In one embodiment, carbon is added to help remove {TAIL ~ surface silica} from {HEAD ~ the starting powder} to promote sintering 
In one embodiment , carbon is added to help remove { TAIL ~ surface silica } from { HEAD ~ the starting powder } to promote sintering
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH