Ball-on-disc measurements of the transient behaviour of the adhesion coefficient of water based suspensions

This data set contains measurements of the transient behaviour of the adhesion coefficient of water based suspensions.
Measurements were conducted on a Mini Traction Machine (MTM), a ball-on-disc test
In the MTM, a rotating ball is rolling on a rotating disc with a defined creepage. 
Both ball and disc are made of bearing steel, which has the advantages of high wear resistance 
and thus not changing contact geometry and surface roughness. 
The ball is vertically loaded, and the suspension is applied to the running contact by micropipette 
after the dry run-in and the evolution of the adhesion coefficient is recorded. 
The vertical load in these experiments was 16 N, corresponding to an average Hertzian stress of 510 MPa, 
the rolling speeds were 300, 50, 20 mm/s and the Slide-to-Roll Ratio was 0.05. 

Particles of different materials were mixed with water to obtain the tested suspension:
talc, iron, black iron oxides and glass spheres.

The measurement data was published in the following Open Access journal paper, 
where a more detailed description of the experiments conducted can be found:

B. Suhr, M.-S. Salehi, S. Skurka, D. Kvarda, R. Galas, M. Omasta, K. Six
Low Adhesion Due to the Wet-Rail Phenomenon: Influence of Particle–Fluid Interaction in Wheel–Rail Contact
Lubricants
2026, 14(6), 214;
https://doi.org/10.3390/lubricants14060214

The files contained in this data set are listed below.
File names are composed of: 
tested particle material, particle size, weight percent of particles in the suspension, initial suspension volume, speed of rotating disk in mm/s

MTM_BlackIronOxide_50-10nm_10wtP_20mul_300mm_s.csv
MTM_BlackIronOxide_5nm_10wtP_20mul_300mm_s.csv
MTM_Fe_10mum_10wtP_20mul_300mm_s.csv
MTM_Fe_40mum_10wtP_20mul_300mm_s.csv
MTM_Fe_60mum_10wtP_20mul_300mm_s.csv
MTM_glass_9mum_10wtP_20mul_300mm_s.csv
MTM_talc_5mum_10wtP_20mul_300mm_s.csv
MTM_talc_5mum_10wtP_50mul_20mm_s.csv
MTM_talc_5mum_10wtP_50mul_50mm_s.csv

In each file the first column contains the time (s), and the second column contains the measured adhesion coefficient.