Macor - Mechanical, Thermal, Chemical and Electrical Properties of Macor Machinable Glass Ceramics by Precision Ceramics

Precision Ceramics, a division of McGeoch Technology, is a company dedicated to the engineering of technical ceramics. From procurement and supply through to technical design and specialist machining, we offer a complete service.

Our reputation for quality and service is truly international with specialist ceramic components engineered by Precision Ceramics finding their way into an ever-widening array of worldwide applications in industries as diverse as aerospace, opto-electronics and nuclear power.

Macor Machinable Glass Ceramic

Macor is an outstanding engineering material and is machinable with ordinary metalworking tools. Macor is also a problem solving material combining the performance of a technical ceramic with the versatility of a high performance plastic.

Macor has a high use temperature (800°C continuous to 1,000°C peak). It has a low thermal conductivity and is a useful high temperature insulator as well as an excellent electrical insulator. Macor has no porosity and when properly baked out, will not outgas. It is strong and rigid and, unlike high temperature plastics, will not creep or deform. Macor is also radiation resistant.

Macor is pure white and can be highly polished. It can be thick or thin film metallised, brazed and epoxy bonded. Another major advantage of this unique material is that, even in small quantities, components are economical to manufacture.

Mechanical Properties of Macor Machinable Glass Ceramic

The mechanical properties of Macor machinable glass ceramic is outline in the following table.

Table 1. Mechanical properties of Macor machinable glass ceramic

Properties

Metric

Imperial

Density

2.52 g/cm3

157 lbs/ft3

Porosity

0%

0%

Young’s Modulus, 25°C
(Modulus of Elasticity)

66.9 GPa

9.7x106psi

Poisson’s Ratio

0.29

0.29

Shear Modulus, 25°C

25.5GPa

3.7x106psi

Hardness, Knopp, 100g

250

250

Hardness, Rockwell A

48

48

Modulus of Rupture, 25°C
(Flexural Strength)

94 MPa

13,600psi

Compressive strength

345 MPa

50,000 psi

Fracture Toughness

1.53 MPa m0.5

1,390 psi in0.5

Thermal Properties of Macor Machinable Glass Ceramic

The thermal properties of Macor machinable glass ceramic is outline in the following table.

Table 2. Thermal properties of Macor machinable glass ceramic

Coefficient of Expansion

Metric

Imperial

-200 - 25°C

74x10-7/°C

41x10-7/°F

25 - 300°C

93x10-7/°C

52x10-7/°F

25 - 600°C

114x10-7/°C

63x10-7/°F

25 - 800°C

126x10-7/°C

70x10-7/°F

Specific Heat, 25°C

.79 KJ/kg°C

0.19 Btu/lb°F

Thermal Conductivity, 25°C

1.46 W/m°C

10.16 Btu in hr ft2°F

Thermal Diffusivity, 25°C

7.3x10-7m2/s

0.028 ft2/hr

Continuous Operating Temperature

800°C

1,472°F

Maximum No Load Temperature

1,000°C

1,832°F

Chemical Properties of Macor Machinable Glass Ceramic

The chemical properties of Macor machinable glass ceramic is outline in the following table.

Table 3. Chemical properties of Macor machinable glass ceramic

Tests

Results

Solution

pH

Time

Temp

Gravimetric

5% HCL
(Hydrochloric Acid)

0.1

24 hrs

95°C

~ 100

0.002 HNO3
(Nitric Acid)

2.8

24 hrs

95°C

~ 0.6

0.1 NaHCO3
(Sodium Bicarbonate)

8.4

24 hrs

95°C

~ 0.3

0.02 Na2CO3
(Sodium Carbonate)

10.9

6 hrs

95°C

~ 0.1

5% NaOH
(Sodium Hydroxide)

13.2

6 hrs

95°C

~ 10

Resistance to water
over time
H2O

7.6

1 day*

95°C

0.01

3 days*

95°C

0.07

7 days*

95°C

9.4

3 days**

95°C

0.06

6 days**

95°C

0.11

*Water not freshened daily **Water freshened daily

Electrical Properties of Macor Machinable Glass Ceramic

The electrical properties of Macor machinable glass ceramic is outline in the following table.

Table 4. Electrical properties of Macor machinable glass ceramic

Dielectric Constant, 25°C

Metric

Imperial

1 KHz

6.03

6.03

8.5 GHz

5.67

5.67

Loss Tangent, 25°C

 

 

1 KHz

4.7x10-3

4.7x10-3

8.5 GHz

7.1x10-3

7.1x10-3

Dielectric Strength (AC) average
(at 12 mil thickness and 25°C)

9.4 KV/mm

785 V/mil

Dielectric Strength (DC) average
(at 12 mil thickness and 25°C)

62.4 KV/mm

5,206 V/mil

DC Volume Resistivity, 25°C

>1016 ohm-cm

>1016 ohm-cm

This information has been sourced, reviewed and adapted from materials provided by Precision Ceramics.

For more information on this source, please visit Precision Ceramics.

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