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  • 1
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    Improved consolidation of silicon carbide (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Alpha silicon carbide powder was consolidated by both dry and wet methods. Dry pressing in a double acting steel die yielded sintered test bars with an average flexural strength of 235.6 MPa with a critical flaw size of approximately 100 micro m. An aqueous slurry pressing technique produced sintered test bars with an average flexural strength of 440.8 MPa with a critical flaw size of approximately 25 micro m. Image analysis revealed a reduction in both pore area and pore size distribution in the slurry pressed sintered test bars. The improvements in the slurry pressed material properties are discussed in terms of reduced agglomeration and improved particle packing during consolidation.
    Keywords: NONMETALLIC MATERIALS
    Type: Ceramic Engineering and Science Proceedings (ISSN 0196-6219); 7; 884-892
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Evaluation of alpha-SiC sintering using statistical methods (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The effect of time and temperature on the density and strength of alpha-SiC was studied and mathematically modeled using a central composite experimental design. A sintering temperature of 2150 C for 1.7 h maximized the flexural strength and densification values. However, temperatures above 2200 C promoted abnormal grain growth, with resulting appreciable decreases in strength. Flexural strength increased exponentially with increasing density for specimens with densities less than or equal to 92 percent of theoretical.
    Keywords: NONMETALLIC MATERIALS
    Type: American Ceramic Society, Communications (ISSN 0002-7820); 68; C-178 to
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Unknown
    Effect of hot isostatic pressing on the properties of sintered alpha silicon carbide (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Two lots of alpha silicon carbide were isostatically hot-pressed under 138 MPa for 2 h in Ar at temperatures up to 2200 C. Nearly theoretically dense specimens resulted. Hot isostatic pressing increased both room-temperature strength and 1200 C strength, and resulted in improved reliability. One lot of material which was pressed at 2200 C showed increases of about 20 percent in room-temperature strength and about 50 percent in 1200 C flexural strength; the Weibull modulus improved about 100 percent.
    Keywords: NONMETALLIC MATERIALS
    Type: American Ceramic Society Bulletin (ISSN 0002-7812); 64; 1253-125
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Unknown
    Effect of hot isostatic pressing on reaction-bonded silicon nitride (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Specimens of nearly theoretical density have been obtained through the isostatic hot pressing of reaction-bonded silicon nitride under 138 MPa of pressure for two hours at 1850, 1950, and 2050 C. An amorphous phase that is introduced by the hot isostatic pressing partly accounts for the fact that while room temperature flexural strength more than doubles, the 1200 C flexural strength increases significantly only after pressing at 2050 C.
    Keywords: NONMETALLIC MATERIALS
    Type: American Ceramic Society, Communications (ISSN 0002-7820); 67; C-208 to
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Unknown
    Improved consolidation of silicon carbide (1986)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Alpha silicon carbide powder was consolidated by both dry and wet methods. Dry pressing in a double acting steel die yielded sintered test bars with an average flexural strength of 235.6 MPa with a critical flaw size of approximately 100 micro m. An aqueous slurry pressing technique produced sintered test bars with an average flexural strength of 440.8 MPa with a critical flaw size of approximately 25 micro m. Image analysis revealed a reduction in both pore area and pore size distribution in the slurry pressed sintered test bars. The improvements in the slurry pressed material properties are discussed in terms of reduced agglomeration and improved particle packing during consolidation.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-TM-87243 , E-2921 , NAS 1.15:87243 , Annual Conference on Composites and Advanced Ceramic Materials; Jan 19, 1986 - Jan 22, 1986; Cocoa Beach, FL; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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