Cov ntsiab lus tseem ceeb hauv ntiaj teb tsis tshua muaj: Dab tsi yog kev siv yttrium oxide hmoov?
Tsis tshua muaj ntiaj teb yog ib qho tseem ceeb tshaj plaws kev pab cuam, thiab nws muaj lub luag hauj lwm irreplaceable nyob rau hauv industrial ntau lawm. Tsheb iav, nuclear magnetic resonance, optical fiber, kua siv lead ua zaub, thiab lwm yam yog inseparable los ntawm qhov sib ntxiv ntawm lub ntiaj teb tsis tshua muaj. Ntawm lawv, yttrium (Y) yog ib qho ntawm cov hlau tsis tshua muaj hauv ntiaj teb thiab yog hom grey hlau. Txawm li cas los xij, vim nws cov ntsiab lus siab hauv lub ntiaj teb crust, tus nqi kuj pheej yig thiab nws yog dav siv.Nyob rau hauv tam sim no kev tsim khoom, nws yog tsuas yog siv nyob rau hauv lub xeev ntawm yttrium alloy thiab yttrium oxide.
Yttrium hlau
Ntawm lawv, yttrium oxide (Y2O3) yog qhov tseem ceeb tshaj plaws yttrium compound. Nws yog insoluble nyob rau hauv dej thiab alkali, soluble nyob rau hauv acid, thiab muaj ib tug zoo li dawb crystalline hmoov (cov qauv siv lead ua belongs rau lub cubic system). Nws muaj tshuaj lom neeg ruaj khov zoo heev thiab nyob hauv lub tshuab nqus tsev. Tsawg volatility, siab kub tsis kam, corrosion kuj, siab dielectric, transparency (infrared) thiab lwm yam zoo, yog li nws tau siv nyob rau hauv ntau lub teb. Dab tsi yog qhov tshwj xeeb? Cia peb saib.
Cov qauv siv lead ua ntawm yttrium oxide
01 Synthesis ntawm yttrium stabilized zirconia hmoov. Cov theem hauv qab no hloov pauv yuav tshwm sim thaum lub caij txias ntawm cov ntshiab ZrO2 los ntawm qhov kub thiab txias mus rau chav tsev kub: cubic theem (c) → tetragonal theem (t) → monoclinic theem (m), qhov twg t yuav tshwm sim ntawm 1150 ° C → m theem hloov, nrog rau qhov ntim expansion ntawm li 5%. Txawm li cas los xij, yog tias t → m theem kev hloov pauv ntawm ZrO2 yog nyob ruaj khov rau hauv chav tsev kub, qhov t → m theem kev hloov pauv yog induced los ntawm kev ntxhov siab thaum thauj khoom.Vim lub ntim nyhuv generated los ntawm cov theem hloov, ib tug loj npaum li cas ntawm tawg zog yog absorbed. , yog li hais tias cov ntaub ntawv nthuav tawm ib qho txawv txav siab tawg zog, kom cov ntaub ntawv nthuav tawm ib qho txawv txav siab tawg toughness, ua rau theem transformation toughness, thiab siab toughness thiab siab hnav tsis kam. poj niam deev.
Txhawm rau ua tiav cov theem hloov pauv ntawm zirconia ceramics, ib qho stabilizer yuav tsum tau ntxiv thiab nyob rau hauv qee qhov kev sib tw, qhov kub-kub ruaj khov theem-tetragonal meta-stabilization rau chav tsev kub, tau txais tetragonal theem uas tuaj yeem hloov pauv ntawm chav sov. . Nws yog stabilizing nyhuv ntawm stabilizers ntawm zirconia. Y2O3 yog qhov tshawb fawb tshaj plaws zirconium oxide stabilizer kom deb li deb.Cov khoom siv sintered Y-TZP muaj cov khoom siv zoo heev ntawm chav tsev kub, lub zog siab, zoo tawg toughness, thiab cov nplej loj ntawm cov khoom hauv nws cov khoom sib sau yog me me thiab zoo li qub, yog li nws muaj attracted ntau dua. 02 Sintering aids Lub sintering ntawm ntau yam tshwj xeeb ceramics yuav tsum muaj kev koom tes ntawm sintering pab. Lub luag haujlwm ntawm cov khoom siv sintering feem ntau tuaj yeem muab faib ua cov hauv qab no: tsim cov tshuaj tov nrog sinter; Tiv thaiv kom tsis txhob siv lead ua daim ntawv hloov pauv; inhibit crystal grain kev loj hlob; ua kua theem. Piv txwv li, nyob rau hauv lub sintering ntawm alumina, magnesium oxide MgO feem ntau ntxiv raws li ib tug microstructure stabilizer thaum lub sij hawm sintering txheej txheem. Nws tuaj yeem kho cov nplej, txo qhov sib txawv ntawm cov qoob loo ciam teb zog, ua rau tsis muaj zog anisotropy ntawm cov qoob loo loj hlob, thiab inhibit qhov kev loj hlob tsis tu ncua. Txij li thaum MgO yog volatile heev ntawm qhov kub thiab txias, thiaj li yuav ua tau zoo, Yttrium oxide feem ntau tov nrog MgO. Y2O3 tuaj yeem ua kom cov khoom siv lead ua kom zoo thiab txhawb nqa sintering densification. 03YAG hmoov hluavtaws yttrium aluminium garnet (Y3Al5O12) yog ib tug neeg tsim compound, tsis muaj tej yam ntuj tso minerals, tsis muaj xim, Mohs hardness ncav cuag 8.5, melting point 1950 ℃, insoluble nyob rau hauv sulfuric acid, hydrochloric acid, nitric acid, hydrofluoric acid, thiab lwm yam. high kub khoom theem txheej txheem yog ib txwm siv rau kev npaj YAG hmoov.Raws li tus piv tau txais nyob rau hauv lub binary theem daim duab ntawm yttrium oxide thiab txhuas oxide, ob lub hmoov sib tov thiab raug rho tawm haujlwm ntawm qhov kub thiab txias, thiab YAG hmoov yog tsim los ntawm cov khoom-theem cov tshuaj tiv thaiv ntawm cov oxides. Nyob rau hauv qhov kub thiab txias, nyob rau hauv cov tshuaj tiv thaiv ntawm alumina thiab yttrium oxide, mesophases YAM thiab YAP yuav raug tsim ua ntej, thiab thaum kawg YAG yuav tsim.
Cov txheej txheem kub-kub-theem rau kev npaj YAG hmoov muaj ntau daim ntawv thov. Piv txwv li, nws daim ntawv cog lus Al-O me me thiab lub zog ntawm daim ntawv cog lus siab. Raws li qhov cuam tshuam ntawm electrons, qhov kev ua haujlwm kho qhov muag tau ruaj khov, thiab kev qhia txog cov ntsiab lus tsis tshua muaj hauv ntiaj teb tuaj yeem txhim kho luminescence kev ua tau zoo ntawm phosphor.Thiab YAG tuaj yeem ua phosphor los ntawm doping nrog trivalent tsawg lub ntiaj teb ions xws li Ce3+ thiab Eu3+. Tsis tas li ntawd, YAG siv lead ua muaj qhov pom zoo, ruaj khov lub cev thiab tshuaj lom neeg, muaj zog txhua yam, thiab zoo thermal creep kuj. Nws yog cov khoom siv laser siv lead ua nrog ntau yam kev siv thiab kev ua haujlwm zoo.
YAG siv lead ua 04 pob tshab ceramic yttrium oxide yeej ib txwm yog qhov kev tshawb fawb tsom hauv kev lag luam pob tshab ceramics. Nws belongs rau lub cubic crystal system thiab muaj cov isotropic optical zog ntawm txhua axis. Piv nrog rau anisotropy ntawm pob tshab alumina, cov duab tsis tshua muaj kev cuam tshuam, yog li Maj mam, nws tau raug nqi thiab tsim los ntawm high-end lo ntsiab muag los yog tub rog optical windows. Cov yam ntxwv tseem ceeb ntawm nws lub cev thiab tshuaj muaj zog yog: ①High melting point, tshuaj lom neeg thiab photochemical stability yog qhov zoo, thiab qhov pom kev pom dav dav (0.23 ~ 8.0μm); ②Ntawm 1050nm, nws qhov ntsuas qhov taw qhia siab yog siab li 1.89, uas ua rau nws muaj kev xa tawm theoretical ntau dua 80%; ③Y2O3 muaj txaus kom haum rau feem ntau Cov kab sib txawv ntawm qhov loj conduction band mus rau valence band ntawm emission theem ntawm trivalent tsis tshua muaj ntiaj teb ions tuaj yeem kho tau zoo los ntawm doping ntawm lub ntiaj teb tsis tshua muaj ions. ; ④ Lub zog phonon tsawg, thiab nws qhov siab tshaj plaws phonon txiav tawm zaus yog li 550cm-1. Lub zog phonon qis tuaj yeem cuam tshuam qhov tshwm sim ntawm qhov tsis muaj hluav taws xob hloov pauv, nce qhov tshwm sim ntawm kev hloov pauv hluav taws xob, thiab txhim kho lub luminescence quantum Efficiency; ⑤ High thermal conductivity, txog 13.6W / (m·K), siab thermal conductivity yog heev
tseem ceeb rau nws raws li cov khoom siv laser nruab nrab.
Yttrium oxide pob tshab ceramics tsim los ntawm Nyiv Kamishima Chemical Company
Lub melting point ntawm Y2O3 yog hais txog 2690 ℃, thiab sintering kub ntawm chav tsev kub yog li 1700 ~ 1800 ℃. Txhawm rau ua kom lub teeb xa hluav taws xob ceramics, nws yog qhov zoo tshaj plaws los siv kub nias thiab sintering. Vim nws lub cev thiab tshuaj lom neeg zoo heev, Y2O3 pob tshab ceramics tau dav siv thiab tsim muaj peev xwm, suav nrog: missile infrared qhov rais thiab domes, pom thiab infrared lo ntsiab muag, high-pressure gas paug teeb, ceramic scintillators, ceramic lasers thiab lwm yam teb.
Post lub sij hawm: Nov-25-2021