1. Thermal Expansion Coefficient of Pure Copper
Ntshiab tooj liab (oxygen-dawb tooj liab los yog lag luam ntshiab tooj liab xws li T2, C11000) muaj ib tug kuj siab linear thermal expansion coefficient, uas yog ib qho ntawm nws cov khoom tseem ceeb hauv lub cev hauv kev siv engineering.
Los ntawm 20℃mus rau 100 degree: kwv yees li 16.5 × 10⁻⁶ / degree
Los ntawm 20℃mus rau 200 degree: kwv yees li 17.3 × 10⁻⁶ / degree
Los ntawm 20℃mus rau 300 degree: kwv yees li 17.7 × 10⁻⁶ / degree
Qhov no txhais tau hais tias thaum kub nce, cov tooj liab ntshiab nthuav dav, uas yuav tsum tau txiav txim siab hauv kev tsim thermal, kev sib dhos haum, thiab siab - qhov kub ntawm cov khoom siv.
2. Puas yog Pure Copper haum rau ntev -Lub Sij Hawm Siab- Kev Pabcuam Kub?
2.1 Xaus
Ntshiab tooj liab tsis haum rau ntev - siv lub sij hawm siab kub, tshwj xeeb tshaj yog saum 250℃.
Nws tsuas tuaj yeem tswj xyuas kev ua haujlwm ruaj khov rau kev ua haujlwm ntev -lub sijhawm ntawm qis dua 150℃hauv cov huab cua tsis muaj corrosive. Tshaj li qhov kub thiab txias, oxidation, softening, lub zog poob, thiab cov txheej txheem degradation ua hnyav thiab txwv nws lub neej kev pab cuam.
2.2 Kev ua tau zoo ntawm cov tooj liab ntshiab ntawm qhov kub thiab txias
(1) Accelerated Oxidation
Hauv qab 300 degree, tooj liab ua rau nyias oxide zaj duab xis (Cu₂O thiab CuO) uas muab kev tiv thaiv tsawg.
Tshaj 300 degree, oxidation nrawm nrawm heev. Cov oxide txheej ua tuab, xoob, thiab tsis muaj kev tiv thaiv, tsis tu ncua nkag mus rau sab hauv.Tshaj 500 degree, oxidation yog ceev heev, ua rau cov khoom siv, nto embrittlement, thiab tawg.
Nyob rau hauv ib puag ncig uas muaj leej faj, chlorine, lossis lwm yam khoom corrosive, siab -kub corrosion yog nrawm dua, ua rau tsis ua hauj lwm ntxov.
(2) Qhov tseem ceeb poob ntawm txhua yam muaj zog
Ntshiab tooj liab muaj qhov kub-kub lub zog thiab nws yooj yim rau softening thiab nkag.
Ntawm 100-200 degree, lub zog txo los ntawm 10% -20%.
Tshaj li 500 degree, qhov seem muaj zog tsawg dua li ib feem peb ntawm chav tsev kub, ua rau nws tsis tsim nyog rau cov qauv load-bearing.
(3) Deterioration ntawm hluav taws xob thiab thermal conductivity
Txawm hais tias tooj liab tseem ua tau zoo heev ntawm qhov kub thiab txias, nws cov hluav taws xob tiv thaiv tau nce nrog qhov kub thiab txias (kwv yees li +0.4% ib℃).
Ntawm 500 degree, resistivity ze li ob npaug, txo qhov kev ua tau zoo thiab ua kom muaj cua sov.
Thermal conductivity kuj txo qis ntawm qhov kub thiab txias, ua rau nws cov cua sov dissipation kom zoo dua.
2.3 Pom zoo Lub Sijhawm Ua Haujlwm Lub Sijhawm Ntev Ntev
Tsawg dua los yog sib npaug li 120 degree: Txheem qhov ntev-kev pabcuam kub rau cov khoom siv hluav taws xob, cables, thiab cov khoom siv hluav taws xob; ruaj khov thiab txhim khu kev qha.
120-250 degree: Txais tau rau cov kev pabcuam nruab nrab tab sis nrog kev laus nrawm; yuav tsum tau kuaj xyuas tsis tu ncua.
>250 degree: Tsis pom zoo rau kev siv mus ntev.
>500 degree: Tsuas yog rau lub sijhawm luv luv; Kev siv mus sij hawm ntev yuav ua rau tsis ua haujlwm sai.
2.4 Kev Txhim Kho Kev Ntsuas rau Kev Siv Kub Kub
Yog tias cov tooj liab ntshiab yuav tsum tau siv ntawm qhov kub siab, cov kev ntsuas hauv qab no tuaj yeem ua rau lub neej ua haujlwm ntev:
Txheej txheej: Nickel-plating, tin-plating, lossis silver-plating kom cais cov pa oxygen.
Tswj huab cua: Siv hauv inert lossis txo cov huab cua (nitrogen, hydrogen) txhawm rau txhawm rau oxidation.
Alloy hloov pauv: Brass, bronze, lossis tooj liab-nickel alloys muab kev ruaj ntseg zoo dua qub.
Tus qauv tsim: Cia qhov chaw thermal nthuav dav thiab txo qhov kev ntxhov siab thermal.
2.5 Cov ntsiab lus
Ntshiab tooj liab yog zoo heev rau thermal thiab hluav taws xob conduction ntawm qis mus rau nruab nrab kub (tsawg tshaj los yog sib npaug rau 150 degree).
Txawm li cas los xij, vim yog oxidation ceev, softening, thiab poob txhua yam khoom, nws tsis tsim nyog rau lub sij hawm ntev kev pab cuam kub siab tshaj 250℃.Rau high-temperature engineering daim ntaub ntawv, xaiv cov ntaub ntawv yuav tsum nyiam tshav kub-resistant tooj liab alloys los yog nto-tiv thaiv tooj liab Cheebtsam, nrog nruj txwv nyob rau hauv kev khiav hauj lwm kub thiab kev pab cuam ib puag ncig.
