C - Chemistry – Metallurgy – 30 – B
Patent
C - Chemistry, Metallurgy
30
B
C30B 1/10 (2006.01) C30B 1/00 (2006.01) C30B 29/20 (2006.01) C30B 29/66 (2006.01) C30B 31/02 (2006.01) H01J 61/30 (2006.01)
Patent
CA 2141131
A solid state method of converting a polycrystalline ceramic body to a single crystal body includes the steps of doping the polycrystalline ceramic material with a conversion-enhancing dopant and then heating the polycrystalline body at a selected temperature for a selected time sufficient to convert the polycrystalline body to a single crystal. The selected temperature is less than the melting temperature of the polycrystalline material and greater than about one-half the melting temperature of the material. In the conversion of polycrystalline alumina to single crystal alumina (sapphire), examples of conversion-enhancing dopants include cations having a +3 valence, such as chromium, gallium, and titanium. The polycrystalline body further can be inhomogeneously doped to form a first portion of the polycrystalline body that is doped to the selected level of the conversion-enhancing dopant and a second portion that is not doped such that heating the doped polycrystalline body causes conversion of first portion to a single crystal structure and the second portion retains a polycrystalline structure.
Kaliszewski Mary Sue
Levinson Lionel Monty
Scott Curtis Edward
Company General Electric
Craig Wilson And Company
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