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Materials

 

Accuflect®

Aluminum Nitride

Aluminum Oxide

Boron Nitride

Fused Silica

MACOR®

Mullite

Sialon

Silicon Carbide

Silicon Nitride

Zirconium Oxide

 

 

MACOR® Machinable Glass Ceramic Properties


(See the MACOR® section in Standard Products for more detailed information)

MACOR® is cast as a two phase glass. After casting, it is heat treated causing crystallization of one phase giving rise to its glass-like and ceramic-like characteristics.

.Key Properties of MACOR® Machinable Glass Ceramic

check Low thermal conductivity
check Low dielectric constant
check High electrical resistance
check Excellent resistance to high voltage puncture
check Easily machined
check Hermetic with no post-machining firing required

Typical Uses of MACOR® Machinable Glass Ceramic

check Electrical spacers in vacuum systems
check Thermal insulators in heated or cooled assemblies
check High intensity lamp reflectors
check Crystal supports
check Laser cavity components
check Microcircuit and photonics packaging

General MACOR® Machinable Glass Ceramic Information

MACOR® exhibits good thermal shock resistance and mechanical toughness when compared to conventional glasses with similar thermal and mechanical properties.

MACOR® is usable in an air atmosphere to 1000° C. In vacuum systems, where the temperature exceeds 600° C, fluorine evolution will occur manifesting itself as boron trifluoride or hydrofluoric acid.
MACOR® is attacked by halogen acids at elevated temperatures. It is significantly more resistant to NaOH. Alkali salts have a negligible corrosion effect.

MACOR® is easily machined using standard metal working tools. It is fully dense and hermetic requiring no firing after machining to develop it’s physical properties. Tolerances of less than 10 microns (.0005") are easily maintained.

Download MACOR® datasheet

Engineering Properties* of MACOR® Machinable Glass Ceramic

MACOR®
Mechanical

Units of Measure

SI/Metric

(Imperial)

Density

gm/cc (lb/ft3)

2.52

(157)

Porosity

% (%)

0

(0)

Color

white

Flexural Strength

MPa (lb/in2x103)

94

(13.6)

Elastic Modulus

GPa (lb/in2x106)

66.9

(9.7)

Shear Modulus

GPa (lb/in2x106)

25.5

(3.7)

Bulk Modulus

GPa (lb/in2x106)

Poisson’s Ratio

0.29

(0.29)

Compressive Strength

MPa (lb/in2x103)

345

(50)

Hardness

Kg/mm2

250

Fracture Toughness KIC

MPa•m1/2

1.53

Maximum Use Temperature
(no load)

°C (°F)

1000

(1832)

Thermal

Thermal Conductivity

W/m•°K (BTU•in/ft2•hr•°F)

1.5

(10.2)

Coefficient of Thermal Expansion

10–6/°C (10–6/°F)

9.0

(5.0)

Specific Heat

J/Kg•°K (Btu/lb•°F)

790

(0.19)

Electrical

Dielectric Strength

ac-kv/mm (volts/mil)

45

(1150)

Dielectric Constant

@ 1 kHz

6.0

(6.0)

Dissipation Factor

Loss Tangent

@ 1 kHz

.005

(.005)

Volume Resistivity

ohm•cm

1017

(1017)

*All properties are room temperature values except as noted.
The data presented is typical of commercially available material and is offered for comparative purposes only. The information is not to be interpreted as absolute material properties nor does it constitute a representation or warranty for which we assume legal liability. User shall determine suitability of the material for the intended use and assumes all risk and liability whatsoever in connection therewith.

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