What is abrasive wear & how it is measured
Abrasive wear is often classified into two-body and three-body; we use both techniques in testing to analyse materials and coatings. Two-body involves particles embedded in one surface ploughing into the other while three-body involves freely rolling particles removing material from one surface throughout the process.
We assess abrasive wear with a TE66 micro-scale abrasion test rig. The material to be tested is loaded against a rotating ball in presence of an abrasive slurry. This is a reliable method with a high level of test control and repeatability.
we can determine the best abrasive wear resistant material or coating for your specific environment.
The micro abrasion test method
The micro abrasion test method we use, which complies with the British Standard: BS EN ISO 26424: 2016, has many uses. We can measure the wear coefficient of monolithic materials, hard and soft coatings and accurately determine multi-coating thickness.
Typical Test Conditions
- Speed: 1 – 150 rpm
- Load: 0.01 – 1 N
- Ball Type: Hardened steel or ceramic
- Slurry Concentration: 80 g/cm3
- Particulates: SiC and Alumina
A schematic of the micro abrasion apparatus shows the slurry becoming in contact with sample after it has been drip fed on to a rotating steel ball which has a 25 mm diameter. However, other ball materials such as ceramic, or polymer can be used.
2-5 Micron Spherical Glass Beads
There is a range of media that we can use for the slurry, such as glass beads.
4-5 Micron Silicon Carbide
or silicon carbide.
The wear can depend on the type of slurry used. Monosized particles will provide reproducible wear patterns, whereas in multisized slurry the wear will depend on the biggest particle whereas the smaller particles can become embedded in the grooves created by the larger particles.
Surface profilometry of a typical abrasive wear scar for a CoCrMo material.
Surface profilometry of a typical abrasive wear scar showing 3-Body wear mechanism after the spherical form is removed.