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Journal of Materials Science

, Volume 29, Issue 17, pp 4436–4446 | Cite as

Characterization of glass-ceramic to metal bonds

  • I. A. Ashcroft
  • B. Derby
Papers

Abstract

Glass-ceramic thick films were deposited on copper and copper/invar/copper substrates by screen printing and subsequent firing in a belt furnace. One lithium-zinc silicate glass and two lithium-aluminosilicate glasses were deposited. Microstructures of the coatings and the coating/substrate interfaces were studied using optical and electron optical techniques. SEM was used to investigate the glass-ceramic microstructure and EPMA to characterize chemical composition across the interface. Crystalline phases were identified using X-ray and electron diffraction. The lithium-aluminosilicate glass-ceramics were composed of lithium disilicate, β-spodumene and quartz crystals in residual glass. Lithium disilicate and quartz were the only crystals identified in the lithium-zinc silicate glass-ceramic. In all the samples copper diffused extensively through the glass-ceramic during firing and formed Cu2O precipitates in the glass-ceramics adjacent to the interface. Strong adhesion between the glass-ceramic and the substrates is promoted by copper diffusion and oxide development at the glass-ceramic/substrate interface. The strongest bonds develop when the Cu2O forms as discrete particles rather than a continuous layer at the interface. Interfacial residual stress also influences the measured adhesion strength.

Keywords

Residual Stress Cu2O Screen Printing Disilicate Sample Copper 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • I. A. Ashcroft
    • 1
  • B. Derby
    • 1
  1. 1.Department of MaterialsUniversity of OxfordOxfordUK

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