In this paper, the modified weight loss approach was utilized, that is, by taking carbon-containing alumina balls
as a reference, to indirectly measure the separation ratio of volatile matters and water and to evaluate the degree of reduction with Equation (1), which originated from a reference and was modified in this work.
Two different counterparts were used: 3 mm sized Cr-steel balls with 1.6% Cr (100Cr6) with hardness of 700 HV (6.86 GPa) and 3 mm sized alumina balls
with hardness of 1700 HV (16.7 GPa).
The most negative effect of basalt on the wear resistance of coatings takes place under the lowest load using alumina balls
. Soft steel balls were not able to cause significant wear and even some transfer of steel to the coatings and its intensive oxidation was found (Fig.
The fatigue behaviour of the identical alumina balls
was studied under dynamic fatigue loading by using an Instron made 'Hip Joint Simulator' (model no.
* The furnace filter bed, consisting of various mesh sizes of tabular alumina balls
and chips, allows proper metal filtration and optional degassing.
After that, all the batches were mixed in a mortar for around 5-10 minutes followed by ball milling for 3 hrs in a plastic container homogenously mixed at a ratio of weight 3: 1, which is 3 parts alumina balls
to one part weight of powder.
Active aggregates, on the other hand, refer to grains of fluxes or alumina balls
coated in fluxes.