Aluminum Oxide ceramic parts - Al2O3

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Aluminum Oxide Ceramic - Al2O3

Aluminum Oxide Ceramic Products

Purity--- 95, 99%, 99.99% or International standards type

Shape--- Crucibles , parts on drawing

Dimension---Custom-Made

Our Advantage

China rare metal material co.,limited (CRM) is an experter in manufacture Aluminum Oxide ceramic parts. All Aluminum Oxide ceramic parts are manufacture by programs with with the highest possible density, high purity and smallest possible average grain size...

CRM material co.,limited is specialized in making various ceramic parts. We have many raw material compounds line, such as semiconductor line, chemical compounds line, metallurgy line, powder milling line, etc. Moreover, we introduced many advanced technology and equipments from related companies at home and aborad. We also have an experienced research team who have developed many new and special sputtering targets, and also successfully made many trial orders and received many customers satisfaction and long-term friendship.

All Aluminum Oxide ceramic parts are analyzed using best detection means including chemical analysis, Crystal phase microscope, x ray diffraction(XRD), X-Ray Fluorescence (XRF), Glow Discharge Mass Spectrometry (GDMS), and Inductively Coupled Plasma (ICP).

Aluminium Oxide Base Information

Amphoteric nature: Aluminium oxide is an amphoteric substance, meaning it can react with both acids and bases, such as hydrofluoric acid and sodium hydroxide, acting as an acid with a base and a base with an acid, neutralising the other and producing a salt.

Al2O3 + 6 HF → 2 AlF3 + 3 H2O
Al2O3 + 2 NaOH + 3 H2O → 2 NaAl(OH)4 (sodium aluminate)

Structure: Corundum from Brazil, size about 2×3 cm.
The most common form of crystalline aluminium oxide is known as corundum, which is the thermodynamically stable form.The oxygen ions nearly form a hexagonal close-packed structure with aluminium ions filling two-thirds of the octahedral interstices. Each Al3+ center is octahedral. In terms of its crystallography, corundum adopts a trigonal Bravais lattice with a space group of R-3c (number 167 in the International Tables). The primitive cell contains two formula units of aluminium oxide.

Aluminium oxide also exists in other phases, including the cubic γ and η phases, the monoclinic θ phase, the hexagonal χ phase, the orthorhombic κ phase and the δ phase that can be tetragonal or orthorhombic. Each has a unique crystal structure and properties. Cubic γ-Al2O3 has important technical applications. The so-called β-Al2O3 proved to be NaAl11O17.

Molten aluminium oxide near the melting temperature is roughly 2/3 tetrahedral (i.e. 2/3 of the Al are surrounded by 4 oxygen neighbors), and 1/3 5-coordinated, very little (<5%) octahedral Al-O is present. Around 80% of the oxygen atoms are shared among three or more Al-O polyhedra, and the majority of inter-polyhedral connections are corner-sharing, with the remaining 10–20% being edge-sharing. The breakdown of octahedra upon melting is accompanied by a relatively large volume increase (~20%), the density of the liquid close to its melting point is 2.93 g/cm3.

Use: electric ceramic, adsorbent, refractory material, catalyst, GC analysis component, filler,glass, catalysis, purification, abrasive, paint, composite fiber, abrasion protection.

CAS Number： 1344-28-1
ChemSpider： 8164808
ECHA InfoCard：100.014.265
PubChem： 9989226
RTECS number： BD120000
UNII： LMI26O6933

Chemical formula: Al2O3
Molar mass: 101.96 g·mol−1
Appearance: white solid
Odor: odorless
Density: 3.95–4.1 g/cm3
Melting point: 2,072 °C (3,762 °F; 2,345 K)
Boiling point: 2,977 °C (5,391 °F; 3,250 K)

Solubility in water : insoluble
Solubility: insoluble in diethyl ether practically insoluble in ethanol
Thermal conductivity: 30 W·m−1·K−1
Refractive index (nD): nω=1.768–1.772,nε=1.760–1.763, Birefringence 0.008
Crystal structure: Trigonal, hR30, space group = R3c, No. 167
Lattice constant: a = 478.5 pm, c = 1299.1 pm
Coordination geometry: octahedral

Std molar entropy (So298): 50.92 J·mol−1·K−1
Std enthalpy of formation (ΔfHo298): −1675.7 kJ·mol−1