Boron carbide yog ib lub siv lead ua dub nrog cov xim hlau ci ntsa iab, tseem hu ua pob zeb diamond dub, uas yog cov khoom siv inorganic non-metallic. Tam sim no, txhua tus neeg paub txog cov khoom siv ntawm boron carbide, uas tej zaum yuav yog vim siv cov cuab yeej tiv thaiv mos txwv, vim nws muaj qhov ceev qis tshaj plaws ntawm cov khoom siv ceramic, muaj qhov zoo ntawm cov modulus elastic siab thiab qhov nyuaj siab, thiab tuaj yeem ua tiav kev siv micro-fracture zoo los nqus cov projectiles. Cov nyhuv ntawm lub zog, thaum khaws cov khoom thauj tsawg li sai tau. Tab sis qhov tseeb, boron carbide muaj ntau lwm yam khoom tshwj xeeb, uas tuaj yeem ua rau nws ua lub luag haujlwm tseem ceeb hauv abrasives, cov ntaub ntawv refractory, kev lag luam nuclear, aerospace thiab lwm yam teb.
Cov khoom ntawmboron carbide
Hais txog cov khoom siv lub cev, qhov nyuaj ntawm boron carbide tsuas yog tom qab pob zeb diamond thiab cubic boron nitride, thiab nws tseem tuaj yeem tswj tau lub zog siab ntawm qhov kub siab, uas tuaj yeem siv ua cov khoom siv tiv taus kub zoo tagnrho; qhov ceev ntawm boron carbide yog me heev (qhov ceev theoretical tsuas yog 2.52 g / cm3), sib dua li cov ntaub ntawv ceramic ib txwm muaj, thiab tuaj yeem siv rau hauv thaj chaw aerospace; boron carbide muaj peev xwm nqus neutron muaj zog, thermal stability zoo, thiab lub ntsiab lus yaj ntawm 2450 ° C, yog li nws kuj tseem siv dav hauv kev lag luam nuclear. Lub peev xwm nqus neutron ntawm neutron tuaj yeem txhim kho ntxiv los ntawm kev ntxiv cov ntsiab lus B; cov ntaub ntawv boron carbide nrog cov qauv morphology thiab cov qauv tshwj xeeb kuj muaj cov khoom tshwj xeeb photoelectric; ntxiv rau, boron carbide muaj lub ntsiab lus yaj siab, modulus siab elastic, coefficient nthuav dav qis thiab zoo Cov txiaj ntsig no ua rau nws yog cov khoom siv thov hauv ntau qhov chaw xws li metallurgy, kev lag luam tshuaj lom neeg, tshuab, aerospace thiab kev lag luam tub rog. Piv txwv li, cov khoom tiv taus corrosion thiab hnav-resistant, ua cov cuab yeej tiv thaiv bulletproof, reactor tswj rods thiab thermoelectric ntsiab lus, thiab lwm yam.
Hais txog cov khoom siv tshuaj lom neeg, boron carbide tsis tshua muaj zog nrog cov kua qaub, alkalis thiab feem ntau cov tshuaj inorganic ntawm chav sov, thiab tsis tshua muaj zog nrog cov pa oxygen thiab halogen gases ntawm chav sov, thiab nws cov khoom siv tshuaj lom neeg ruaj khov. Tsis tas li ntawd, hmoov boron carbide raug ua haujlwm los ntawm halogen ua tus neeg sawv cev hlau boriding, thiab boron nkag mus rau ntawm qhov chaw ntawm hlau los tsim cov yeeb yaj kiab hlau boride, yog li ua kom lub zog thiab kev hnav tsis kam ntawm cov khoom siv, thiab nws cov khoom siv tshuaj lom neeg zoo heev.
Peb txhua tus paub tias qhov xwm txheej ntawm cov khoom siv txiav txim siab siv, yog li ntawd, cov hmoov boron carbide muaj kev ua tau zoo tshaj plaws hauv cov ntawv thov twg?Cov engineers ntawm R & D center ntawmUrbanMines Tech.Co., Ltd. tau ua cov lus qhia luv luv hauv qab no.
Daim ntawv thov ntawmboron carbide
1. Boron carbide yog siv los ua polishing abrasive
Kev siv boron carbide ua abrasive feem ntau yog siv rau kev sib tsoo thiab polishing ntawm sapphire. Ntawm cov ntaub ntawv superhard, qhov nyuaj ntawm boron carbide 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 semiconductor GaN / Al 2 O3 lub teeb-emitting diodes (LEDs), cov voj voog loj SOI thiab SOS, thiab cov yeeb yaj kiab superconducting nanostructure. Qhov du ntawm qhov chaw yog siab heev thiab yuav tsum yog ultra-smooth Tsis muaj qib kev puas tsuaj. Vim yog lub zog siab thiab qhov nyuaj ntawm sapphire siv lead ua (Mohs hardness 9), nws tau coj teeb meem loj rau cov lag luam ua tiav.
Los ntawm qhov pom ntawm cov ntaub ntawv thiab kev sib tsoo, cov ntaub ntawv zoo tshaj plaws rau kev ua thiab sib tsoo sapphire crystals yog pob zeb diamond hluavtaws, boron carbide, silicon carbide, thiab silicon dioxide. Qhov nyuaj ntawm pob zeb diamond dag siab dhau (Mohs hardness 10) thaum sib tsoo sapphire wafer, nws yuav khawb qhov chaw, cuam tshuam rau lub teeb transmittance ntawm wafer, thiab tus nqi kim heev; tom qab txiav silicon carbide, qhov roughness RA feem ntau siab thiab qhov tiaj tiaj 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 thiab ua haujlwm 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 crystals, thiab muaj kev ua tau zoo heev hauv kev sib tsoo ob sab ntawm sapphire wafers thiab rov qab thinning thiab polishing ntawm sapphire-based LED epitaxial wafers.
Nws tsim nyog hais tias thaum boron carbide kub tshaj 600 ° C, qhov chaw yuav raug oxidized rau hauv zaj duab xis B2O3, uas yuav ua rau nws mos rau qee qhov, yog li nws tsis haum rau kev sib tsoo qhuav ntawm qhov kub siab dhau hauv cov ntawv thov abrasive, tsuas yog haum rau polishing kua sib tsoo. Txawm li cas los xij, cov khoom no tiv thaiv B4C los ntawm kev raug oxidized ntxiv, ua rau nws muaj qhov zoo tshwj xeeb hauv kev siv cov ntaub ntawv refractory.
2. Daim ntawv thov rau cov ntaub ntawv refractory
Boron carbide muaj cov yam ntxwv ntawm kev tiv thaiv oxidation thiab kev kub siab. Nws feem ntau yog siv ua cov khoom siv refractory zoo li qub thiab tsis zoo li qub, thiab siv dav hauv ntau qhov chaw ntawm metallurgy, xws li cov qhov cub hlau thiab cov rooj tog hauv qhov cub.
Nrog rau qhov xav tau kev txuag hluav taws xob thiab txo kev siv nyiaj hauv kev lag luam hlau thiab hlau thiab kev sib xyaw cov hlau uas muaj carbon tsawg thiab cov hlau uas muaj carbon tsawg heev, kev tshawb fawb thiab kev tsim cov cib magnesia-carbon uas muaj carbon tsawg (feem ntau <8% carbon) nrog kev ua tau zoo heev tau nyiam ntau dua thiab ntau dua los ntawm kev lag luam hauv tsev thiab txawv teb chaws. Tam sim no, kev ua tau zoo ntawm cov cib magnesia-carbon uas muaj carbon tsawg feem ntau tau txhim kho los ntawm kev txhim kho cov qauv carbon sib txuas, kev ua kom zoo dua cov qauv matrix ntawm cov cib magnesia-carbon, thiab ntxiv cov tshuaj antioxidants ua haujlwm siab. Ntawm lawv, cov pa roj carbon graphitized uas muaj cov boron carbide qib kev lag luam thiab ib feem graphitized carbon dub yog siv. Cov hmoov dub sib xyaw, siv ua cov pa roj carbon thiab antioxidant rau cov cib magnesia-carbon uas muaj carbon tsawg, tau ua tiav cov txiaj ntsig zoo.
Vim tias boron carbide yuav mos rau qee qhov ntawm qhov kub siab, nws tuaj yeem txuas rau ntawm qhov chaw ntawm lwm cov khoom siv. Txawm tias cov khoom tau densified, zaj duab xis B2O3 oxide ntawm qhov chaw tuaj yeem tsim qee yam kev tiv thaiv thiab ua lub luag haujlwm tiv thaiv oxidation. Tib lub sijhawm, vim tias cov siv lead ua ke tsim los ntawm cov tshuaj tiv thaiv tau faib rau hauv lub matrix thiab qhov sib txawv ntawm cov khoom siv refractory, qhov porosity raug txo qis, lub zog kub nruab nrab tau zoo dua, thiab qhov ntim ntawm cov siv lead ua tsim tau nthuav dav, uas tuaj yeem kho qhov ntim shrinkage thiab txo cov kab nrib pleb.
3. Cov khoom siv tiv thaiv mos txwv siv los txhim kho kev tiv thaiv lub teb chaws
Vim nws qhov nyuaj siab, lub zog siab, qhov hnyav me me, thiab qib siab ntawm kev tiv thaiv ballistic, boron carbide tshwj xeeb tshaj yog nyob rau hauv kab nrog cov qauv ntawm cov khoom siv tiv thaiv mos txwv. Nws yog cov khoom siv tiv thaiv mos txwv zoo tshaj plaws rau kev tiv thaiv dav hlau, tsheb, riam phom, thiab lub cev tib neeg; tam sim no,Qee lub tebchawstau tawm tswv yim txog kev tshawb fawb txog cov cuab yeej tiv thaiv ballistic boron carbide uas pheej yig, lub hom phiaj yog txhawb kev siv cov cuab yeej tiv thaiv ballistic boron carbide ntau hauv kev lag luam tiv thaiv.
4. Daim ntawv thov hauv kev lag luam nuclear
Boron carbide muaj qhov siab ntawm kev nqus neutron thiab lub zog neutron dav dav, thiab tau lees paub thoob ntiaj teb tias yog qhov nqus neutron zoo tshaj plaws rau kev lag luam nuclear. Ntawm lawv, qhov thermal section ntawm boron-10 isotope yog siab txog 347 × 10-24 cm2, thib ob tsuas yog ob peb yam xws li gadolinium, samarium, thiab cadmium, thiab yog qhov nqus neutron thermal zoo. Tsis tas li ntawd, boron carbide muaj ntau yam khoom siv, tiv taus corrosion, thermal stability zoo, tsis tsim cov isotopes radioactive, thiab muaj lub zog qis dua, yog li boron carbide siv dav ua cov khoom siv tswj thiab cov ntaub ntawv tiv thaiv hauv nuclear reactors.
Piv txwv li, hauv kev lag luam nuclear, lub reactor txias nrog roj kub siab siv lub pob boron absorbing ua lub kaw lus kaw thib ob. Yog tias muaj xwm txheej, thaum lub kaw lus kaw thawj zaug tsis ua haujlwm, lub kaw lus kaw thib ob siv ntau cov pellets boron carbide poob dawb rau hauv cov channel ntawm cov txheej reflective ntawm lub reactor core, thiab lwm yam, kom kaw lub reactor thiab ua tiav qhov kaw txias, qhov twg lub pob absorbing yog lub pob graphite uas muaj boron carbide. Lub luag haujlwm tseem ceeb ntawm lub boron carbide core hauv lub reactor txias nrog roj kub siab yog los tswj lub zog thiab kev nyab xeeb ntawm lub reactor. Lub cib carbon yog impregnated nrog cov khoom siv nqus neutron boron carbide, uas tuaj yeem txo qhov neutron irradiation ntawm lub reactor pressure vessel.
Tam sim no, cov ntaub ntawv boride rau cov reactors nuclear feem ntau suav nrog cov ntaub ntawv hauv qab no: boron carbide (cov pas nrig tswj, cov pas nrig tiv thaiv), boric acid (moderator, coolant), boron steel (cov pas nrig tswj thiab cov ntaub ntawv khaws cia rau roj nuclear thiab cov khib nyiab nuclear), boron Europium (cov khoom siv lom uas hlawv tau), thiab lwm yam.