Interactions between lead oxide and ceramic substrates for thick film technology

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作者
Bersani, Massimo [1 ]
Morten, Bruno [1 ]
Prudenziati, Maria [1 ]
Gualtieri, Alessandro [1 ]
机构
[1] Univ of Modena, Modena, Italy
关键词
Activation energy - Alumina - Composition effects - Crystal microstructure - Crystallization - Granular materials - Interfaces (materials) - Lead compounds - Reaction kinetics - Substrates - Thick films;
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摘要
This paper deals with the mechanisms and kinetics of interactions between screen printed and fired PbO layers and ceramic substrates: alumina and beryllia. The interaction with alumina occurs via two main processes: (i) a reaction between PbO and Al2O3 grains, which induces the formation of a crystalline phase, Pb2Al2O5; and (ii) an interdiffusion process involving Pb and the intergranular amorphous phase in the ceramic substrate. This latter process results in a compositional change of the intergranular phase at considerable depths inside the ceramic substrate, as well as in the formation of a high lead glass layer on the substrate surface. Since PbO is not completely reacted, the Pb penetration in the ceramic is diffusion limited (penetration depth wtd1/2, where td is the reaction time) with an activation energy of 1.20±0.05 eV. The ceramic microstructure significantly affects the interaction processes.
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