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Ceramika narzędziowa na osnowie tlenku glinu z udziałem stałych środków smarnychh

Kamil Broniszewski

Abstract

Many developing industries are looking for newer and newer construction and tool materials. First of all, attention is focused on composite materials that allow for a great freedom in designing their microstructure. This involves the possibility of producing composite materials with desired properties. Alumina ceramic, due to its properties and low price, is a material widely used as a composites matrix. It is characterized by low thermal shock resistance and that is why it is used in dry machining. In the 80’s when the costs of cutting fluids were very low, dry machining was reluctant to apply. Nowadays when environmental protection has left its mark on the costs of cutting fluids, it has a chance to become a significant type of machining process. This paper presents the results of research and cutting tests of composite alumina matrix cutting tools with the addition of metallic phases of molybdenum or vanadium. Like all the ceramic materials, corundum is characterized with low fracture toughness which could lead to cutting edge chipping. The introduced metallic phases increase the fracture toughness of composites and provide a self-lubricating properties for a cutting tool during dry machining process. Thermally activated metallic phase oxidation in the surface layer of the cutting tool leads to the formation of metal oxides characterized with graphite-like structure (MoO3 and V2O5). This results in reduction of friction coefficient in the cutting edge-workpiece contact zone. Due to the occurrence of the oxidation process only on the surface of cutting tool, the metallic phases can still act as a factor increasing fracture toughness of a composite in the whole of its volume. Tools life of produced cutting tools were compared to the commercial alumina matrix cutting tool with addition of ceramic phases. Under the same machining parameters it was observed that produced Al2O3-Mo and Al2O3-V composites cutting tools are characterized with significantly higher tool life than commercial cutting tool.
Record ID
WUT0523c34c6dc54804802d3f7964419ed1
Diploma type
Doctor of Philosophy
Author
Kamil Broniszewski Kamil Broniszewski,, Division of Ceramic Materials and Polymers (FMSE/DSMP)Faculty of Materials Science and Engineering (FMSE)
Title in Polish
Ceramika narzędziowa na osnowie tlenku glinu z udziałem stałych środków smarnychh
Language
(pl) Polish
Certifying Unit
Faculty of Materials Science and Engineering (FMSE)
Discipline
material sciences and engineering / (technology domain) / (technological sciences)
Status
Finished
Start date
28-06-2013
Defense Date
19-12-2014
Title date
19-12-2014
Supervisor
Pages
131
Keywords in English
s
Abstract in English
Many developing industries are looking for newer and newer construction and tool materials. First of all, attention is focused on composite materials that allow for a great freedom in designing their microstructure. This involves the possibility of producing composite materials with desired properties. Alumina ceramic, due to its properties and low price, is a material widely used as a composites matrix. It is characterized by low thermal shock resistance and that is why it is used in dry machining. In the 80’s when the costs of cutting fluids were very low, dry machining was reluctant to apply. Nowadays when environmental protection has left its mark on the costs of cutting fluids, it has a chance to become a significant type of machining process. This paper presents the results of research and cutting tests of composite alumina matrix cutting tools with the addition of metallic phases of molybdenum or vanadium. Like all the ceramic materials, corundum is characterized with low fracture toughness which could lead to cutting edge chipping. The introduced metallic phases increase the fracture toughness of composites and provide a self-lubricating properties for a cutting tool during dry machining process. Thermally activated metallic phase oxidation in the surface layer of the cutting tool leads to the formation of metal oxides characterized with graphite-like structure (MoO3 and V2O5). This results in reduction of friction coefficient in the cutting edge-workpiece contact zone. Due to the occurrence of the oxidation process only on the surface of cutting tool, the metallic phases can still act as a factor increasing fracture toughness of a composite in the whole of its volume. Tools life of produced cutting tools were compared to the commercial alumina matrix cutting tool with addition of ceramic phases. Under the same machining parameters it was observed that produced Al2O3-Mo and Al2O3-V composites cutting tools are characterized with significantly higher tool life than commercial cutting tool.
Thesis file
  • File: 1
    Broniszewski.pdf
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Citation count
2

Uniform Resource Identifier
https://repo.pw.edu.pl/info/phd/WUT0523c34c6dc54804802d3f7964419ed1/
URN
urn:pw-repo:WUT0523c34c6dc54804802d3f7964419ed1

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