huringa wera i ngā pāmahana teitei i roto i te hau, inā koa i roto i ngā koranu kei roto ngā kaihanga nitride kaha pēnei i te Al me te Ti [4]. E mōhiotia ana he uruhanga hauota ngā tauine chromium oxide, ā, ka puta te Cr2 N hei paparanga tauine iti, hei matūriki ā-roto rānei [8,9]. E tika ana kia kaha ake tēnei pānga i raro i ngā āhuatanga huringa wera e arahi ana ki te pakaru o te tauine oxide me te whakaiti i tōna whai huatanga hei ārai ki te hauota [6]. Nō reira, ko te whanonga waikura e whakahaerehia ana e te whakataetae i waenga i te waikura, e arahi ana ki te hanganga/te tiaki o te alumina tiaki, me te urunga hauota e arahi ana ki te nitridation ā-roto o te matrix koranu mā te hanganga o te wāhanga AlN [6,10], e arahi ana ki te pakaru o taua rohe nā te whānui wera teitei ake o te wāhanga AlN ki te whakataurite ki te matrix koranu [9]. Ina whakaatuhia ngā koranu FeCrAl ki ngā pāmahana teitei i roto i ngā āhuarangi me te hāora, ētahi atu kaituku hāora rānei pērā i te H2O, te CO2 rānei, ko te waikura te tauhohenga matua, ā, ka puta he unahi alumina, kāore e uru ki te hāora, ki te hauota rānei i ngā pāmahana teitei, ā, ka whakarato i te tiaki mai i tā rātou urunga ki roto i te anga koranu. Engari, ki te whakaatuhia ki te āhuarangi whakaiti (N2+H2), me te pakaru unahi alumina tiaki, ka tīmata te waikura pakaru ā-rohe mā te hanganga o ngā waikura Cr me Ferich kore-tiaki, e whakarato ana i te ara pai mō te horapa o te hauota ki roto i te anga ferritic me te hanganga o te wāhanga AlN [9]. Ko te āhuarangi hauota tiaki (4.6) e whakamahia pinepinetia ana i roto i te tono ahumahi o ngā koranu FeCrAl. Hei tauira, ko ngā whakamahana ātete i roto i ngā oumu maimoatanga wera me te āhuarangi hauota tiaki he tauira o te tono whānui o ngā koranu FeCrAl i roto i taua taiao. E ai ki ngā kaituhi he puhoi ake te tere waikura o ngā koranu FeCrAlY ina whakamahanahia i roto i te āhuarangi me te iti o te pēhanga hāora [11]. Ko te whāinga o te rangahau he whakatau mēnā ka pā te whakamahana i roto i te hau hauota (4.6) (taumata poke motuhake a Messer® O2 + H2O < 10 ppm) ki te ātete waikura o te koranu FeCrAl (Kanthal AF) me te nui o tōna whakawhirinaki ki te pāmahana whakamahana, tōna rerekētanga (hurihuri wera), me te tere whakamahana.