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Alumina Ceramic:
The γ-type alumina is obtained by dehydrating aluminum hydroxide at a low temperature of 140-150 ° C, and is also called activated alumina or aluminum rubber in the industry. In the structure, oxygen ions are closely packed in the vertical direction, and Al3+ is irregularly distributed in the octahedral and tetrahedral voids surrounded by oxygen ions. Γ-type alumina is insoluble in water, soluble in strong acid or strong alkali solution, and it is converted to α-alumina by heating it to 1200 °C. Γ-type alumina is a porous material with an internal surface area of several hundred square meters per gram and high activity and high adsorption capacity. Industrial products are often colorless or micro-striped cylindrical particles with good pressure resistance. It is a commonly used adsorbent, catalyst and catalyst carrier in petroleum refining and petrochemical industry; it is industrial deacidizer for turbine oil and turbine oil, and is also used for chromatographic analysis; it is a neutral strong desiccant in the laboratory. The drying ability is no less than that of phosphorus pentoxide. After use, it can be regenerated and reused by heating at 175 ° C for 6-8 hours.
The world's alumina produced by the Bayer process accounts for more than 90% of the total production. Most of the alumina is used to make metal aluminum, which is less than 10% for other uses.
properties: High hardness, high strength, wear resistance, corrosion resistance, high temperacture (1600°), good thermal diffusivity, good insulativity, low cost etc.
Data Sheet↓
Color: White/Ivory Density: 3.9g/cm3 Alumina Content: 96% 99% 99.5% Gas permeability: 0 Water Absorption: 0 MONS' Hardness: 82 Vickers Hardness (Hv50): 15.7(1600) Gpa(Kg/mm²) Flexural Strength(20°C): 330Mpa Compressive Strength(20°C): 2000Mpa Fracture Toughness (20°C): 4 MPam1/2 Thermal Conductivity(20°C): 27.5W(m.K) Thermal Expansion Coefficient: 7.6 10-6/°C Thermal Shock Resistance: 200 △T°C
Maximum use temperature 1650°C
Dielectric Strength: >10 KV/mm
Dielectric Constant: 9.1er
Dielectric Loss Angle(1MHz): 0.0002-0.0003
Volume Resistivity(20°C): >1014Ω.cm
Application industry: Machinery, electronic, chemical, petroleum etc. Specific application: Electrical ceramic substrate, plunger, sealing ring etc.
Why Choose Us? 1.12 years of professional production industrial ceramics factory 2.High quality products with low price 3.High precision parts with lowest tolerance 4.Short time for production 5.Has a group of experienced, professional and efficient R&D team 6.Has a good reputation in China and abroad. 7.MOQ is not limited, small quantity is welcome.
8.Vigorous team and good after-sales service
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