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