Document GmXx0paZNgNmZGODDYjqj39Vm
MOLYKOTE D-6600 Anti-Friction Coating: A new and innovative coating for service life dry lubrication of engine starter plungers
DuPont Molykote April 2020
Application engine starter plungers
Service life of engine starter plungers can be simulated on a SRV test machine with methodology defined and agreed with a major starter Tier 1 supplier
2 DOW RESTRICTED
Low-pressure steel/steel material pairing test: Conditions
Durability test
Simulation of service life of passenger cars engine starters (linear contact, 100 N/mm2)
SRV 5 test conditions
Specimen arrangement Movement type Coated specimen Cylinder material (name = Zylinder-Rolle) Disc material (art # 291.150.00, Rz=0.45/0.65) Cylinder radius Cylinder length A) load corresponding to 100 N/mm2 SRV stroke SRV cycle stroke Frequency Speed Test length (corresponding to total sliding path)
Cylinder vs. disc Along cylinder axis
Disc 100Cr6 100Cr6 7.5 mm 22 mm
45 N 4 mm 8 mm 40 Hz 0.32 m/s 10.4 h
3
Low-pressure steel/steel material pairing test: Results
SRV durability test - time to seizure
[h]
44% longer
12.0
durability
10.0
8.0
6.0
4.0
2.0
0.0 D-708
D-709
D-7405
D-6600
SRV durability test - dynamic coefficient of friction
0.45 0.40 0.35 0.30 0.25 0.20 0.15 0.10 0.05 0.00
D-708
29% lower friction level
D-709
D-7405
D-6600
MOLYKOTE D-6600 AFC Wear scar after test
4
Low-pressure: comparison PTFE vs MoS2 based AFCs
SRV, linear contact, 100 N/mm2, blasting
SRV low pressure durability test [h]
12.0
10.0
8.0
6.0
4.0
2.0
0.0
D-7409
106
D-6600
D-7409
D-6600
7.5 h
5
10 h
Medium-pressure steel/steel material pairing test: Conditions
Durability test Simulation of an automotive application (linear contact, 250 N/mm2) Cylinder (diameter: 11 mm; length: 15 mm) Disc (100Cr6) Parameters:
- Stroke: 3 mm - Frequency: 25 Hz - Load: 130 N - Contact pressure (theoretical): 250 MPa - Room temperature conditions - Dry lubrication (only AFC) - AFC applied on disc - SRV III DC test machine - Pretreatment: Mn-phosphating
6
Medium-pressure steel/steel material pairing test: Results
SRV durability test - time to seizure
[h]
860% longer
60.0
durability
50.0
40.0
30.0
20.0
10.0
0.0 D-708
D-709
D-7405
D-6600
SRV durability test - dynamic coefficient of friction
0.30
20% lower
0.25
friction level
0.20
0.15
0.10
0.05
0.00 D-708
D-709
D-7405
D-6600
MOLYKOTE D-6600 AFC Wear scar after test
7
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