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Macor – machinable glass-ceramic

Macor is a trademark for machinable glass-ceramics developed and sold by Corning inc. The material is popular because it belongs to the group of ceramic materials which can be machined with standard metalworking tools. The material has a white appearance and is made out of a composition of mica and borosilicate glass.

 

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Machinable glass-ceramic is relatively easy to machine compared with other ceramic material and is often applied for prototypes, small series and complex designs. Because it has almost the same expansion coefficient as steel it is easy to combine in steel assemblies.

Macor

Machinable glass ceramic is ideal material for prototypes and complex designs.

Key characteristics
  • Good electrical insulator
  • Low thermal conductivity
  • Easy machinable
  • Zero porousity
  • Easy to polish
Applications
  • Insulator
  • Prototypes
  • High vacuum applications
  • Laser technology
  • Coil support
This is often the case for small complex parts in low quantities, but the base material is quite expensive compared to other materials. It can therefore be worthwhile to investigate whether alumina or zirconia might be a better priced alternative.
The max dimensions for a part are 300x300x55mm. Equivalent materials are available in larger sizes.
Yes we can do this, but in most cases we supply the machined part to our client. This avoid any pollution to your machine park and at the same time we check/investigate if the part can be produced more economically using another material.
Unlike most other ceramic materials machinable glass-ceramic can be machined in its final state. Therefore it is not necessary to form the material before firing.
Electrical properties
Mechanical properties
Thermal properties
Temperature application
Properties Density g/cm3 Porosity % Mechanical properties Hardness (Vickers) kg/mm2 Compressive strength N/mm2 Bending strength N/mm2 E-modulus kN/mm2 Weibull modulus m Fracture toughness K1c Mpam Coefficient of friction Thermal properties
(Max. use temperature) *in air ℃ *in inert atm. ℃ Thermal shock resistance Expansion coefficient *20C - 200C *20C - 600C *20C - 1000C Thermal conductivity at 20C W/mK Electrical properties (Resistivity) * at 20C ohm cm * at 400C ohm cm * at 1000C ohm cm
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