Theses and Dissertations

Date of Award

12-2021

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Manufacturing Engineering

First Advisor

Dr Jianzhi Li

Second Advisor

Dr. Ahmed Farid

Third Advisor

Dr. Ben Xu

Abstract

Natural titanium diboride (TiB2) has been reported the 5th hardest material on earth. Due to its superior properties, such as high density, high elastic modulus, and high compressive strength, TiB2 becomes one of the most suitable ceramic reinforcements for applications with severe friction and heavy loading conditions. This study is intended to produce TiB2 using 3D additive manufacture (AM) technology, and then to understand the tribological property of the AM fabricated TiB2 specimens. In this study, a laser additive alloying (LAA) process was developed based on a Renishaw AM laser system. One mm thick samples were prepared using the LAA process. Tribological properties of the TiB2 fabricated under different processing parameters including 1) laser power (60W, 100W, and 140W) and 2), scanning speed (0.20 m/s, 0.375 m/s, and 0.70 m/s), were studied via a wear test. Surfaces of the TiB2 specimens were analyzed before and after the wear test by scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS). Moreover, a microhardness test was performed in the corresponding samples to study relationships between the hardness and the wear properties. Surprisingly, the wear test showed that higher hardness due to high-power laser was related to lower wear resistance.

Comments

Copyright 2021 Lazaro Lopez Mendez. All Rights Reserved.

https://go.openathens.net/redirector/utrgv.edu?url=https://www.proquest.com/dissertations-theses/selective-laser-melting-titanium-diboride-study/docview/2637158799/se-2?accountid=7119

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