Plastic and nonmetallic article shaping or treating: processes – Including step of generating heat by friction
Patent
1986-03-28
1988-08-16
Bell, Mark L.
Plastic and nonmetallic article shaping or treating: processes
Including step of generating heat by friction
501 96, 501 98, 267 66, C04B 3558, F27D 706
Patent
active
047643218
ABSTRACT:
A process for producing an aluminum nitride ceramic body having a composition defined and encompassed by polygon ABCDEFGH excluding line DE of FIG. 2, a porosity of less than about 10% by volume, and a thermal conductivity greater than 0.70 W/cm.multidot.K at 25.degree. C. which comprises forming a mixture comprised of aluminum nitride powder containing oxygen, an Ln oxide selected from the group consisting essentially of erbium oxide, holmium oxide, a mixture and solid solution thereof, and free carbon, shaping said mixture into a compact, said mixture and compact having a composition wherein the equivalent % of Ln and aluminum ranges from point A up to point E of FIG. 2, said mixture and said compact having an equivalent % composition of Ln, Al, O and N outside the composition defined and encompassed by polygon ABCDEFGH of FIG. 2, 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, Ln, O and N is defined and encompassed by polygon ABCDEFGH excluding line DE of FIG. 2, and sintering said deoxidized compact producing said ceramic body.
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Bobik Carl F.
Huseby Irvin C.
Bell Mark L.
Binkowski Jane M.
Davis Jr. James C.
General Electric Company
Knab Ann M.
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