Microstructure and mechanical properties of silicon carbide-titanium diboride ceramic composites
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The work Microstructure and mechanical properties of silicon carbide-titanium diboride ceramic composites represents a distinct intellectual or artistic creation found in University of Missouri Libraries. This resource is a combination of several types including: Work, Language Material, Books.
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Microstructure and mechanical properties of silicon carbide-titanium diboride ceramic composites
Resource Information
The work Microstructure and mechanical properties of silicon carbide-titanium diboride ceramic composites represents a distinct intellectual or artistic creation found in University of Missouri Libraries. This resource is a combination of several types including: Work, Language Material, Books.
- Label
- Microstructure and mechanical properties of silicon carbide-titanium diboride ceramic composites
- Statement of responsibility
- by Derek Scott King
- 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
- Cataloging source
- UMR
- 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
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