The coated fibrous carbon material is then reimpregnated with a second thermosetting resin containing a boron compound and, optionally, {HEAD ~ a refractory metal} capable of reacting with {TAIL ~ boron} to form a metal boride 
capable of reacting with
The coated fibrous carbon material is then reimpregnated with a second thermosetting resin containing a boron compound and , optionally , { HEAD ~ a refractory metal } capable of reacting with { TAIL ~ boron } to form a metal boride
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH