KOVAR Hlau

Kovar yog npib tsib xee-cobalt ferrous alloy, tsim kom muaj ntau yam zoo ib yam thermal expansion yam ntxwv xws li borosilicate iav (~ 5 × 10−6 / K ntawm 30 thiab 200 degree, mus rau ~ 10 × 10−6 / K ntawm 800 degree) rau tso cai rau cov neeg kho tshuab nruj sib koom ua ke ntawm ob cov ntaub ntawv dhau ntawm qhov kub thiab txias. Nws pom daim ntawv thov nyob rau hauv cov iav-rau-hlau ntsaws ruaj ruaj nyob rau hauv scientific apparatus, thiab conductors nkag mus rau iav hnab ntawv ntawm hluav taws xob qhov chaw xws li lub tshuab nqus tsev raj (valve), X-ray thiab microwave tubes thiab ib co lub teeb.

Kovar tsis tsuas yog muaj thermal expansion zoo ib yam li iav, tab sis nws cov nonlinear thermal expansion nkhaus feem ntau tuaj yeem ua kom haum rau lub khob, yog li tso cai rau kev sib koom ua ke rau qhov kub thiab txias. Chemically, nws bonds rau iav ntawm nruab nrab oxide txheej ntawm nickel (II) oxide thiab cobalt (II) oxide. Qhov feem ntawm cov hlau oxide yog tsawg vim nws txo qis nrog cobalt. Lub zog ntawm daim ntawv cog lus yog nyob ntawm qhov oxide txheej thickness thiab tus cwj pwm. Lub xub ntiag ntawm cobalt ua rau oxide txheej yooj yim rau yaj thiab yaj hauv cov iav molten. Grey, grey-xiav lossis grey-xim av xim qhia tau tias muaj kev sib khi zoo. Cov xim xim hlau qhia tias tsis muaj oxide, thaum xim dub qhia tias cov hlau oxidized dhau lawm, ob qho tib si ua rau muaj kev sib koom ua ke tsis muaj zog.

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