Cov Khoom thiab Kev Siv Ntawm Hexagonal Boron Nitride Ceramics

Cov yam ntxwv ntawm Boron Nitride Ceramics

(1) Kev kub siab ua haujlwm

h-BN ceramics yog sublimated ntawm 3000 degree hauv 0.1MPa nitrogen, thiab lub zog ntawm 1800 degree yog ob zaug ntawm chav tsev kub.

(2) High thermal conductivity

Lub thermal conductivity ntawm kub nias h-BN ceramic khoom yog hais txog 33W / m•k, uas zoo ib yam li cov hlau tsis muaj steel, thiab yog ib qho ntawm cov khoom siv thermal conductivity siab tshaj plaws ntawm cov ntaub ntawv ceramic.

(3) Tsawg coefficient ntawm thermal expansion

Lub coefficient ntawm linear expansion ntawm h-BN ceramics yog (2.0~ 6.5) × 10-6 / degree, thib ob tsuas yog quartz iav, thiab yog qhov tsawg tshaj plaws ntawm cov ceramics. Tsis tas li ntawd, nws muaj thermal conductivity, yog li h-BN ceramics yog thermal shock resistant. Kev ua tau zoo heev.

(4) Cov khoom siv hluav taws xob zoo heev

Cov rwb thaiv tsev kub ntawm h-BN ceramics yog qhov zoo. Nws resistivity yog 1014Ω•cm ntawm 25 degree, thiab tuaj yeem ncav cuag 103Ω•cm ntawm 2000 degree. Qhov siab tshaj plaws ntim resistivity ntawm high-purity h-BN ceramics tuaj yeem ncav cuag 1016 ~ 1018Ω•cm, txawm tias nyob rau ntawm 1000 degree kub, tseem muaj 104 ~ 106Ω•cm, uas yog qhov zoo tshaj plaws high-temperature insulating khoom ntawm ceramics.

(5) Zoo corrosion kuj

H-BN ceramics muaj cov tshuaj ruaj khov zoo thiab tsis ntub los ntawm cov hlau molten feem ntau, iav thiab ntsev, yog li lawv muaj kev tiv thaiv corrosion siab rau cov kua qaub, alkalis, molten hlau thiab iav, thiab cov tshuaj zoo inertness.

(6) Tsawg coefficient ntawm kev sib txhuam

h-BN ceramics muaj cov khoom lubricating zoo heev, kev sib txhuam coefficient μ yog 0.16, tsis nce ntawm qhov kub thiab txias, thiab muaj qhov kub thiab txias dua li molybdenum disulfide thiab graphite. Cov cua oxidizing tuaj yeem ncav cuag 900 degree, thiab nws tuaj yeem ncav cuag 2000 degree hauv lub tshuab nqus tsev.

(7) Machinability

h-BN ceramics yog ib qho yooj yim heev rau siv cov pa hlau txiav tshuab kom tiav cov khoom, thiab qhov tseeb tig tuaj yeem ncav cuag 0.05mm, yog li cov khoom uas muaj cov duab nyuaj tuaj yeem ua tiav los ntawm h-BN blanks.

Kev siv Boron Nitride Ceramics

Boron nitride ceramics tuaj yeem hais tias yog cov khoom lag luam tshiab tsim nrog kev txhim kho kev lag luam aviation thiab hluav taws xob, thiab muaj kev thov dav dav hauv kev lag luam metallurgy, tshuaj lom neeg kev lag luam, hluav taws xob thiab lub zog tshiab.

Siv cov khoom siv hluav taws xob zoo kub thiab hluav taws xob rwb thaiv tsev ntawm boron nitride cov khoom, nws tuaj yeem siv los ua cov khoom siv hluav taws xob rwb thaiv tsev ntawm qhov kub thiab txias, thiab muaj thermal shock kuj zoo heev. Siv nws cov thermal conductivity thiab nkag mus rau microwave hluav taws xob, nws tuaj yeem siv los ua lub qhov rais xa mus rau radar hauv kev lag luam hluav taws xob. Siv lub siab melting point, me me thermal expansion coefficient thiab ruaj khov kev ua tau zoo ntawm yuav luag tag nrho cov hlau molten, h-BN cov khoom yuav siv tau raws li high-temperature hlau smelting crucibles, cov ntaub ntawv kub-resistant, kub dab dej thiab cov khoom siv cua sov. Siv qhov zoo tshaj plaws thermal stability ntawm h-BN ceramics, nws tuaj yeem siv nyob rau hauv qhov rov ua kom txias thiab ceev cua sov los ntawm 1500 degree mus rau chav tsev kub.

Siv qhov zoo corrosion kuj ntawm h-BN ceramics rau acid, alkali thiab iav slag, thiab kev ua tau zoo ntawm tsis ntub dej los yog tshuaj tiv thaiv rau feem ntau molten hlau, nws yuav siv tau raws li ib tug crucible rau melting non-ferrous hlau, precious hlau thiab tsis tshua muaj hlau. , nkoj, kav dej, xa cov twj thiab lwm yam khoom. Kev siv h-BN ceramics tsis yog tsuas yog ib qho zoo ntawm cov cua sov, tab sis kuj yog ib qho hluav taws xob insulator, thiab tuaj yeem siv los ua cov khoom siv hluav taws xob ultra-siab kub insulating. Kev siv h-BN ceramics yog pob tshab rau microwaves thiab infrared rays, thiab tuaj yeem siv los ua lub qhov rais rau infrared thiab microwave kis tau tus mob, xws li radar windows.

Kev siv cov ceramics muaj lub peev xwm nqus neutron muaj zog, thiab tuaj yeem sib xyaw nrog ntau yam yas thiab graphite hauv kev lag luam atomic zog raws li cov khoom siv tiv thaiv rau atomic pawg. Siv h-BN ceramics muaj thermal stability, tshuaj stability thiab hluav taws xob rwb thaiv tsev, thiab kuj muaj cov yam ntxwv ntawm high thermal conductivity, zoo dielectric zog, thiab yooj yim ua ntawm cov khoom, thiab yuav ua ke nrog TiB2 los npaj conductive ceramic evaporation nkoj.

Tsis tas li ntawd, h-BN muaj kev ua haujlwm ruaj khov nyob rau hauv ultra-siab siab thiab tuaj yeem siv los ua cov khoom siv sib kis thiab ntim. Kev siv h-BN yog cov khoom siv hluav taws xob zoo tshaj plaws, uas tuaj yeem siv los ua cov khoom siv hluav taws xob kub kub rau cov dav hlau thiab cov dav hlau. Siv lub luminescence ntawm h-BN, nws tuaj yeem siv los ua cov khoom siv electroluminescent.

Feem ntau, ntau theem ntawm hexagonal boron nitride hais (nanoscale, ob peb micron-scale, kaum ntawm micron-scale hais) muaj ntau yam kev siv. Ntawm lawv, nano-sized particles muaj me me particle loj thiab zoo lubrication, thiab yuav siv nyob rau hauv lubricating roj additives, tshuaj pleev ib ce thiab lwm yam lag luam; ob peb micron me me hais muaj cua sov zoo, tsis tshua muaj thermal expansion coefficient, thiab hluav taws xob rwb thaiv tsev zoo, thiab yuav siv rau hauv cov txheej txheem kub-resistant thiab hluavtaws cubic nitrogen. Boronization, kev npaj tshwj xeeb ceramics thiab lwm yam kev lag luam; kaum ob ntawm micron-loj hais muaj cov thermal conductivity zoo thiab cov khoom siv tshuaj ruaj khov, thiab yuav siv rau hauv cov khoom siv thermal conductive, cov khoom siv hauv aerospace, cov khoom siv hluav taws xob thiab lwm yam.

Shengyang New Material Co., Ltd. tau cog lus rau kev tsim cov boron nitride thiab boron nitride ua cov khoom, thiab tuaj yeem kho ntau yam boron nitride insulating ceramic qhov chaw raws li cov neeg siv khoom xav tau. Tiv tauj peb yog tias tsim nyog.

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