1. Izinto zokubopha
(1) I-Titanium kanye ne-base alloys yayo akuvamile ukugqunywa nge-solder ethambile. Izinsimbi zokugcwalisa i-brazing ezisetshenziselwa ukugquma zifaka phakathi isisekelo sesiliva, isisekelo se-aluminium, isisekelo se-titanium noma isisekelo se-titanium zirconium.
I-solder esekelwe esiliva isetshenziswa kakhulu ezingxenyeni ezinokushisa okusebenzayo okungaphansi kuka-540 ℃. Amajoyinti asebenzisa i-solder yesiliva emsulwa anamandla aphansi, kulula ukuwaqhekeza, kanye nokumelana nokugqwala okubi kanye nokumelana nokugqwala. Izinga lokushisa lokugqwala le-solder ye-Ag Cu liphansi kunelesiliva, kodwa ukumanzi kwehla ngokwanda kokuqukethwe kwe-Cu. I-solder ye-Ag Cu equkethe inani elincane le-Li ingathuthukisa ukumanzi kanye nezinga lokuhlanganisa phakathi kwe-solder kanye nensimbi eyisisekelo. I-solder ye-AG Li inezici zephuzu eliphansi lokuncibilika kanye nokuncishiswa okunamandla. Ifanelekela i-titanium ne-titanium alloys ezibandisiwe emoyeni ovikelayo. Kodwa-ke, i-vacuum brazing izongcolisa isithando ngenxa yokuhwamuka kwe-Li. I-Ag-5al- (0.5 ~ 1.0) Mn filler metal iyinsimbi ekhethwayo yokugcwalisa izingxenye ze-titanium alloy ezinezindonga ezincane. Ijoyinti eligobile linokumelana okuhle nokugqwala kwe-oxidation. Amandla okucheba amajoyinti e-titanium ne-titanium alloy aboshwe ngensimbi yesiliva eyisisekelo aboniswe kuThebula 12.
Ithebula 12 imingcele yenqubo yokubhoboza kanye namandla ahlangene e-titanium ne-titanium alloys
Izinga lokushisa lokushisisa le-aluminium based solder liphansi, okungeke kubangele ukwenzeka kokuguqulwa kwe-titanium alloy β Phase kunciphisa izidingo zokukhetha izinto zokwakha kanye nezakhiwo ze-brazing. Ukusebenzisana phakathi kwensimbi yokugcwalisa kanye nensimbi eyisisekelo kuphansi, futhi ukuncibilika kanye nokusabalalisa akubonakali, kodwa i-plasticity yensimbi yokugcwalisa ilungile, futhi kulula ukuyigoqa insimbi yokugcwalisa kanye nensimbi eyisisekelo ndawonye, ngakho-ke ifaneleka kakhulu kwi-radiator ye-titanium alloy brazing, isakhiwo se-honeycomb kanye nesakhiwo se-laminate.
Ama-fluxes asekelwe ku-titanium noma i-titanium zirconium ngokuvamile aqukethe i-Cu, i-Ni nezinye izakhi, ezingasakazeka ngokushesha ku-matrix futhi zisabela ne-titanium ngesikhathi sokushiswa, okuholela ekugqwaleni kwe-matrix kanye nokwakheka kwengqimba ebuthakathaka. Ngakho-ke, izinga lokushisa lokushiswa kanye nesikhathi sokubamba kufanele kulawulwe ngokuqinile ngesikhathi sokushiswa, futhi akufanele kusetshenziselwe ukushiswa kwezakhiwo ezinezindonga ezincane ngangokunokwenzeka. I-B-ti48zr48be iyi-solder ejwayelekile ye-Ti Zr. Iyakwazi ukumanzisa kahle i-titanium, futhi insimbi eyisisekelo ayinawo umkhuba wokukhula kokusanhlamvu ngesikhathi sokushiswa.
(2) Izinsimbi zokugcwalisa i-Brazing ze-zirconium kanye ne-base alloys I-brazing ye-zirconium kanye ne-base alloys ihlanganisa kakhulu i-b-zr50ag50, i-b-zr76sn24, i-b-zr95be5, njll., ezisetshenziswa kabanzi ekufakeni i-brazing yamapayipi e-zirconium alloy e-reactor yamandla enuzi.
(3) I-flux ye-brazing kanye ne-protective atmosphere titanium, zirconium kanye ne-base alloys zingathola imiphumela eyanelisayo emoyeni ongenalutho kanye nomoya ongenawo umoya (i-helium ne-argon). I-argon ehlanzekile kakhulu kufanele isetshenziselwe i-argon shielded brazing, futhi iphuzu lamazolo kumele libe ngu-54 ℃ noma ngaphansi. I-flux ekhethekile equkethe i-fluoride ne-chloride yensimbi i-Na, K kanye ne-Li kumele isetshenziselwe i-flame brazing.
2. Ubuchwepheshe be-brazing
Ngaphambi kokushiswa kwensimbi, indawo engaphezulu kumele ihlanzwe kahle, isuswe amafutha bese kususwa ifilimu ye-oxide. Ifilimu ye-oxide ejiyile kufanele isuswe ngendlela yemishini, indlela yokuqhumisa isihlabathi noma indlela yokugeza usawoti oncibilikisiwe. Ifilimu ye-oxide encane ingasuswa esixazululweni esiqukethe i-20% ~ 40% nitric acid kanye ne-2% hydrofluoric acid.
I-Ti, i-Zr kanye nama-alloy azo awavunyelwe ukuthinta indawo ehlangene nomoya ngesikhathi sokushisa kwe-brazing. I-brazing ingenziwa ngaphansi kokuvikelwa kwe-vacuum noma igesi engasebenzi. Ukushisa noma ukushisa kwe-induction okuvame kakhulu kungasetshenziswa. Ukushisa kwe-induction kuyindlela engcono kakhulu yezingxenye ezincane ezilinganayo, kuyilapho i-brazing esithandweni somlilo inenzuzo kakhulu ezingxenyeni ezinkulu neziyinkimbinkimbi.
I-Ni Cr, i-W, i-Mo, i-Ta nezinye izinto kufanele zikhethwe njengezinto zokushisa ze-brazing Ti, i-Zr kanye ne-alloys yazo. Imishini ene-graphite eveziwe njengezinto zokushisa akufanele isetshenziselwe ukugwema ukungcoliswa kwekhabhoni. I-brazing fixture kumele yenziwe ngezinto ezinamandla amahle okushisa okuphezulu, i-coefficient yokukhulisa ukushisa efanayo ne-Ti noma i-Zr, kanye ne-reactivity ephansi ngensimbi eyisisekelo.
Isikhathi sokuthunyelwe: Juni-13-2022