Probability of Detection of Internal Voids in Structural Ceramics Using Microfocus Radiography

Baaklini, George Y.; Roth, Don J.

doi:10.1557/proc-60-273

Cited by 8 publications

(7 citation statements)

References 6 publications

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“…Then, t h e scanned area must be s e v e r a l o r d e r s s m a l l e r . These l a t t e r SAM d e v i c e s a c h i e v e h i g h e r m a g n i f i c a t i o n s and u s u a l l y o p e r a t e a t t r a n s d u c e r f r e q u e n c i e s approaching 1 …”

Section: Sanning Acoustic Microscopy (Sam)mentioning

confidence: 99%

Ultrasonic NDE of structural ceramics for power and propulsion systems

Vary

Generazio²,

Roth³

et al. 1990

NDT International

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N a t i o n a l A e r o n a u t i c s and Space A d m i n i s t r a t i o n Lewis Research C e n t e r Cleveland, O h i o 44135and George Y. Baak.1 i n i C l e v e l a n d S t a t e U n i v e r s i t y Cleveland, O h i o 44112 SUMMARYA r e v i e w i s p r e s e n t e d on r e s e a r c h i n v e s t i g a t i o n s o f s e v e r a l u l t r a s o n i c e v a l u a t i o n t e c h n i q u e s a p p l i c a b l e t o s t r u c t u r a l ceramics f o r advanced h e a t e n g i n e s . T h i s r e v i e w h i g h l i g h t s r e c e n t work conducted under t h e s p o n s o r s h i p o f and a t t h e Lewis Research C e n t e r . R e s u l t s o b t a i n e d w i t h scanning a c o u s t i c microscopy, scanning l a s e r a c o u s t i c microscopy, p h o t o a c o u s t i c m i c r o s c o p y , and s c a n n i n g e l e c t r o n a c o u s t i c microscopy a r e compared. I i m a g i n g t e c h n i q u e s , m i c r o s t r u c t u r e c h a r a c t e r i z a t i o n b y a n a l y t i c a l u l t r a s o n i c s i s d e s c r i b e d . The t e c h n i q u e s were e v a l u a t e d b y a p p l i c a t i o n t o r e s e a r c h samples of m o n o l i t h i c s i l i c o n n i t r i d e and s i l i c o n c a r b i d e i n t h e form o f d i s c s and b a r s c o n t a i n i n g n a t u r a l l y -o c c u r r i n g and d e l i b e r a t e l y -i n t r o d u c e d f l a w s and m i c r os t r u c t u r a l anomalies. S t r e n g t h s and l i m i t a t i o n s o f t h e t e c h n i q u e s a r e d i s c u s s e d .

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Section: Sanning Acoustic Microscopy (Sam)mentioning

confidence: 99%

Ultrasonic NDE of structural ceramics for power and propulsion systems

Vary

Generazio²,

Roth³

et al. 1990

NDT International

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“…Sintered Si3N4 specimens containing seeded internal voids were fabricated by using the processing steps shown in the figure and described in detail by Baaklini (1986). Briefly, plastic microspheres of various sizes were embedded in green specimens and later burned out to create voids within sintered specimens.…”

Section: Specimen Preparationmentioning

confidence: 99%

Flaw characterization in structural ceramics using scanning laser acoustic microscopy

Roth¹

1990

NDT International

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“…Microfocus radiography was used to evaluate the tensile specimens before loading and after failure because of its high resolution capabilities. 8 …”

Section: Radiographic Evaluationmentioning

confidence: 99%