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Carbon Limits for Dielectric Glass-Ceramic

IP.com Disclosure Number: IPCOM000120854D
Original Publication Date: 1991-Jun-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Natarajan, GA: AUTHOR [+2]

Abstract

Residual carbon leftover from binder removal during firing of glass- ceramic substrates strongly affects the dielectric properties of sintered glass-ceramic. High residual carbon values result in unacceptably high dielectric constant and dielectric loss values. A maximum residual carbon limit in sintered glass-ceramic is proposed to meet the dielectric specifications.

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Carbon Limits for Dielectric Glass-Ceramic

      Residual carbon leftover from binder removal during
firing of glass- ceramic substrates strongly affects the dielectric
properties of sintered glass-ceramic.  High residual carbon values
result in unacceptably high dielectric constant and dielectric loss
values.  A maximum residual carbon limit in sintered glass-ceramic is
proposed to meet the dielectric specifications.

      Fig. 1 shows the exponential dependence of dielectric constant
on residual carbon concentration.  Fig. 2 shows the similar
exponential dependence of dielectric loss on carbon concentration.
Carbon concentrations up to 300 ppm do not result in increased
dielectric constant or dielectric loss. Above 300 ppm of carbon both
the dielectric constant and dielectric loss begin to increase
exponentially and rapidly reach unacceptable values for electronic
substrates.  300 ppm is proposed as the upper limit of residual
carbon for glass-ceramic substrates.