Tewari, J P and Singh, S K and Premchand, (1995) Preparation of electroless copper-graphite composite powder for application in avionics industries. NML Technical Journal, 37 (1). pp. 1-11.
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The copper graphite composite powder prepared by Electroless Method is found superior due to its homogeneous and reproducible structure to those manufactured by blending, electroplating and cementation processes. The material produced from this technique would help in achieving better electrical and lubricating properties and could be used in motor and generators of aircraft. The co-deposited powder was prepared by adjusting the composition of the ingredients particularly graphite, formaldehyde and Rochelle salt in the weight ratio of 1:3.5:5 at ambient temperature and pH13. The controlled agitation of the bath and use of a wetting reagent helped in removal of entrapped H2, which minimized the expansion during sintering. The evaluation of the properties revealed that the composite powder possessed higher green and sintered densities. The compacts also exhibited improved mechanical properties due to its better compressibility and uniformity. The microstructure showed negligible segregation than those prepared from the conventional mixed powder. Thus the composite powder appears to be a superior feed stock for the manufacture of aviation grade brushes.
|Uncontrolled Keywords:||Copper graphite composite powder ; co-deposited powder ; Aviation grade brushes|
|Divisions:||Metal Extraction and Forming|
|Deposited By:||Sahu A K|
|Deposited On:||14 Sep 2010 13:40|
|Last Modified:||27 Mar 2012 16:31|
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