Hexagonal boron nitride ntụ ntụ

boron nitride powders bụ ihe dị ọcha dị elu nke a na-eji na ngwa nhazi ígwè nke na-enye conductivity thermal, eletriki mkpuchi na mma mmanu mmanu. Ngwa ndị a na-ahụkarị maka ihe a bụ iji waxes organic ma ọ bụ mmanụ dochie graphite maka ịrụ ọrụ nke ọma.

hexagonal boron nigride (h-BN) na-anya isi ihe ndị pụrụ iche dị ka nkwụsi ike okpomọkụ dị elu, kemịkalụ iguzogide ọla mgbaze na obere ọnụọgụ nke mgbasawanye thermal; Ọzọkwa enwere ike ijikwa ya.

Nrụpụta okpomọkụ

Thermal conductivity (a na-akpọkwa ya “k” ma ọ bụ lambda) nke ihe na-atụle otú ọkụ si dị mfe na-agafe na ha, ma dabara na gradient okpomọkụ n'ofe ihe ahụ. Convection na radieshon bụ ụzọ ndị ọzọ nke nnyefe okpomọkụ na-eji ụzọ dị iche iche; thermal conductivity na-enye otu azịza ga-ekwe omume.

Ọla na-enwekarị conductivities thermal dị elu karịa ndị na-abụghị ọla n'ihi ịbụ ndị na-eduzi phonons ka mma. – ndị na-ebu ume dị n'ime ihe siri ike – karịa ihe ndị na-abụghị ọla, ma na-abụghị ígwè thermal conductivity ka nwere ike ịdị elu, na-eme ka ikpo ọkụ nke ihe onwunwe bụrụ ihe dị mkpa maka imewe ya ka ọ na-ekpebi ngwa ngwa ọkụ nwere ike isi na-agafe..

anyị na-enye ụlọ ọrụ ọkwa okirikiri, cubical hexagonal na wurzite boron nitride ntụ ntụ na nnukwu ntupu na nha nha nke dabara adaba maka ngwa dị iche iche.. Ihe ntụ ntụ seramiiki anyị dabara na ọkwa dị iche iche dịka Mil Spec; Ọkwa nka nka ACS Reagent; Nri, Agricultural Pharmaceutical; EP/BP ọkwa USP.

Ihe mkpuchi eletrik

Hexagonal boron nitride bụ ihe mkpuchi eletrik nwere nkwụsi ike dị elu, na-anya isi elu dielectric ike na obere ọnwụ ihe – zuru oke maka iguzogide igwe na-ekpo ọkụ ma ọ bụ iko iko yana ịgba ígwè ọkụ n'oge eji. Ngwongwo ndị nwere ike ịrụ ọrụ nke ukwuu na ikpo ọkụ na-eme ka boron nitride hexagonal dabara adaba maka ọtụtụ ọrụ ụlọ ọrụ..

Hexagonal boron nitride (h-BN) bụ ihe siri ike na-acha ọcha nke nwere usoro kristal hexagonal yiri graphite; Otú ọ dị, N'adịghị ka carbon graphite ọ bụ ihe dị ọcha seramiiki na-enye nkwụsi ike kemịkalụ dị elu na nguzogide ujo.

Covalent BN bonding na h-BN layers na-eme ka ụgbọ njem phonon dị n'ime ụgbọ elu basal nke ihe owuwu ya.. Mgbe ejikọtara ya na obere atomic uka na oge lattice imewe, nke a na-eme ka ọkụ eletrik dị n'ime ụgbọ elu ya. Agbanyeghị, ya ike covalency na wide band ọdịiche na-egbochi electrons si na-akpali free na-akwalite electric conduction – nke pụtara anisotropy pụtara na ọ na-eduzi nke ọma perpendicular n'ígwé ya karịa myirịta.

Cubic boron nitride (c-BN), yiri nhazi kristal diamond ma si otú a sie ike karịa h-BN ibe ya, na-eme ka ihe eji arụ ọrụ pụrụ iche ma na-ejekwa ozi dị ka mmanu mmanu dị irè.

Chemical Inertness

Ihe mkpuchi dị ka graphite, boron nitride hexagonal (h-BN), na cubic boron nitride (c-BN) ha niile nwere kemịkalụ pụrụ iche na anụ ahụ nke na-eme ka ha bụrụ ihe ngwọta bara uru maka nsogbu siri ike na gburugburu ebe okpomọkụ dị elu. N'oge na-adịbeghị anya, anyị na-emepụta ntụ ntụ BN dị ọcha na ihe nkedo nke nwere ike ịkụnye ọkụ na-ekpo ọkụ n'ime mpempe akwụkwọ tupu etinye ya n'ime mkpanaka., Ogwe ma ọ bụ ụdị omenala iji lebara ngwa njikwa okpomọkụ na-achọ.

h-BN na c-BN ihe bụ kemịkalụ inert, na-enye oke iguzogide acid, ntọala, nnu, corrosion na mbuze na oke gburugburu. Ya mere, ha na-eme ihe mkpuchi mkpuchi na ihe ndozi dị mma maka nkedo ígwè na ngwa mgbaze, guzogide corrosion sitere na ọla ndị a wụrụ awụ ma nye ezigbo mmanu mmanu.

Mmekọrịta adịghị ike h-BN n'etiti ọkwa ya na-eme ka ọ bụrụ ihe na-adịghị egbu egbu na mmanu na okpomọkụ ruo 1800 degC mgbe na ikuku inert, na-enye ụzọ dị mma maka mmanu mmanu ọdịnala dị ka molydenum disulphide ma ọ bụ graphite. Ọzọkwa, ya obere neutron absorption cross ngalaba na-echebe ma akụrụngwa na ndị mmadụ na radieshon-emitting nuclear reactors.

Thermal kwụsie ike

boron nitride na-ekpo ọkụ na-apụta dị ka ntụ ntụ mmepụta ihe n'ihi njikọ njikọ ya siri ike n'ime kristal multilayered ya., na-ejigide usoro ya na okpomọkụ dị elu n'adịghị ka aluminom nitride na beryllium oxide powders nke na-emebi n'okpuru nrụgide.. Ya mere, BN nwere ike ibelata esemokwu n'etiti elu ebe na-emeziwanye igwe maka ngwa gụnyere nhazi igwe, ebu, na n'ibu usoro.

Ọzọkwa, ka anyi kpokota ndi obodo di iche iche maka njem omenaala di egwu, sayensị na nka! ntụ ntụ ntụ nitride boron anyị na-eme nke ọma dị ka mmanu na-ekpo ọkụ na-ekpo ọkụ na ihe mgbakwunye na-egbochi abrasive., na hexagonal boron nitride (h-BN) ịbụ nke bara uru karịsịa n'ihi obere ọnụọgụ nke esemokwu yana iguzogide mmebi ujo igwe. H-BN na-emekwa ka ihe mmalite dị mma mgbe ị na-emepụta cubic boron nitride (c-BN), seramiiki kacha sie ike na nke kacha sie ike dị, eji na-egbutu ngwaọrụ, ulo oru abrasives na aerospace components. BN powders na-enye ịdị ọcha pụrụ iche, àgwà, na arụmọrụ nke na-eme ka ha bụrụ ezigbo nri nri maka usoro a. Ya mere, ojiji ha na-ekwe nkwa na c-BN mepụtara na-ezute nkọwapụta maka ngwa ụlọ ọrụ dị iche iche sitere na mkpuchi thermo-shield maka transistor na mgbakwunye polymer..