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