Title

Optimization of Novel Ceramic to Metal Joints for High Temperature and Pressure Applications

Document Type

Student Presentation

Presentation Date

4-16-2018

College

College of Engineering

Department

Materials Science and Engineering

Faculty Sponsor

Brian J. Jaques

Abstract

The goal of this project is to develop a novel joining technique to diffusion bond ceramic to metal tubes for high-temperature, high-pressure heat-exchanger applications. This project uses a novel U-ring concept, which provides a seal through temperature (800 °C) and pressure (3000 psi) cycling typical of a supercritical CO2 heat exchanger. Silicon carbide was bonded to stainless steels using silver interlayer foils and a cermet powder. In order to gain insight into the bonding behavior and strengths, orthogonal test specimens were ground and polished prior to bonding experiments. The effects of temperature, holding time, and applied pressure on the joint adhesion and diffusion layers were analyzed. Joint adhesion and chemical diffusion were characterized using scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDS), and optical microscopy, which provides information about the morphology, structure, phase distribution, chemical composition, and compositional differences within the joint components. Optimization of the joint is possible due to understandings achieved through design of experiments coupled with finite element analysis (FEA).

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