ftfy. Foreign material contamination is definitely a thing, but in a clean room the wear particles are the culprit. I think the blackness of it is due to mixing aluminium oxide with transition metals, mostly iron but also Ni Cr V Mo Mn etc. which are present as alloying elements in the steel parts.
ftfy. Foreign material contamination is definitely a thing, but in a clean room the wear particles are the culprit. I think the blackness of it is due to mixing aluminium oxide with transition metals, mostly iron but also Ni Cr V Mo Mn etc. which are present as alloying elements in the steel parts.