Tribological properties of Si3N4 compositesatdi.uni-obuda.hu/sites/default/files/13... ·...

Tribological properties of In-Situ Si2N2O-Si3N4 composites

Awais Qadir

Supervisor: Prof. Dr. Ján Dusza, Dr. Pinke Peter

124/06/2020Semester Progress Report Jan - Jun, 2020,

Obuda University

Aim of the work

• To study the tribological behaviour of in-situ

grown Si2N2O in Si3N4 composites.

• Following parameters were studied:

Wear Mechanism

Coefficient of friction


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Materials Preparation

α-Si3N4Powder

Mixing with Y2O3 & Al2O3

Sintering at 1500 ˚C for 3 hours


Mixing with Y2O3 & Al2O3




Sintering at 1500 ˚C for 3 hoursMixing with

Y2O3 & Al2O3

As Reference Material

10 hrs oxidizedα-Si3N4

20 hrs oxidizedα-Si3N424/06/2020 Semester Progress Report Jan - Jun, 2020,

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Samples Details


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Oxidation

Time (h)

α-Si3N4(wt. %)

Y2O3 (wt.

%)

Al2O3(wt. %)

SN-15/0 0 90 6 4

SN-15/10h 10 90 6 4

SN-15/20h 20 90 6 4

SN-17/0 0 90 6 4

SN-17/10h 10 90 6 4

SN-17/20h 20 90 6 4

Un-oxidized

10h oxidized

20h oxidized

10h oxidized

20h oxidized

Un-oxidized

XRD Analysis


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10 20 30 40 50 60 70 80 90

Inte

ns

ity

SN-17/0

SN-17/10h

SN-17/20h

SN-15/20h

SN-15/10h

SN-17/20h

SN-17/10h

SN-17/0

SN-15/20h

SN-15/10h

SN-15/0

Si3N

4

Si3N

4

Si2N

2O

ZrO2

Al2O

3

SN-15/0

Complete to transformation

happened in case of sample

sintered at 1700 C.

Phase Si2N2O appeared in

samples which processed from

the oxidized powders.

The amount of Si2N2O

increasing with the oxidation

time or amount oxides in

starting powders.

Un-oxidized

10h oxidized

20h oxidized

Un-oxidized

10h oxidized

20h oxidized

Sintered @1700 C

Sintered @1500 C

What is Tribology

• Tribology = Greek word “Tribos” Tribos = “Rubbing and Sliding”

• Tribology is a scientific study which deals with friction, lubrication and wear of contacting bodies.

• Tribological knowledge helps to improve service life, safety and reliability of interacting machine components and yields in economic benefits.


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What is Tribology and its importance?


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Source: H. Czichos and M. Woydt: Introduction to Tribology and Tribological Parameters.

ASM handbook, Vol. 18, Friction, Lubrication and Wear Technology, 2017

Impact of Tribological Issues on Global Economy

23%

77%

Energy Consumption

Tribology

Remaining


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Energy Consumption due to Friction and Wear

87%

13% To over comeFriction

Toremanufacturethe worn parts

To re-manufacture

To overcome Friciton

Source: K. Holmberg and A. Erdemir, “Influence of tribology on global

energy consumption, costs and emissions,” Friction, vol. 5, no. 3, pp.

263–284, Sep. 2017.

Tribological Testing of our samples


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Ball-on-disk technique

Counter part = Si3N4 ball (D=5 mm)

Condition = Dry sliding condition

Temperature = Room temperature (25 C)

Humidity = 51%

Normal applied load = 5 N

Sliding speed = 0.05 m/s

Sliding distance = 1000 m.

Different types of testing techniques

Source: Source: https://www.face-kyowa.co.jp/english/en_science/en_what_friction.html

https://www.face-kyowa.co.jp/english/en_science/en_what_friction.html

Coefficient of Friction


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0.79216

0.726820.73936 0.73157

0.75941

0.73298

0.80974

0.76296 0.76836

0.64664

0.72436

0.67079

SN-15/0 SN-15/10h SN-15/20h -- -- SN-17/0 SN-17/10h SN-17/20h

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

Samples sintered at 1700 C

Co

eff

icie

nt

of

Fri

cti

on

(C

OF

):

Samples sintered at 1500 C

0-40 m

40-1000 m

Overall, COF of samples sintered at 1500 C was higher than that of 1700 C

Wear Rate


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1.64699E-4

1.22428E-4

1.86252E-4

2.3954E-4

3.45108E-4

2.68916E-4

SN-15/0 SN-15/10h SN-15/20h -- SN-17/0 SN-17/10h SN-17/20h

0.0

5.0x10-5

1.0x10-4

1.5x10-4

2.0x10-4

2.5x10-4

3.0x10-4

3.5x10-4

T

ota

l W

ea

r R

ate

(W

s):

mm

3N

m

Wear Rate

Samples sintered at 1500C Samples sintered at 1700C

Wear Rate of samples sintered at 1700 C was higher than that of 1500 C

Low wear rate can be

attributes to the present

amount alpha phase,

Alpha phase is harder and

robust than beta phase.

Stages of Wear Rate


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Source: Machinability of Titanium Alloys in Drilling

By Safian Sharif, Erween Abd Rahim and Hiroyuki Sasahara

Submitted: May 17th 2011Reviewed: October 12th 2011Published: March 16th 2012

DOI: 10.5772/35948

Wear rate in Different Stages

13

In first 0-40 m (run-in

stage), the wear rate was

almost time higher than

the overall wear rate.

7.62557E-4

6.39755E-4

8.04367E-4

0.00118

0.00257

0.00164

1.39788E-41.00873E-4

1.60498E-42.00542E-4

2.52321E-42.11934E-4

SN-15/0 SN-15/10h SN-15/20h -- SN-17/0 SN-17/10h SN-17/20h

0.0

5.0x10-4

1.0x10-3

1.5x10-3

2.0x10-3

2.5x10-3

Samples sintered at 1700C

To

tal W

ea

r R

ate

(W

s):

mm

3N

m

0 - 40 m

40 -100 m

Samples sintered at 1500C

For our samples, the first

40 m of sliding is a run-in

stage

Wear rate at every 100 m

Sintered at 1500 C Sintered at 1700 C


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0 200 400 600 800 1000

0.0

2.0x10-4

4.0x10-4

6.0x10-4

8.0x10-4

Sp

ec

ific

We

ar

Ra

te (

Ws):

mm

3N

m

SN-15/0

SN-15/10h

SN-15/20h

ExpDec1 Fit of Sheet1 SN-15/0

ExpDec1 Fit of Sheet1 SN-15/10h


Sliding Distance (m)

Model ExpDec1

Equationy = A1*exp(-x/t1) + y0

Reduced Chi-Sqr9.0751E-10 2.12042E-9 3.87873E-10

Adj. R-Square 0.98319 0.95059 0.99217

Value Standard Error

SN-15/0 y0 6.63039E-5 1.36285E-5

SN-15/0 A1 9.35521E-4 5.2052E-5

SN-15/0 t1 138.20716 14.41579

SN-15/10h y0 5.03463E-5 1.91419E-5

SN-15/10h A1 8.87229E-4 9.43201E-5

SN-15/10h t1 114.28241 20.73485

SN-15/20h y0 1.1443E-4 7.79872E-6

SN-15/20h A1 0.00104 4.6521E-5

SN-15/20h t1 99.10054 7.08659

0 200 400 600 800 1000

0.0

5.0x10-4

1.0x10-3

1.5x10-3

2.0x10-3

2.5x10-3

3.0x10-3

Sp

ec

ific

We

ar

Ra

te (

Ws):

mm

3N

m

SN-17/0

SN-17/10h

SN-17/20h

ExpDec1 Fit of Sheet1 SN-17/0



Sliding Distance (m)

Model ExpDec1

Equationy = A1*exp(-x/t1) + y0

Reduced Chi-Sqr

2.30501E-9 9.32831E-9 3.04964E-9

Adj. R-Square 0.97795 0.9812 0.98455

Value Standard Error

SN-17/0 y0 1.41221E-4 1.85034E-5

SN-17/0 A1 0.00157 1.25797E-4

SN-17/0 t1 90.04197 10.94038

SN-17/10h y0 2.50603E-4 3.22002E-5

SN-17/10h A1 0.04485 0.11092

SN-17/10h t1 13.51229 11.30244

SN-17/20h y0 1.7767E-4 1.91966E-5

SN-17/20h A1 0.00328 3.39082E-4

SN-17/20h t1 49.09084 5.40979

Run-in

0-40 m

Steady State

40-1000 mRun-in

0-40 m

Steady State

40-1000 m

Wear Mechanism


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SEM Image of wear track

Conclusion

• Oxidizing the starting powders of Si3N4 is successful in order to grow in-situ Si2N2O in sintered Si3N4.

• The wear rate in run-in stage is much higher than that of steady-state stage. 1000 m sliding distance is still a steady state, no catastrophic failure was observed.

• The COF is higher for the composites sintered at 1500 C and lower wear rates due to the presence of higher amount of - Si3N4 in the composite.


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Publication 2017 - 2020

1. A. Qadir, Z. Fogarassy, Z. E. Horváth, K. Balazsi, and C. Balazsi, “Effect of the oxidization of Si3N4 powder on the microstructural and mechanical properties of hot isostatic pressed silicon nitride,” Ceramics International, vol. 44, no. 12, pp. 14601–14609, Aug. 2018. (Impact Factor 2.986). https://doi.org/10.1016/j.ceramint.2018.05.081

2. Awais, Q., Balazsi, K., Balazsi, C., Ivor, M. and Dusza, J., 2020. Properties of MWCNTs addedSi3N4 composites processed from oxidized silicon nitride powders. Processing and Application of Ceramics, 14(1), pp.25-31.(Impact Factor: 1.085).https://doi.org/10.2298/PAC2001025Q

3. Qadir, A.; Pinke, P.; Dusza, J. Silicon Nitride-Based Composites with the Addition of CNTs—A Review of Recent Progress, Challenges, and Future Prospects. Materials 2020, 13, 2799. (Impact Factor 2.972)https://doi.org/10.3390/ma13122799

4. Awais, Qadir ; Jan, Dusza ; Pinke, Péter, Tribological Behavior of Silicon Nitride and Carbon Based Filler Composites – a Review, In: Horváth, Richárd; Beke, Éva; Stadler, Róbert Gábor(eds.) Mérnöki Szimpózium a Bánkin előadásai : Proceedings of the Engineering Symposium at Bánki (ESB 2019), Budapest, Hungary : Obuda University, (2019) pp. 7-16. , 10 p

5. Tribological properties of in-situ grown Si2N2O-Si3N4 composites, (In Progress)


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https://doi.org/10.1016/j.ceramint.2018.05.081https://doi.org/10.2298/PAC2001025Qhttps://doi.org/10.3390/ma13122799

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