Kanthal AF ingxubevange 837 resistohm alchrome Y fecral ingxubevange

I-Kanthal AF yi-ferritic iron-chromium-aluminium alloy (FeCrAl alloy) ukuze isetyenziswe kumaqondo obushushu ukuya kwi-1300 ° C (2370 ° F). I-alloy ibonakaliswe ngokumelana ne-oxidation ebalaseleyo kunye nozinzo oluhle kakhulu olukhokelela kubomi obude.

I-Kan-thal AF iqhele ukusetyenziswa kwizinto zokufudumeza zombane kwiziko lemizi mveliso kunye nezixhobo zasekhaya.

Umzekelo wezicelo kushishino lwezixhobo zombane zikwimica evulekileyo yeziqalelo zeethowusta, izomisi zeenwele, kwizinto ezimilise okwemilo yezifudumezi zefeni nanjengezinto ezivulekileyo zekhoyili kwizinto ezigqumayo kwifiber kwiglasi yeceramic kwizifudumezi eziphezulu kuluhlu, kwizifudumezi zeceramic kwiipleyiti ezibilayo, iikhoyili. kwifiyibha yeceramic ebunjiweyo yokupheka iipleyiti ezinezitofu zeseramic, kwizinto ezinqunyanyisiweyo zekhoyili kwizifudumezi zefeni, kwizinto zocingo ezimisiweyo ezithe ngqo kwiiradiyetha, izifudumezi ezihambisa amanzi, kwizinto ezinoburhaburha kwimipu yomoya oshushu, iiradiyetha, oomisi-mpahla.

Kuphononongo lwangoku, indlela yokubola ye-alloy ye-FeCrAl yorhwebo (i-Kanthal AF) ngexesha lokufakwa kwegesi yenitrogen (4.6) kwi-900 °C kunye ne-1200 °C ichaziwe. Uvavanyo lwe-Isothermal kunye ne-thermo-cyclic enamaxesha ahlukeneyo okuvezwa ewonke, amazinga okufudumeza, kunye namaqondo obushushu obushushu ayenziwa. Uvavanyo lwe-oxidation emoyeni kunye negesi ye-nitrogen lwenziwa ngohlalutyo lwe-thermogravimetric. I-microstructure ibonakala ngokuskena i-electron microscopy (SEM-EDX), i-Auger electron spectroscopy (AES), kunye nohlalutyo lwe-ion beam (FIB-EDX). Iziphumo zibonisa ukuba ukuqhubela phambili kwe-corrosion kwenzeka ngokubunjwa kwemimandla ye-nitridation ye-subsurface yangaphakathi, eyenziwe ngamaqhekeza esigaba se-AlN, esinciphisa umsebenzi we-aluminium kwaye sibangele ukuxhamla kunye nokusabalalisa. Iinkqubo zokubunjwa kwe-Al-nitride kunye nokukhula kwesikali se-Al-oxide kuxhomekeke kubushushu be-annealing kunye nezinga lokufudumeza. Kwafunyaniswa ukuba i-nitridation ye-alloy ye-FeCrAl yinkqubo ekhawulezayo kune-oxidation ngexesha lokungena kwigesi ye-nitrogen ene-oksijini ephantsi yoxinzelelo oluyinxenye kwaye imele oyena nobangela wokuthotywa kwe-alloy.

Intshayelelo ye-FeCrAl - i-alloys esekelwe (i-Kanthal AF ®) iyaziwa ngokumelana ne-oxidation ephezulu kumaqondo aphezulu. Le propati igqwesileyo inxulumene nokwakheka isikali thermodynamically uzinzile alumina kumphezulu, nto leyo ikhusela imathiriyeli ngokuchasene oxidation ngakumbi [1]. Ngaphandle kweempawu ezixhaphakileyo zokumelana ne-corrosion, ixesha lokuphila lamacandelo enziwe kwi-FeCrAl-based alloys inokulinganiselwa ukuba iinxalenye zihlala zisesichengeni sokuhamba ngebhayisikile eshushu kumaqondo obushushu aphezulu [2]. Esinye sezizathu zoku kukuba isikali sokwenza isikali, i-aluminium, idliwe kwi-matrix ye-alloy kwindawo engaphantsi komhlaba ngenxa yokuqhekeka okuphindaphindiweyo kwe-thermo-shock kunye nokuguqulwa kwesikali se-alumina. Ukuba umxholo we-aluminium oseleyo uyancipha ngaphantsi koxinzelelo olubalulekileyo, i-alloy ayinakuphinda iguqule isikali sokukhusela, okubangele i-oxidation ye-catastrophic breakaway ngokusekwa kwe-iron-based based based and chromium-based oxides [3,4] ekhula ngokukhawuleza. Ngokuxhomekeke kwi-atmosfera ejikelezileyo kunye nokunyanzeliswa kweeoksidi zomphezulu oku kungaququzelela ngakumbi i-oxidation yangaphakathi okanye i-nitridation kunye nokwakhiwa kwezigaba ezingafunekiyo kummandla ongaphantsi komhlaba [5]. U-Han no-Young baye babonisa ukuba kwisikali se-alumina esenza i-Ni Cr Al alloys, ipateni eyinkimbinkimbi ye-oxidation yangaphakathi kunye ne-nitridation ikhula [6,7] ngexesha lokuhamba ngebhayisikile eshushu kumaqondo obushushu aphezulu kwi-atmosphere yomoya, ngakumbi kwii-alloys eziqulethe i-nitride eqinile efana ne-Al. kunye noTi [4]. Izikali ze-Chromium oxide ziyaziwa ngokuba yi-nitrogen ekwazi ukungena, kwaye i-Cr2 N iifom mhlawumbi njenge-sub-scale layer okanye njenge-precipitate yangaphakathi [8,9]. Esi siphumo sinokulindeleka ukuba sibe sibi ngakumbi phantsi kweemeko zebhayisikile ezishushu ezikhokelela ekuqhekekeni kwesikali se-oxide kunye nokunciphisa ukusebenza kwayo njengomqobo kwi-nitrogen [6]. Ukuziphatha kwe-corrosion kulawulwa lukhuphiswano phakathi kwe-oxidation, ekhokelela ekubunjweni kwe-alumina ekhuselayo / ukugcinwa, kunye nokungena kwe-nitrogen ekhokelela kwi-nitridation yangaphakathi ye-matrix ye-alloy ngokuqulunqwa kwesigaba se-AlN [6,10], esikhokelela kwi-spallation of loo mmandla ngenxa yokwandiswa kwe-thermal ephezulu yesigaba se-AlN xa kuthelekiswa ne-matrix ye-alloy [9]. Xa ubeka i-FeCrAl alloys kumaqondo obushushu aphezulu kwi-atmosphere eneoksijini okanye abanye abanikeli beoksijini njenge-H2O okanye i-CO2, i-oxidation yindlela yokusabela elawulayo, kunye neefom ze-alumina scale, ezingenakungena kwi-oksijini okanye i-nitrogen kumaqondo obushushu aphakamileyo kwaye zibonelela ngokhuseleko ekungeneni kwabo kwi-oxygen. ingxubevange matrix. Kodwa, ukuba ibonakaliswe kumoya wokunciphisa (i-N2 + H2), kunye nokuqhekeka kwe-alumina ekhuselayo, i-oxidation ye-breakaway yendawo iqala ngokusekwa kwe-non-protector Cr kunye ne-Ferich oxides, ebonelela ngendlela efanelekileyo yokusasazwa kwe-nitrogen kwi-matrix ye-ferritic kunye nokwakheka. yesigaba se-AlN [9]. Ukhuseleko (4.6) umoya we-nitrogen usetyenziswa rhoqo kwi-industrial application ye-FeCrAl alloys. Umzekelo, izifudumezi ezixhathisayo kwiziko zonyango lobushushu ezinomoya okhuselayo wenitrogen ngumzekelo wokusetyenziswa ngokubanzi kweealloyi ze-FeCrAl kwindawo enjalo. Ababhali baxela ukuba ireyithi ye-oxidation yee-alloys ze-FeCrAlY icotha kakhulu xa i-anneal kwiatmosfera ene-oxygen ephantsi yoxinzelelo oluyinxenye [11]. Injongo yophononongo yayikukufumanisa ukuba i-annealing kwi (99.996%) i-nitrogen (4.6) igesi (i-Messer® spec. inqanaba lokungahlambuluki i-O2 + H2O <10 ppm) ichaphazela ukuxhathisa ukubola kwe-FeCrAl alloy (Kanthal AF) kunye nokuba kuxhomekeke kangakanani. kwiqondo lokushisa le-annealing, ukuhluka kwayo (i-thermal-cycling), kunye nezinga lokufudumeza.