Product Details

Refractory Alumina Ceramic Roller

Product Description

Alumina tube (99.7% Al2O3 material) can be used at operating temperature up to 1800℃ in both oxidizing and reducing atmospheres. Tubes have been evacuated to 10-7 Torr. It proves inert to carbon and refractory metals in many severe situations.

Main Performance Index

Performance Index	99.7 Alumina	95 Alumina	85Alumina
Al2O3 (%)	99.7	95	85
SiO2 (%)	<0.1	—	—
Density (g/cm3)	3.95	3.88	3.2
Water Absorption (%)	0	0.01	0.2
Cld Compressive Strength (MPa)	450	350	200
20C Leak Rates (Torr/L.sec)	<10-11	<10-11	<0-11
Twisting In High Temperature (mm)	1700C 0.2 allowance	1600C 0.2 allowance	1400C 0.2 allowance
Bonding In High Temperature	1700C non-caked	1600C non-caked	1400C non-caked
20—1000C Coefficient of Thermal Expansion (mm.10-6/C m)	8.6	8.2	8.2
Thermal Conductivity (W/m.k)	25	25	25
Electric Insulation Strength (KV/mm)	20	20	15
20C Direct Current Insulating Resistance (Ohm/cm)	1014	1014	1014
High-Temperature(1000C MΩ) Insulation Resistance (1300C MΩ_	≥0.08	≥0.08	≥0.08
High-Temperature(1000C MΩ) Insulation Resistance (1300C MΩ_	≥0.02	≥0.02	≥0.02
Thermal Shock Resistance	1550C 6 times not cracked	1550C 6 times not cracked	1300C 3 times not cracked
Max. Temperature (C)	1900	1800	1400

Standard Sizes

OD/ID: 6/3mm, 8/5, 10/7, 12/8, 14/10, 16/12, 20/14, 25/19, 30/25, 40/34, 50/44, 60/53, 70/63, 80/70, 85/75, 90/80, 100/90, 110/100, 120/110, 130/120, 140/130, 150/140, 160/150, 180/170mm

Length: 10~3000mm

Noted: Other special size could be customized according to your requirements

Typical Application

Alumina ceramic tube is mainly applied to wear, serious scour of material handling occasions, such as coal-fired power generation, metallurgy, coal, mining, industry, and other geological materials pipeline, as well as the use of electronic appliance such as insulation pipe; alumina ceramic rods is widely used in the industry of resistance to temperature and thermostat, as a resistance ceramic matrix and two-metal thermostat used in ceramic-top column.