Cov kav dej tooj liab yog ib qho nyuaj thiab tsis yooj yim rau corrode. Lawv kuj tseem tiv taus qhov kub thiab txias thiab kev kub ntxhov thiab tuaj yeem siv rau ntau qhov chaw. Hauv kev sib piv, qhov tsis zoo ntawm ntau lwm cov kav dej yog pom tseeb. Piv txwv li, galvanized steel kav, uas feem ntau siv nyob rau hauv cov tsev nyob yav dhau los, yog yooj yim heev rau xeb. Tom qab siv sijhawm luv luv, cov kais dej yuav tig daj thiab cov dej ntws yuav txo qis. Qee cov ntaub ntawv yuav txo tau lawv lub zog sai ntawm qhov kub thiab txias, uas yuav ua rau muaj kev phom sij tsis zoo thaum siv cov kav dej kub. Txawm li cas los xij, qhov kub ntawm cov tooj liab yog siab li 1083 degrees Celsius, thiab qhov kub ntawm cov dej kub tsis zoo rau cov kav dej tooj liab. Cov kws tshawb fawb tshawb fawb tau tshawb pom cov kav dej tooj liab hnub rov qab 4,500 xyoo hauv Egyptian pyramids, uas tseem siv niaj hnub no.
Cov kav dej tooj liab yog cov kav ntev
Cov khoom siv tshuaj lom neeg ntawm tooj liab yog qhov ruaj khov, thiab nws ua ke cov yam ntxwv ntawm kev ua haujlwm txias, kub tsis kam, siab tsis kam, corrosion kuj thiab hluav taws kub tsis kam (tooj liab muaj qhov melting point txog 1083 degrees Celsius), thiab tuaj yeem siv tau ntev. nyob rau hauv ib puag ncig sib txawv. Lub neej kev pab cuam ntawm cov kav dej tooj liab tuaj yeem ntev npaum li lub neej ntawm lub tsev, lossis ntev dua. Piv txwv li, cov kav dej tooj liab tau teeb tsa hauv Peking Union Medical College Tsev Kho Mob hauv xyoo 1920s tau zoo rau ntau tshaj 70 xyoo. Nws tuaj yeem pom tau tias cov kav dej tooj liab yog cov kav dej uas tau sim ua tiav los ntawm ntau tshaj li ib puas xyoo ntawm lub sijhawm thiab kev ua haujlwm.
