Title

Rapid Freeze Spraying of Graded Laminar Composites

Presenter Information

Ashlee Abbott

Department

Materials Science and Engineering

Major

Ceramic Engineering

Research Advisor

Dogan, Fatih

Advisor's Department

Materials Science and Engineering

Funding Source

Center for Aerospace Manufacturing Technologies; Air Force Research Laboratories; Boeing Phantom Works

Abstract

Laminar composites are needed for many applications ranging from structural materials to aerospace engine components to biomedical implants. Unfortunately, different expansion coefficients of materials cause them to separate during sintering which can lead to failure of the composite samples. This project optimizes and employs rapid freeze spraying technology to fabricate prototypes with graded alumina and zirconia structures in order to form gradual transitions between coefficients of thermal expansion.

Rapid freeze spraying significantly decreases costs for manufacturing because sample fabrication time decreases and expensive dies are no longer required. The process is also environmentally friendly because the materials used possess a low organic content. In addition, our research has shown that graded composites with gradual transitions between coefficients of thermal expansion are less susceptible to crack formation during sintering. This can lead to tougher materials for practical applications as structural components.

Biography

Ashlee Abbott is a freshman undergraduate at the University of Missouri--Rolla, majoring in Ceramic Engineering. She has been researching composite samples since May 2005.

Research Category

Engineering

Presentation Type

Poster Presentation

Document Type

Poster

Presentation Date

12 Apr 2006, 1:00 pm

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Apr 12th, 1:00 PM

Rapid Freeze Spraying of Graded Laminar Composites

Laminar composites are needed for many applications ranging from structural materials to aerospace engine components to biomedical implants. Unfortunately, different expansion coefficients of materials cause them to separate during sintering which can lead to failure of the composite samples. This project optimizes and employs rapid freeze spraying technology to fabricate prototypes with graded alumina and zirconia structures in order to form gradual transitions between coefficients of thermal expansion.

Rapid freeze spraying significantly decreases costs for manufacturing because sample fabrication time decreases and expensive dies are no longer required. The process is also environmentally friendly because the materials used possess a low organic content. In addition, our research has shown that graded composites with gradual transitions between coefficients of thermal expansion are less susceptible to crack formation during sintering. This can lead to tougher materials for practical applications as structural components.