Compositions: ceramic – Ceramic compositions – Refractory
Patent
1985-04-29
1986-03-25
McCarthy, Helen M.
Compositions: ceramic
Ceramic compositions
Refractory
264 61, 264 63, 264 65, 264 66, 501 96, 501152, C04B 3558, F27D 706
Patent
active
045783659
ABSTRACT:
A process for producing an aluminum nitride ceramic body having a composition defined and encompassed by polygon P1N1KJ but not including lines KJ and P1J of FIG. 4, and a thermal conductivity greater than 1.00 W/cm.multidot.K at 25.degree. 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 between points K and P1 of FIG. 4, said compact having an equivalent % composition of Y, Al, O and N outside the composition defined and encompassed by polygon P1N1KJ 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 P1N1KJ but not including lines KJ and P1J of FIG. 4, and sintering said deoxidized compact at a temperature of at least about 1860.degree. C. producing said ceramic body.
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Bobik Carl F.
Huseby Irvin C.
Binkowski Jane M.
Davis Jr. James C.
General Electric Company
Magee Jr. James
McCarthy Helen M.
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