News

Glass ceramic additive manufacturing presented by Corning and Lithoz
 
Published Friday, October 18, 2019
by Robert Quinn at Corning, [email protected] or Shawn Allan at Lithoz America, LLC, [email protected]

Corning and Lithoz recently embarked on a collaboration to open additive manufacturing to the unique properties achieved by glass ceramics.

Since their invention in the 1950’s, glass ceramic materials have been used in diverse and specialized applications due to their ability to combine two or more properties in a way not easily accessible in any other material. What is more, glass ceramic materials demonstrate considerable advantages over inorganic materials – such as greater chemical durability than the precursor glass, superior mechanical toughness, high resistance to radiation damage, piezoelectricity and electro-optic effects among others.

As an inventor of glass ceramic materials, Corning has mastered the development of tailor-made glass ceramic materials for use in diverse fields. It is introducing a glass ceramic that presents advantages for additive manufacturing such as lower sintering temperatures and no need for polishing.


Lithoz' Lithography-based Ceramic Manufacturing (LCM) enables formation of high quality advanced ceramics.  The additive manufacturing process, originally developed at the Technical University of Vienna, uses light to structure ceramic powders suspended in a photopolymer resin.  Lithoz' ceramic printers yield a green-body ceramic that can then be debinded and fired similar to other ceramic processes.  

Recently, Lithoz LCM process was applied to a Corning glass ceramic.  Slurry made of Corning glass ceramic powder and Lithoz resin system was produced, and parts were formed on a Lithoz CeraFab printer.  The glass ceramic was then sintered and annealed in Corning's thermal process. The result was the achievement of complex, high resolution glass ceramic pieces meeting Corning's property specs.

For more information contact Robert Quinn at Corning, [email protected] or Shawn Allan at Lithoz America, LLC, [email protected]








Accompanying Images & Data

 

Property

Value

Fired density (g/cm³)

2.69 - 2.7

Biaxial flexure strength (MPa)

152 - 172

CTE at 25 -300 °C (ppm/°C)

2.4 – 2.8

K, dielectric constant

4.8 – 5.2

Log of resistivity

12 - 14

Thermal diffusivity at 25 °C 

(mm²/s)

1.12

Specific heat at 25 °C (J/g·K)

0.76

Thermal conductivity,

Green glass at 25 °C (W/m·K)

0.99

Thermal conductivity,

Glass ceramic at 25 °C (W/m·K)

2.25

Mass losses in acid (mg/dm²)

405

Mass losses in bases (mg/dm²)

41

 

 


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