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Characterization of Sapphire

Title: Characterization of Sapphire: for Its Material Properties at High Temperatures.
Name(s): Bal, Harman Singh, author
Oates, William S., professor directing thesis
Kumar, Rajan, committee member
Hellstrom, Eric, committee member
Florida State University, degree granting institution
College of Engineering, degree granting college
Department of Mechanical Engineering, degree granting department
Type of Resource: text
Genre: Text
Issuance: monographic
Date Issued: 2015
Publisher: Florida State University
Place of Publication: Tallahassee, Florida
Physical Form: computer
online resource
Extent: 1 online resource (55 pages)
Language(s): English
Abstract/Description: There are numerous needs for sensing, one of which is in pressure sensing for high temperature application such as combustion related process and embedded in aircraft wings for reusable space vehicles. Currently, silicon based MEMS technology is used for pressure sensing. However, due to material properties the sensors have a limited range of approximately 600°C which is capable of being pushed towards 1000°C with active cooling. This can introduce reliability issues when you add more parts and high flow rates to remove large amounts of heat. To overcome this challenge, sapphire is investigated for optical based pressure transducers at temperatures approaching 1400°C. Due to its hardness and chemical inertness, traditional cutting and etching methods used in MEMS technology are not applicable. A method that is being investigated as a possible alternative is laser machining using a picosecond laser. In this research, we study the material property changes that occur from laser machining and quantify the changes with the experimental results obtained by testing sapphire at high-temperature with a standard 4-point bending set-up. Keywords: Sapphire, Bayesian analysis, thermomechanics, alumina
Identifier: FSU_2015fall_Bal_fsu_0071N_12982 (IID)
Submitted Note: A Thesis submitted to the Department of Mechanical Engineering in partial fulfillment of the requirements for the degree of Master of Science.
Degree Awarded: Fall Semester 2015.
Date of Defense: November 9, 2015.
Keywords: Anisotropy, Laser ablation
Bibliography Note: Includes bibliographical references.
Advisory Committee: William S. Oates, Professor Directing Thesis; Rajan Kumar, Committee Member; Eric Hellstrom, Committee Member.
Subject(s): Engineering
Persistent Link to This Record:
Host Institution: FSU

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Bal, H. S. (2015). Characterization of Sapphire: for Its Material Properties at High Temperatures. Retrieved from