New x-ray nondestructive evaluation techniques for studying microstructural homogeneity of green ceramics

Huss, Simon Peter

doi:10.31274/rtd-180813-10848

Cited by 1 publication

(1 citation statement)

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“…(C) Measurement Errors: According to Ting 10 and Huss, 11 the errors involved in the density measurement using this X-ray line scanning system come from two sources: Poisson counting statistics and beam intensity fluctuations. Both errors, if not controlled, would lead to unacceptably small signal-to-noise ratios.…”

Section: (2) X-ray Tomography For Green Joint Characterizationmentioning

confidence: 99%

X‐ray Tomography Study on Green State Joining of Silicon Carbide Using Polymer Precursors

Zheng

Beckman

Gray

et al. 2001

Journal of the American Ceramic Society

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X-ray tomography has been used to investigate the density variations in SiC joints formed using polymer pastes. It has been demonstrated that X-ray tomography provides accurate bulk density measurements and volumetric density gradients. The results suggest that the magnitude of the applied pressure after green state joining and the amount of polymer (polycarbosilane, PCS) in the joining pastes influence the green density of the joints. All joints are prepared and applied in air atmosphere and at room temperature. The green densities of the joints increase from 54% to 66% of theoretical with the increase of the applied pressure from ambient to 138 MPa. Highest joint density without applied pressure is achieved using paste containing 50 vol% PCS. Furthermore, allylhydridopopolycarbosilane-(AHPCS-) containing pastes resulted in higher densities at the joint-matrix interface, indicating infiltration of polymer into the matrix.

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Section: (2) X-ray Tomography For Green Joint Characterizationmentioning

confidence: 99%