Thesis Defense Announcement

Herff College of Engineering announces the Final Thesis Defense of

Prashant Parajuli

for the Degree of Master of Science

February 21, 2019 at 11:30 AM in Engineering Science Building, Room 335

Advisor: Ranganathan Gopalakrishnan

Dense Coating of Hydroxyapatite Powder Over Titanium Alloy by Aerosol Deposition Method

ABSTRACT: Aerosol Deposition Method is a technique in which micro or nano particles are deposited onto a substrate at room temperature, without the need for sintering and without the use of any solvent. In this method, powders of primary size of nano or micrometers are aerosolized and are accelerated through the nozzle onto the substrate with high kinetic energy. Upon the impaction onto substrate, the kinetic energy of the particles is converted into the compressible strain energy which causes the deformation of substrate and the particle itself gets fractured. Because of this, the particles get attached to the substrate to form a fine coating at room temperature. Particles used in this study are made up of hydroxyapatite which is a naturally occurring mineral form of calcium phosphate. Substrate used in this study is Titanium alloy (Ti64). The goal is to form a dense, compact and uniform layer of hydroxyapatite coating over Titanium alloy. The size and nature of powder, nature of substrate, kinetic energy provided and the deposition pressure, all come into account to form a fine coating. These types of coating have immense potential for dental and other biomedical implants.