Co-sintering of metal-ceramic laminates with consideration of aniso-tropic shrinkage

Contact

Name

Chao Liu

Group Process Technology

Phone

work
+49 241 80 96291

Email

E-Mail
 

Motivation

The multitude of possible properties and combinations gives metal-ceramic laminates a high degree of flexibility. However, a major challenge is the identification of compatible materials for which the existing different shrinkage rate during the sintering process does not lead to production errors or undesired deformations. In practice, this identification of a defect-free design of near-net-shape laminates is still frequently based on the "trial and error" principle, which results in a high failure rate and requires a long development period. Therefore, there is a high demand for simulation methods that allow the prediction of deformation and manufacturability during the sintering process. Furthermore, it is necessary to accurately predict the thermal stress during co-sintering and the remained residual stresses after co-sintering process in order to ensure the reliability of metal-ceramic laminates as structural components.

Goals

  • Prediction of thermal stress development and deformation of metal-ceramic laminates during co-sintering with consideration of the anisotropy of the microstructure and properties of the individual components
  • Development of the experimental methods for determination of material properties and model parameters from anisotropic microstructure for the sintered model

Contents

  • Characterisation of single layer component from ZrO2 (3Y-TZP) and 17-4PH (X5CrNiCuNb17-4-4)
  • Measurement of the residual stress of ZrO2/17-4PH laminates
  • Numerical simulation of the direction-dependent sintering behaviour of ZrO2 and 17-4PH layers with external /without external load and under consideration of the anisotropy of the microstructures
  • Prediction of the reliability and survival probability of the ZrO2/17-4PH laminates

Project Partner

  • Fraunhofer IKTS (Dresden)
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Funding

Grant number: 441616349