Yes. Full ceramic bearings have load ratings 25 to 35 per cent lower than steel bearings. As the material is much harder, it is also more brittle. Therefore, when put under too much pressure, ceramic material may crack while steel is more likely to suffer indentations.
Before deciding to use full ceramic bearings, it is important to assess whether the bearing can handle the planned load. You should also consider the presence of any sudden, heavy impact loads which full ceramic bearings do not tolerate as well as steel bearings. For impact loads, a steel or stainless steel bearing would be a better option.
If you are unsure which bearing material is right for you, check out of these common bearing FAQs. Here, you will find bearing material comparisons, such as stainless steel bearings vs ceramic bearings. This should help you select the right material.
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