Title page for ETD etd-81297-151452

Type of Document Master's Thesis
Author Kuhr, Thomas A.
Author's Email Address tkuhr@vt.edu
URN etd-81297-151452
Title Adhesion Strength of Cordierite Bulk Coatings on Molybdenum Substrates
Degree Master of Science
Department Materials Science and Engineering
Advisory Committee
Advisor Name Title
Aning, Alexander O.
Hendricks, Robert W.
Lu, Guo-Quan Committee Chair
  • interfacial fracture toughness
  • adhesion
  • ceramic-metal bonds
Date of Defense 1997-07-23
Availability unrestricted
Cordierite was adhered to molybdenum using various metallic

interlayers of copper, nickel, and chromium. The

development of a coating adhesion test methodology was

required to choose between interface designs. An

indentation method was chosen because of ease in testing

and availability of fracture mechanics interpretations

of test data. The interfacial fracture toughness was

determined from indentation load vs. crack length data

by examining the residual stress and critical buckling

load of the ceramic coatings. The interfacial fracture

toughness values obtained using a slightly different

indentation analysis agree with those in the literature.

Quantitative chemical analysis of the interface

microstructure was used to explain differences in

interfacial fracture toughness values for samples

with different metallic interlayer designs. The best

interface design for adhering cordierite glass-ceramic

coatings to molybdenum was found to be molybdenum /

2 mm copper / 4 mm chromium / cordierite.

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