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- W1875496697 abstract "A novel spiral architecture was formed using titanium diboride and silicon carbide ceramics as either the spiral or matrix phase. Particulate composites with the same compositions were fabricated to compare to the materials in this study. Spiral additions were formed using powder loaded polymers followed by a single and/or multifilament co-extrusion. For 25 vol% SiC spiral additions to TiB2, boron nitride was added to the SiC spiral to alter the bonding at the interface and reduce thermal residual stresses. All samples were hot-pressed to near full density at 1980 °C. Hot pressed multifilament co-extrusion of 2.4 mm / 1 mm resulted in the smallest, consistent spirals ~50 μm in diameter. For the SiC spirals in TiB2 study, the room temperature flexure strength was 193 ± 17 MPa, with the particulate composite being 488 ± 45 MPa. The fracture toughness for the spiral material was as high as 7.5 ± 0.6 MPa·m with the particulate composite being 5.3 ± 0.4 MPa·m. Spiral length was studied with TiB2 spirals in a SiC matrix. The resulting average room temperature flexure strength was 313 ± 11 MPa and 417 ± 41 MPa for spiral and monolithic samples, respectively. Fracture toughness was increased from 4.2 ± 0.2 MPa·m for the monolithic to 6.2 ± 0.4 MPa·m with the addition of spirals. The higher fracture toughness is a result of crack deflection in and around the spiral inclusions. Wear testing resulted in a loss of 1.1 mm and 3.3 mm per 6000 revolutions for monolithic and uniaxial specimens, respectively. While more wear was observed, the strength of the uniaxial samples after wear increased 16% whereas monolithic strength decreased 18%." @default.
- W1875496697 created "2016-06-24" @default.
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- W1875496697 date "2014-01-01" @default.
- W1875496697 modified "2023-09-27" @default.
- W1875496697 title "Development and characterization of spiral additions in a ceramic matrix" @default.
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