Boron carbide yog cov siv lead ua dub nrog cov xim hlau, tseem hu ua pob zeb diamond dub, uas belongs rau cov ntaub ntawv uas tsis yog xim hlau.Tam sim no, txhua leej txhua tus paub txog cov khoom ntawm boron carbide, uas tej zaum yuav yog vim daim ntawv thov ntawm mos mos armor, vim hais tias nws muaj qhov tsawg tshaj plaws ceev ntawm cov ntaub ntawv ceramic, muaj qhov zoo ntawm siab elastic modulus thiab siab hardness, thiab muaj peev xwm ua tau zoo siv. ntawm micro-pob txha kom nqus tau qhov projectiles.Cov nyhuv ntawm lub zog, thaum khaws cov load kom tsawg li sai tau.Tab sis qhov tseeb, boron carbide muaj ntau lwm yam khoom tshwj xeeb, uas tuaj yeem ua lub luag haujlwm tseem ceeb hauv cov khoom abrasives, refractory khoom, nuclear kev lag luam, aerospace thiab lwm yam kev lag luam.
Cov khoom ntawmboron carbide
Nyob rau hauv cov nqe lus ntawm lub cev lub zog, lub hardness ntawm boron carbide tsuas yog tom qab pob zeb diamond thiab cubic boron nitride, thiab nws tseem muaj peev xwm tswj tau lub zog ntawm high kub, uas yuav siv tau raws li ib tug zoo tagnrho high-temperature hnav-resistant khoom;Qhov ntom ntawm boron carbide yog qhov me me (qhov kev xav tau tsuas yog 2.52 g / cm3), sib zog dua li cov khoom siv ceramic, thiab tuaj yeem siv rau hauv aerospace teb;boron carbide muaj peev xwm nqus neutron muaj zog, zoo thermal stability, thiab melting point ntawm 2450 ° C, yog li nws kuj tau siv dav hauv kev lag luam nuclear.Lub peev xwm nqus neutron ntawm neutron tuaj yeem txhim kho ntxiv los ntawm kev ntxiv B ntsiab lus;boron carbide cov ntaub ntawv nrog cov morphology tshwj xeeb thiab cov qauv kuj muaj cov khoom tshwj xeeb photoelectric;Nyob rau hauv tas li ntawd, boron carbide muaj ib tug siab melting point, siab elastic modulus, tsis tshua muaj expansion coefficient thiab zoo Cov zoo no ua rau nws muaj peev xwm siv cov ntaub ntawv nyob rau hauv ntau yam xws li metallurgy, tshuaj lom neeg kev lag luam, machinery, aerospace thiab tub rog kev lag luam.Piv txwv li, corrosion-resistant thiab hnav-resistant qhov chaw, ua bulletproof armor, reactor tswj rods thiab thermoelectric ntsiab, thiab lwm yam.
Hais txog cov khoom siv tshuaj, boron carbide tsis hnov mob nrog acids, alkalis thiab feem ntau inorganic tebchaw nyob rau hauv chav tsev kub, thiab tsis tshua muaj reacts nrog oxygen thiab halogen gases nyob rau hauv chav tsev kub, thiab nws cov tshuaj muaj pes tsawg leeg yog ruaj khov.Tsis tas li ntawd, boron carbide hmoov yog qhib los ntawm halogen ua tus neeg sawv cev steel, thiab boron yog infiltrated rau saum npoo ntawm cov hlau los tsim cov hlau boride zaj duab xis, yog li txhim kho lub zog thiab hnav tsis kam ntawm cov khoom, thiab nws cov khoom siv tshuaj zoo heev.
Peb txhua tus paub tias qhov xwm txheej ntawm cov khoom txiav txim siab siv, yog li hauv daim ntawv thov twg boron carbide hmoov muaj kev ua tau zoo?Cov engineers ntawm R & D center ntawmUrbanMines Tech.Co., Ltd. ua cov ntsiab lus hauv qab no.
Daim ntawv thov ntawmboron carbide
1. Boron carbide yog siv los ua polishing abrasive
Daim ntawv thov ntawm boron carbide ua abrasive yog tsuas yog siv rau kev sib tsoo thiab polishing ntawm sapphire.Ntawm cov ntaub ntawv superhard, lub hardness ntawm boron carbide yog zoo dua li ntawm aluminium oxide thiab silicon carbide, thib ob tsuas yog pob zeb diamond thiab cubic boron nitride.Sapphire yog cov khoom siv zoo tshaj plaws rau cov khoom siv hluav taws xob semiconductor GaN / Al 2 O3 lub teeb-emitting diodes (LEDs), kev sib txuas loj loj SOI thiab SOS, thiab superconducting nanostructure films.Lub smoothness ntawm qhov saum npoo yog siab heev thiab yuav tsum yog ultra-nqus Tsis muaj degree ntawm kev puas tsuaj.Vim lub zog siab thiab siab tawv ntawm sapphire siv lead ua (Mohs hardness 9), nws tau coj teeb meem loj rau kev ua lag luam.
Los ntawm kev xav ntawm cov ntaub ntawv thiab kev sib tsoo, cov ntaub ntawv zoo tshaj plaws rau kev ua thiab sib tsoo sapphire siv lead ua yog cov pob zeb hluavtaws, boron carbide, silicon carbide, thiab silicon dioxide.Lub hardness ntawm dag pob zeb diamond yog siab dhau (Mohs hardness 10) thaum sib tsoo lub sapphire wafer, nws yuav khawb qhov nto, cuam tshuam lub teeb transmittance ntawm lub wafer, thiab tus nqi yog kim;Tom qab txiav silicon carbide, qhov roughness RA feem ntau yog siab thiab flatness tsis zoo;Txawm li cas los xij, qhov nyuaj ntawm silica tsis txaus (Mohs hardness 7), thiab lub zog sib tsoo tsis zoo, uas yog siv sijhawm ntev thiab siv zog ntau hauv cov txheej txheem sib tsoo.Yog li ntawd, boron carbide abrasive (Mohs hardness 9.3) tau dhau los ua cov khoom siv zoo tshaj plaws rau kev ua thiab sib tsoo sapphire siv lead ua, thiab muaj kev ua tau zoo hauv ob sab sib tsoo ntawm sapphire wafers thiab rov qab thinning thiab polishing ntawm sapphire-based LED epitaxial wafers.
Nws yog ib qho tsim nyog hais tias thaum boron carbide siab tshaj 600 ° C, qhov saum npoo yuav oxidized rau hauv B2O3 zaj duab xis, uas yuav soften nws mus rau ib qho twg, yog li nws tsis haum rau qhuav sib tsoo ntawm qhov kub thiab txias hauv daim ntawv thov abrasive, tsuas yog tsim nyog. rau polishing kua grind.Txawm li cas los xij, cov cuab yeej no tiv thaiv B4C los ntawm kev oxidized ntxiv, ua rau nws muaj qhov zoo tshwj xeeb hauv kev siv cov ntaub ntawv refractory.
2. Kev siv cov khoom siv refractory
Boron carbide muaj cov yam ntxwv ntawm kev tiv thaiv oxidation thiab kub tsis kam.Nws feem ntau yog siv los ua cov khoom zoo li qub thiab tsis zoo li cov ntaub ntawv refractory thiab yog dav siv nyob rau hauv ntau yam ntawm metallurgy, xws li steel qhov cub thiab kiln rooj tog.
Nrog cov kev xav tau ntawm kev txuag hluav taws xob thiab kev txo qis hauv kev lag luam hlau thiab hlau thiab smelting ntawm cov pa roj carbon tsawg thiab ultra-low carbon steel, kev tshawb fawb thiab kev loj hlob ntawm tsawg-carbon magnesia-carbon bricks (feem ntau <8% carbon ntsiab lus) nrog kev ua tau zoo heev tau nyiam ntau thiab ntau dua los ntawm kev lag luam hauv tsev thiab txawv teb chaws.Tam sim no, kev ua tau zoo ntawm cov pa roj carbon tsawg-magnesia-carbon cib feem ntau yog txhim kho los ntawm kev txhim kho cov qauv sib txuas, ua kom zoo dua cov qauv ntawm cov hlau nplaum-carbon cib, thiab ntxiv cov tshuaj tiv thaiv kab mob siab.Ntawm lawv, graphitized carbon tsim los ntawm qib industrial-qib boron carbide thiab ib nrab graphitized carbon dub yog siv.Cov hmoov sib xyaw dub, siv los ua cov pa roj carbon monoxide thiab antioxidant rau cov pa roj carbon tsawg-magnesia-carbon cib, tau ua tiav cov txiaj ntsig zoo.
Txij li thaum boron carbide yuav soften rau qee qhov ntawm qhov kub thiab txias, nws tuaj yeem txuas rau saum npoo ntawm lwm cov khoom siv.Txawm hais tias cov khoom yog densified, B2O3 oxide zaj duab xis nyob rau saum npoo tuaj yeem tsim muaj kev tiv thaiv thiab ua lub luag haujlwm tiv thaiv oxidation.Nyob rau tib lub sij hawm, vim hais tias cov columnar crystals generated los ntawm cov tshuaj tiv thaiv yog muab faib nyob rau hauv lub matrix thiab qhov khoob ntawm cov khoom refractory, lub porosity yog txo, qhov nruab nrab kub lub zog yog zoo dua, thiab lub ntim ntawm generated crystals expands, uas yuav kho tau ntim. shrinkage thiab txo cov kab nrib pleb.
3. Cov ntaub ntawv mos mos siv los txhim kho lub teb chaws tiv thaiv
Vim nws qhov siab hardness, siab zog, me me lub ntiajteb txawj nqus, thiab qib siab ntawm ballistic tsis kam, boron carbide tshwj xeeb tshaj yog nyob rau hauv txoj kab nrog cov qauv ntawm cov khoom siv mos mos mos.Nws yog cov khoom siv mos mos zoo tshaj plaws rau kev tiv thaiv dav hlau, tsheb, armor, thiab tib neeg lub cev;tam sim no,Qee lub tebchawstau tshaj tawm cov nqi qis boron carbide anti-ballistic armor kev tshawb fawb, aiming los txhawb kev loj-scale siv boron carbide anti-ballistic armor nyob rau hauv kev tiv thaiv kev lag luam.
4. Daim ntawv thov hauv kev lag luam nuclear
Boron carbide muaj lub siab neutron absorption cross-section thiab dav neutron zog spectrum, thiab tau lees paub thoob ntiaj teb tias yog qhov zoo tshaj plaws neutron absorber rau kev lag luam nuclear.Ntawm lawv, qhov thermal seem ntawm boron-10 isotope siab li 347 × 10-24 cm2, thib ob tsuas yog rau ob peb lub ntsiab lus xws li gadolinium, samarium, thiab cadmium, thiab yog cov thermal neutron absorber zoo.Tsis tas li ntawd, boron carbide yog nplua nuj nyob rau hauv cov kev pab cuam, corrosion-resistant, zoo thermal stability, tsis tsim radioactive isotopes, thiab tsis tshua muaj hluav taws xob hluav taws xob hluav taws xob, yog li boron carbide yog dav siv los tswj cov ntaub ntawv thiab shielding cov ntaub ntawv nyob rau hauv nuclear reactors.
Piv txwv li, hauv kev lag luam nuclear, qhov kub-kub roj-txias reactor siv boron absorbing ball shutdown system raws li qhov thib ob kaw.Nyob rau hauv rooj plaub uas muaj kev huam yuaj, thaum lub kaw lus kaw thawj zaug tsis ua hauj lwm, qhov thib ob kaw system siv ib tug loj tus naj npawb ntawm boron carbide pellets Dawb poob rau hauv lub channel ntawm lub reflective txheej ntawm lub reactor core, thiab lwm yam, kom kaw lub reactor thiab paub qhov txias. kaw, nyob rau hauv lub absorbing pob yog graphite pob uas muaj boron carbide.Lub luag haujlwm tseem ceeb ntawm boron carbide core nyob rau hauv qhov kub thiab txias ntawm cov roj reactor yog tswj lub zog thiab kev nyab xeeb ntawm lub reactor.Cov pa roj carbon cib yog impregnated nrog boron carbide neutron absorbing khoom, uas tuaj yeem txo cov neutron irradiation ntawm lub reactor siab hlab ntsha.
Tam sim no, boride cov ntaub ntawv rau nuclear reactors feem ntau suav nrog cov ntaub ntawv hauv qab no: boron carbide (tswj rods, shielding rods), boric acid (moderator, coolant), boron steel (tswj rods thiab cia khoom rau nuclear roj thiab nuclear pov tseg), boron Europium. (core burnable lom khoom), thiab lwm yam.