Publication

Résistance mécanique à court terme des substrats en alumine [Short-term strength of alumina substrates]

Thomas Maeder
2001
Reports

Abstract

Cette étude porte sur le comportement à la rupture à court terme de substrats en alumine, en flexion 3 points. A ce titre, on a étudié différentes nuances (pureté 96% ou 99.6%), différents processus de séparation (rayage + cassage, découpe laser), ainsi que l'effet de recuits ultérieurs. La rupture est presque toujours dominée par les défauts aux bords, provenant du rayage ou de la découpe laser. La seule méthode de fabrication semblant atteindre la résistance "intrinsèque" du substrat est le rayage + cassage, mais seulement sur la face non rayée. La perte de résistance due au rayage augmente avec l'épaisseur du substrat. L'utilisation d'alumine 99.6% permet dans de bonnes conditions un gain de signal d'env. 30%.

Official source

https://infoscience.epfl.ch/entities/publication/0e20b998-2873-4006-ad16-6c2e8523a52c

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Thomas Maeder
2001
Reports

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/0e20b998-2873-4006-ad16-6c2e8523a52c

About this result

Related concepts (6)

Signal transduction

Signal transduction is the process by which a chemical or physical signal is transmitted through a cell as a series of molecular events. Most commonly, protein phosphorylation is catalyzed by protein kinases, ultimately resulting in a cellular response. Proteins responsible for detecting stimuli are generally termed receptors, although in some cases the term sensor is used. The changes elicited by ligand binding (or signal sensing) in a receptor give rise to a biochemical cascade, which is a chain of biochemical events known as a signaling pathway.

Signalling theory

Within evolutionary biology, signalling theory is a body of theoretical work examining communication between individuals, both within species and across species. The central question is when organisms with conflicting interests, such as in sexual selection, should be expected to provide honest signals (no presumption being made of conscious intention) rather than cheating. Mathematical models describe how signalling can contribute to an evolutionarily stable strategy.

Aluminium oxide

Aluminium oxide (or Aluminium(III) oxide) is a chemical compound of aluminium and oxygen with the chemical formula . It is the most commonly occurring of several aluminium oxides, and specifically identified as aluminium oxide. It is commonly called alumina and may also be called aloxide, aloxite, or alundum in various forms and applications. It occurs naturally in its crystalline polymorphic phase α-Al2O3 as the mineral corundum, varieties of which form the precious gemstones ruby and sapphire.