26 Mar 12 17:04
Thank you for your responses and questions:
1) we do not have a material analysis. This is the leading edge of the investigation. We will send a magnet out for a Chemical Analysis.
2) we do not receive Chem Analysis with BH shipments. Only BH curves. The BH curve that came with the shipment shows something similiar to what we normally receive. I cannot judge the curve, but the listed characteristics are much higher than what we had measured. I am guessing that the C of C information and QC data that was sent to us is "boiler plate" or from some lot of material made around the same time.
3) I did not check the density and that is a great idea. I will do so. What I can say is that the material seems to be sintered. Sintered what, I do not know. It is NOT alnico.
4) No special blend. Grade 35SH. I believe that the vendor is licensed, however we are always told form Chinese vendors that the material is licensed or too old to need to be lincensed.
Let us say that the material is actaully sintered NdfeB. What could go wrong in the mfg process to result in this magnet failure? I have been doing some reading online and it seems to point to the chemistry. I was hoping that this was not normal, but that someone could say: not orienetd, not enough ND and too much FE, Sintered wrong. We are trying to go back to the vendor with a bit of knowledge instead of relying on an answer from them.
Thank you for all of the help,