Title :
Automated stress control of electroplated nickel-phosphorus alloy
Author :
Yu, George ; Williams, Martin ; Horng, Tzu-Chern ; Huang, I.B.
Author_Institution :
Dept. of Mech. Mater. Eng., Nat. Huwei Inst. of Technol., Taiwan
Abstract :
A process for automatic control of internal stress in electroplated nickel-phosphorus alloy using controlled current electrodeposition on a conductive substrate from a single electroplating bath yields a multiple-layered coating. This multi-layered deposit is a sequence of two alternating layers. One of these layers is a phosphorus-rich coating which is characterized by compressive stresses while the other layer is a tensile-stressed coating of low phosphorus content. The apparatus employed to achieve this automated control of internal stress includes a non-contact linear sensor for monitoring stresses in the coating and a programmable power supply for the current source
Keywords :
electric current control; electric sensing devices; electroplating; nickel alloys; process monitoring; stress control; NiP; automated stress control; compressive stresses; conductive substrate; controlled current electrodeposition; electroplated nickel-phosphorus alloy; electroplating bath; internal stress; multiple-layered coating; noncontact linear sensor; phosphorus-rich coating; programmable power supply; tensile-stressed coating; Automatic control; Coatings; Compressive stress; Computerized monitoring; Current supplies; Internal stresses; Nickel alloys; Sensor phenomena and characterization; Stress control; Tensile stress;
Conference_Titel :
Intelligent Processing and Manufacturing of Materials, 1999. IPMM '99. Proceedings of the Second International Conference on
Conference_Location :
Honolulu, HI
Print_ISBN :
0-7803-5489-3
DOI :
10.1109/IPMM.1999.791487
