| 摘要 |
A process for producing an aluminum nitride ceramic body having a composition defined and encompassed by polygon JKLM but not including line MJ of FIG. 4 and a thermal conductivity greater than 1.00 W/cmxK at 25 DEG C., preferably greater than 1.42 W/cmxK at 25 DEG C., which comprises forming a mixture comprised of aluminum nitride powder containing oxygen, yttrium oxide, and free carbon, shaping said mixture into a compact, said mixture and said compact having a composition wherein the equivalent % of yttrium and aluminum ranges from point L to less than joint J of FIG. 4, said compact having an equivalent % composition of Y, Al, O and N outside the composition defined and encompassed by polygon JKLM of FIG. 4, heating said compact up to a temperature at which its pores remain open reacting said free carbon with oxygen contained in said aluminum nitride producing a deoxidized compact, said deoxidized compact having a composition wherein the equivalent % of Al, Y, O and N is defined and encompassed by polygon JKLM but not including line MJ of FIG. 4, and sintering said deoxidized compact at a temperature of at least about 1860 DEG C. producing said ceramic body. |
