Qhov zoo tshaj plaws Brazing Method rau Titanium thiab Titanium Alloys

Titanium thiab nws cov alloys, uas yog tsim los ntawm cov ntsiab lus xws li hlau, txhuas, vanadium, thiab molybdenum, muaj cov khoom zoo ntawm lub cev thiab cov khoom siv xws li lub zog siab, siab kub tsis kam, thiab zoo corrosion kuj. Lawv tau dav siv nyob rau hauv high-tech teb xws li chemical engineering, marine engineering, tsheb thauj mus los, tshuaj, kev tsim kho, aerospace, thiab tub rog industries thiab yog ib qho tseem ceeb lub teeb yuag cov ntaub ntawv. Ntawm lawv, aerospace yog ib qho tseem ceeb hauv cheeb tsam daim ntawv thov.
Titanium thiab nws cov alloys yog reactive hlau thiab yog dav siv nyob rau hauv aerospace, petrochemical, thiab nuclear industries. Cov teeb meem tseem ceeb hauv brazing ntawm titanium thiab nws cov alloys yog raws li hauv qab no:
① Cov yeeb yaj kiab oxide ruaj khov rau ntawm qhov chaw. Titanium thiab nws cov alloys muaj kev sib raug zoo rau cov pa oxygen thiab yooj yim los tsim cov yeeb yaj kiab oxide ruaj khov rau ntawm qhov chaw, uas cuam tshuam cov ntub dej thiab sib kis ntawm cov khoom siv brazing. Yog li ntawd, nws yuav tsum tau muab tshem tawm thaum brazing.
② Muaj zog nqus cov pa roj. Titanium thiab nws cov alloys muaj ib tug nyiam nqus hydrogen, oxygen, thiab nitrogen thaum lub sij hawm cua sov txheej txheem, thiab qhov kub thiab txias, lub zog nqus, uas ua rau ib tug ntse txo nyob rau hauv lub plasticity thiab toughness ntawm titanium. Yog li ntawd, brazing yuav tsum tau nqa tawm nyob rau hauv lub tshuab nqus tsev los yog inert cua.
③ Ib qho yooj yim los tsim cov tshuaj sib xyaw ua ke. Titanium thiab nws cov alloys tuaj yeem hnov ​​​​mob nrog feem ntau cov ntaub ntawv brazing los tsim cov khoom sib txuas, ua rau cov pob qij txha ua nkig. Yog li, cov khoom siv brazing siv rau brazing lwm cov ntaub ntawv yog qhov yooj yim tsis haum rau brazing reactive hlau.
④ Cov qauv thiab cov khoom muaj kev hloov pauv. Titanium thiab nws cov alloys raug hloov pauv thiab cov nplej coarsening thaum cua sov. Qhov siab dua qhov kub, qhov hnyav dua qhov coarsening, yog li qhov kub ntawm qhov kub ntawm brazing yuav tsum tsis txhob siab dhau.
Hauv cov ntsiab lus, thaum brazing titanium thiab nws cov alloys, yuav tsum tau them nyiaj rau brazing cua sov kub. Feem ntau, lub brazing kub yuav tsum tsis txhob ntau tshaj 950-1000 degree , thiab qhov qis dua qhov brazing kub, qhov me me cuam tshuam rau cov khoom ntawm cov khoom siv hauv paus. Rau quenched thiab tempered alloys, brazing kuj tuaj yeem nqa tawm nyob rau hauv qhov xwm txheej tsis tshaj qhov kub ntawm kev laus.
Txhawm rau tiv thaiv oxidation thiab oxygen thiab hydrogen absorption tshwm sim hauv kev sib koom ua ke, titanium thiab titanium alloy brazing yog ua nyob rau hauv lub tshuab nqus tsev thiab inert cua thiab nplaim brazing feem ntau tsis siv. Thaum brazing nyob rau hauv lub tshuab nqus tsev los yog chlorine, high-frequency cua sov, lub cub tawg cua sov, thiab lwm yam yuav siv tau, uas muaj cua kub ceev ceev thiab lub sij hawm tuav luv luv, uas ua rau ib tug nyias txheej ntawm cov tebchaw nyob rau hauv lub interface cheeb tsam thiab zoo sib koom ua ke. Yog li ntawd, lub brazing kub thiab tuav lub sij hawm yuav tsum tau tswj kom cov khoom brazing ntws mus rau hauv qhov sib txawv.
Yog vim li cas vim li cas brazing titanium thiab nws cov alloys yog qhov zoo tshaj plaws nyob rau hauv lub tshuab nqus tsev thiab argon yog tias txawm hais tias titanium muaj ib tug loj affinity rau oxygen, nws muaj peev xwm tau ib tug du nto nyob rau hauv 13.3Pa nqus tsev vacuum vim lub dissolution ntawm oxide zaj duab xis nyob rau saum npoo.
Thaum brazing nyob rau hauv ib qho chaw argon thiab lub brazing kub ntau yog 760-927 degree, high-purity argon yuav tsum tau tiv thaiv titanium los ntawm discoloration. Feem ntau, cov kua argon nyob rau hauv cov thawv cia txias yog siv vim nws muaj purity siab.
Thaum brazing titanium thiab titanium alloys, brittle intermetallic compounds feem ntau tsim nyob rau hauv lub interface los yog nyob rau hauv lub brazing sib txawv, yog li txo qhov kev ua tau zoo ntawm lub brazed sib koom. Diffusion bonding tuaj yeem siv los txhim kho kev ua haujlwm ntawm kev sib koom ua ke ntawm brazed. Thaum lub sij hawm brazing, 50μm tuab tooj liab ntawv nyiaj, npib tsib xee ntawv nyiaj los yog nyiaj ntawv ci yog muab tso rau ntawm cov titanium alloys, uas feem ntau tsim Cu-Ti, Ni-Ti, thiab Ag-Ti eutectics los ntawm kev cia siab rau kev sib cuag ntawm titanium thiab cov hlau. Tom qab ntawd cov brittle intermetallic tebchaw yog diffused tawm. Lub diffusion-bonded sib koom ua ke muaj qhov ua tau zoo nyob rau hauv qee qhov kub thiab sijhawm.
Tsis tas li ntawd, + -theem titanium alloys tuaj yeem siv rau hauv cov tshuaj annealed, tshuaj kho lossis hnub nyoog laus. Yog hais tias annealing yuav tsum tau tom qab brazing, peb schemes muaj: brazing ntawm los yog qis dua qhov kub ntawm annealing tom qab annealing; brazing ntawm qhov kub siab tshaj qhov kub ntawm qhov annealing thiab txais yuav cov txheej txheem txias txias hauv lub voj voog brazing kom tau txais cov qauv annealing; thiab brazing ntawm qhov kub siab tshaj qhov annealing kub thiab ces annealing.