Hom lattice, melting point, thermal conductivity, linear expansion coefficient, thiab tshuaj muaj pes tsawg leeg ntawm tooj liab thiab titanium daim hlau txawv heev, yog li nws nyuaj heev rau welding.
1. Welds yog qhov yooj yim rau pores
(1) tooj liab thiab titanium muaj zog hydrogen nqus peev xwm ntawm qhov kub thiab txias, thiab hydrogen yog ntau soluble hauv kua tooj liab thiab titanium.
(2) Gas yog tsim nyob rau hauv high-temperature metallurgical tshuaj tiv thaiv molten pas dej ua ke.
(3) Cov pa oxygen thiab nitrogen nyob ib ncig ntawm qhov chaw vuam yog muab tso rau hauv lub pas dej molten. Thaum lub sij hawm crystallization txheej txheem ntawm lub pas dej molten, tag nrho cov roj tsis tuaj yeem khiav tawm ntawm lub pas dej molten thiab tseem nyob rau hauv qhov sib txuas los tsim cov pores.
2. Welded pob qij txha yog qhov ua rau tawg
Thaum tooj liab thiab titanium yog welded, eutectic thiab hydride tuaj yeem tsim rau ntawm cov hlau sab ntawm ob lub hauv paus ntaub ntawv, uas tuaj yeem ua rau tawg yooj yim nyob rau hauv qhov kev txiav txim ntawm vuam kev nyuaj siab.
(1) tooj liab thiab bismuth tsim ib tug (Cu + Bi) eutectic nrog ib tug eutectic point ntawm 270 degree.
(2) tooj liab thiab txhuas ua ib (Cu + Pb) eutectic nrog ib tug eutectic point ntawm 326 degree.
(3) tooj liab thiab ferrous sulfide tsim ib tug eutectic (Cu + Cu2O) nrog ib tug eutectic point ntawm 1067 degree.
(4) Flake-zoo li hydride TiH2 yog tsim nyob rau sab hlau ntawm titanium puag khoom, ua rau hydrogen embrittlement.
(5) Cov kab sib txuas sib txuas ntawm tooj liab thiab titanium yog ntau dua 1 npaug sib txawv, uas yuav ua rau muaj kev ntxhov siab ntau dua thaum vuam.
3. Cov khoom siv ntawm cov welded pob qij txha yog tsawg
(1) oxide zaj duab xis tuaj yeem ua rau tsis muaj zog ntawm kev sib txuas ntawm tooj liab thiab titanium. Piv txwv li, thaum cov ntsiab lus oxygen nyob rau hauv lub weld nce mus txog 0.38%, lub kaum sab xis sib koom ua ke txo qis ntawm 180 degree mus rau 120 degree .
(2) Ib qho loj ntawm eutectic thiab hydrides txo cov plasticity thiab toughness ntawm welded pob qij txha.
(3) Kev sib koom ua ke ntawm tooj liab thiab titanium yog qhov me me, thiab cov khoom sib txuas sib txuas tau yooj yim tsim ntawm qhov kub thiab txias. Xws li Ti2Cu, TiCu, Ti3Cu4, Ti2Cu3, TiCu2, thiab TiCu4, uas ua rau kom brittleness, txo cov yas, thiab txo cov corrosion kuj ntawm cov hlau weld.
Cov pob qij txha zoo heev tuaj yeem tau txais los ntawm lub tshuab nqus tsev vacuum, argon arc vuam, plasma arc vuam, brazing, thiab electron beam vuam ntawm tooj liab thiab titanium lossis titanium alloys.
Piv txwv li: lub tshuab nqus tsev diffusion vuam yog siv. Cov yam ntxwv ntawm lub tshuab nqus tsev vacuum diffusion vuam yog tias cov pob qij txha tsis oxidize, weld seams muaj qhov zoo nkauj zoo nkauj, thiab cov khoom zoo. Cov txheej txheem tseem ceeb ntawm kev ua haujlwm yog: ua ntej welding, tooj liab puag hlau (xws li T2) yog ntxuav nrog trichlorethylene kom tshem tawm cov roj stains thiab lwm yam impurities. Tom qab ntawd nws yog etched nyob rau hauv 10% sulfuric acid tov rau 1 feeb, ntxuav nrog dej distilled, thiab ces annealed. Lub annealing kub yog 820 ~ 830 degree thiab lub sij hawm annealing yog 10 feeb.
Tom qab ntxuav cov titanium puag hlau (TA2) nrog trichloroethylene, siv txoj kev vibration los etch nws rau 4 feeb hauv 2% ntim feem ntawm HF thiab 50% ntim feem ntawm HNO3 aqueous tov kom tshem tawm cov oxide zaj duab xis, thiab tom qab ntawd ntxuav nws. nrog dej thiab cawv.
(4) Sib sau ua ob lub hauv paus hlau raws li cov txheej txheem, thiab tom qab ntawd muab tso rau hauv lub tshuab nqus tsev rau vuam. Lub vuam tsis yog: vuam kub yog 810 degree ± 10 degree, siab yog 5 ~ 10MPa, lub sij hawm yog 10min, thiab nqus tsev kawm ntawv yog 1.3332 × 10-8 ~ 1.3332 × 10-9MPa. Ib txheej nruab nrab diffusion tuaj yeem ntxiv ntawm ob lub hauv paus hlau. Feem ntau, cov khoom siv diffusion txheej yog niobium hlau, lossis tsis muaj qhov nruab nrab diffusion txheej. Ua tib zoo ntxuav qhov sib koom ua ke tom qab vuam.
Yog tias argon arc vuam siv los vuam tooj liab thiab titanium, xaiv cerium tungsten electrodes tuaj yeem txhim kho qhov vuam zoo thiab muaj txiaj ntsig zoo rau tib neeg kev noj qab haus huv. Piv txwv li, thaum vuam tooj liab alloy (QCr{0}}.5) thiab titanium alloy (TC2), niobium tuaj yeem siv los ua cov txheej txheem hloov pauv, thiab argon purity yog 99.8% kom tau txais cov pob qij txha zoo.
