Please clarify, what kind of bearing do you need? What is the technical purpose of the bearing?
In general, nitriding depth, surface hardness and composition of the compound layer at the surface are important chararacteristics. These characteristics might be tested by applying metallographical methods, hardness measurement and SEM at the cross section. Also XRD measurements at the surface might be useful.
Cages samples have surface hardness 300-370 HV0,3 and 9-13 µm nitride layer. I tested corrosion resistance conventional cage and nitrided cage, both of them rusted. I tested bearings which are made of nitrided cage and conventional cage (test conditions : 10.000 rpm, no loads, 1 hour) but no difference between friction and heat. (1 hour because the graphic is constant from 40 min.) I wonder what is the effect of nitrided cage to the bearings application?
You nitrided cages and created diffusion layers with a thickness of 9-13 microns. What is the practical application of the nitrited cage? What conditions does the cage have to withstand in practical use? The testing methods always depend on the real operating conditions.
It sounds like no compound layer developed at the surface, so there is no continuous layer of iron-nitride phases. I guess a continuous nitride layer would provide a better corrosion resistance.
The nitriding depth is very low. Usually, nitriding depths of several 100 microns are used as wear protection. Maybe, this the reason for the unchanged tribological behaviour.
I expect reduction of the friction, improve heat resistance than conventional cage. Practical use is high speed conditions.
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