Theses and Dissertations

Date of Award

5-2020

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Physics

First Advisor

Dr. Karen S. Martirosyan

Second Advisor

Dr. Ahmed Touhami

Third Advisor

Dr. HyeongJun Kim

Abstract

Laminated composites have been widely used in weight critical structures, such as aircraft, spacecraft, bullet-proof vests, radiation protection suits, spacesuits etc., owing to their high stiffness, strength, and thermal stability. Multi Wall Carbon Nanotube (MWCNT) laminar composite have attracted a good attention for these laminar composites due to its outstanding physical and mechanical properties as well as extraordinary electrical, optical, and thermal properties. Laminar composite structures based on twisted MWCNT yarn were crafted by integrating titanium and graphene mixture at (80:20) wt. %, respectively into multi wall carbon nanotube sheets. Titanium and Graphene mixture addition has been used to improve the mechanical properties of MWCNTs based composites structures through in situ formation of TiC. We produced this homogeneous powder mixture by using MSK-SFM-3 high speed vibrating ball miller. Afterwards the twisted yarn incorporated with powder mixture was heated up to 800 °C in Differential Scanning Calorimetry (DSC) to initiate the reaction between titanium and graphene, and an exothermic reaction has been observed at 642 °C. The formation mechanisms of TiC production inside yarn were studied by using differential scanning calorimetry (DSC), XRD, and SEM to identify the reaction products in different temperature ranges. The characteristics X-ray peaks of the TiC phase were well observed on 2θ =34, 36, 41. We have also investigated MWCNT/TiC based composite morphology, TiC particles size and elemental atomic by using the thermal field emission Scanning Electron Microscope (SEM, JOEL) equipped with an Electron Dispersive X-ray Spectroscopy. Form the experimental results, it has been shown that the as-prepared laminar composites possess a better comprehensive performance. Our synthesized laminar composite structures exhibit the tensile strength of 320 MPa which is worthy of comparison to the results available in literature.

Comments

Copyright 2020 Rakibul Alam Shohan. All Rights Reserved.

https://go.openathens.net/redirector/utrgv.edu?url=https://www.proquest.com/dissertations-theses/multi-wall-carbon-nanotube-mwcnt-laminar/docview/2454639505/se-2?accountid=7119

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