A study of static and kinetic friction

Tribo-electrification mechanism for self-mated metals in dry severe wear process: Part II: pure soft metals

Tribo-electrification mechanism for self-mated metals in dry severe wear process

Wear resistance of nickel-fly ash composite coatings

Iron alloyed Ni3Al with composition of Ni-18. 8A1-10. 7Fe0. 5Mn-0. 5Ti-0.2B in atom percent (NAC alloy)
showed attractive tribological properties under unlubrication condition at room temperature. The alloy was prepared
by hot isostatic pressing (HIP) process. The wear properties were associated with its intrinsic deformation mechanism.
Unfortunately, the single phase NAC-alloy worked inadequately with its counterpart disk, and also showed a
poor machinability. In the present work, NAC-alloy matrix composite with 6% (volume percent) MnS (manganese sulfide
)particle addition was studied to improve its wear behaviors and performance on machining. Two metallurgical processes of HIP and vacuum casting were applied to produce the testing materials. Pin-on-disk (POD) measurements were carried out
at room temperature. A commercial vermicular graphite cast iron was selected as a reference material. The counterpart
disk was made of a grey cast iron as liner material in ship engines. The contact pressures of 2. 83 MPa and 5. 66 MPa
were normally applied in the tests. The investigation indicated that MnS particle addition in the NAC-alloy composites
functions as an effective solid lubricant, and improved wear properties and machinability of the materials. Obviously,
as-cast NAC-alloy with in-situ formed MnS phase was working more effectively with the counterpart, comparing
to the HIPed NAC-alloy composite with MnS particles. At the high contact pressure of 5.66 MPa, the specific
wear rate of the as-cast NAC-alloy composite was high. The phenomenon of the negative effect is mostly due to the
brittle second NiAl phase as evidenced in the microstructure analysis.

/pdf/wear-evaluation-on-ni3al-mns-composite-related-to-mve0zfy9iu.pdf

Y.C. Chiou

Papers

The effect of normal damping in the loading system on the wear of low carbon steel