Kanthal AF alloy 837 resistohm alchrome Y fecral alloy

Kanthal AF bụ iron-chromium-aluminium alloy (FeCrAl alloy) maka ojiji na okpomọkụ ruo 1300°C (2370°F). The alloy e ji mara mma ọxịdashọn nguzogide na nnọọ mma ụdị kwụsie ike na-akpata ogologo mmewere ndụ.

A na-ejikarị Kan-thal AF eme ihe na ọkụ eletrik n'ime ọkụ ụlọ ọrụ na ngwa ụlọ.

Ihe atụ nke ngwa dị na ụlọ ọrụ ngwa bụ na ihe ndị na-emeghe mica maka toasters, ndị na-ehicha ntutu, na ihe ndị na-emepụta ihe maka ndị na-ekpo ọkụ fan yana dị ka ihe na-emepe emepe na eriri mkpuchi ihe na seramiiki iko top heaters na ranges, na seramiiki heaters maka esi efere, coils. na eriri seramiiki a kpụrụ akpụ maka efere esi nri na hobs seramiiki, n'ime ihe mkpuchi mkpuchi a kwụsịrị maka ndị na-ekpo ọkụ fan, na ihe ndị kwụsiri ike na waya maka radiators, ndị na-ekpo ọkụ convection, na ihe anụ ezi maka egbe ikuku na-ekpo ọkụ, radiators, ọkpọ nkụ.

Abstract N'ime ọmụmụ ihe ugbu a, a kọwapụtara usoro corrosion nke azụmahịa FeCrAl alloy (Kanhal AF) n'oge annealing na nitrogen gas (4.6) na 900 Celsius C na 1200 Celsius C. A na-eme ule Isothermal na thermo-cyclic nwere oge mkpughe dị iche iche, ọnụego ikpo ọkụ, na okpomọkụ na-ekpo ọkụ. Emere ule oxidation na ikuku ikuku na nitrogen site na nyocha thermogravimetric. Ihe e ji mara microstructure bụ site na nyocha eletrọn microscopy (SEM-EDX), Auger electron spectroscopy (AES), na nyocha ion beam (FIB-EDX). Nsonaazụ na-egosi na ọganihu nke corrosion na-ewere ọnọdụ site na nhazi mpaghara nitridation subsurface nke dị n'okpuru ala, nke mejupụtara akụkụ nke AlN, nke na-ebelata ọrụ aluminom ma na-akpata embrittlement na spallation. Usoro nhazi nke Al-nitride na uto Al-oxide na-adabere na okpomọkụ na-ekpo ọkụ na ọnụego kpo oku. Achọpụtara na nitridation nke FeCrAl alloy bụ usoro ngwa ngwa karịa oxidation n'oge annealing na gas nitrogen nwere obere ikuku oxygen dị ala ma na-anọchite anya isi ihe na-akpata mbibi alloy.

Okwu Mmalite FeCrAl – alloys dabere (Kanhal AF ®) bụ onye amara nke ọma maka nguzogide oxidation ha dị elu na oke okpomọkụ. Ngwongwo a magburu onwe ya metụtara nguzobe nke alumina kwụsiri ike nke ọma n'elu, nke na-echebe ihe ahụ pụọ na oxidation ọzọ [1]. N'agbanyeghị ihe ndị na-eguzogide corrosion dị elu, oge ndụ ihe ndị a na-emepụta na FeCrAl- alloys nwere ike ịbelata ma ọ bụrụ na akụkụ ahụ na-emekarị ka ịgba ígwè na-ekpo ọkụ na okpomọkụ dị elu [2]. Otu n'ime ihe kpatara nke a bụ na a na-eri ihe na-emepụta ọnụ ọgụgụ, aluminum, na matrix alloy na mpaghara dị n'okpuru ala n'ihi mgbawa ọkụ na-ekpo ọkụ na-emegharị ugboro ugboro na nhazigharị nke alumina. Ọ bụrụ na ọdịnaya aluminom fọdụrụnụ na-agbada n'okpuru itinye uche dị oke egwu, alloy enweghịzi ike imezi nha nchekwa ahụ, na-ebute oxidation na-emebi emebi site n'ichepụta oxides nke sitere na ígwè na chromium na-eto ngwa ngwa [3,4]. Dabere na ikuku gburugburu na permeability nke elu oxides nke a nwere ike ịkwado oxidation ọzọ dị n'ime ma ọ bụ nitridation na nhazi usoro na-adịghị mma na mpaghara dị n'okpuru ala [5]. Han na Young egosila na n'ọtụtụ alumina na-akpụ Ni Cr Al alloys, usoro mgbagwoju anya nke oxidation na nitridation na-etolite [6,7] n'oge ịgba ígwè na-ekpo ọkụ na okpomọkụ dị elu na ikuku ikuku, karịsịa na alloys nke nwere nitride mbụ dị ka Al. na Ti [4]. A maara akpịrịkpa chromium oxide ka ọ bụrụ nitrogen permeable, na Cr2 N na-etolite ma ọ bụ dị ka oyi akwa ma ọ bụ dị ka mkpọda n'ime [8,9]. Enwere ike ịtụ anya na mmetụta a ga-akawanye njọ n'okpuru ọnọdụ ịgba ígwè na-ekpo ọkụ nke na-eduga n'ịgbawa ọnụ ọgụgụ oxide na ibelata irè ya dị ka ihe mgbochi na nitrogen [6]. A na-achịkwa omume mmebi ahụ site na asọmpi dị n'etiti oxidation, nke na-eduga n'ichebe alumina na-echebe / na-edozi ya, na ntinye nitrogen na-eduga n'ime nitridation nke matrix alloy site na nhazi nke AlN Phase [6,10], nke na-eduga na spallation nke mpaghara ahụ n'ihi mgbasawanye okpomọkụ dị elu nke oge AlN ma e jiri ya tụnyere alloy matrix [9]. Mgbe ikpughe FeCrAl alloys na okpomọkụ dị elu na ikuku na oxygen ma ọ bụ ndị na-enye oxygen ndị ọzọ dị ka H2O ma ọ bụ CO2, oxidation bụ mmeghachi omume na-achịkwa, na ụdị alumina, nke na-enweghị ike ịnweta oxygen ma ọ bụ nitrogen na okpomọkụ dị elu ma na-enye nchebe pụọ na ntinye ha n'ime ụlọ. alloy matrix. Mana, ọ bụrụ na ekpughere ya na ikuku mbelata (N2 + H2), yana mgbawa alumina na-echebe, oxidation mpaghara na-amalite site na nguzobe nke Cr na Ferich oxides na-abụghị nke na-echebe, nke na-enye ụzọ dị mma maka mgbasa nitrogen n'ime matrix ferritic na nguzobe. Usoro AlN [9]. A na-etinye ikuku nitrogen na-echebe (4.6) ugboro ugboro na ngwa nrụpụta nke FeCrAl alloys. Dịka ọmụmaatụ, ndị na-ekpo ọkụ na-eguzogide ọkụ na ọkụ ọgwụgwọ okpomọkụ nwere ikuku nitrogen na-echebe bụ ihe atụ nke ngwa FeCrAl alloys juru ebe niile na mpaghara dị otú ahụ. Ndị ode akwụkwọ na-akọ na ọnụ ọgụgụ oxidation nke alloys FeCrAlY na-eji nwayọ nwayọ mgbe ọ na-agbaze na ikuku nke nwere obere nrụgide akụkụ oxygen dị ala [11]. Ebumnuche nke ọmụmụ ahụ bụ iji chọpụta ma annealing na (99.996%) nitrogen (4.6) gas (Messer® spec. adịghị ọcha larịị O2 + H2O <10 ppm) na-emetụta corrosion resistance nke FeCrAl alloy (Kanhal AF) na ruo ókè ọ dabere. na annealing okpomọkụ, ya mgbanwe (thermal-cycling), na okpomọkụ ọnụego.