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Alleviating Residual Stress in Ceramic-Metal Joints

Wed, 16 March, 2022

TWI has successfully completed a Defence and Security Accelerator (DASA) project to investigate the effects of joint design and the use of interlayers to alleviate residual stresses typically present in ceramic-to-metal joints.

These residual stresses are commonly a function of a coefficient of thermal expansion mismatch.

TWI engineers, Kandarp Amin and Madie Allen successfully completed the Joint Effort - Phase 2 project for DASA and DSTL, investigating base materials including alumina, silicon nitride and titanium with joints formed using Ticusil® active metal braze alloy.

The study combined numerical modelling with experimental trials and mechanical testing to evaluate, assess and compare the joint designs.

The results from the trials found that joint designs could significantly improve the tensile strength of ceramic-metal joints.

Kandarp and Madie will be presenting results of the project at the DASA Showcase event at The Kia Oval on 22 March 2022.

This Defence and Security Accelerator (DASA) competition seeks proposals for innovative joining technologies that enable the use of advanced materials and/or designs on military platforms in land, sea and air environments.

If you are interested in finding more about this project, you can find us at the DASA Showcase event or contact us below.

Figure 1. Alumina-Interlayer-Titanium demonstrator component
Figure 1. Alumina-Interlayer-Titanium demonstrator component

For more information please email: