Spark Plasma Joining of Ultra-High Temperature Ceramics Without the Use of Filler Materials

Technology #ua12-005

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Categories
Researchers
Zachary Wing
Director, Research
Luke Walker
Postdoctoral Research Associate II, Materials Science & Engineering
William Pinc
Postdoctoral Research Associate I, Materials Science & Engineering
Erica Corral
Assistant Professor, Materials Science & Engineering
Managed By
Robert Sleeper
Licensing Manager (520) 626-4604

Background

Ceramic materials have exceptional high temperature properties, which make them ideal materials for high temperature applications.  However, costs associated with post processing machining and integrating ceramics with other materials for use in complex material systems limits their use in many engineering applications.  Therefore, a joining method that is cost effective, reliable, and a rapid process would enable the integration of ceramics into metallic, ceramic, or composite systems. 

 

Invention

This invention’s approach to solving this problem uses direct current heating to rapidly join two conductive ceramics with seamless joint microstructures.  Conventional ceramic joining methods include brazing, transient liquid phase bonding, or mechanical fasteners.  Although these methods are widely used and are reliable for most applications, they do have limitations form a production cost and application properties standpoint.  These limitations are: 1) extended brazing time period (>4 hours) due to radiative heating methods, 2) inhomogeneous joint microstructures resulting form filler or braze materials reacting with the base material, and 3) low application temperature due to low melting point brazes or glass materials used with respect to the base ceramic.  These issues are of particular concern for ceramic materials to be used in extreme heat (>1800 C) such as aerospace vehicles, which are intended for operation at speed greater than mach 4 while maintaining mechanical and thermal properties under extreme aero-thermal heating loads.

Application

This novel technology approaches to solve the issues of joining multiple ceramic materials or ceramic materials to different surfaces.  This invention can be applied to biomedical, electronics, aerospace, optical, automotive, and military technologies. 

Advantages

The invention, spark plasma joining without filters, is a more advantageous joining method compared to previously reported techniques because it rapidly produces a homogeneous joint microstructure, which exhibits identical properties to the baseline substrates.  Other joining methods use brazes with compositions varied from the substrates, which in turn produces joints with microstructures significantly different than the substrates, resulting in dimensioned joint properties. 

 

Inventor

Erica Corral

Assistant Professor

Materials Science and Engineering

 

Stage of Development

Proof of Concept: Fully Developed

 

Case Number

UA12-005

 

Licensing Manager:

Robert Sleeper

RobertS@tla.arizona.edu

(520) 626-4604