Dab tsi yog qhov txawv ntawm alumina ceramics thiab corundum?

Alumina ceramic pas nrig

1. Alumina ceramics;

Alumina ceramics yog cov khoom siv ceramic nrog alumina (Al2O3) ua lub cev tseem ceeb, siv rau cov yeeb yaj kiab tuab ua ke. Alumina ceramics muaj zoo conductivity, txhua yam muaj zog thiab kub tsis kam. Nws yuav tsum tau muab sau tseg tias yuav tsum tau ntxuav ultrasonic. Alumina ceramics yog ib hom ceramics nrog ntau yam kev siv. Vim nws qhov kev ua tau zoo tshaj plaws, nws tau dhau los ua ntau thiab siv ntau dua hauv lub neej niaj hnub kom tau raws li qhov xav tau ntawm kev siv niaj hnub thiab kev ua haujlwm tshwj xeeb.

Alumina ceramic tube

High-purity alumina ceramics yog cov khoom siv ceramic nrog cov ntsiab lus Al2O3 ntau dua 99.9%. Vim tias lawv cov sintering kub yog siab li 1650-1990 ℃, thiab kev sib kis wavelength yog 1 mus rau 6 μm, lawv feem ntau yog ua los ntawm molten iav los hloov platinum crucibles; siv nws lub teeb kis tau tus mob Nws tuaj yeem siv los ua lub teeb sodium teeb lub raj, thiab nws tuaj yeem siv los ua ib qho kev sib xyaw ua ke hauv substrate thiab cov khoom siv hluav taws xob ntau zaus hauv kev lag luam hluav taws xob.

Ordinary alumina ceramics raug faib ua 99 plooj (porcelain), 95 plooj (porcelain), 90 plooj (porcelain), 85 plooj (porcelain) thiab lwm yam ntau yam raws li cov ntsiab lus sib txawv ntawm Al2O3. Qee zaum cov uas muaj 80% lossis 75% Al2O3 cov ntsiab lus kuj tau muab cais ua cov alumina ceramics zoo tib yam. Ntawm lawv, 99 alumina plooj (porcelain) yog siv los ua cov khoom siv kub kub, cov tub rauv refractory thiab cov ntaub ntawv tshwj xeeb hnav-tiv taus, xws li cov kabmob ceramic, cov ntsaws ruaj ruaj ceramic thiab dej valve discs; 95 alumina porcelain feem ntau yog siv los ua corrosion-resistant thiab hnav-resistant qhov chaw; 85 plooj (porcelain) Vim tias nws feem ntau sib xyaw nrog qee qhov talc, qhov kev ua tau zoo ntawm hluav taws xob thiab kev ua haujlwm zoo dua qub, thiab nws tuaj yeem raug kaw nrog cov hlau xws li molybdenum, niobium, thiab tantalum, thiab qee qhov yog siv los ua hluav taws xob nqus khoom.

2. Corundum;

Corundum, uas nws lub npe los ntawm Is Nrias teb, yog ib lub npe mineralogical. Muaj peb lub ntsiab sib txawv ntawm qhov sib xws ntawm corundum Al2O3, uas yog α-Al2O3, β-Al2O3, thiab γ-Al2O3. Lub hardness ntawm corundum yog thib ob tsuas yog pob zeb diamond. Corundum feem ntau yog siv rau qib high-grade abrasive cov ntaub ntawv, ceramic bearing cov ntaub ntawv rau watches thiab precision ceramic machinery. Ruby-based dag siv lead ua ua cov khoom siv laser emitting. Rubies thiab sapphires yog ob qho tib si corundum minerals. Tsuas yog cov nyhuv ntawm lub hnub qub, tsuas yog cov pob tshab-pob tshab thiab ci xim corundum tuaj yeem siv ua pob zeb diamonds. Cov xim liab yog hu ua ruby, thaum lwm cov xim ntawm corundum yog sib sau ua ke hu ua sapphire hauv kev lag luam.

Lub npe Corundum yog muab los ntawm Is Nrias teb thiab yog ib lub npe mineralogical. Cov gemologically tsim nyog sawv daws yuav hu ua Ruby thiab Sapphire. Myanmar, Sri Lanka, Thaib, Nyab Laj, thiab Cambodia yog cov khoom tseem ceeb tshaj plaws ntawm cov khoom zoo siab rubies thiab sapphires hauv ntiaj teb. Lwm lub tebchaws tsim muaj xws li Tuam Tshoj, Australia, Tebchaws Meskas, thiab Tanzania.

Corundum yog ib lub pov haum tsim los ntawm cov muaju ntawm alumina (Al2O3). Corundum tov nrog hlau chromium yog ci liab thiab feem ntau hu ua ruby; thaum xiav lossis xim tsis muaj xim corundum feem ntau muab cais ua sapphire.

Corundum nyob qib 9 hauv Mohs hardness rooj. Qhov tshwj xeeb lub ntiajteb txawj nqus yog 4.00, thiab nws muaj hexagonal kem lattice qauv. Nrog lub hardness ntawm corundum thiab nws tus nqi qis dua pob zeb diamond, nws tau dhau los ua cov khoom zoo rau cov ntawv xuab zeb thiab cov cuab yeej sib tsoo.

Corundum muaj lub iav luster thiab hardness ntawm 9. Qhov kev faib ua feem yog 3.95-4.10. Nws yog tsim nyob rau hauv tej yam kev mob ntawm kub siab, nplua nuj aluminium thiab tsis zoo silicon C, thiab feem ntau yog txuam nrog magmatism, hu rau metamorphism thiab lub regional metamorphism.

Corundum yog cov khoom tsim los ntawm cov txiv neej ua los ntawm bauxite ua cov khoom siv tseem ceeb hauv qhov cub mining. Nws tuaj yeem siv ua cov khoom siv abrasive thiab refractory. Dawb corundum nrog purity siab dua yog hu ua dawb corundum, thiab xim av corundum nrog me me ntawm impurities hu ua xim av corundum.