Dawb Graphite Crystal Form
Apr 25, 2021
(1) Hexagonal boron nitride (zoo ib yam li graphite, tseem hu ua graphite boron nitride, dawb graphite). Tus txheeb ze tus ceev yog 2.25. Mohs hardness yog kwv yees li 2. Nws yog cov hmoov dawb uas yaj txog txog 3000 ° C hauv qab qhov siab. Nws muaj zoo hluav taws xob rwb thaiv tsev, thermal conductivity, corrosion kuj thiab zoo lubricity. Nws muaj cov tshuaj lom neeg zoo thiab tsis hnov mob nrog dej, acid lossis alkali ntawm chav tsev kub. Rhaub nrog dej thiab maj mam hydrolyze los tsim boric acid thiab ammonia. Cov tshuaj tiv thaiv nrog kub concentrated lossis molten alkali thiab chlorine kub. Yuav tiv taus kub siab txog 2000 ° C. Muaj lub zog muaj peev xwm nyiam cov khoom siv hluav taws xob. Nws tuaj yeem tau txais los ntawm cua kub borax thiab ammonium chloride nyob rau hauv ammonia roj ntws.
(2) Cubic boron nitride (hom pob zeb diamond). Nws yog xim dub lossis xim av muaj cov nplai. Qhov txheeb ze ntom yog 3.48. Lub ntsiab lus melting yog 3000 ° C. Lub hardness piv nrog pob zeb diamond. Qhov ruaj khov yog zoo dua pob zeb diamond thaum kub. Nws tuaj yeem tau ncaj qha nrog cov roj boron thiab nitrogen hauv qab qhov kub thiab kub siab.
