NDE Reliability and Process Control for Structural Ceramics | Zendy

George Y. Baaklini | Zendy

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NDE Reliability and Process Control for Structural Ceramics

Author(s) -

George Y. Baaklini

Publication year - 1987

Publication title -

journal of engineering for gas turbines and power

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.567

H-Index - 84

eISSN - 1528-8919

pISSN - 0742-4795

DOI - 10.1115/1.3240034

Subject(s) - materials science , flexural strength , reliability (semiconductor) , silicon carbide , silicon nitride , ceramic , sintering , composite material , modulus , radiography , silicon , metallurgy , medicine , radiology , power (physics) , physics , quantum mechanics

The reliability of microfocus x-radiography and scanning laser acoustic microscopy for detecting microvoids in silicon nitride and silicon carbide was statistically evaluated. Materials- and process-related parameters that influenced the statistical findings in research samples are discussed. The use of conventional x-radiography in controlling and optimizing the processing and sintering of an Si3N4-Si02-Y203 composition designated NASA 6Y is described. Radiographic evaluation and guidance helped develop uniform high-density Si3N4 modulus-of-rupture bars with improved four-point flexural strength (857, 544, and 462 MPa at room temperature, 1200 C, and 1370 C, respectively) and reduced strength scatter.

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