Active brazing alloy process enables ceramic-to-metal bonding

25th November 2014
Posted By : Barney Scott
Active brazing alloy process enables ceramic-to-metal bonding

Morgan Advanced Materials has highlighted the benefits of its Active Brazing Alloy (ABA) process to join metals to ceramics in a variety of applications where conventional metallisation and brazing are either costly or impractical. The ABA process is currently used in specialist applications in sectors including medical and aerospace.

Morgan believes ABA's versatility means it could be even more widely employed in future, especially given the increased use of ‘hybrid’ components pairing metals with ceramics to benefit from the different performance properties of each, not least in high-volume manufacturing.

Unlike some other techniques, the ABA process allows accurate brazing of components in hard-to-access locations, such as tube interiors, where previously a metallising paint or ink, as well as a traditional brazing alloy, would be needed. The ABA process therefore gives greater flexibility, not just in terms of design, but in terms of the combinations of materials which can now be bonded together.

Examples of technologies being bonded using ABAs include proton therapy equipment for oncology, and high-tech circuit boards to which conductive strips can be bonded using just a thin ABA layer with no need for a costly and time-consuming physical vapour deposition process.

The ABA process produces well-contained braze joints that do not ‘run’ over a ceramic surface, ensuring pre-formed products remain true to their original shape and enabling even very small parts to be successfully brazed.

Morgan’s Martin Davidson explained: “The ABA process is a highly effective way to join metal and ceramic components together, forming a mechanically strong, hermetic joint. In many applications, it is considerably quicker and more cost-effective than standard metallisation, providing real alternatives for engineers, especially where multi-layered ceramics are being used. Thanks to their high peel strength, ABA assemblies are the option of choice for butt joint design. Also assemblies produced through the ABA process can operate in temperatures up to 650°C.

“The joint strength will be design-dependent but also linked to the silicon content in the materials being brazed. The lower the silicon content, the stronger the joint will be. This allows us to braze high purity aluminium oxide ceramics from 97 to 99.9% purity to metals, and also zirconia, silicon carbide and sapphires. We can also actively braze metal to metal. Morgan’s service includes the joint design, which is critical to allow for the differing coefficients of expansion between dissimilar materials. Parts produced with the ABA process do not readily react with other materials, making them compliant with regulations governing medical implants, a key attribute and one which is bound to appeal to designers creating components for use in harsh or sensitive environments.”

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