Machinable Glass Ceramic
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Machinable Glass Ceramic properties
Machinable glass ceramics is a fluorophlogopite glass-ceramic with synthetic mica as the main crystal phase,the main component is fluorophlogopite (Mg3K[AlF2O(SiO3)3]). And the glass composition with silica as the main component . The material is similar to MACOR. The performance is basically the same.
Machinable Glass Ceramic have the following power feature:
a) Machinable with ordinary metal working tools.
b) Allows Fast Turnaround,no post firing required.
c) Holds Tight Tolerances, up to .0005"
d) Withstands High Temperature, up to 800℃
e) Clean, no outgasing and zero porosity
Physical Properties
Color
White
Density
2.48 g/cm3
Porosity
0.069%
Young’s Modulus
65 GPa @ 25C°
Rockwell Hardness A Scale
40
Modulus of Rupture
>108 MPa
Compressive Strength
>508 MPa
Impact toughness
>2.56KJ/ m2
Thermal Properties
Thermal Expansion
8.6 ppm @ 100 – 600C°
Thermal expansion coefficient
72×10-7/°C ( from -50°C to 200°C)
Thermal Conductivity
1.71 W-mk @ 25C°
Maximum No Load Temp.
1000C° Short Term
Maximum Long Term Temp.
800C° Continuous
Electrical Properties
Volume Resistivity
>1016 0hm-cm
Dielectric Strength
40 KV/mm– AC/DC @ 1mm
Loss Tangent
1-4 x 103 @ 1 KHz
7 x 103 @ 8.5 KHz
Dielectric constant
6-7
Volume resistance
1.08×1016Ω.cm
1.5×1012Ω.cm
1.1×109Ω.cm
Outgassing rate
room temperature
8.8×10-9 ml/s. cm2 Vacuum for 8 hours
Helium transmission rate
1×10-10ml/s (After burning at 500°C, cool to room temperature)
Gravimetric Weight Loss @ 95C°
Solution
Concentration
PH
Time
Weight Loss
Hydrochloric Acid
5 % HCl
0.1
24 hrs.
~0.26 mg/cm2
Hydrofluoric acid
5%HF
~83mg/ cm2
Sodium Carbonate
0.02 N Na2CO3
10.9
6 hrs.
~0.012 mg/cm2
Sodium Hydroxide
5% NaOH
13.2
6 hrs.
~0.85 mg/cm2
