Kev soj ntsuam ntawm Precious Hlau Brazing txheej txheem

Cov hlau zoo nkauj tsuas yog xa mus rau Au, Ag, Pd, Pt thiab lwm yam ntaub ntawv, uas muaj cov khoom siv hluav taws xob zoo, thermal conductivity, corrosion kuj thiab kub melting kub. Lawv tau siv dav hauv kev tsim cov khoom siv qhib thiab kaw hauv cov khoom siv hluav taws xob.

 

 

Brazing yam ntxwv ntawm precious hlau:
Raws li cov khoom siv electroshock, cov hlau tseem ceeb muaj qhov sib txawv ntawm qhov chaw me me, xav kom cov hlau brazing muaj qhov cuam tshuam zoo, lub zog siab, qee yam oxidation tsis kam thiab tuaj yeem tiv taus arc nres, tab sis tsis hloov cov yam ntxwv ntawm cov khoom sib cuag thiab cov khoom siv hluav taws xob. . Vim qhov kev txwv ntawm electro-shock brazing cheeb tsam, tsis pub muab tub lim hlau overflow. Cov txheej txheem brazing yuav tsum nruj me ntsis tswj.

Feem ntau cov txheej txheem cua sov tuaj yeem siv los txhawm rau cov hlau muaj txiaj ntsig zoo. Nplaim brazing feem ntau yog siv rau cov rooj sib tham loj. Induction brazing yog tsim rau ntau lawm. Kev tiv thaiv brazing tuaj yeem ua tau nrog cov neeg siv hluav taws xob sib txawv, tab sis me dua tam sim no thiab lub sij hawm ntev brazing yuav tsum raug xaiv, carbon thaiv tuaj yeem siv los ua electrode. Rauv brazing tuaj yeem siv tau thaum muaj ntau cov khoom sib tiv tauj yuav tsum tau brazed tib lub sijhawm lossis thaum muaj ntau tus neeg sib txuas rau ntawm ib feem. Precious hlau yog brazed nyob rau hauv cov huab cua los ntawm ntau txoj kev. Qhov zoo ntawm cov pob qij txha tau txais yog tsis zoo, thiab lub tshuab nqus tsev brazing ua rau cov pob qij txha zoo tsis muaj kev cuam tshuam rau cov khoom nws tus kheej.

Xaiv cov khoom siv hlau rau brazing noble hlau:
Nyiaj-raws li thiab tooj liab-raws li solders feem ntau yog siv rau brazing kub thiab nws cov alloy tiv tauj, uas tsis tsuas yog xyuas kom meej cov hluav taws xob conductivity ntawm brazing seam, tab sis kuj ua rau nws yooj yim rau ntub. Yog tias qhov kev xav tau ntawm kev sib koom ua ke tuaj yeem ua tau raws li, cov khoom siv uas muaj Ni, Pd, Pt thiab lwm yam khoom siv tuaj yeem siv. Nws tseem tuaj yeem siv brazing muab tub lim hlau nrog npib tsib xee thiab cobalt alloys thiab zoo oxidation tsis kam, xws li Ag-cu-Ti muab tub lim hlau, ntawm qhov kub thiab txias tsis siab tshaj 1000 C.

Cov nyiaj oxide generated ntawm cov nyiaj saum npoo tsis ruaj khov thiab tuaj yeem yooj yim brazed. Sn-Pb solder nrog zinc chloride aqueous tov los yog rosin tuaj yeem siv los ua tus neeg sawv cev rau cov nyiaj soldering. Silver solder feem ntau yog siv rau brazing, nrog borax, boric acid los yog lawv cov sib tov ua cov hlau muab tub lim. Silver-based solders xws li B-Ag61CuIn, B-Ag59CuSn thiab B-Ag72Cu feem ntau yog siv rau lub tshuab nqus tsev ntawm cov nyiaj thiab nws cov nyiaj alloy hu.

Brazing palladium hu tuaj yeem ua nrog kub-raws li cov kuab tshuaj nickel-raws li yooj yim tsim los yog nyiaj-raws li, tooj liab-raws li lossis manganese-based solders.

Brazing platinum thiab nws cov platinum alloy hu, nyiaj-raws li, tooj liab-raws li, kub-raws li los yog palladium-raws li solders yog dav siv. B-Au70Pt30 solder raug xaiv, uas tsis tsuas yog tsis hloov xim ntawm platinum, tab sis kuj tuaj yeem txhim kho qhov kub thiab txias thiab ua kom lub zog thiab hardness ntawm solder sib koom ua ke. B-Ti49Cu49Be2 solder yog muaj yog cov platinum tiv tauj yuav tsum tau soldered ncaj qha rau Kovar alloy. Rau cov platinum hu ua haujlwm hauv cov xov xwm tsis muaj corrosive ntawm qhov kub tsis tshaj 400 C, cov pa ntshiab tsis muaj tooj liab solder nrog tus nqi qis thiab kev ua haujlwm zoo yuav tsum tau nyiam.

Ua ntej brazing, vuam qhov chaw, tshwj xeeb tshaj yog cov khoom tiv tauj, yuav tsum tau kuaj xyuas thiab hnov. Cov kev sib cuag tau xuas nrig ntaus tawm ntawm daim ntawv los yog txiav tawm ntawm cov slats yuav tsum tsis txhob deformed los ntawm xuas nrig ntaus los yog shearing. Lub brazing nto ntawm kev sib cuag tsim los ntawm kev ntxhov siab, precision nias thiab forging yuav tsum ncaj nraim kom ntseeg tau tias kev sib cuag zoo nrog lub tiaj tiaj ntawm kev txhawb nqa. Qhov saum npoo ntawm qhov chaw yuav tsum tau welded los yog ntawm ib lub vojvoog yuav tsum tau muab sib npaug sib npaug los xyuas kom meej qhov kev txiav txim siab capillary thaum lub sij hawm brazing.

Ua ntej brazing ntau yam kev sib cuag, oxide zaj duab xis nyob rau saum npoo ntawm lub vuam yuav tsum raug tshem tawm los ntawm kev siv tshuaj lom neeg lossis kev siv tshuab, thiab qhov chaw ntawm lub vuam yuav tsum tau ua tib zoo ntxuav nrog roj av los yog cawv kom tshem tawm cov roj, roj, plua plav thiab av uas cuam tshuam rau ntub dej thiab ntws.

Rau me me weldments, siv cov nplaum rau hauv qhov chaw ua ntej kom tsis muaj kev hloov pauv thaum lub sijhawm ua khoom siv hauv cub tawg, muab tub lim hlau thauj khoom thiab lwm yam txheej txheem tuav. Cov adhesives siv yuav tsum tsis txhob cuam tshuam rau brazing. Rau qhov loj weldments los yog kev sib cuag tshwj xeeb, kev sib dhos yuav tsum tau ua los ntawm txoj kev clamps nrog tsa los yog grooves kom stabilize qhov weldment.

Vim yog qhov zoo thermal conductivity ntawm cov khoom siv hlau zoo, cov cua sov yuav tsum tau txiav txim siab raws li hom khoom. Tus nqi cua txias yuav tsum tau tswj kom tsim nyog kom lub brazing kev sib koom tes kev nyuaj siab yog uniform. Cov txheej txheem cua sov yuav tsum ua kom lub brazing qhov chaw kom ncav cuag qhov kub ntawm lub brazing tib lub sijhawm. Rau cov hlau muaj nuj nqis me me, cov cua sov ncaj qha yuav tsum raug zam thiab cov cua sov ua haujlwm tuaj yeem ua nrog lwm qhov chaw. Ib tug npaum li cas ntawm lub siab yuav tsum tau siv rau cov neeg kom lawv ruaj thaum lub solder melts thiab ntws. Txhawm rau kom tswj tau qhov nruj ntawm kev sib cuag los yog kev txhawb nqa, annealing yuav tsum tau zam thiab cov cua sov yuav raug txwv rau thaj tsam ntawm lub brazing nto, xws li los ntawm kev kho qhov chaw ntawm nplaim taws, induction lossis tiv thaiv brazing. Tsis tas li ntawd, txhawm rau kom tsis txhob muaj cov khoom muaj txiaj ntsig zoo hauv cov khoom siv hlau brazing, kev ntsuas xws li kev tswj cov nyiaj ntawm cov khoom siv hlau brazing, kom tsis txhob muaj cua sov ntau dhau, txwv lub sijhawm brazing ntawm qhov kub thiab txias, thiab kev faib tawm ntawm cov cua sov tuaj yeem siv tau.