{HEAD ~ This aluminum nitride sintered body} has an average grain size of aluminum nitride grains of 2 μm or less, {TAIL ~ a thermal conductivity} of 80 W/m.K or more, and a relative density of 98% or more 
has
{ HEAD ~ This aluminum nitride sintered body } has an average grain size of aluminum nitride grains of 2 μm or less , { TAIL ~ a thermal conductivity } of 80 W / m. K or more , and a relative density of 98 % or more
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH