| 1. |
- Ahmadkhaniha, Donya, et al.
(författare)
-
Study of the effect of pulse plating parameters on the electrodeposition of NiP and NiP/SiC coatings and their microhardness values
- 2021
-
Ingår i: Transactions of the Institute of Metal Finishing. - : Taylor & Francis. - 0020-2967 .- 1745-9192. ; 99:1, s. 29-37
-
Tidskriftsartikel (refereegranskat)abstract
- This study is focused on finding optimised conditions for electrodeposition of NiP and NiP/SiC coatings, which enhance the coatings' microhardness. Both the effect of particles and the effect of heat treatment at 400°C for 1 h on the microhardness of the coating were studied. The effects of pulse electrodeposition parameters including duty cycle, frequency, and peak current density on the composition of NiP and NiP/SiC composite coatings were examined, and the results were compared with those from direct current plating. Pulse plating increased the current efficiency of NiP deposition while decreasing the phosphorus content of these coatings in comparison to direct plating, resulting in higher microhardness values. It was also shown that wt.%P in NiP coating depends not only on peak current density but also on bath charge of pulse plating. Pulse plating parameters (duty cycle and frequency) and the low incorporation of SiC particles did not affect microstructure or the microhardness of the coatings, while heat treatment was the main factor that increased microhardness.
|
|
| 2. |
|
|
| 3. |
- Gunnarsson Sarius, Niklas, 1976-, et al.
(författare)
-
Influence of ultrasound and cathode rotation on the formation of intrinsic stress in Ni films during electrodeposition
- 2011
-
Ingår i: Transactions of the Institute of Metal Finishing. - : Institute of Metal Finishing. - 0020-2967 .- 1745-9192. ; 89:3, s. 137-142
-
Tidskriftsartikel (refereegranskat)abstract
- The influence of 25 kHz ultrasound and cathode rotation during electroplating of Ni films on Si wafers has been studied with respect to intrinsic stress formation. Current densities from 1.6 A dm-2 up to 28.3 A dm-2 were used in an additive-free Ni sulphamate electrolyte. In general more efficient agitation by either ultrasound or cathode rotation was found to reduce intrinsic stress towards compressive levels compared to conventional agitation with an electrolyte circulation pump. Further more, intrinsic stresses become less dependent on changes in current density. The latter effect is most pronounced for ultrasonic agitation. Structure analysis of samples deposited by ultrasonic agitation show dense deposits with initially smaller grains at high ultrasonic effect. Locally increased temperature at the substrates surface could be an important effect of ultrasound agitation.
|
|
| 4. |
|
|
| 5. |
- Klement, Uta, 1962, et al.
(författare)
-
Development of advanced hybrid materials with the help of pulse electrodeposition
- 2015
-
Ingår i: Transactions of the Institute of Metal Finishing. - 1745-9192 .- 0020-2967. ; 93:6, s. 296-301
-
Tidskriftsartikel (refereegranskat)abstract
- Pulse-electrodeposition has been applied to enhance properties of two different types of lightweight construction materials, a periodic cellular material (PCM) and a micro-sandwich. For the PCM, the deformation behaviour of the nanocrystalline Ni-18wt.%Fe sleeve material (bulk samples) has been investigated up to 548 K. The material exhibits plasticity of >30% fracture strain at higher temperatures compared to
|
|
| 6. |
- Klement, Uta, 1962, et al.
(författare)
-
Mid-term meeting of SELECTA: a European Training Network on smart electrodeposited alloys for environmentally sustainable applications
- 2017
-
Ingår i: Transactions of the Institute of Metal Finishing. - : Informa UK Limited. - 1745-9192 .- 0020-2967. ; 95:3, s. 124-125
-
Tidskriftsartikel (refereegranskat)abstract
- Integrating sustainability with technologicalprogress is becoming oneof the major challenges in modernsociety. Since research agendas aremainly driven by the push for incessanteconomic growth, there is therisk of reaching a critical point wheretechnological advances will nolonger be possible due to the imbalancebetween demand and availabilityof natural resources. To facethis issue, the European TrainingNetwork ‘Smart ELECTrodepositedAlloys for environmentally sustainableapplications: from advancedprotective coatings to micro/nanoroboticplatforms’ (SELECTA) waslaunched in January 2015. SELECTAaims to integrate technological progresswith environmental sustainabilityconcerns, which is one of themajor ‘Societal Challenges’ listed inthe Horizon 2020 Work Programme.
|
|
| 7. |
- Klement, Uta, 1962, et al.
(författare)
-
Thermal stability of nanocrystalline Ni- and Co-based pulsed current electrodeposits: correlation of calorimetric measurements and microstructure development upon annealing
- 2017
-
Ingår i: Transactions of the Institute of Metal Finishing. - : Informa UK Limited. - 1745-9192 .- 0020-2967. ; 95:1, s. 20-24
-
Tidskriftsartikel (refereegranskat)abstract
- The exceptional properties associated with nanocrystalline materials are, to a large extent, a resultof their high inter-crystalline volume fraction. However, the intrinsic instability of the nanostructuredstate may compromise the gain in properties by the occurrence of grain growth during exposure atelevated temperatures. Thermal stability is, therefore, a fundamental materials issue fornanocrystalline materials. This article describes what can be deduced from calorimetricmeasurements in the context of what is known about the microstructural evolution uponannealing of nanocrystalline Ni- and Co-based pulsed current electrodeposits. Specialemphasis is put on interpreting the shape of the curves obtained by a differential scanningcalorimetry (DSC). The temperature ranges for relaxation, segregation, precipitation, as well asabnormal and normal grain growth can be predicted. Also, by evaluating the shift in peaktemperature with heating rate (Kissinger plot), the activation energies for grain growth can beobtained for the different materials.
|
|
| 8. |
|
|
| 9. |
|
|
| 10. |
|
|
