Friction and Wear Behavior of Thermally Sprayed
Al-Cu-Fe
Quasicrystal Coatings
Steven De Palo, Saifi Usmani, and Sanjay Sampath
DAn J. Sordelet* and MATT BESSER*
ABSTRACT
-
quasicrystals are a new class of materials that can be applied by thermal
spray methods to improve the wear resistance of soft metallic alloys.
-
The insights into the properties of quasicrystals provided by this work
are directed towards putting these materials into engineering use.
-
In this study, abrasive and sliding wear tests were performed and related
to wear surfaces to understand the relationships between coating microstructure,
phase content, and tribological behavior.
|
Coating Label
|
Coating Condition |
Hardness (HV0.025) |
Phases
Present |
| A |
As-sprayed |
620±
125 |
y
and b |
| B |
As-sprayed |
730±
198 |
y
and b |
| AA |
Annealed |
827±
175 |
y |
Table 1. Average surface hardness of the coatings.
Figure 1. Abrasion results for the as-sprayed and annealed coatings.
* Ames Laboratory, Ames, Iowa
Figure 2. Coefficient of friction versus sliding distance
for (a) A; (b) B; and (c) AA.
RESULTS
-
1. The as-sprayed coatings contained a combination of a quasicrystalline
y phase and a cubic b
phase. The cubic b phase was dissolved upon
annealing (Table 1).
-
2. The annealed coating proved to be harder and more abrasion
resistant than the as-sprayed coatings (Table 1 & Fig. 1).
-
3. The as-sprayed coatings displayed a very low coefficient
of friction compared to the annealed coatings (Fig.2).
back to the Nuggets page
back to the Center for Thermal Spray Research
12/30/98 VG