Nanoscale Particles Enhanced Gold Plating

2011 ◽  
Vol 320 ◽  
pp. 210-215 ◽  
Author(s):  
Jian Song ◽  
Christian Koch ◽  
Liang Liang Wang ◽  
Srecko Stopic ◽  
Jelena Bogovic ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Gold Alloy ◽  
Precious Metals ◽  
Electrical Contacts ◽  
Gold Plating ◽  
Effective Measure ◽  
Nanoscale Particles ◽  
First Results ◽  
Considerable Impact ◽  
Gold Plates

Using precious metals as plating materials is an effective measure to avoid failures of electrical contacts caused by fretting. When using precious metals, such as gold, one of the limitations to their lifetime is the wear resistance. In order to improve the wear resistance of gold plates, gold alloy is usually used. Instead of alloying elements, nanoscale particles of metal oxides were used for the modification of plates in our investigation. Some of the nanoscale particles show considerable impact on the performance of plates for electrical contacts. This paper shows the first results and new challenges when using nanoscale particles for electroplating.

Wear of Electric Contact Surfaces

2007 ◽  
Author(s):  
J. Song
Keyword(s):  
Wear Resistance ◽  
Precious Metals ◽  
Electrical Contacts ◽  
Fretting Corrosion ◽  
Coating Materials ◽  
Long Term Stability ◽  
Electric Contacts ◽  
Contact Surfaces ◽  
Contact Shape

Fretting corrosion is one of the important factors which limits the lifetime of electric contacts. In order to avoid fretting corrosion coatings of different precious metals are used. The wear resistance of the coating determines the lifetime of electrical contacts. The long term characteristics of gold coated electrical contacts with different additives and contact shapes are investigated and the results are analyzed. It is found out that the wear resistance of contact coating can be largely influenced by the amount of the additive in gold and by the design of the contact shape. Only the combination of an optimized contact shape with suitable coating materials leads to a long term stability of electric contacts.

Migration of Silver Through Gold Plating on Electrical Contacts

1972 ◽  
Author(s):  
Stewart B. Tulloch ◽  
Ronald G. Britton
Keyword(s):  
Electrical Contacts ◽  
Gold Plating

scholarly journals Effect of a Metal Priming Agent on Wear Resistance of Gold Alloy-indirect Composite Joint

2007 ◽  
Vol 26 (2) ◽  
pp. 201-208 ◽  
Author(s):  
Tomohisa OGINO ◽  
Hiroyasu KOIZUMI ◽  
Mika FURUCHI ◽  
Mahoko MURAKAMI ◽  
Hideo MATSUMURA ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Gold Alloy ◽  
Composite Joint ◽  
Indirect Composite

An Investigation of Methods to Improve the Wear Resistance of Gas-Bearing Ceramic Materials

1968 ◽  
Vol 90 (4) ◽  
pp. 829-838
Author(s):  
H. H. Rowe
Keyword(s):  
Wear Resistance ◽  
Chemical Vapor ◽  
High Hardness ◽  
Ceramic Materials ◽  
Gold Plating ◽  
Good Surface ◽  
Irradiation Treatment ◽  
Vapor Deposition Technique ◽  
Good Surface Finish ◽  
Gas Bearing

Ceramic materials, or more particularly aluminum oxides, have found application as a practical gas-bearing material because of the dimensional stability, low coefficient of friction, high hardness, and ability to attain good surface finish that these materials possess. This paper reports on an investigation of a number of methods designed to improve the resistance of aluminum oxide to damage from sliding contact, and hence improve the start-stop life characteristics of gas-bearing assemblies. These methods include heat-treatment, neutron irradiation treatment, gold plating, and coating of alumina surfaces by means of a chemical vapor deposition technique, in order to increase the wear resistance of the material. A brief mention is also made of the effect of machining techniques as they relate to the finish, and hence to the wear resistance, of gas-bearing parts.

Laser cladding of copper with molybdenum for wear resistance enhancement in electrical contacts

2007 ◽  
Vol 253 (14) ◽  
pp. 6236-6241 ◽  
Author(s):  
K.W. Ng ◽  
H.C. Man ◽  
F.T. Cheng ◽  
T.M. Yue
Keyword(s):  
Wear Resistance ◽  
Laser Cladding ◽  
Electrical Contacts

Effects of TiO2 sol on the microstructure and properties of Au–Co coatings

2017 ◽  
Vol 31 (16-19) ◽  
pp. 1744028
Author(s):  
See Leng Tay ◽  
Jowin Van Vliet ◽  
Yuxin Wang ◽  
Fengyan Hou ◽  
Chao Xiong ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Wear Resistance ◽  
Service Life ◽  
Surface Morphology ◽  
Electrical Contacts ◽  
Alloying Element ◽  
Plating Bath ◽  
Short Service Life ◽  
Tio2 Sol

Gold (Au) coatings are widely used for electrical contacts in devices, decoration and jewelry. However, the relatively low hardness and poor wear resistance of pure Au coatings lead to a short service life and limit their application. Ni is frequently used as an alloying element to enhance the hardness but it lowers the conductivity of Au coatings. In this research, Co was co-deposited as an alloying element with Au to improve its mechanical properties while maintaining conductivity. TiO2 sol in different concentrations was added to the Au–Co plating bath to further enhance the coating strength. Systematic studies including surface morphology, hardness, wear resistance and electrical conductivity have been carried out. Key results from nanoindentation tests demonstrated that the hardness of Au–Co–TiO2 composite coating was increased by 30% when compared to a pure Au–Co coating, while the electrical conductivity has been kept at the same level.

The Early Iron Age Treasure from Snettisham Norfolk

1955 ◽  
Vol 20 (1) ◽  
pp. 27-86 ◽  
Author(s):  
R. Rainbird Clarke ◽  
R. H. M. Dolley
Keyword(s):  
Iron Age ◽  
Gold Alloy ◽  
Precious Metals ◽  
Class I ◽  
Early Iron Age ◽  
North West ◽  
Metal Work

This paper describes and discusses a group of five hoards of metal-work and coins found in 1948–50 by ploughing supplemented by excavation at Ken Hill, Snettisham, in north-west Norfolk. On account of the large quantity of precious metals included the find has been termed collectively ‘The Snettisham Treasure.’ Its principal contents are as follows:—Hoard A (p. 36) contained the remains of four gold tubular torcs. Hoard B contained three staters, four quarter-staters of the Bellovaci; four staters and one quarter-stater of the Gaulish Atrebates, all of gold (p. 59): Hoard C contained at least 145 speculum (tin) coins of Allen's Class I (p. 72) and three buffer terminal bronze torcs (p. 52). From Hoards B and C came at least 48 loop terminal torcs of gold alloy, bronze and tin (p. 46); 17 ‘ingot-bracelets’ of bronze and tin (p. 52) 14 rings of gold alloy, bronze and tin (p. 54); U-shaped bronze binding (p. 56); fragment of a bronze bridle bit (p. 57); two dome-shaped bronze rivets (p. 57); 10 iron nails (p. 58) and miscellaneous fragments of sheet-bronze and ‘cake’ of gold alloy and tin (pp. 57–58). Hoard D consisted of a gold loop terminal torc (p. 46) with securing ring of gold (p. 54). Hoard E contained the following gold objects: ring terminal torc (p. 63) with quarter-stater of Gaulish Atrebates (p. 59); bracelet (p. 66) and large buffer terminal torc (p. 67).

scholarly journals Microstructures and Wear Resistance of Laser Melting Deposited Composites on Ati-Alloy

2013 ◽  
Vol 22 (2) ◽  
pp. 096369351302200
Author(s):  
Li Peng
Keyword(s):  
Wear Resistance ◽  
Sliding Wear ◽  
Dry Sliding Wear ◽  
Micro Hardness ◽  
Laser Melting ◽  
Laser Technology ◽  
Nanoscale Particles ◽  
Laser Melting Deposition ◽  
First Time ◽  
Scanning Electron

This work is based on the dry sliding wear of Stellite 4-FeSi-B4C composites deposited on a TA10 titanium alloy using a Laser melting deposition (LMD) technique, the parameters of which are such as to provide almost crack-free composites with very low porosity. To our knowledge, it is the first time that Stellite4-FeSi-B4C mixed powders are deposited as the hard composites by the LMD technique. Scanning electron microscope results indicate the nanoscale particles and nanorods are produced in such composites. Furthermore, due to the characteristics of the laser technology, the ultrafine nanoscale polycrystalline phases can be easily produced. Compared with a TA10 alloy substrate, the improvements of the micro-hardness and wear resistance are obtained for such composites.

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