Kev sib xyaw ua ke ntawm cov hlau nquag

1. Cov khoom siv sib txhuam

(1) Titanium thiab nws cov hlau sib xyaw ua ke tsis tshua muaj brazed nrog cov solder mos. Cov hlau sib xyaw ua ke siv rau brazing feem ntau suav nrog cov nyiaj puag, txhuas puag, titanium puag lossis titanium zirconium puag.

Cov hlau nplaum uas siv nyiaj feem ntau yog siv rau cov khoom uas muaj qhov kub ua haujlwm tsawg dua 540 ℃. Cov pob qij txha uas siv cov hlau nplaum ntshiab muaj zog tsawg, yooj yim tawg, thiab tsis zoo tiv taus corrosion thiab oxidation. Qhov kub brazing ntawm Ag Cu hlau nplaum qis dua li ntawm nyiaj, tab sis qhov wettability txo qis nrog qhov nce ntawm Cu cov ntsiab lus. Cov hlau nplaum Ag Cu uas muaj me ntsis Li tuaj yeem txhim kho qhov wettability thiab qib alloying ntawm cov hlau nplaum thiab cov hlau hauv paus. AG Li hlau nplaum muaj cov yam ntxwv ntawm qhov melting qis thiab muaj zog reducibility. Nws yog qhov tsim nyog rau brazing titanium thiab titanium alloys hauv huab cua tiv thaiv. Txawm li cas los xij, brazing nqus tsev yuav ua rau lub cub tawg vim Li evaporation. Ag-5al- (0.5 ~ 1.0) Mn filler hlau yog cov hlau filler nyiam rau cov khoom titanium alloy nyias-walled. Cov pob qij txha brazed muaj oxidation zoo thiab corrosion tsis kam. Lub zog shear ntawm titanium thiab titanium alloy pob qij txha brazed nrog cov hlau hauv paus filler hlau yog qhia nyob rau hauv Rooj 12.

Rooj 12 Cov txheej txheem brazing thiab lub zog sib koom ua ke ntawm titanium thiab titanium alloys

Qhov kub ntawm cov hlau txhuas ua los ntawm cov hlau nplaum yog qis, uas yuav tsis ua rau muaj titanium alloy β. Kev hloov pauv theem txo qhov yuav tsum tau xaiv cov khoom siv thiab cov qauv ntawm cov khoom siv brazing. Kev sib cuam tshuam ntawm cov hlau filler thiab cov hlau puag yog qis, thiab kev yaj thiab kev sib kis tsis pom tseeb, tab sis qhov plasticity ntawm cov hlau filler yog qhov zoo, thiab nws yooj yim rau dov cov hlau filler thiab cov hlau puag ua ke, yog li nws tsim nyog heev rau kev brazing titanium alloy radiator, honeycomb qauv thiab laminate qauv.

Cov titanium raws li lossis titanium zirconium raws li fluxes feem ntau muaj Cu, Ni thiab lwm yam ntsiab lus, uas tuaj yeem sai sai rau hauv matrix thiab cuam tshuam nrog titanium thaum lub sijhawm brazing, ua rau matrix corrosion thiab tsim cov txheej brittle. Yog li ntawd, qhov kub brazing thiab lub sijhawm tuav yuav tsum tau tswj hwm nruj me ntsis thaum lub sijhawm brazing, thiab yuav tsum tsis txhob siv rau brazing ntawm cov qauv nyias-phab ntsa kom deb li deb tau. B-ti48zr48be yog ib qho Ti Zr solder ib txwm muaj. Nws muaj qhov zoo wettability rau titanium, thiab cov hlau hauv paus tsis muaj kev nyiam ntawm kev loj hlob ntawm cov noob thaum lub sijhawm brazing.

(2) Brazing filler hlau rau zirconium thiab cov hlau alloys puag brazing ntawm zirconium thiab cov hlau alloys puag feem ntau suav nrog b-zr50ag50, b-zr76sn24, b-zr95be5, thiab lwm yam, uas yog siv dav hauv brazing ntawm zirconium alloy kav dej ntawm nuclear fais fab reactors.

(3) Cov kua hluav taws xob brazing thiab cov huab cua tiv thaiv titanium, zirconium thiab cov hlau puag tuaj yeem tau txais cov txiaj ntsig zoo hauv lub tshuab nqus tsev thiab huab cua inert (helium thiab argon). Yuav tsum siv cov argon purity siab rau argon shielded brazing, thiab qhov dew point yuav tsum yog -54 ℃ lossis qis dua. Cov kua hluav taws xob tshwj xeeb uas muaj fluoride thiab chloride ntawm hlau Na, K thiab Li yuav tsum siv rau nplaim taws brazing.

2. Kev siv tshuab txhuam

Ua ntej yuav siv brazing, qhov chaw yuav tsum tau ntxuav kom huv si, tshem cov roj thiab tshem tawm cov zaj duab xis oxide. Cov zaj duab xis oxide tuab yuav tsum tau tshem tawm los ntawm kev siv tshuab, kev siv xuab zeb blasting lossis kev siv dej ntsev molten. Cov zaj duab xis oxide nyias tuaj yeem raug tshem tawm hauv cov tshuaj uas muaj 20% ~ 40% nitric acid thiab 2% hydrofluoric acid.

Ti, Zr thiab lawv cov alloys tsis raug tso cai kom kov qhov sib koom ua ke nrog huab cua thaum lub sijhawm brazing cua sov. Brazing tuaj yeem ua tiav hauv qab kev tiv thaiv ntawm lub tshuab nqus tsev lossis roj inert. Kev cua sov induction zaus siab lossis cua sov hauv kev tiv thaiv tuaj yeem siv. Kev cua sov induction yog txoj hauv kev zoo tshaj plaws rau cov khoom me me symmetrical, thaum brazing hauv lub cub tawg yog qhov zoo dua rau cov khoom loj thiab nyuaj.

Yuav tsum xaiv Ni Cr, W, Mo, Ta thiab lwm yam khoom siv ua cov khoom siv cua sov rau kev sib xyaw Ti, Zr thiab lawv cov hlau sib xyaw. Cov khoom siv uas muaj graphite raug tso tawm ua cov khoom siv cua sov yuav tsum tsis txhob siv kom tsis txhob muaj kuab paug rau cov pa roj carbon. Cov khoom siv sib xyaw yuav tsum ua los ntawm cov khoom siv uas muaj zog kub zoo, cov coefficient nthuav dav thermal zoo ib yam li Ti lossis Zr, thiab tsis tshua muaj kev cuam tshuam nrog cov hlau hauv paus.