I-aluminium oxide

Izakhiwo: okuqinile okumhlophe okungancibiliki emanzini, akunaphunga, akunambitheki, kuqinile kakhulu, kulula ukumunca umswakama ngaphandle kokuncibilika (umswakama oshile).I-Alumina iyi-amphoteric oxide ejwayelekile (i-corundum imise okwe-α futhi ingeyepaki eliminyene kakhulu eliyi-hexagonal, iyinhlanganisela engasebenzi, encibilika kancane ku-asidi ne-alkali ukumelana nokugqwala [1]), encibilika ku-asidi ye-inorganic kanye nezisombululo ze-alkali, cishe ezingancibiliki emanzini. kanye nezincibilikisi ezingezona ze-polar eziphilayo;Ukuminyana okuhlobene (d204) 4.0;Indawo encibilikayo: 2050 ℃.

Isitoreji: Gcina ivaliwe futhi yomile.

Isetshenziswa: Isetshenziswa njenge-reagent analytical, i-organic solvent dehydration, i-adsorbent, i-organic reaction catalyst, i-abrasive, i-ejenti yokupholisha, izinto zokusetshenziswa zokuncibilikisa i-aluminium, i-refractory

Izithako eziyinhloko

I-Alumina iqukethe izakhi ze-aluminium nomoya-mpilo.Uma izinto zokusetshenziswa ze-bauxite ngokusebenzisa ukwelashwa kwamakhemikhali, susa ama-oxide we-silicon, insimbi, i-titanium neminye imikhiqizo iyimpahla ehlanzekile ye-alumina eluhlaza, okuqukethwe kwe-Al2O3 ngokuvamile kungaphezu kuka-99%.Isigaba samaminerali sakhiwe ngo-40% ~ 76% γ-Al2O3 kanye no-24% ~ 60% α-Al2O3.I-γ-Al2O3 iguqulela ku-α-Al2O3 ku-950 ~ 1200℃, ngokuncipha kwevolumu okubalulekile.

i-aluminium oxide (i-aluminium oxide) iwuhlobo lwe-inorganic, uhlobo lwamakhemikhali i-Al2O3, iwuhlobo lwenhlanganisela yobulukhuni obuphezulu, indawo encibilikayo engu-2054 ℃, indawo yokubilisa engu-2980 ℃, ikristalu eyi-ionized ekushiseni okuphezulu, evame ukusetshenziswa ekwenzeni izinto eziphikisayo. .

I-Alumina yezimboni ilungiswa nge-bauxite (Al2O3 · 3H2O) kanye ne-diaspore.Ku-Al2O3 enesidingo sokuhlanzeka okuphezulu, ngokuvamile ilungiswa ngendlela yamakhemikhali.I-Al2O3 inama-heterocrystals amaningi angama-homogenous, kunezinhlobo ezingaphezu kwe-10 ezaziwayo, kunezinhlobo ikakhulukazi ze-crystal ezingu-3, ​​okuyi-α-Al2O3, β-Al2O3, γ-Al2O3.Phakathi kwazo, isakhiwo nezakhiwo zihlukile, futhi i-α-Al2O3 icishe iguqulwe ngokuphelele ibe yi-α-al2o3 ekushiseni okuphezulu ngaphezu kwe-1300 ℃.

Izici ezingokomzimba

I-InChI = 1 / Al 2 o/rAlO ₂ / c2-1-3

Isisindo se-molecule: 101.96

Indawo encibilikayo: 2054 ℃

Indawo yokubilisa: 2980 ℃

Ukuminyana kwangempela: 3.97g/cm3

Ukuminyana kokupakisha okuxekethile: 0.85 g/mL (325 mesh ~0) 0.9 g/mL (120 mesh ~325 mesh)

Isakhiwo se-Crystal: uhlelo lwe-hex tripartite

I-Solubility: ayincibiliki emanzini ekamelweni lokushisa

I-electrical conductivity: Akukho conductivity kagesi ezingeni lokushisa legumbi

I-Al₂O₃ iyikristalu ye-ionic

Ukusetshenziswa kwengxenye ye-Alumina ---- i-corundum yokwenziwa

Ukuqina kwe-Corundum powder kungasetshenziswa njenge-abrasive, i-polish powder, izinga lokushisa eliphezulu le-alumina e-sintered, ebizwa ngokuthi i-corundum yokufakelwa noma itshe eliyigugu lokwenziwa, lingenziwa ngamabheringi omshini noma amawashi edayimane.I-Alumina iphinde isetshenziswe njengezinto zokushisa eziphakeme zokushisa, ukwenza izitini eziphikisayo, i-crucible, i-porcelain, amagugu okwenziwa, i-alumina nayo iyimpahla eluhlaza yokuncibilikisa i-aluminium.I-aluminium hydroxide ene-calcined ingakhiqiza i-γ-.I-Gamma-al ₂O₃ (ngenxa yokukhangisa okuqinile kanye nomsebenzi we-catalytic) ingasetshenziswa njenge-adsorbent kanye ne-catalyst.Ingxenye eyinhloko ye-corundum, i-alpha-al ₂O₃.Ikristalu elingunxantathu elisesimweni somgqomo noma ikhoni.Inokukhanya kwengilazi noma ukucwebezela kwedayimane.Ukuminyana kungu-3.9 ~ 4.1g/cm3, ubulukhuni buyi-9, indawo yokuncibilika ingu-2000±15℃.Ayincibiliki emanzini, futhi ayincibiliki kuma-asidi nezisekelo.Ukumelana nokushisa okuphezulu.I-jade emhlophe engenambala ethi, equkethe umkhondo we-chromium ebomvu eyaziwa ngokuthi irubi;Umbala oluhlaza okwesibhakabhaka oqukethe ezimbili -, ezintathu - noma ezine - i-valent iron ibizwa ngokuthi isafire;Iqukethe inani elincane le-ferric oxide elimpunga emnyama, umbala omnyama obizwa nge-corundum powder.Ingasetshenziswa njengamabheringi wezinsimbi ezinembayo, amadayimane amawashi, amasondo okugaya, ama-polishes, ama-refractories kanye nezivikeli zikagesi.Amatshe ayigugu anombala ogqamile asetshenziselwa ukuhlobisa.Synthetic ruby ​​single crystal laser material.Ngaphezu kwamaminerali emvelo, ingenziwa nge-hydrogen ne-oxygen flame encibilikisa i-aluminium hydroxide.

I-alumina ceramic

I-Alumina ihlukaniswe yaba i-alumina e-calcined kanye ne-alumina evamile yezimboni.I-aluminium Calcined iyinto ebalulekile yokukhiqiza izitini zakudala, kuyilapho i-alumina yezimboni ingasetshenziselwa ukukhiqizwa kwetshe le-microcrystalline.Emakhazeni endabuko, i-alumina ivame ukusetshenziswa njengokumhlophe.Ukusetshenziswa kwe-alumina nakho kuyanda unyaka nonyaka njengoba izitini zakudala namatshe e-microcrystalline ethandwa yimakethe.

Ngakho-ke, izitsha zobumba ze-alumina zavela embonini ye-ceramic -- i-alumina ceramics bekuwuhlobo lwempahla yobumba ene-Al₂O₃ njengento eluhlaza eyinhloko kanye ne-corundum njengesigaba sekristalu esiyinhloko.Ngenxa yamandla ayo aphezulu emishini, ubulukhuni obuphezulu, ukulahleka kwe-dielectric imvamisa ephezulu, ukumelana nokushisa okuphezulu kokushisa, ukumelana nokugqwala kwamakhemikhali kanye nokuhamba kahle kwe-thermal kanye nezinye izinzuzo zokusebenza okuhle kakhulu kobuchwepheshe.