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Ceramic-Al-sub-2-O-sub-3-substoichiometric-TiC-body

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Ceramic Al.sub.2 O.sub.3 substoichiometric TiC body

Details

Inventors: Lee, Minyoung; Szala, Lawrence E.;
Assignee: General Electric Company (Schenectady, NY)
Primary Examiner: Bell; Mark
Assistant Examiner:
Attorney, Agent or Firm: Binkowski; Jane M., Davis, Jr.; James C., Magee, Jr.; James

A particulate dispersion of Al.sub.2 O.sub.3, elemental non-diamond carbon and a titanium member selected from the group consisting of elemental titanium, TiH.sub.2 and mixtures thereof is formed into a compact and sintered producing a ceramic composite having a minimum Rockwell A hardness of about 92 and being comprised of an Al.sub.2 O.sub.3 phase and a substoichiometric titanium carbide phase.

DETAILED DESCRIPTION What is claimed is: 1.
A polycrystalline body consisting essentially of a significantly uniform intermixture of an Al.
sub.
2 O.
sub.
3 phase and a substoichiometric Ti.
sub.
1 C.
sub.
x phase where x ranges from about 0.
65 to about 0.
95, said Ti.
sub.
1 C.
sub.
x phase ranging from about 20% by weight to about 40% by weight of said body, and said Al.
sub.
2 O.
sub.
3 phase ranging from about 80% by weight to about 60% by weight of said body, said body having a minimum Rockwell A hardness of about 92, said Al.
sub.
2 O.
sub.
3 phase being a continuous interconnecting network.
2.
A polycrystalline body consisting essentially of a significantly uniform intermixture of an Al.
sub.
2 O.
sub.
3 phase and a substoichiometric Ti.
sub.
1 C.
sub.
x phase where x ranges from about 0.
65 to about 0.
95, said Ti.
sub.
1 C.
sub.
x phase ranging from about 20% by weight to less than about 30% by weight of said body, said body having a minimum Rockwell A hardness of about 92, said Al.
sub.
2 O.
sub.
3 phase being a continuous interconnecting network and said Ti.
sub.
1 C.
sub.
x phase being discontinuous.
3.
A polycrystalline body consisting essentially of a significantly uniform intermixture of an Al.
sub.
2 O.
sub.
3 phase and a substoichiometric Ti.
sub.
1 C.
sub.
x phase where x ranges from about 0.
65 to about 0.
95, said Ti.
sub.
1 C.
sub.
x phase ranging from higher than about 30% by weight to about 40% by weight of said body and being present at least in an amount of sufficient to make said body electrically conducting, said body having a minimum Rockwell A hardness of about 92, said Al.
sub.
2 O.
sub.
3 phase being a continuous interconnecting network.
4.
The polycrystalline body of claim 1 wherein said Al.
sub.
2 O.
sub.
3 phase has an average grain size ranging from about 1 micron to about 15 microns and said Ti.
sub.
1 C.
sub.
x phase has a average grain size ranging from about 0.
1 micron to about 10 microns.
5.
A cutting medium consisting essentially of a polycrystalline body consisting essentially of significantly uniform intermixed phases of Al

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