Kanthal AF alloy 837 resistohm alchrome Y fecral alloy

Kanthal AF is a ferritic iron-chromium-aluminium alloy (FeCrAl alloy) inoshandiswa patembiricha inosvika 1300°C (2370°F). Iyo alloy inoratidzirwa neakanakisa oxidation kuramba uye yakanaka kwazvo fomu kugadzikana zvichikonzera hupenyu hurefu hwezvinhu.

Kan-thal AF inowanzo shandiswa mumagetsi ekudziya zvinhu muchoto cheindasitiri nemidziyo yemumba.

Muenzaniso wezvishandiso muindasitiri yezvishandiso zviri mune yakavhurika mica zvinhu zvema toasters, zvekuomesa bvudzi, mune meander akaumbwa zvinhu zvemafan heaters uye seyakavhurika coil zvinhu pane fiber insulating zvinhu muceramic girazi repamusoro hita mumisara, mune ceramic hita yekubika ndiro, makoiri. pane yakaumbwa ceramic fiber yekubikira ndiro dzine ceramic hobs, mune yakamiswa coil zvinhu zvema fan heaters, mune yakamiswa yakatwasuka waya zvinhu zveradiator, convection heaters, mune porcupine zvinhu zvemhepo inopisa pfuti, radiator, tumble dryer.

Abstract Muchidzidzo chemazuva ano, iyo corrosion mechanism yekutengeserana FeCrAl alloy (Kanthal AF) panguva yekuputira munitrogen gasi (4.6) pa900 ° C uye 1200 ° C inotsanangurwa. Isothermal uye thermo-cyclic bvunzo ine dzakasiyana siyana nguva yekuratidzwa, mitengo yekudziya, uye tembiricha yekudziya yakaitwa. Oxidation bvunzo mumhepo uye nitrogen gasi yakaitwa ne thermogravimetric ongororo. Iyo microstructure inoratidzwa nekuongorora electron microscopy (SEM-EDX), Auger electron spectroscopy (AES), uye yakatarisa ion beam (FIB-EDX) kuongorora. Mhedzisiro yacho inoratidza kuti kufambira mberi kwekuora kunoitika kuburikidza nekuumbwa kwenzvimbo dzepasi pevhu nitridation matunhu, anoumbwa neAlN phase particles, izvo zvinoderedza kuita kwealuminium uye kukonzeresa kuputika uye spallation. Maitiro eAl-nitride kuumbwa uye Al-oxide chiyero kukura zvinoenderana neannealing tembiricha uye mwero wekupisa. Zvakaonekwa kuti nitridation yeFeCrAl alloy inzira inokurumidza kupfuura oxidation panguva yekuputira munitrogen gasi ine yakaderera okisijeni chikamu chekumanikidza uye inomiririra chikonzero chikuru chekuora kwealloy.

Nhanganyaya FeCrAl - based alloys (Kanthal AF ®) inonyanyo zivikanwa nekunyanya kupikisa oxidation patembiricha dzakakwirira. Ichi chivakwa chakanakisa chine chekuita nekuumbwa kweiyo thermodynamically yakagadzikana alumina sikeri pamusoro, iyo inodzivirira iyo zvinhu kubva kune imwe oxidation [1]. Pasinei nepamusoro-soro yekudzivirira zvivakwa, hupenyu hwezvinhu zvinogadzirwa kubva kuFeCrAl-based alloys hunogona kudzikiswa kana zvikamu zvacho zvichigara zvichiratidzwa kubhasikoro rinopisa patembiricha yakakwira [2]. Chimwe chezvikonzero zveizvi ndechekuti chiyero chekugadzira chinhu, aruminiyamu, inopedzwa mune alloy matrix munzvimbo yepasi nekuda kwekudzokororwa kwe thermo-shock kupaza uye kugadzirisa kwealumina scale. Kana iyo aruminiyamu yakasara yemukati inoderera pasi peyakanyanya kukosha, iyo alloy haichakwanisa kushandura chiyero chekudzivirira, zvichikonzera njodzi inoparadza oxidation nekuumbwa kwekukurumidza kukura iron-based uye chromium-based oxides [3,4]. Zvichienderana nemhepo yakatenderedza uye kupera kwemaokisi epamusoro izvi zvinogona kufambisa imwe oxidation yemukati kana nitridation uye kuumbwa kwezvikamu zvisingadiwi munzvimbo yepasi pevhu [5]. Han naVadiki vakaratidza kuti mualumina chiyero ichigadzira Ni Cr Al alloys, chimiro chakaoma chemukati oxidation uye nitridation inokura [6,7] panguva yekupisa bhasikoro pakupisa kwakanyanya mumhepo yemhepo, kunyanya mumaalloys ane akasimba nitride ekare seAl. uye Ti [4]. Chromium oxide zviyero zvinozivikanwa kuva nitrogen permeable, uye Cr2 N inoumba ingave diki-scale layer kana semukati memvura [8,9]. Mhedzisiro iyi inogona kutarisirwa kuve yakanyanya kuomarara pasi pemamiriro ekupisa bhasikoro izvo zvinotungamira kune oxide scale kuparuka uye kuderedza kushanda kwayo sechipingamupinyi kune nitrogen [6]. Iyo corrosion maitiro saka inodzorwa nemakwikwi pakati pe oxidation, iyo inotungamirira kune inodzivirira alumina kugadzirwa / kuchengetedza, uye nitrogen ingress inotungamirira mukati me nitridation ye alloy matrix nekuumbwa kweAlN phase [6,10], iyo inotungamirira kupararira kwe iyo dunhu nekuda kwekuwedzera kwemafuta ekuwedzera kweAlN chikamu kana ichienzaniswa neiyo alloy matrix [9]. Kana uchifumura maFeCrAl alloys kune tembiricha yakakwira mumhepo ine okisijeni kana vamwe vanopa okisijeni senge H2O kana CO2, oxidation ndiyo inotonga maitiro, uye mafomu ealuminium zviyero, izvo zvisingapindike kune okisijeni kana nitrogen pakudziya kwakakwira uye inopa dziviriro kubva mukupindira kwavo mumhepo. alloy matrix. Asi, kana yakavhenekerwa nemhepo yekudzikisa (N2 + H2), uye inodzivirira alumina chiyero chinotsemuka, oxidation yemunharaunda inoputika inotanga nekuumbwa kweasina kudzivirira Cr uye Ferich oxides, iyo inopa nzira yakanaka yekupararira kwenitrogen mune ferritic matrix uye kuumbwa. yeAlN chikamu [9]. Iyo inodzivirira (4.6) nitrogen mamiriro ekunze anogara achishandiswa muindasitiri yekushandiswa kweFeCrAl alloys. Semuyenzaniso, mahita ekupisa mumavira ekupisa ane inodzivirira nitrogen mhepo muenzaniso wekushandiswa kwakapararira kweFeCrAl alloys munzvimbo yakadai. Vanyori vanotaura kuti chiyero cheoxidation yeFeCrAlY alloys inononoka zvakanyanya kana ichinyura mumhepo ine yakaderera okisijeni chikamu chekumanikidza [11]. Chinangwa chechidzidzo chacho chaiva chekuona kana annealing mu (99.996%) nitrogen (4.6) gasi (Messer® spec. kusachena kwemazinga O2 + H2O <10 ppm) inokanganisa corrosion resistance yeFeCrAl alloy (Kanthal AF) uye kusvika pamwero wakadii. pane annealing tembiricha, kusiyanisa kwayo (thermal-cycling), uye mwero wekupisa.