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Macor (Machinable Glass Ceramic) - Typical Properties

Chemical Formula

46% SiO2,16% Al2O3, 7% B2O3, 10% K2O, 17% MgO

Topics Covered

Background

Mechanical Properties

Thermal Properties

Electrical Properties

Chemical Properties

Background

Typical properties for Macor are given in the tables below.

Mechanical Properties

Property Value
Density 2.52 g/cm3
Porosity 0%
Young’s Modulus (@ 25 °C) 66.9 GPa
Poissons Ratio 0.29
Shear Modulus (@ 25 °C) 25.5 GPa
Hardness – Knoop (100 g) 250
Hardness – Rockwell A 48
Modulus of Rupture (@ 25 °C) 94 MPa
Compressive Strength 345 MPa
Fracture Toughness 1.53 MPa.m

 

Thermal Properties

Property Value
Co-Efficient of Thermal Expansion
     -200 – 25 °C
     25-300 °C
     25-600 °C
     25-800 °C

74x10-7/°C
93x10-7/°C
114x10-7/°C
126x10-7/°C
Specific Heat 0.79 kJ/kg.°C
Thermal Conductivity (@ 25 °C) 1.46 W/m.°C
Thermal Diffusivity (@ 25 °C) 7.3x10-7m2/s
Continuous Operating Temperature 800 °C
Maximum No Load Temperature 1000 °C

 

Electrical Properties

Property Value
Dielectric Constant (@ 25 °C)
     1 kHz
     8.5 GHz

6.03
5.67
Loss Tangent (@ 25 °C)
     1 kHz
     8.5 GHz

4.7x10-3
7.1x10-3
Dielectric Strength (AC average)
12 mm thickness and 25 °C
9.4 kV/mm
Dielectric Strength (DC average)
12 mm thickness and 25 °C
62.4 kV/mm
DC Volume Resistivity (@25 °C) >1016 ohm.cm

 

Chemical Properties

Solution PH Time Temp. Wt Loss
(mg/cm2)
5% Hydrochloric Acid (HCl) 0.1 24 hrs 95 °C ~100
0.002 M Nitric Acid (HNO3) 2.8 24 hrs 95 °C ~0.6
0.1 M Sodium Bicarbonate (NaHCO3) 8.4 24 hrs 95 °C ~0.3
0.02 M Sodium Carbonate (Na2CO3) 10.9 6 hrs 95 °C ~0.1
5% Sodium Hydroxide (NaOH) 13.2 6 hrs 95 °C ~10
Resistance to water over time 7.6 1 day*
3 days*
7 days*
3 days
6 days
95 °C
95 °C
95 °C
95 °C
95 °C
0.01
0.07
9.4
0.06
0.11

* water not refreshed daily
water refreshed daily

 

Primary author: AZoM.com

 

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