General Product Information



Alumina Ceramic Products

95% alumina ceramic hydrocyclone components

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

Cost Performance of Various Wear Resistant Lining Materials

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:


Resilide (tm) Fine Grain Engineering Grade Reaction Bonded Silicon Carbide (Grade RBSiC/08/C)

Reaction bonded silicon carbide valve ball

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

Omega HT40 High Temperature Wear Resistant Refractory Castable

Omega HT40:

Composition
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.


Omegaslate (UK) Limited, 2 Chirk Close,
Forest Gate, Kidderminster, Worcs. DY10 1YG. United Kingdom.
Tel: +44 (0) 1562 755 824 Fax: +44 (0) 1562 742 979
Email: info@omegaslate.com