Alumina & Ceramics



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 and Y stabilized, ZTA, and others.
  • Cordierite
  • Porcelain
  • Saphire
  • Fused Quartz
  • Ceramic Composite
Alumina and performance Ceramics from CeraMaterials
  • Non-oxide Ceramics & Carbides
  • Silicon Carbide, SiC, all types
  • Silicon Nitride (Si3N4)
  • Boron Nitride (BN, all types)
  • Boron Carbide (BN)
  • Tungsten Carbide (WC)
  • Aluminum Nitride (AIN)

Useful Chart

Sintered Ceramics Properties
PropertiesUnitsTestMulliteAlumina
94%
Alumina
96%
Alumina
99.5%
Alumina
99.8%
Zirconia
ZTA
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.
Densitygm/ccASTM-C202.803.703.723.903.924.01
Crystal Size AverageMicronsThin-section10126662
Water Absorption%ASTM-373000000
Gas Permeability--000000
Color--TanWhiteWhiteIvoryIvoryWhite
Flexural Strength
(MOR) 20℃
MPa (psi x 10³)ASTM-F417170 (25)352 (51)358 (52)379 (55)375 (54)450 (65)
Elastic Modulus 20℃GPa (psi x 10³)ASTM-C848150 (22)303 (44)303 (44)370 (54)370 (54)360 (52)
Poisson's Ratio ℃-ASTM-C848-0.210.210.220.220.23
Compressive Strength 20℃MPa (psi X 10³)ASTM-C773550 (80)2103 (305)2068 (300)2600 (377)2500 (363)2900 (421)
HardnessGPa (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 m1/2Notched Beam24-54-54-54-55-6
Thermal Conductivity 20℃W/m °KASTM-C4083.522.424.730.030.027.00
Coefficient of Thermal Expansion
25-100℃
1 x 10-6/℃ASTM-C3725.38.28.28.28.28.3
Specific Heat 100℃J/kg*KASTM-E1269950880880880880885
Thermal Shock Resistance
Δ Tc
Note 3300250250200200300
Max Use TemperatureNo-Load Cond.170017001700175017501500
Dielectric Strengthac-kV/mm
acV/mil
ASTM-D1169.8
248
8.3
210
8.3
210
8.7
220
8.7
220
9.0
228
Dielectric Constant 1 MHz25℃ASTM-D1506.09.199.79.810.6
Dielectric Loss
(tan delta) 1 MHz
25℃ASTM-D1500.00200.00040.00020.00010.0010.0005
Volume Resistivity
25℃
500℃
1000℃
ohm-cmASTM-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 4-0.520.500.470.470.41
Rubbing-Note 4--0.60--0.49

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