Refractory hlau yog ib pawg ntawm cov hlauuas muaj cua sov zoo heev thiab hnav tsis kam, ua rau lawv zoo tagnrho rau kev siv hauv kev ua haujlwm siab. Cov hlau no muaj cov ntsiab lus melting siab thiab tshwj xeeb tshaj yog nyuaj rau kev ua haujlwm nrog, tab sis lawv muaj kev ua tau zoo tsis sib xws hauv ib puag ncig hnyav.
Cov pab pawg hlau refractory suav nrog ntau lub ntsiab lus, xws li tungsten, molybdenum, niobium, tantalum, thiab rhenium. Cov hlau no muaj cov khoom tshwj xeeb uas ua rau lawv zoo tagnrho rau kev siv tshwj xeeb. Piv txwv li, tungsten muaj lub siab tshaj plaws melting point ntawm tej hlau, thaum molybdenum paub txog nws lub zog siab, hardness, thiab tsis kam mus corrosion.
Cov ntawv thov ntawm cov hlau refractory muaj ntau, thiab lawv feem ntau siv rau ntau yam kev lag luam. Hauv aerospace, piv txwv li, kev siv cov hlau refractory yog qhov tseem ceeb hauv kev tsim cov khoom siv dav hlau ua haujlwm siab uas tuaj yeem tiv taus qhov kub thiab txias. Cov hlau no kuj siv rau hauv kev kho mob, qhov chaw uas lawv feem ntau siv rau hauv kev kho mob cog thiab cov khoom siv prosthetic vim lawv cov biocompatibility thiab tsis kam hnav thiab tsim kua muag.
Hauv kev xaus, cov hlau refractory yog ib pab pawg tseem ceeb ntawm cov hlau siv hauv ntau yam kev ua haujlwm siab. Lawv muab cov kev ua tau zoo tsis sib xws hauv ib puag ncig hnyav thiab yog cov cuab yeej muaj txiaj ntsig hauv ntau qhov kev lag luam.
