performance of PEEK composites under the lubrication of ILs Yijun Shi a Jian Wu b Xiaohua Lu b a Division of Machine Elements Luleå University of Technology 97187 ID: 335004
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Slide1
Tribological performance of PEEK composites under the lubrication of ILs
Yijun Shia, Jian Wub, Xiaohua Lub
a
Division of Machine Elements,
Luleå
University of Technology, 97187
Luleå
, Sweden
b
State
Key Laboratory of Materials-oriented Chemical Engineering, Nanjing Tech University, Nanjing 210009, P.R.
ChinaSlide2
OutlineBackground
Motivation & frame of workMaterials preparation and friction testSome results
Wettability of liquid lubricants
Friction coefficient and wear rate
Friction
surface studies—SEM, AFM
and EDX
ConclusionsSlide3
Background
PEEK
High chemical stability
Excellent thermal and mechanical properties
High friction coefficient (µ)
PEEK composites
Gr, PTFE and MoS
2
and etc. as
internal lubricants
S
ome original performance of PEEK such as tensile strength and impact strength will decrease.PEEK under lubricating oil Oil has limited working temperature, pressure...Slide4
Ionic liquids as lubricants
Very low vapor pressure
Non-flammable substance
High thermally stable
High mechanically stable
Electrochemically stableSlide5
Citation ReportTopic=(
polymer + “ionic liquid” + friction OR wear)Timespan=All Years. Databases=SCI-EXPANDED, CCR-EXPANDED, IC.
Most investigations
steel
, titanium, alloy …
polymers
Few investigations
Related results
Almost no study under high applied load
Ionic liquids as lubricants for polymersSlide6
Test propertyWettability of liquid lubricants
Friction coefficient and wear rate3) Worn surfaces
Motivation
& f
rame of work
Mediums
1) Dry condition2) In oil: L-HM 46 (Oil)
3) In ILs: [BMIM]PF6 (IL)
Test conditions:
1) Sliding velocity: 0.7m/s2) Load: 150 N-1500 N (1-10MPa)3) Test time: 60 min
1) Study the t
ribological properties of PEEK composites in ILs; 2) Compare
the lubrication effect of ILs with that of internal lubricant (PTFE) and lubricating oil.Slide7
Materials propertiesTable 1. The Main Properties of L-HM46 and [Bmim][PF6]
External lubricantsL-HM46
[
Bmim
][PF
6
]
Main componentsNeutral mineral oil[Bmim][PF6]
Main multifunctional additiveZDDP (Zn ≤ 0.12 wt%)
/Kinetic viscosity at 40 ºC (mm2/S) 45.989.1 [25]
Viscosity index97172 [26]Surface tension at 40 ºC (mN/m)
43.4-48.831.85 [27]
Density at 20 ºC (kg/m3)
872.81370.0Fig. 1. Chemical structures of PEEK, ZDDP and [Bmim][PF6].Slide8
Fig. 2. Schematic diagram of lubricating ways and frictional contact parts (Unit: mm).Friction and wear testsSlide9
Table 3. The contact angle of L-HM46 and [
Bmim][PF6] on the sliding surfaces.Wettability of liquid lubricants
Number
PEEK composites
Lubricants
1
16
vol%PTFE
/PEEKInternal PTFE
2PEEKExternal L-HM463
PEEKExternal [Bmim][PF6]Table 2. Details of Different Lubricating Systems.
Liquids
Contact angle
PEEKSteelL-HM469.7±1.4° 10.8±1.9° [Bmim][PF6]51.2±1.0°
52.6±1.0°
Slide10
Anti-friction/wear performanceSlide11
Anti-friction/wear performanceSlide12
(Test condition: [Bmim][PF6], 1500 N, 0.7 m/s, duration: 1 h).AFM studies
PEEK
Before
After
Counterpart Slide13
Elemental distribution (except commom elements in steel) in the counterpart worn surfaces lubricated with (a) [Bmim][PF
6], 1500 N for 1 h, and (b) L-HM46, 800 N for 45 minutes.Tribochemical investigationSlide14
MechanismanalysisSlide15
Tack !