Alumina Ceramic Products
Omegaslate offers two grades of fully sintered high alumina ceramics; grade 9985 (a 95% alumina) and grade 8998 (a 97.5% alumina). Both alumina grades are classified as above average wear resistant ceramics, and the 97.5% grade, in general terms, can exhibit three times more wear resistance than the 95% alumina ceramic grade. The 97.5% alumina ceramic is normally used in pneumatic conveying applications, where materials containing silicas are being transported at very high velocities; the 95% alumina is suitable for most other highly aggressive mechanical and chemical wear applications.
Both alumina ceramic grades can be moulded or fabricated into a wide variety of simple and complex, flat and curved large area shapes, such as cones, venturies, chokes, nozzles, guides, rollers, valves and many other shapes traditionally cast in hard metals.
In very general terms, thickness for thickness, Omegaslate 95% alumina ceramic can outlast EN8 by up to 60 times in low velocity wet applications, and will exhibit better non-stick or slide promoting properties, when polished, than stainless steel.
We have supplied and installed alumina ceramic lining systems to operate in temperatures of up to 1250 degrees centigrade.
Omegaslate alumina ceramic lining systems have been used to protect a wide range of materials handling machinery and equipment operated by the power generating, steelmaking, coal mining, sand and gravel quarrying, sugar refining, paper making and petro-chemical industries. Click here for a list.
Click here to view some of our alumina ceramic lining systems
Alumina Ceramic General Technical Specification
| Properties (Grade Reference) |
Alumina Ceramic (Grade 9985) 95% Alumina |
Alumina Ceramic (Grade 8998) 97.5% Alumina |
|
|---|---|---|---|
|
Density Hardness HV (KHN) Flexural Strength (3 point) Tensile Strength (ACMA Test #4) Compressive Strength (ASTMC-773-74) Fracture Toughness KIC (Indentation) Youngs Modulus x 10-6 (Ultrasonic) Shear Modulus x 10-6 Poisson's Ratio (ASTMC-623) Coefficient of Linear Thermal Expansion x 10-6 / degrees C (ASTMC-372) Thermal Conductivity W/m/degrees K Dielectric Strength (ASTMD-1496.35mm) Dielectric Constance @ 25 degrees C (ASTMD-116) Dissipation Factor @ 25 degrees C (ASTMD-116) Thermal Shock (Hasselman) Porosity Water Absorption |
grms/cm3 kg/mm2 kpsi Mpa kpsi kpsi MPa MPa m psi psi 25-200 25-500 25-800 25-1000 25-1000 400 800 1000 V/mil 1KHz 1MHz 1GHz 1KHz 1MHz 1KHz degrees C - - |
3.7 1160 (1096) 49.5 341 28.6 196 325 2241 3.7 45 18 0.25 6.0 7.2 7.9 8.3 28.5 10.1 6.3 5.4 183 9.3 9.2 9.1 0.0007 0.0003 0.0006 200 Gas Tight Nil |
3.85 1590 (1598) 56 386 25 72 260 1800 4.3 48 19 0.26 5.6 7.0 7.9 8.3 35.4 12.1 7.5 6.4 190 9.6 9.5 9.4 0.0008 0.0008 0.0009 200 Gas Tight Nil |
| Material | Description | Cost (£)/ Litre |
Wear Index |
Relative Life |
Cost (£)/ Unit Wear |
|---|---|---|---|---|---|
|
Coromant High Alumina Ceramic ZAC 1681 Mecla 1687 Duaplate BF 253 BF954 Compass 855 Red Diamond ZAC AG BF202 CP 30 B CX AR 360 5 Cast Basalt Domitz Lefco Tile Delcrom C Siebara CP 30 A Hotspur 500 Meehanite H52 Creusabro 32 CT/H Rymet Creusabro 400 Sinzig Tile Arcol 360 Loycon QT Decol 445 Nori Brick Wooliscroft Tile ARQ 340 ARQ 280 Alag BS11 EN8 BS 4360 50B EN58 BS 4360 Plate Glass Sega Duromit Lintafoam Trelleborg Betonac Arco Tercol |
Sintered Tungsten Carbide Fully Sintered Alumina Fusion Cast Alumina Steel Armour Plate Cr Plated Hard Facing Hi Cr White Cast Iron Ni Cr White Cast Iron Steel Armour Plate Work Hardened Steel Sintered Crushed ZAC Cr Mo White Iron QT Steel QT Steel Volcanic Rock Cr Mo White Iron Acid Resistant Floor Tile Cast Cr Fe Alloy QT Steel QT Steel QT Steel SG Iron Normalised Steel Low Alloy Cast Iron Low Alloy Cast Steel Normalised Steel Acid Resistant Floor Tile QT Steel QT Steel QT Steel Carbonif Shale Brick Acid Resistant Floor Tile QT Steel QT Steel Aluminous Cement Rail Steel Steel Steel 312 Stainless Steel Rolled Mild Steel Solid Rubber Composite Concrete Polyurethane Sheet Solid Rubber Concrete Solid Rubber Resin Bauxite Trowelable |
742.00 4.00 6.00 10.96 24.00 5.19 4.8 2.94 5.32 2.30 7.36 10.18 3.56 0.95 28.25 0.44 83.00 10.10 10.18 8.22 6.65 3.32 5.54 4.95 4.25 1.16 3.62 3.80 3.23 0.07 0.35 3.32 3.15 0.33 2.19 1.44 1.57 9.63 1.41 |
0.0275 0.0800 0.1150 0.1340 0.2065 0.2310 0.4800 0.2860 0.3070 0.3210 0.3310 0.3350 0.3590 0.3780 0.3950 0.4130 0.4207 0.4600 0.4620 0.4620 0.4700 0.5290 0.5250 0.5710 0.5600 0.6850 0.6600 0.6650 0.7440 0.7600 0.7880 0.8150 0.8840 0.9100 0.9900 1.0000 1.077 1.095 1.493 1.760 1.850 1.900 2.160 2.360 2.410 4.800 5.000 |
36.36 15.00 8.69 7.46 4.48 4.33 4.16 3.49 3.32 3.11 3.02 2.98 2.76 2.64 2.53 2.42 2.34 2.17 2.16 2.16 2.12 1.90 1.87 1.75 1.53 1.52 1.51 1.50 1.43 1.31 1.28 1.22 1.13 1.09 1.01 1.00 |
20.407 0.235 0.690 1.460 5.357 1.199 1.154 0.842 1.602 0.740 2.437 3.416 1.290 0.360 11.166 0.182 35.470 4.654 4.713 3.805 3.137 1.747 2.962 2.828 2.778 0.763 2.397 2.533 2.259 0.053 0.273 2.721 2.788 0.303 2.168 1.440 1.691 10.544 2.110 |
Notes to the above:
- Cost figures for materials having a Wear Index of below 1.5 are not given, since they are unlikely to be of practical use in comparison with EN8.
- The lining materials below were field tested for sliding wear performance in coke chutes.
- The results quoted are only intended to give a broad indication of lining material cost and performance.
- The costs quoted are basic lining material purchase costs, and do not include the costs of installation or fitting.
Resilide (tm) Fine Grain Engineering Grade Reaction Bonded Silicon Carbide (Grade RBSiC/08/C)
Resilide reaction bonded silicon carbide is a high strength, fully dense, fine grain engineering ceramic, with excellent stiffness, higher than steel compressive strength, hardness and lubricity, that can be ground and lapped to very close tolerances enabling its use as fluid seal faces for handling very abrasive liquids and slurries.
The high thermal conductivity of Resilide helps with heat removal from thermal sensitive fluids and gasses and reduces cavitation at the seal face. Damage due to heat checking, often found in tungsten carbide, is avoided when using Resilide.
Resilide can be used to resist abrasion and corrosion in gas burning applications, as liners for fluidised bed feed pipework, heat transmission pipework, cyclones and hydrocyclones, spray nozzles, bearing and many other applications where extreme abrasion and corrosion in a problem in process and production plant and equipment.
It is more durable, more chemically resistant and less susceptible to mechanical damage than more coarse grained silicon carbides and it's surface is readily wetted enabling the production of a coherent hydrodynamic surface film which acts as a lubrication when handling fluids.
Resilide exhibits high strength retention in temperatures up to 1350 degrees centigrade, whilst most ceramics and metals lose their strength as temperature increases, and is harder than tungsten carbide and alumina. Thermal conductivity is as good as some aluminium alloys.
Resilide is resistant to aqueous solutions, all solvents and acids, except hydrofluoric and strong oxidising acids. It can be used in strongly alkaline abrasive slurries and is used with 10% sodium hydroxide up to 40 degrees Centigrade
|
Material Specification Density: Open Porosity: Poisson's Ratio: Thermal Conductivity: Maximum Operating Temperature: Wear Resistance: Thermal Shock Resistance: Thermal Expansion Coefficient: Fracture Toughness: Hardness: Grain Size: Compressive Strength: Tensile Modulus: Flexural Strength: Material Classification: |
RBSC/10/C 3.1 0% 0.24 200 W/mK 1350 degrees C continuous 3 to 5 times 95% alumina ceramic 59120 W/m (99.5% alumina = 5718 W/m) 4.4 (10-6 degrees C) 4MPam0.5 x 20 degrees C (Similar to 95% alumina) 3000 Vickers (95% alumina = 1000 Vickers) Less than 10 microns 2000 Mpa 390 GPa 400 Mpa Engineering Grade |
|---|
Click here to view some silicon carbide components
Omega HT40 High Temperature Wear Resistant Refractory Castable
Omega HT40:
- is a specially made synthetic aggregate, containing approximately 40% alumina. It is exceptionally hard, tough, dense and heat resistant;
- has a high compression strength of up to 100 N/mm2, and a hardness of up to 7.5 Mohs;
- has excellent impact, chemical corrosion, radiant heat and molten metal resistance properties;
- withstands constant temperatures of up to 1200 degrees C;
- has a high resistance to thermal shock;
- is a black, odourless angular aggregate;
- has a relative density of approximately 3.25;
- has a bulk density of 2,720kg/M3;
- is insoluble.
| Compound | Proportion | Name |
|---|---|---|
| Al2O3 | 38 - 40% | Monocalcium Aluminate |
| CaO | 3 - 5% | 12 CaO.7 Al2O3 |
| Fe2O3/FeO | 37 - 39% | Dicalcium Silicate |
| SiO2 | 15 - 18% | Calcium Alumino ferrites-Vitreous and fibrous phase |
Applications
Pipe bends
HT40 is used as a low and high temperature wear resistant lining system for pipe bends and straights handling pulverised fuel, fly ash, grits, slurries, cement and sand. The HT40 lining system can be supplied as pre-cast tubes or bend lining sections which are grouted into a mild or stainless steel bend casing, or it can be cast directly onto a weld mesh support frame.
Wear life: Depending on the hardness, lump or grit size, throughput and velocity of the material being handled, HT40 will improve operational life by up to 6 times that of the unlined item.
Cyclone Separators
Rotary dryer cyclones and cement cyclones are lined with HT40 to combat erosion and corrosion. HT40 can be cast directly onto a weld mesh support frame welded to the internal walls of the cyclone, or alternatively, annular components can be pre-cast and grouted into the cyclone fabrication.
Wear life: Depending on the hardness, lump or grit size, throughput and velocity of the material being handled, HT40 can improve operational life by up to 6 times that of the unlined item.
Other items
There are many other items of plant and equipment that can be protected from erosion, corrosion and high temperatures by installing an HT40 wear resistant refractory lining system. The success of any refractory lining system depends on its ability to accept the mechanical and chemical process conditions that exist. HT40 lining systems can be designed to accept differential expansion and high thermal shock loading, whilst also maintaining a high degree of erosion and corrosion resistance.
If you have an application which may benefit from an HT40 lining system, please contact Omegaslate.