Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Wettability

The Effect of Adding Nickel Element on Mechanical and Wear Properties of SiCp-Cu Composites

Samir B. Younis

Engineering and Technology Journal, 2010, Volume 28, Issue 21, Pages 6228-6236

Reinforced composites are prepared from a Copper as a matrix with SiC
powder in different percentage ( i.e 5-25 vol.%) .For each prepared reinforced
composite with respect to SiC addition , they divided into two parts , one undergo to
addition of Ni in fixed percentage (2 wt%) and the other part leave without addition.
After drying , mixing and milling process, disc samples were prepared . these
samples were heat treated at (900°C) using furnace at argon atmosphere. Density,
porosity, Vicker microhardness , compressive strength were performed. Dry sliding
wear tests of Cu–SiCp composites were carried out using pin on disc apparatus with a
typical experimental plan of simultaneous variation of loads (5,10)N . The results
show that the density was decreased while porosity increased with SiC content , and
this was less remarkable with nickel presence. Vicker microhardness, compress
strength were improved by the nickel wettability on the reinforcement. Moreover
decreasing in wear rate comparing with the absence one. The nickel presence modifies
the interface structural model and is effective in passing load between the matrix and
the reinforcement, by lessening the extent of interfacial debonding.

Wettability of Al2O3 by Aluminum and Al-Mg Alloys

M. S. Waheed; Ali I. Salih

Engineering and Technology Journal, 2010, Volume 28, Issue 9, Pages 1771-1777

The wettablity at a liquid of pure-Al or Al-Mg alloys/ Al2O3 interface was
evaluated by the sessile drop method at 700oC and with a vacuum pressure of
10-4Pa. The value of contact angle varies (decreases) with time of contact with
Al2O3 substrate. The reduction in θ of the Al-Mg alloy was proportional to the
reduction in surface tension γlv of Al, and to reactions that took place at the Alalloy/
Al2O3 interface.