corrosion kuj
corrosion kujtuaj yeem siv los sib txawv ntawm ob lub hlau. Ob lub hlau no tsis muaj hlau, yog li lawv tsis xeb yooj yim. Tooj liab oxidizes dhau ib lub sij hawm los tsim ib tug ntsuab patina. Qhov no tiv thaiv corrosion ntxiv ntawm tooj liab hlau nto. Txawm li cas los xij, tooj dag yog ib qho alloy ntawm tooj liab, zinc, thiab lwm yam khoom uas kuj tiv taus corrosion. Piv txwv li, tooj dag muaj xim golden thiab ntau dua corrosion kuj piv rau tooj liab.
Kev coj ua
Cov conductivity sib txawv ntawm ntau yam hlau feem ntau tsis to taub. Txawm li cas los xij, piv txwv li cov conductivity ntawm ib qho khoom siv vim nws zoo ib yam li lwm cov khoom siv hluav taws xob ntawm lub peev xwm paub yuav ua rau muaj kev puas tsuaj rau qhov project. Qhov yuam kev no yog qhov pom tseeb me ntsis hauv kev hloov ntawm tooj dag rau tooj liab hauv kev siv hluav taws xob. Los ntawm qhov sib txawv, tooj liab yog tus qauv conductivity rau ntau cov ntaub ntawv. Cov kev ntsuas no tau qhia raws li kev ntsuas tooj liab. Qhov no txhais tau hais tias tooj liab tsis muaj qhov tsis kam thiab yog 100 feem pua kev coj ua hauv qhov kev txiav txim siab. tooj dag, ntawm qhov tod tes, yog ib qho alloy ntawm tooj liab thiab nws cov conductivity tsuas yog 28 feem pua ntawm cov tooj liab.
thermal conductivity
Thermal conductivity ntawm cov khoom tsuas yog ib qho kev ntsuas ntawm nws lub peev xwm los ua cua sov. Qhov thermal conductivity no txawv ntawm cov hlau mus rau hlau, yog li nws yuav tsum tau coj mus rau hauv tus account thaum cov khoom yuav tsum tau siv nyob rau hauv qhov kub thiab txias kev khiav hauj lwm ib puag ncig. Lub thermal conductivity ntawm cov hlau ntshiab tseem nyob tas li nrog qhov kub thiab txias, thaum lub thermal conductivity ntawm alloys nce nrog nce kub. Hauv qhov no, tooj liab yog cov hlau ntshiab, thaum tooj dag yog cov hlau alloyed. Hauv kev sib piv, tooj liab muaj qhov ua tau zoo tshaj plaws ntawm 223 BTU / (hrft. F), thaum tooj dag muaj qhov conductivity ntawm 64 BTU / (hrft. F).
melting point
Lub melting point ntawm cov hlau yog qhov tseem ceeb rau kev xaiv cov khoom siv engineering. Qhov no yog vim hais tias, nyob rau hauv lub melting point, tivthaiv tsis ua hauj lwm yuav tshwm sim. Thaum cov khoom siv hlau mus txog nws qhov chaw melting, nws hloov ntawm cov khoom mus rau cov kua. Lub sijhawm no, cov khoom siv tsis tuaj yeem ua nws txoj haujlwm. Lwm qhov laj thawj yog tias cov hlau tau yooj yim tsim thaum lawv ua kua. Qhov no yuav pab xaiv qhov zoo tshaj plaws formability ntawm tooj liab thiab tooj dag uas ib qhov project xav tau. Nyob rau hauv metric cov ntsiab lus, tooj liab muaj ib tug melting point txog 1084 degree (1220 degree F), thaum tooj dag muaj ib tug melting point ntawm 900 degree mus rau 940 degree. Lub melting point ntau ntawm tooj dag yog vim muaj ntau yam elemental compositions.
tawv
Lub hardness ntawm cov khoom yog nws lub peev xwm los tiv thaiv lub zos deformation, uas tej zaum yuav los ntawm indentation ntawm ib tug predetermined geometric indenter ntawm ib tug hlau dav hlau nyob rau hauv ib tug predetermined load. Raws li cov hlau, tooj dag muaj zog dua tooj liab. Nyob rau hauv cov nqe lus ntawm hardness Performance index, lub hardness ntawm tooj dag yog li ntawm 3 mus rau 4. Ntawm qhov tod tes, tooj liab muaj ib tug hardness ntawm 2. zinc. Qhov siab dua cov ntsiab lus zinc, qhov zoo dua qhov hardness thiab ductility ntawm tooj dag.
hnyav
Thaum muab piv rau qhov hnyav ntawm cov hlau, cov dej tuaj yeem xaiv tau raws li lub hauv paus rau lub ntiajteb txawj nqus tshwj xeeb - muab tus nqi ntawm 1. Qhov tshwj xeeb lub ntiajteb txawj nqus ntawm ob lub hlau yog ces muab piv rau ib feem ntawm qhov hnyav dua los yog sib dua. Tom qab ua li ntawd, peb pom tias tooj liab yog qhov hnyav tshaj plaws, nrog qhov ceev ntawm 8930 kg / m3. Ntawm qhov tod tes, qhov ntom ntawm tooj dag txawv ntawm 8400 kg / m3 txog 8730 kg / m3 nyob ntawm seb nws muaj pes tsawg leeg.
Durability
Durability ntawm cov khoom siv yog hais txog lub peev xwm ntawm cov khoom siv los ua haujlwm yam tsis muaj kev kho lossis kev saib xyuas tsis zoo thaum ntsib cov teeb meem kev ua haujlwm ib txwm ua thaum nws ib nrab lub neej. Ob lub hlau tau nthuav tawm ze li qhov sib npaug ntawm cov kav ntev hauv lawv cov haujlwm. Txawm li cas los xij, tooj liab pom qhov yooj yim tshaj plaws piv rau tooj dag.
machinability
Lub machinability ntawm cov khoom yog hais txog lub peev xwm ntawm cov khoom yuav raug txiav (machined) kom tau txais qhov chaw ua tiav. Machining kev ua ub no muaj xws li txiav, txiav, tuag casting, thiab lwm yam. Processability kuj raug txiav txim siab raws li cov ntaub ntawv ntawm kev tsim khoom. Hauv kev sib piv, tooj dag yog machinable ntau dua tooj liab. Qhov no ua rau tooj dag zoo tagnrho rau cov ntawv thov uas xav tau qib zoo ntawm formability.
Formability
Tooj liab muaj qhov tshwj xeeb formability, zoo tshaj plaws piav qhia los ntawm nws lub peev xwm los tsim micron-loj hlau nrog tsawg softening annealing. Nyob rau hauv dav dav, lub zog nce ntawm tooj liab alloys xws li tooj dag yog proportional rau qhov xwm thiab tus nqi ntawm kev ua hauj lwm txias. Feem ntau siv txoj kev tsim muaj xws li tuag casting, dabtsi yog khoov, kos duab thiab kos duab sib sib zog nqus. Piv txwv li, casing tooj dag qhia txog qhov sib sib zog nqus kos cov yam ntxwv. Qhov tseem ceeb, tooj liab thiab tooj dag-tooj liab alloys nthuav tawm tshwj xeeb formability, tab sis tooj liab yog hloov tau yooj yim piv rau tooj dag.
Weldability
Tooj yog yooj yim rau solder dua tooj dag. Txawm li cas los xij, tag nrho cov tooj dag yog solderable tsuas yog cov uas muaj txhuas. Tsis tas li ntawd, qhov me me ntawm zinc cov ntsiab lus hauv tooj dag, nws yooj yim dua rau vuam. Yog li ntawd, tooj dag nrog zinc cov ntsiab lus tsawg dua 20 feem pua tau zoo weldability, thiab tooj dag nrog zinc cov ntsiab lus ntawm ntau tshaj 20 feem pua ntawm cov weldability zoo dua. Thaum kawg, cam khwb cia tooj dag hlau tsuas yog NW nyuam qhuav yuav welded.Raws li tau hais ua ntej lawm, txhuas-tin tooj dag alloys tsis tau solderable. Yuav tsum raug zam rau qhov kub ntawm vuam, siab preheat thiab qeeb cua txias.
Yield zog
Lub zog tawm los yog suav tias yog qhov kev ntxhov siab siab tshaj plaws uas cov khoom pib deform mus tas li. Hauv kev sib piv ntawm tooj liab thiab tooj dag, tooj dag muaj lub zog tawm los ntau dua li tooj liab. Txhawm rau txhawb qhov kev thov no, cov khoom siv tooj dag 34.5 yog siab li 683 MPa (5000 - 99100 psi), thaum cov khoom siv tooj liab yog 33.3 MPa (4830 psi).
qhov kawg tensile zog
Qhov kawg tensile lub zog ntawm ib feem lossis cov khoom siv yog nws lub zog siab tshaj plaws tiv thaiv kev puas tsuaj. Brass yog ib qho nyuaj thiab muaj zog dua tooj liab, yog li nws muaj ntau dua rau kev ntxhov siab tawg. Qhov no piav qhia vim li cas qhov kawg tensile lub zog ntawm tooj dag yog qis dua, tab sis tuaj yeem nce ntxiv nyob ntawm qhov muaj pes tsawg leeg. Qhov kawg tensile stress ntawm tooj liab yog 210 MPa (30500 psi). tooj dag, ntawm qhov tod tes, muaj qhov kawg tensile zog ntau yam ntawm 124 - 1030 MPa (18000 - 150000 psi).
Shear zog
Lub zog shear yog lub zog ntawm cov khoom siv tiv thaiv kev tawm los lossis kev ua haujlwm tsis zoo, tshwj xeeb tshaj yog thaum cov khoom tsis ua haujlwm. Nyob rau hauv tas li ntawd, ib tug shear load yog ib tug quab yuam uas ua rau zawv zawg tsis ua hauj lwm ntawm ib cov khoom los yog cov tswv cuab nyob rau hauv ib tug dav hlau mus txog rau thaum xaus ntawm lub zog. Thaum ntsuas, nws pom tseeb tias tooj dag muaj lub zog siab tshaj plaws (35, 000 psi - 48, 000 psi), thaum tooj dag muaj lub zog qis tshaj plaws (25, {{5}) }psi).
