Kab lus no luv luv piav qhia ib txoj kev los txhim kho lub neej ntawm boron nitride nozzles, muab los ntawm cov ntawv tshawb fawb los ntawm Li Bei thiab Guo Fengping. Los ntawm kev tso Si txheej hauv BN nozzle thiab tom qab ntawd kho nws ntawm qhov kub ntawm qhov chaw siab tshaj qhov cua nitrogen, cov xim txheej Si3N4 ntom ntom nti nrog qee qhov tuab yog thaum kawg tsim sab hauv lub pob taws. Si3N4 muaj Mohs nyuaj ntawm 9-9.5 thiab lub zog thermal nthuav coefficient ntawm 2.75 × 10-6 / ° C, uas yog sib xws nrog hexagonal BN matrix. Si3N4 Silicon Nitride ceramic muaj qhov kub thiab txias zoo tshaj qhov ua cov tshuab, yaig tsis kam, hnav tsis kam, ua hauj corrosion, thiab oxidation tsis kam. Nws tuaj yeem tiv thaiv BN nozzles los ntawm oxidation thiab xyuas kom meej tias lub neej ntawm lub nozzle yog zoo heev.
Hauv cov txheej txheem txau Fe-based amorphous alloy strips (muaj Fe, Si, B), hexagonal boron nitride nozzle tau sib cuag nrog lub siab kub (& gt; 1,300 ° C) thiab siab siab yaj, thiab saum npoo yog oxidized tiag, thiab cov boron oxide (B2O3) yog cov iav yaj, cov khoom no softens ntawm 450 ° C thiab dhau los ua kua dej ua kua ntawm 600 ° C. Raws li kev cuam tshuam ntawm kev sib tw hauv siab-yaj, boron oxide yooj yim muab tshuab, thiab lub puab diam ntawm nozzle nthuav dav, uas ua rau tsis ua haujlwm. Txhawm rau daws qhov teeb meem no, Li Bei thiab Guo Fengping npaj hom qauv hauv qab no.
Txhawm rau txhawm rau ncua kev pab lub neej ntawm BN ceramic nozzle, los ntawm kev tso Si txheej hauv BN nozzle thiab tom qab ntawd kho nws ntawm qhov kub siab hauv cov pa nitrogen, qhov kev hloov pauv tshwm sim: 3Si+2N2 = a -Si3N4. Thaum kawg, txheej tuab ntawm Si3N4 txheej nrog qee qhov tuab yog tsim hauv sab hauv, tsis muaj txheej txheej txheej zoo dua, thiab cov txheej txheem nthuav dav yog qhov sib luag. Qhov tso nyiaj npaum li cas ntawm Si3N4 txheej yog 0.15 ~ 0.20mm, qhov tso nyiaj ntau dua yuav ua rau cov txheej xim yooj yim kom poob, qhov tso nyiaj tsawg dua yuav tsis tiv taus qhov yaig. Kev ntsuas kub yog 900 ~ 1,000 ° C. Lub sijhawm ua tiav yog 0.5 ~ 1.5 teev kom paub tseeb tias cov nyhuv tua.
