Boron and carbon may be used as {HEAD ~ traditional sintering aids}, with {TAIL ~ nitrogen} to suppress grain growth, and additions of yttrium and lanthanide elements to promote intergranular fracture 
with
Boron and carbon may be used as { HEAD ~ traditional sintering aids } , with { TAIL ~ nitrogen } to suppress grain growth , and additions of yttrium and lanthanide elements to promote intergranular fracture
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH