Doctoral Dissertations

Keywords and Phrases

Thermodynamics; Thin-strip casting; Kinetics

Abstract

"The focus of this research was to investigate the corrosion behavior of BN-based and ZrO2-C refractories by molten steel. These refractories are used as side-dam and core-nozzle in the thin-strip casting of steel. The improvement and development of these refractory components will increase the process efficiency by prolonging the refractory service life.

The first part of this study focused on interaction of BN-ZrO2-SiC side-dams with steel-inclusion system in a laboratory setup under argon gas environment. It was observed that corrosion of this ceramic was severe in contact with steel compared to slag/inclusion.

The second part of this study shows the results of corrosion behavior of BN-ZrO2-SiC against molten steel under nitrogen gas environment. The corrosion behavior was studied using isothermal corrosion test with different surface area to volume ratios for steel and refractory. The corrosion process involved dissolution of BN and SiC and removal of ZrO2.

In the third part, a comparative study was conducted to identify the corrosion mechanism of BN-ZrO2 and BN-ZrO2-SiC by molten steel in nitrogen environment. The degradation process begins with oxidation of BN(s) and SiC(s) at temperature above 1400⁰C followed by direct dissolution of solids in molten steel and gas transport due to volatilization of BN(s) and SiC(s). In the fourth part, industrial ZrO2-C core-nozzles were investigated to understand their corrosion behavior. The corrosion process involved oxidation of carbon and leaching of CaO from cubic-ZrO2."--Abstract, page iv.

Advisor(s)

Smith, Jeffrey D.

Committee Member(s)

Robertson, D. G. C.
Lekakh, S. N. (Semen Naumovich)
O'Malley, Ronald J.
Fahrenholtz, William

Department(s)

Materials Science and Engineering

Degree Name

Ph. D. in Metallurgical Engineering

Sponsor(s)

NUCOR Castrip

Publisher

Missouri University of Science and Technology

Publication Date

Spring 2015

Journal article titles appearing in thesis/dissertation

  • Interaction of BN-ZrO2-SiC Ceramics with Inclusions in Si-Killed Steel
  • Kinetics of Corrosion of BN-ZrO2-SiC Ceramics in Contact with Si-Killed Steel
  • Corrosion Mechanism of BN-ZrO2 and BN-ZrO2-SiC Composites in Liquid Steel
  • Behavior of ZrO2-C Refractories in Thin-Strip Casting of Steel

Pagination

xvi, 194 pages

Note about bibliography

Includes bibliographic references.

Rights

© 2015 Abhishek Kumar, All rights reserved.

Document Type

Dissertation - Open Access

File Type

text

Language

English

Subject Headings

Metal castingsSteel -- CorrosionRefractory materials -- Corrosion -- TestingCorrosion and anti-corrosives -- TestingSteel -- Deoxidizing

Thesis Number

T 10718

Electronic OCLC #

913398310

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Included in

Metallurgy Commons

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