Titanium thiab titanium alloys yog cov hlau nquag siv thiab tau siv dav hauv kev lag luam aerospace, petrochemical thiab atomic zog. Cov teeb meem tseem ceeb hauv kev brazing ntawm titanium thiab titanium alloys yog raws li hauv qab no:
① Cov oxide zaj duab xis ntawm qhov chaw ruaj khov. Titanium thiab nws cov alloys muaj kev sib raug zoo nrog oxygen. Ib zaj duab xis oxide ruaj khov heev yog tsim tau yooj yim rau ntawm qhov chaw, uas tiv thaiv cov tawv nqaij los ntawm ntub thiab sib kis. Yog li ntawd, nws yuav tsum tau muab tshem tawm thaum lub sij hawm soldering.
② Nws muaj lub siab nyiam nqus hydrogen, oxygen thiab nitrogen thaum cua sov. Titanium thiab nws cov alloys muaj ib tug nyiam nqus hydrogen, oxygen thiab nitrogen, thiab qhov kub thiab txias, qhov hnyav dua qhov nqus, uas ua rau kom cov yas thiab tawv tawv ntawm titanium hlau, yog li brazing yuav tsum tau nqa tawm hauv lub tshuab nqus tsev lossis inert cua.
③ Nws yog ib qho yooj yim los tsim cov sib txuas sib txuas. Titanium thiab nws cov alloys tuaj yeem hnov mob chemically nrog ntau cov ntaub ntawv siv los ua cov khoom sib xyaw ua ke, ua rau kev sib koom ua nkig. Yog li ntawd, cov hlau muab tub lim siv rau brazing lwm cov ntaub ntawv yog qhov yooj yim tsis haum rau brazing active hlau.
④ Lub koom haum thiab kev ua haujlwm tau yooj yim hloov pauv. Titanium thiab nws cov alloys yuav dhau mus rau theem hloov pauv thiab lis coarsening thaum rhuab. 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.
Nyob rau hauv luv luv, lub brazing cua kub kub yuav tsum tau them sai sai rau thaum brazing titanium thiab nws alloys. Feem ntau hais lus, lub brazing kub yuav tsum tsis pub tshaj 950 ~ 1000 degree. Qhov qis dua qhov kub ntawm brazing, qhov me me cuam tshuam rau cov khoom ntawm lub hauv paus hlau. Rau quench-aged alloys, brazing tuaj yeem ua tau yam tsis muaj qhov kub thiab txias.
