Wear resistant vapor deposited coating method of coating...

C - Chemistry – Metallurgy – 23 – C

Patent

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C23C 14/02 (2006.01) A61C 1/00 (2006.01) C23C 14/06 (2006.01) C23C 16/02 (2006.01) C23C 28/00 (2006.01)

Patent

CA 2652586

A low friction top coat (74) over a multilayer metal /ceramic bondcoat (70) provides a conductive substrate (68), such as a rotary tool, with wear resistance and corrosion resistance. The top coat further provides low friction and anti- stickiness as well as high compressive stress. The high compressive stress provided by the top coat protects against degradation of the tool due to abrasion and torsional and cyclic fatigue. Substrate temperature is strictly controlled during the coating process to preserve the bulk properties of the substrate and the coating. The described coating process is particularly useful when applied to shape memory alloys.

Une couche de finition à coefficient de frottement réduit déposée sur une couche d'accrochage métallique/céramique à couches multiples fournit un substrat conducteur, de type instrument rotatif, possédant une résistance à l'usure et une résistance à la corrosion. La couche de finition fournit également un coefficient de frottement réduit et une anti-adhérence ainsi qu'une contrainte de compression élevée. La contrainte de compression élevée fournie par la couche de finition protège contre la dégradation de l'instrument provoquée par l'abrasion et par la fatigue de torsion et par la fatigue cyclique. La température du substrat est strictement contrôlée pendant le processus de revêtement de manière à conserver les propriétés générales du substrat et du revêtement. Le procédé de revêtement décrit est particulièrement utile dans des applications d'alliages à mémoire de forme.

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