Beta 1


Title Thermal Stability of Electroformed Microcomponents
Author Schmidt, Gitte
Supervisor Somers, Marcel A. J. (Department of Management Engineering, Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark)
Tang, Peter Torben (Department of Management Engineering, Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark)
Rasmussen, Anette Alsted (Department of Management Engineering, Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark)
Institution Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark
Thesis level Master's thesis
Year 2002
Abstract The thermal stability of nickel and nickel cobalt (23 wt.% Co) were investigated. The metals were electrodeposited from three different baths. Bath  and  produced pure nickel deposits, where the only difference between them was the addition of CH3COONa•3H2O to . The alloy was deposited from the -bath made by adding CoCl2•6H2O to the -bath. The different deposits were heat treated at 100C, 250C, 400C and 550C respectively followed by hardness measurements to determine the thermal stability. Microstructure and grain orientation were also investigated. The -bath produced deposits with a hardness of ~200 HV25 and showed no signs of thermal stability. The -bath made inconsistent deposits with varying hardness between the two sides of the specimen. The hardness of the as deposited layer varied between 190 HV25 and 500 HV25. The hard deposit was thermally stable up to 100C for 60 minutes. The alloy had a hardness of 425 HV25 and was thermally stable at 250C for 2 hours, but for less than 15 minutes at 550C. The alloy was the thermally most stable deposit investigated during the project. All the plated materials had a fibre structure and a preferred orientation of the grains. The as deposited material had a lot of dislocations, while the heated material was almost dislocation free and had a large amount of growth twins.
Imprint Technical University of Denmark (DTU) : Kgs. Lyngby, Denmark
Pages 103
Fulltext
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Admin Creation date: 2011-03-30    Update date: 2011-03-30    Source: dtu    ID: 275799    Original MXD