Cov kav dej tooj liab muaj kev nyab xeeb thiab ntseeg tau

Cov kav dej tooj liab sib xyaw ua ke qhov zoo ntawm ob qho tib si hlau thiab cov kav hlau tsis yog hlau. Nws yog ib qho nyuaj tshaj li cov kav dej yas thiab muaj lub zog siab ntawm cov hlau zoo tib yam (lub zog ntawm cov kav dej txias txias yog sib npaug rau cov kav hlau steel nrog tib lub phab ntsa tuab); Nws yog qhov yooj yim rau khoov dua li cov hlau zoo tib yam, muaj qhov zoo toughness thiab siab ductility, thiab muaj kev tiv thaiv zoo rau kev co, cuam tshuam, thiab te heave.
Cov kav dej tooj liab tuaj yeem tiv taus qhov txias txias thiab kub kub, nrog rau ntau yam kev siv los ntawm -196 degree C mus rau 250 degree C, thiab tuaj yeem hloov kho qhov kub thiab txias (- kub - tsis kub - siab kub -). Lawv qhov kev ua tau zoo yuav tsis txo qis vim kev siv mus ntev thiab kev hloov pauv kub, thiab lawv yuav tsis muaj kev laus. Qhov no yog dhau qhov ncav cuag ntawm cov kav dej zoo tib yam.
Lub linear expansion coefficient ntawm cov kav hlau yog me me, 1/10 ntawm cov kav dej yas, thiab tuaj yeem tiv taus qaug zog. Tshaj thermal expansion thiab contraction yuav tsis tshwm sim thaum lub sij hawm hloov kub, ua rau muaj kev ntxhov siab qaug zog tawg.
Cov yam ntxwv no ua rau cov kav dej tooj liab muaj txiaj ntsig zoo rau kev siv hauv thaj chaw txias. Nyob rau hauv qhov chaw txias heev, muaj qhov sib txawv ntawm qhov kub thiab txias thaum sawv ntxov thiab yav tsaus ntuj, thiab cov kav dej zoo tib yam muaj cov kab sib txuas loj loj thiab tsis muaj zog, uas yooj yim ua rau muaj kev ntxhov siab qaug zog los ntawm thermal expansion thiab contraction. Ib txhia hais tias tsis nkig ntawm -20 degrees, tab sis lawv tsis tuaj yeem tiv taus kev ua haujlwm siab thiab muaj lub neej ua haujlwm luv luv, uas tsis yog siv tau. Txawm hais tias kev ntsuas rwb thaiv tsev tuaj yeem ua tau, nws yog qhov nyuaj kom tsis txhob ntsib qhov kub qis thaum lub sijhawm thauj mus los, khaws cia, thiab teeb tsa. Kev ua haujlwm ntawm cov kav dej tooj liab zoo ib yam ntawm -183 degrees thiab chav tsev kub.