Aluminium Boride hmoov, AlB2

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Aluminium Boride hmoov, AlB2

Aluminium boride (AlB2) yog ib hom ntawm binary compound tsim los ntawm txhuas thiab boron.

Nws yog qhov tso xim txho liab hauv qab qhov kub thiab txias. Nws yog qhov ruaj khov nyob rau hauv txias dilute acid, thiab decomposed hauv kub hydrochloric acid thiab nitric acid. Nws yog ib qho ntawm ob qho kev sib txuas ntawm txhuas thiab boron.


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Cov mis mos molecular  AB2
Tus Lej  12041-50-8
Nta  hmoov dub thiab txho
Yog ceev  3.19 g / cm3
Melting taw tes  1655C
Kev Siv  Cermet

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Aluminium borate (AlB2) yog ib hom binary compound tsim los ntawm txhuas thiab boron. Nws yog qhov tso xim txho liab hauv qab qhov kub thiab txias. Nws yog qhov ruaj khov nyob rau hauv txias dilute acid, thiab decomposed hauv kub hydrochloric acid thiab nitric acid. Nws yog ib qho ntawm ob qho kev sib txuas ntawm txhuas thiab boron. Lwm qhov yog alb12, uas feem ntau hu ua aluminium borate. Alb12 yog lub lustrous dub monoclinic siv lead ua nrog lub nqus tshwj xeeb ntawm 2.55 (18 ℃).

Nws yog insoluble hauv dej, acid thiab alkali. Nws decomposes hauv kub nitric acid thiab tau los ntawm melting boron trioxide, leej faj thiab txhuas ua ke.

Hauv cov qauv, B atoms tsim graphite plaub ya ri nrog Al atoms ntawm lawv, uas yog qhov zoo sib xws nrog cov qauv ntawm magnesium diboride. Qhov siv lead ua ib qho ntawm AlB2 qhia cov hlau conductivity raws txoj kab sib luag rau cov hlau ua haujlwm hexagonal ntawm lub substrate. Boron aluminium composites yog ntxiv dag zog los ntawm boron fiber lossis boron fiber nrog tiv thaiv txheej.

Cov ntim cov ntsiab lus ntawm boron fiber yog kwv yees li 45% ~ 55%. Lub ntiajteb txawj nqus tsawg tsawg, siab txhua yam khoom. Qhov ntev ntawm qhov ua tau zoo tensile thiab elastic qauv ntawm unidirectional reinforced boron aluminium composite yog li ntawm 1.2 ~ 1.7gpa thiab 200 ~ 240gpa, feem.

Qhov ntev ntawm qhov tshwj xeeb elastic modulus thiab lub zog tshwj xeeb yog txog 3 ~ 5 zaug thiab 3 ~ 4 npaug ntawm titanium alloy duralumin thiab alloy hlau, feem. Nws tau siv hauv turbojet cav tshuab kiv cua tshuab, dav hlau hauv tsheb thiab cov qauv satellite. Cov kub nias diffusion kev sib koom txoj kev yog siv los tsim cov phaj, txuas thiab qhov chaw nrog cov duab puab, thiab cov txheej txheem nruam tuaj yeem siv tau los tsim ntau cov ntawv qhia.

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