Aluminom oxide

Nkọwa dị mkpirikpi:

Alumina bụ oxide kwụsiri ike nke aluminom, usoro kemịkalụ bụ Al2O3.A na-akpọkwa ya bauxite na Ngwuputa, ceramik na sayensị ihe.

Zitere anyị email

Nkọwa ngwaahịa

Mkpado ngwaahịa

Ngwongwo: ọcha siri ike insoluble na mmiri, odorless, keenweghiuto, nnọọ ike, mfe banye mmiri mmiri na-enweghị delixing (ọkụ ọkụ).Alumina bụ ihe na-ahụkarị amphoteric oxide (corundum bụ α-ekara na bụ nke ndị densiest hexagonal mbukota, bụ inert compound, ubé soluble na acid na alkali corrosion resistance [1]), soluble na inorganic acid na alkaline ngwọta, ọ fọrọ nke nta ka ọ ghara soluble na mmiri. na ndị na-abụghị polar organic solvents;Njupụta nke ikwu (d204) 4.0;Ebe mgbaze: 2050 ℃.

Nchekwa: Debe akara ma kpọọ nkụ.

Na-eji: Eji ya dị ka nyocha reagent, organic ihe mgbaze akpịrị ịkpọ nkụ, adsorbent, organic reaction catalyst, abrasive, polishing agent, akụrụngwa maka agbaze aluminum, refractory

Isi ihe

Alumina nwere aluminom na oxygen.Ọ bụrụ na bauxite akụrụngwa site kemịkalụ ọgwụgwọ, wepụ oxides nke silicon, ígwè, titanium na ndị ọzọ na ngwaahịa bụ nnọọ ọcha alumina akụrụngwa, Al2O3 ọdịnaya bụ n'ozuzu karịa 99%.Usoro nke ịnweta bụ 40% ~ 76% γ-Al2O3 na 24% ~ 60% α-Al2O3.γ-Al2O3 na-agbanwe ka ọ bụrụ α-Al2O3 na 950 ~ 1200℃, yana oke mbelata olu.

aluminum oxide (aluminium oxide) bụ ụdị inorganic, chemical ụdị Al2O3, bụ ụdị elu ike ike ogige, agbaze ebe nke 2054 ℃, esi ebe 2980 ℃, ionized crystal na elu okpomọkụ, na-ejikarị emeputa nke refractory ihe. .

A na-akwado alumina ụlọ ọrụ site na bauxite (Al2O3 · 3H2O) na diaspore.Maka Al2O3 nwere oke ịdị ọcha chọrọ, a na-akwado ya site na usoro kemịkalụ.Al2O3 nwere ọtụtụ heterocrystals homogenous, enwere ihe karịrị 10 mara, enwere ụdị kristal 3, ya bụ α-Al2O3, β-Al2O3, γ-Al2O3.N'ime ha, Ọdịdị na Njirimara dị iche iche, na α-Al2O3 fọrọ nke nta ka kpamkpam ghọọ α-al2o3 na elu okpomọkụ n'elu 1300 ℃.

Njirimara anụ ahụ

InChI = 1 / Al 2 o/rAlO ₂ / c2-1-3

Arọ molikula: 101.96

Ebe mgbaze: 2054 ℃

Ebe esi mmiri: 2980 ℃

Ezi njupụta: 3.97g/cm3

Njupụta na-adịghị mma: 0.85 g/ml (325 mesh ~ 0) 0.9 g/ml (120 mesh ~ 325 mesh)

Ọdịdị kristal: hex tripartite usoro

Solubility: enweghị ike soluble na mmiri na ụlọ okpomọkụ

Eletrik conductivity: Ọ dịghị conductivity eletrik na ụlọ okpomọkụ

Al₂O₃ bụ kristal ionic

Eji akụkụ alumina ---- corundum artificial

Enwere ike iji ike siri ike nke Corundum dị ka abrasive, ntụ ntụ na-egbuke egbuke, alumina dị elu nke na-ekpo ọkụ, nke a na-akpọ corundum artificial ma ọ bụ nkume nkume artificial, nwere ike mee ya site na nchara ígwè ma ọ bụ elekere na diamond.A na-ejikwa alumina mee ihe dị ka ihe na-eme ka okpomọkụ dị elu, na-eme brik refractory, crucible, poselin, bara nnukwu uru, alumina bụkwa ihe eji eme ihe nke aluminom.Calcined aluminum hydroxide nwere ike imepụta γ-.Gamma-al ₂O₃ (n'ihi mgbasa ozi siri ike ya na ọrụ catalytic) nwere ike iji mee ihe dị ka ihe na-eme ka ọ bụrụ ihe na-eme ka ọ bụrụ ihe na-eme ka ọ bụrụ ihe na-eme ka ọ bụrụ ihe na-eme ka ọ bụrụ ihe na-emepụta ihe.Akụkụ bụ isi nke corundum, alfa-al ₂O₃.kristal tripartite n'ụdị gbọmgbọm ma ọ bụ cone.Ọ nwere enyo enyo ma ọ bụ diamond luster.Njupụta bụ 3.9 ~ 4.1g / cm3, ike bụ 9, ebe agbaze bụ 2000 ± 15 ℃.Na-adịghị edozi na mmiri, na-adịghị edozi na acid na bases.Nnukwu okpomọkụ na-eguzogide.Colorless transparent kwuru na-acha ọcha jed, nwere akara nke trivalent chromium red mara dị ka rubi;Agba anụnụ anụnụ nwere abụọ -, atọ - ma ọ bụ anọ - valent iron ka a na-akpọ sapphire;Nwere obere ferric oxide ọchịchịrị isi awọ, agba ọchịchịrị akpọrọ corundum ntụ ntụ.Enwere ike iji ya dị ka bearings maka ngwa nkenke, diamond maka elekere, wiil egweri, polishes, refractories na insulators eletriki.A na-eji nkume dị oké ọnụ ahịa na-egbuke egbuke chọọ mma.sịntetik ruby otu kristal laser ihe onwunwe.Na mgbakwunye na mineral eke, enwere ike ime ya site na hydrogen na ikuku oxygen na-agbaze aluminum hydroxide.

Alumina seramiiki

A na-ekewa alumina n'ime alumina calcined na alumina ụlọ ọrụ nkịtị.Calcined alumina bụ ihe dị mkpa maka imepụta brik ochie, ebe a na-eji alumina ụlọ ọrụ eme ihe maka imepụta nkume microcrystalline.Na glazes ọdịnala, a na-ejikarị alumina eme ihe dị ka ọcha.Ojiji nke alumina na-abawanye kwa afọ dịka brik ochie na okwute microcrystalline na-amasị ahịa.

Ya mere, seramiiki alumina pụtara na ụlọ ọrụ seramiiki - alumina ceramics bụ ụdị ihe seramiiki nwere Al₂O₃ dị ka isi akụrụngwa na corundum dị ka usoro kristal bụ isi.N'ihi na nke elu n'ibu ike, elu ike ike, elu ugboro dielectric ọnwụ, elu okpomọkụ ikpuchi eguzogide, chemical corrosion eguzogide na ezi thermal conductivity na ndị ọzọ uru nke magburu onwe keukwu teknuzu arụmọrụ.