C - Chemistry – Metallurgy – 30 – B
Patent
C - Chemistry, Metallurgy
30
B
C30B 1/02 (2006.01) C30B 29/66 (2006.01)
Patent
CA 2132185
A solid state process for the bulk conversion of a dense polycrystalline ceramic body to a single crystal body has been accomplished by heating the polycrystalline material to a temperature above one-half of the melting temperature of the material but below the melting point of the material. As the process is a solid state process, no melting of the ceramic body is necessary to convert it to a single crystal. The process has been used to convert a dense polycrystalline alumina body (PCA) containing less than 100 wppm of magnesia to sapphire (single crystal alumina) by heating the PCA to temperatures above 1100°C but below 2050°C, the melting point of alumina.
Kaliszewski Mary Sue
Levinson Lionel M.
Maxwell Randolph E.
Scott Curtis E.
Company General Electric
Monsanto Company
Wilson Craig
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