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 kwimica yeethowusta, izomisi zeenwele, kwizinto ezinobume be-meander kwizifudumezi zefeni kwaye njengezinto ezivulekileyo zekhoyili kwifiber insulating imathiriyeli kwiglasi yeceramic izifudumezi eziphezulu kwimiyinge, kwizifudumezi zeceramic zokubilisa iipleyiti, iikhoyili kwifayibha ebunjiweyo yeceramic yokupheka iipleyiti ezine-ceramic hobs, kwi-coil enqunyanyisiweyo kwizifudumezi ezinqamlezileyo, izakhi ze-coil ezinqunyelweyo kwizifudumezi ezinqamlezileyo, izinto ezixhonywe kwi-coil kwizifudumezi ezinqamlezileyo. izinto zeporcupine zemipu yomoya oshushu, iiradiyetha, izixhobo zokomisa.

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 aphakamileyo kwi-atmosphere yomoya, ngakumbi kwii-alloys eziqulethe i-nitride yangaphambili eqinile njenge-Al kunye ne-Ti [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 ngokukhuphisana phakathi kwe-oxidation, ekhokelela ekubunjweni kwe-alumina yokukhusela / ukugcinwa, kunye nokungena kwe-nitrogen ekhokelela kwi-nitridation yangaphakathi ye-matrix ye-alloy ngokuqulunqwa kwesigaba se-AlN [6,10], esikhokelela ekusasazeni loo mmandla ngenxa yokwandiswa kwe-thermal ephezulu yesigaba se-AlN xa kuthelekiswa ne-alloy matrix [9]. Xa uveza ama-alloys e-FeCrAl kumaqondo okushisa aphezulu kwi-atmospheres kunye ne-oksijini okanye abanye abaxhasi be-oksijini njenge-H2O okanye i-CO2, i-oxidation yindlela yokusabela elawulayo, kunye neefom ze-alumina scale, ezingenakungena kwi-oksijini okanye i-nitrogen kumaqondo okushisa aphakamileyo kwaye inikeze ukhuseleko ekungeneni kwabo kwi-matrix ye-alloy. 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 nokwakhiwa kwesigaba 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 yophando yayikukufumanisa ukuba i-annealing kwi-(99.996%) i-nitrogen (4.6) igesi (i-Messer® spec. inqanaba lokungahlambuluki i-O2 + H2O <10 ppm) ichaphazela ukuxhathisa kwe-corrosion ye-FeCrAl alloy (Kanthal AF) kunye nokuba kuxhomekeke kangakanani kwiqondo lokushisa, ukuguquguquka kwayo, kunye nokufudumala kwe-thermal.