Case 392 ยท Public preview
Surface High Points Can Prevent Complete Adhesive Bondline Fill
Layered transducer structures delaminated at an adhesive interface between a rough backing element and a gold-plated ceramic.
Optical microscopySEMEDSFractographySurface-texture comparison
What the evidence preview establishes
Incomplete adhesive fill most likely caused the delamination. High points on the rough backing surface appeared to set the bondline gap, leaving substantial regions of the opposing gold-plated ceramic with little or no adhesive contact.
Why this case matters
A nominal adhesive area is not necessarily an effective bonded area. Measure both opposing surface textures and verify that adhesive volume and pressure fill the gap established by the highest asperities.
Full evidence reserved for MEMBER and STOREThe complete case includes the evidence sequence, four interpreted figures, alternative explanations, limitations, and practical application guidance.