Development of Ceramic-to-Ceramic and Ceramic-to-Metal Joining
Sponsor DOE Office of Fossil Energy

DOE National Energy Technology Laboratory
Sponsor Contacts Fred M. Glaser

Udaya S. Rao
Organization Pacific Northwest National Laboratory
Contact Scott Weil
The purpose of this project is to develop the enabling sealing technology for high-efficiency, low-emissions fossil energy conversion, in support of the DOE Office of Fossil Energy Clean Coal and Vision 21 programs.
This project is focused on the development of the seals that are required to hermetically join inorganic membranes used in high-temperature gas separation to the underlying support structure of the separation system.

The seal materials must not only be compatible with both the membrane and support materials, but must also be physically and chemically stable at the temperatures, pressures, gas atmospheres, and thermal cycling conditions typical of the electrochemical separation processes employed with gasified coal and air.

The types of membrane materials that are being developed by the Office of Fossil Energy include microporous alumina and cerate-based perovskites for the separation of hydrogen from coal gas and syngas and transition metal oxide perovskites and brownmillerites for the separation of oxygen from air.

This project will aid in the deployment of these inorganic membranes to extract and utilize clean hydrogen from coal.
Alumina Joining: Cross-sectional SEM micrographs of braze/alumina interfaces: (a) CA8020, (b) CA6931, (c) CA6040, and (d) CA0199.

Each specimen was heated in air at a final soak temperature of 1000° C, except for the joint containing the CA8020 braze which was heated to 1100° C.

YSZ to FeCrAlY Joining: Cross-sectional SEM micrograph of an as-brazed YSZ/FeCrAlY joint.
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