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Rulon Bearings

Morgan Advanced Ceramics Deranox™ 975 Mac-A975R Aluminum Oxide Ceramic
Categories: Ceramic; Oxide; Aluminum Oxide

Material Notes: Fine grain alumina ceramic of 97.5% Al2O3 content. A high quality material, widely used for electrical and mechanical components that require thick film metallizing, as well as for dynamic duties where resistance to abrasion and chemical attack are essential.

Prime Features:

  • Can be thick film metallized with noble metal
  • High volume resistivity
  • High mechanical strength
  • Excellent corrosion resistance
  • Excellent wear resistance
  • Low coefficient of friction
  • High thermal stability
  • High density, non-porous and vacuum tight
Typical Applications:
  • Thick film metallized components, such as those with conductor and/or resistor networks, dielectric layers, solderable interfaces
  • High-integrity devices for duties in the defence, aerospace, medical, laser and scientific instrument fields. Dynamic and static components in pumps and valves that handle corrosive or abrasive media.
Production Capabilities:
  • Complex pressed and machined components
  • Ground or polished surface finishes
  • Spheres to high tolerance
  • Precision thick film metallizing
  • Prototype, batch and volume production
  • Soldered assemblies

Information provided by Morgan Advanced Materials

Key Words: Mac-A975R
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Physical PropertiesMetricEnglishComments
Density 3.80 g/cc0.137 lb/in³fired
Open Porosity 0.00 %0.00 %fully dense, % nominal, apparent
Grain Size 4.0 µm4.0 µm
 
Mechanical PropertiesMetricEnglishComments
Hardness, Rockwell HR45N 8585
Hardness, Vickers 15
@Load 0.500 kg
15
@Load 1.10 lb
[GPa]
Modulus of Elasticity 340 GPa
@Temperature 20.0 °C
49300 ksi
@Temperature 68.0 °F
Young's
Flexural Strength 350 MPa50800 psi3-point; ASTM C1161
Compressive Strength 2500 MPa363000 psi
Fracture Toughness 3.60 MPa-m½3.28 ksi-in½
 
Electrical PropertiesMetricEnglishComments
Volume Resistivity  >= 1.00e+8 ohm-cm
@Temperature 600 °C
>= 1.00e+8 ohm-cm
@Temperature 1110 °F
 >= 1.00e+12 ohm-cm
@Temperature 300 °C
>= 1.00e+12 ohm-cm
@Temperature 572 °F
 >= 1.00e+16 ohm-cm
@Temperature 20.0 °C
>= 1.00e+16 ohm-cm
@Temperature 68.0 °F
Dielectric Constant  9.5
@Frequency 9.40e+9 Hz
9.5
@Frequency 9.40e+9 Hz
 9.6
@Frequency 1e+6 Hz
9.6
@Frequency 1e+6 Hz
Dielectric Strength 20.0 kV/mm
@Thickness 2.00 - 3.00 mm
508 kV/in
@Thickness 0.0787 - 0.118 in
Dissipation Factor  0.00019
@Frequency 1e+6 Hz
0.00019
@Frequency 1e+6 Hz
 0.00043
@Frequency 9.40e+9 Hz
0.00043
@Frequency 9.40e+9 Hz
 
Thermal PropertiesMetricEnglishComments
CTE, linear 8.10 µm/m-°C
@Temperature 0.000 - 800 °C
4.50 µin/in-°F
@Temperature 32.0 - 1470 °F
Specific Heat Capacity 0.880 J/g-°C0.210 BTU/lb-°F
Thermal Conductivity 24.0 W/m-K
@Temperature 20.0 °C
167 BTU-in/hr-ft²-°F
@Temperature 68.0 °F
Maximum Service Temperature, Air 1600 °C2910 °Fno load
 
Component Elements PropertiesMetricEnglishComments
Al2O3 <= 97.5 %<= 97.5 %
 
Descriptive Properties
Colorwhite
Thermal Downshock190 sC

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