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The Resource Microstructure and mechanical properties of silicon carbide-titanium diboride ceramic composites, by Derek Scott King

Microstructure and mechanical properties of silicon carbide-titanium diboride ceramic composites, by Derek Scott King

Creator
Author
Summary
"The microstructure, hardness, fracture toughness, Young's modulus, strength and Weibull modulus of silicon carbide-titanium diboride (SiC-TiB2) ceramics were studied. First, SiC-TiB2 ceramics with 15 vol.% TiB2 particles were processed using two green processing methods, spray drying (ST) and ball milling (SiC-15TiB2). In addition, SiC-TiB2 ceramics with TiB2 contents ranging from 0 to 100 vol.% were produced to determine a TiB2 content that produced the best combination of mechanical properties. From spray drying, segregation of the TiB2 particles in ST led to a granule-like microstructure and spontaneous microcracking in the final ceramic. In ceramics containing 20 and 40 vol.% TiB2, the TiB2 particle sizes were also large enough to allow for spontaneous microcracking. Spontaneous microcracking decreased the hardness from 28 GPa for SiC to 24 GPa for SiC-TiB2 with TiB2 contents of 80 vol.% or higher. In contrast, fracture toughness increased from 2 MPa·m1/2 for SiC to 6̃ MPa·m[superscript 1/2] for SiC containing 40 vol.% TiB2 or more. Using a two-parameter Weibull analysis, SiC with 20 vol.% TiB2 had the highest average strength (522 MPa), followed by SiC-15TiB2 (500 MPa), then SiC with 40 vol.% TiB2 (420 MPa), and ST (380 MPa). While microcracking in ST lowered the strength, hardness, and elastic modulus compared to SiC-15TiB2, the granule-like microstructure combined with microcracking, narrowed the flaw size distribution of ST and boosted the Weibull modulus of ST to 21 compared to 12 for SiC-15TiB2, which had a uniform distribution of TiB2 particles. The Weibull moduli of SiC containing 20 and 40 vol.% TiB2 was also boosted to 17, compared to 12 for a TiB2 content of 15 vol.%. To maximize each property, TiB2 particle sizes should be kept just below the spontaneous microcracking threshold to prevent spontaneous flaw formation"--Abstract, page iv
Language
eng
Work
Publication
Extent
1 online resource (xi, 107 pages)
Note
  • Vita
  • This thesis contains two papers for publication
Instance
Label
Microstructure and mechanical properties of silicon carbide-titanium diboride ceramic composites
Title
Microstructure and mechanical properties of silicon carbide-titanium diboride ceramic composites
Statement of responsibility
by Derek Scott King
Creator
Author
Subject
Language
eng
Summary
"The microstructure, hardness, fracture toughness, Young's modulus, strength and Weibull modulus of silicon carbide-titanium diboride (SiC-TiB2) ceramics were studied. First, SiC-TiB2 ceramics with 15 vol.% TiB2 particles were processed using two green processing methods, spray drying (ST) and ball milling (SiC-15TiB2). In addition, SiC-TiB2 ceramics with TiB2 contents ranging from 0 to 100 vol.% were produced to determine a TiB2 content that produced the best combination of mechanical properties. From spray drying, segregation of the TiB2 particles in ST led to a granule-like microstructure and spontaneous microcracking in the final ceramic. In ceramics containing 20 and 40 vol.% TiB2, the TiB2 particle sizes were also large enough to allow for spontaneous microcracking. Spontaneous microcracking decreased the hardness from 28 GPa for SiC to 24 GPa for SiC-TiB2 with TiB2 contents of 80 vol.% or higher. In contrast, fracture toughness increased from 2 MPa·m1/2 for SiC to 6̃ MPa·m[superscript 1/2] for SiC containing 40 vol.% TiB2 or more. Using a two-parameter Weibull analysis, SiC with 20 vol.% TiB2 had the highest average strength (522 MPa), followed by SiC-15TiB2 (500 MPa), then SiC with 40 vol.% TiB2 (420 MPa), and ST (380 MPa). While microcracking in ST lowered the strength, hardness, and elastic modulus compared to SiC-15TiB2, the granule-like microstructure combined with microcracking, narrowed the flaw size distribution of ST and boosted the Weibull modulus of ST to 21 compared to 12 for SiC-15TiB2, which had a uniform distribution of TiB2 particles. The Weibull moduli of SiC containing 20 and 40 vol.% TiB2 was also boosted to 17, compared to 12 for a TiB2 content of 15 vol.%. To maximize each property, TiB2 particle sizes should be kept just below the spontaneous microcracking threshold to prevent spontaneous flaw formation"--Abstract, page iv
Related
Cataloging source
UMR
http://library.link/vocab/creatorDate
1988-
http://library.link/vocab/creatorName
King, Derek Scott
Degree
M.S.
Dissertation year
2012.
Funding information
Funded by Saint-Gobain Advanced Ceramics and the Army Research Laboratory through Cooperative Agreement Number
Granting institution
Missouri University of Science and Technology
Illustrations
illustrations
Index
no index present
Literary form
non fiction
Nature of contents
  • dictionaries
  • bibliography
  • theses
http://library.link/vocab/subjectName
  • Ceramic materials
  • Silicon carbide
  • Composite materials
  • Ceramic materials
  • Composite materials
  • Silicon carbide
Label
Microstructure and mechanical properties of silicon carbide-titanium diboride ceramic composites, by Derek Scott King
Instantiates
Publication
Note
  • Vita
  • This thesis contains two papers for publication
Bibliography note
Includes bibliographical references (pages 100-106)
Carrier category
online resource
Carrier category code
  • cr
Carrier MARC source
rdacarrier.
Content category
text
Content type code
  • txt
Content type MARC source
rdacontent.
Control code
908260225
Extent
1 online resource (xi, 107 pages)
Form of item
online
Media category
computer
Media MARC source
rdamedia.
Media type code
  • c
Other physical details
illustrations.
Specific material designation
remote
System control number
(OCoLC)908260225
Label
Microstructure and mechanical properties of silicon carbide-titanium diboride ceramic composites, by Derek Scott King
Publication
Note
  • Vita
  • This thesis contains two papers for publication
Bibliography note
Includes bibliographical references (pages 100-106)
Carrier category
online resource
Carrier category code
  • cr
Carrier MARC source
rdacarrier.
Content category
text
Content type code
  • txt
Content type MARC source
rdacontent.
Control code
908260225
Extent
1 online resource (xi, 107 pages)
Form of item
online
Media category
computer
Media MARC source
rdamedia.
Media type code
  • c
Other physical details
illustrations.
Specific material designation
remote
System control number
(OCoLC)908260225

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