All of our performance ceramics are available in tubes, rods, discs, and other custom fabrications while providing the highest quality, best service, and lowest price. Please contact us directly or send prints for a custom quote. Additionally, some stocked items are available in our store for immediate shipment. If you need help with your application our PhD Ceramic Engineer is available for scheduled consultations.
Oxide Ceramics
Alumina 85-99.9% purity
Mullite
Zirconia, MgO, Yttria SZ, ZTA, and others.
Cordierite
Porcelain
Sapphire
Fused Quartz
Ceramic Composite
Non-oxide Ceramics & Carbides
Silicon Carbide, SiC, all types
Silicon Nitride (Si3N4)
Boron Nitride (BN, all types)
Boron Carbide (BC)
Tungsten Carbide (WC)
Aluminum Nitride (AIN)
Useful Chart
Sintered Ceramics Properties
Properties
Units
Test
Mullite
Alumina
94%
Alumina
96%
Alumina
99.5%
Alumina
99.8%
Zirconia
ZTA
Density
gm/cc
ASTM-C20
2.80
3.70
3.72
3.90
3.92
4.01
Crystal Size Average
Microns
Thin-section
10
12
6
6
6
2
Water Absorption
%
ASTM-373
0
0
0
0
0
0
Gas Permeability
-
-
0
0
0
0
0
0
Color
-
-
Tan
White
White
Ivory
Ivory
White
Flexural Strength
(MOR) 20℃
MPa (psi x 10³)
ASTM-F417
170 (25)
352 (51)
358 (52)
379 (55)
375 (54)
450 (65)
Elastic Modulus 20℃
GPa (psi x 10³)
ASTM-C848
150 (22)
303 (44)
303 (44)
370 (54)
370 (54)
360 (52)
Poisson's Ratio ℃
-
ASTM-C848
-
0.21
0.21
0.22
0.22
0.23
Compressive Strength 20℃
MPa (psi X 10³)
ASTM-C773
550 (80)
2103 (305)
2068 (300)
2600 (377)
2500 (363)
2900 (421)
Hardness
GPa (kg/mm²)
R45N
Knoop 1000gm
Rockwell 45 N
7.4 (750)
70
11.5 (1175)
78
11.5 (1175)
78
14.1 (1440)
83
14.1 (1440)
83
14.4 (1475)
85
Tensile Strength 25℃
MPa (psi x 10³)
ACMA Test #4
-
193 (28)
221 (32)
262 (38)
248 (36)
290 (42)
Fracture Toughness
K(l c)
MPa m1/2
Notched Beam
2
4-5
4-5
4-5
4-5
5-6
Thermal Conductivity 20℃
W/m °K
ASTM-C408
3.5
22.4
24.7
30.0
30.0
27.00
Coefficient of Thermal Expansion
25-100℃
1 x 10-6/℃
ASTM-C372
5.3
8.2
8.2
8.2
8.2
8.3
Specific Heat 100℃
J/kg*K
ASTM-E1269
950
880
880
880
880
885
Thermal Shock Resistance
Δ Tc
℃
Note 3
300
250
250
200
200
300
Max Use Temperature
℃
No-Load Cond.
1700
1700
1700
1750
1750
1500
Dielectric Strength
ac-kV/mm
acV/mil
ASTM-D116
9.8
248
8.3
210
8.3
210
8.7
220
8.7
220
9.0
228
Dielectric Constant 1 MHz
25℃
ASTM-D150
6.0
9.1
9
9.7
9.8
10.6
Dielectric Loss
(tan delta) 1 MHz
25℃
ASTM-D150
0.0020
0.0004
0.0002
0.0001
0.001
0.0005
Volume Resistivity
25℃
500℃
1000℃
ohm-cm
ASTM-D1829
> 1014 5 x 1012
3 x 105
> 1014
4 x 109
5 x 105
> 1014
4 x 109
1 x 106
> 1014
2 x 1010
2 x 106
> 1014
2 x 1010
2 x 107
> 1014
2 x 109
3 x 106
Impingement
-
Note 4
-
0.52
0.50
0.47
0.47
0.41
Rubbing
-
Note 4
-
-
0.60
-
-
0.49
1. Data Measurements – All data measurements are typical and made at room temperature unless otherwise noted.
2. Composition Control – all ceramic compositions are controlled using modern chemical, spectrographic, and X-ray fluorescent methods.
3. Thermal Shock Resistance – Tests are run by quenching samples into water from various elevated temperatures. The change in temperature where a sharp decrease in flexural strength is observed is listed as DTc.
4. Wear Resistance – Impingement tests are run using a dry fused alumina abrasive. Rubbing tests are run using a dry 240 grit fused alumina abrasive. The indices in the chart are calculated by dividing the material volume loss by the volume loss of an AD-85 alumina control. The lower in the index, the better the wear resistance.
5. Dielectric Strength numbers represent measurements on samples that were 0.25” thick.
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