Kupisa kweSuperalloys
(1) Brazing maitiro superalloys anogona kukamurwa muzvikamu zvitatu: nickel base, iron base uye cobalt base.Ivo vane yakanaka mechanical properties, oxidation resistance uye corrosion resistance pane tembiricha yakakwira.Nickel base alloy ndiyo inonyanya kushandiswa mukugadzirwa kwekuita.
Iyo superalloy ine yakawanda Cr, uye Cr2O3 oxide firimu iyo yakaoma kubvisa inoumbwa pamusoro panguva yekupisa.Nickel base superalloys ine Al uye Ti, iyo iri nyore kuisa oxidize kana yapiswa.Naizvozvo, kudzivirira kana kuderedza oxidation ye superalloys panguva yekupisa uye kubvisa iyo oxide firimu ndiro dambudziko rekutanga panguva yekubhuroka.Sezvo borax kana boric asidhi mu flux inogona kukonzera kuparara kwesimbi yepasi pakupisa kwebrazing, iyo boron inonaya mushure mekuita kwayo inogona kupinda mukati mesimbi yepasi, zvichikonzera kupinda mukati megranular.Kune yakakandwa nickel base alloys ane yakakwira Al uye Ti zviri mukati, iyo vacuum dhigirii munzvimbo inopisa haifanirwe kuve isingasviki 10-2 ~ 10-3pa panguva yebrazing kudzivirira oxidation pane alloy pamusoro panguva yekupisa.
Kune mhinduro yakasimbiswa uye kunaya kwakasimbisa nickel base alloys, tembiricha yebrazing inofanirwa kuenderana nekupisa kwekupisa kwemhinduro yekurapa kuve nechokwadi chekupera kuzere kwezvinhu zvealloy.Iyo tembiricha yekudziya yakadzikira, uye alloy zvinhu hazvigone kunyungudika zvachose;Kana kupisa kwekupisa kwakanyanyisa, nheyo yesimbi yezviyo ichakura, uye zvinhu zvezvinhu hazvizodzoserwe kunyange mushure mekupisa kupisa.Iyo yakasimba mhinduro tembiricha ye cast base alloys yakakwira, iyo kazhinji isingakanganise zvinhu zvemukati nekuda kwekunyanya kupisa kwekupisa.
Mamwe nickel base superalloys, kunyanya kunaya kwakasimbisa maalloys, ane tsika yekunetsekana kupaza.Usati wanyura, kushushikana kwakaumbwa mukuita kunofanirwa kubviswa zvizere, uye kushushikana kwekushisa kunofanira kuderedzwa panguva yekubhuroka.
(2) Brazing material nickel base alloy inogona kuvezwa nesirivha base, yakachena mhangura, nickel base uye inoshanda solder.Kana tembiricha yekushanda yejoinhi isiri yakakwirira, sirivheri yakavakirwa zvinhu inogona kushandiswa.Kune marudzi akawanda esirivha based solders.Kuti uderedze kushushikana kwemukati panguva yekupisa kupisa, zviri nani kusarudza solder nekushisa kwakadzika kunyungudika.Fb101 flux inogona kushandiswa kubhuroka nesirivha base yekuzadza simbi.Fb102 flux inoshandiswa kubrazing precipitation yakasimbiswa superalloy ine yakanyanya aluminium yemukati, uye 10% ~ 20% sodium silicate kana aluminium flux (senge fb201) inowedzerwa.Kana tembiricha yebrazing ichipfuura 900 ℃, fb105 flux ichasarudzwa.
Paunenge uchibhuroka muvacuum kana yekudzivirira mamiriro ekunze, mhangura yakachena inogona kushandiswa sebrazing filler simbi.Iyo tembiricha yekudziya ndeye 1100 ~ 1150 ℃, uye iyo yakabatana haiburitse kushushikana, asi tembiricha yekushanda haifaniri kudarika 400 ℃.
Nickel base brazing filler simbi ndiyo inonyanya kushandiswa brazing filler simbi muSuperalloys nekuda kwekuita kwayo kwakanaka kwekushisa kwepamusoro uye hapana kunetseka kupaza panguva yekubhuroka.Iwo makuru alloy element mu nickel base solder ndeye Cr, Si, B, uye shoma shoma ye solder ine Fe, W, nezvimwe. yeB mu base simbi uye kuwedzera kunyungudika tembiricha nguva.Iyo brazing filler simbi yekushongedza yakakwirira-tembiricha yekushanda zvikamu uye turbine blades.Nekudaro, iyo fluidity yeW-ine solder inowedzera uye gaka remajoini rakaoma kudzora.
Iyo inoshanda diffusion brazing filler simbi haina Si element uye ine yakanakisa oxidation kuramba uye vulcanization kuramba.Iyo tembiricha yekudziya inogona kusarudzwa kubva 1150 ℃ kusvika 1218 ℃ zvichienderana nerudzi rwe solder.Mushure mekubhuroka, iyo brazed yekubatanidza ine zvimiro zvakafanana nesimbi yepasi inogona kuwanikwa mushure me1066 ℃ kurapwa kwekupararira.
(3) Brazing process nickel base alloy inogona kutora brazing mune inodzivirira mamiriro evira, vacuum brazing uye yenguva pfupi yemvura chikamu chekubatanidza.Usati wabhuroka, nzvimbo yacho inofanirwa kunge yakadzikiswa uye okisidhi yabviswa nekuporiswa kwesandpaper, kupururudzwa kwemavhiri, kukweshwa kweacetone uye kuchenesa makemikari.Paunosarudza brazing process parameters, zvinofanirwa kucherechedzwa kuti tembiricha yekudziya haifanire kunge yakanyanya kukwirira uye nguva yekubhuroka inofanirwa kunge iri pfupi kuti udzivise kusimba kwemakemikari kuita pakati pekuyerera nesimbi yepasi.Kuti udzivise simbi yepasi kubva pakutsemuka, iyo inotonhora yakagadziridzwa zvikamu zvichange zvarerukirwa zvisati zvavekupisa, uye kupisa kwewelding kuchave kwakafanana sezvinobvira.For precipitation akasimbisa superalloys, zvikamu zvichava pasi yakasimba mhinduro kurapwa kutanga, ipapo brazed panguva tembiricha yakakwira zvishoma pane kuchembera kusimbisa kurapa, uye pakupedzisira kuchembera kurapwa.
1) Kupisa mumhepo inodzivirira yevira yekubatidza mune inodzivirira mamiriro evira inoda kuchena kwakanyanya kwekudzivirira gasi.Kune ma superalloys ane w (AL) uye w (TI) asingasviki 0.5%, dova rinenge riri pasi pe -54 ℃ kana hydrogen kana argon inoshandiswa.Kana zvirimo zveAl naTi zvichiwedzera, iyo alloy surface ichiri oxidize kana yapisa.Matanho anotevera anofanira kutorwa;Wedzera zvishoma zvishoma (zvakadai sefb105) uye bvisa iyo oxide film ine flux;0.025 ~ 0.038mm gobvu coating yakaiswa pamusoro pezvikamu;Pfaya solder pamusoro pezvinhu kuti zvigadziriswe mberi;Wedzera huwandu hudiki hwegasi flux, senge boron trifluoride.
2) Vacuum brazing vacuum brazing inoshandiswa zvakanyanya kuwana zvirinani kudzivirira maitiro uye brazing mhando.Ona tafura 15 yezvimisikidzwa zveyakajairwa nickel base superalloy majoini.Kune ma superalloys ane w (AL) uye w (TI) asingasviki 4%, zviri nani kuti electroplate layer ye 0.01 ~ 0.015mm nickel pamusoro, kunyangwe kunyorova kwe solder kunogona kuve nechokwadi pasina pretreatment yakakosha.Kana w (AL) uye w (TI) ichipfuura 4%, ukobvu hwenickel coating huchave 0.020.03mm.Kunyanya kutetepa kupfava hakuna kudzivirira, uye yakawandisa coating inoderedza kusimba kwejoinhi.Zvikamu zvinosungirirwa zvinogonawo kuiswa mubhokisi revacuum brazing.Bhokisi racho rinofanira kuzadzwa negetter.Semuenzaniso, Zr inotora gasi pakupisa kwepamusoro, iyo inogona kuumba nzvimbo yekutsvaira mubhokisi, nokudaro kudzivirira oxidation yealloy surface.
Tafura gumi neshanu zvivakwa zveVacuum Brazed Joints yeyakajairwa nickel base superalloys
Iyo microstructure uye simba reiyo brazed joint yeSuperalloy shanduko neiyo brazing gap, uye iyo yekupararira kurapwa mushure mekubhuroka kuchawedzera kuwedzera kunobvumidzwa kukosha kweiyo gap.Kutora Inconel alloy semuenzaniso, iyo gap yakakura yeInconel joint brazed ne b-ni82crsib inogona kusvika 90um mushure mekupararira kurapwa pa1000 ℃ ye1H;Nekudaro, kune majoini akaiswa braze ne b-ni71crsib, iyo gap yakakura ndeye 50um mushure mekurapwa kwekupararira pa1000 ℃ ye1H.
3) Yenguva pfupi yemvura yekubatanidza chikamu chemvura chikamu chekubatanidza inoshandisa iyo interlayer alloy (inenge 2.5 ~ 100um gobvu) ine nzvimbo yekunyungudika yakadzikira pane base simbi sesimbi yekuzadza.Pasi pekumanikidzwa kudiki (0 ~ 0.007mpa) uye tembiricha yakakodzera (1100 ~ 1250 ℃), iyo interlayer zvinhu inotanga kunyunguduka uye inonyorovesa hwaro simbi.Nekuda kwekukurumidza kupararira kwezvinhu, isothermal solidification inoitika pajoinhi kuti iite kubatana.Iyi nzira inoderedza zvakanyanya kuenderana zvinodiwa zvepasi simbi pamusoro uye inoderedza welding pressure.Iwo makuru ma paramita enguva pfupi yemvura chikamu chekubatanidza kudzvanywa, tembiricha, kubata nguva uye kuumbwa kwe interlayer.Isa dhiri shoma kuti uchengetedze nzvimbo yekubatanidza ye weldment mukubata kwakanaka.Kupisa kwekushisa uye nguva zvine simba guru pakushanda kwejoini.Kana iyo joini ichidikanwa kuti ive yakasimba sesimbi yepasi uye isingakanganise kushanda kwesimbi yepasi, iyo yekubatanidza maitiro paramita yekupisa kwakanyanya (senge ≥ 1150 ℃) uye nguva refu (yakadai se8 ~ 24h) ichave. adopted;Kana iyo yekubatanidza mhando yejoinhi yakaderedzwa kana simbi yepasi haigone kumira kutonhora kwakanyanya, tembiricha yakaderera (1100 ~ 1150 ℃) uye nguva pfupi (1 ~ 8h) ichashandiswa.Iyo yepakati dhizaini inotora yakabatana base simbi kuumbwa seyakanyanya kuumbwa, uye kuwedzera akasiyana kutonhora zvinhu, senge B, Si, Mn, Nb, etc. Semuenzaniso, kuumbwa kweUdimet alloy ndeye ni-15cr-18.5co-4.3. al-3.3ti-5mo, uye kuumbwa kweyepakati layer yenguva pfupi yemvura yekubatanidza chikamu ndeye b-ni62.5cr15co15mo5b2.5.Zvese izvi zvinhu zvinogona kuderedza tembiricha yekunyungudika yeNi Cr kana Ni Cr Co alloys kusvika pasi, asi mhedzisiro yeB ndiyo inonyanya kuoneka.Uye zvakare, iyo yakanyanya kupararira mwero weB inogona kukurumidza kuita homogenize iyo interlayer alloy uye base simbi.
Nguva yekutumira: Jun-13-2022