Adhesive bonding and miscellaneous chemical manufacture – Delaminating processes adapted for specified product – Delaminating in preparation for post processing recycling step
Patent
1981-01-30
1983-05-10
Bernstein, Hiram H.
Adhesive bonding and miscellaneous chemical manufacture
Delaminating processes adapted for specified product
Delaminating in preparation for post processing recycling step
C30B 710
Patent
active
043828400
ABSTRACT:
Large single crystals of berlinite are grown onto seed crystals by maintaining the crystals at a fixed elevated temperatutre in a pressure vessel containing a nutrient of coarse berlinite crystalline powder, held at a fixed lower temperature, and concentrated phosphoric acid. Because berlinite shows retrograde solubility, the nutrient goes into solution, and berlinite deposits on the higher-temperature growing crystal. The vessel is rocked to promote motion of saturated solution to the crystal and depleted solution to the nutrient. Large single crystals of alpha-gallium orthophoshate may be grown using the same apparatus and a similar process. The resultant crystals may be cut into wafers useful in surface acoustic wave devices.
REFERENCES:
patent: 2675303 (1954-04-01), Sobek et al.
patent: 3271114 (1966-09-01), Kolb
patent: 4247358 (1981-01-01), Au Coin et al.
patent: 4300979 (1981-11-01), Kolb et al.
patent: 4324773 (1981-04-01), Chai et al.
Drafall et al., "The Growth of Berlinite Single Crystals", from Litton Systems and Rome Air Development Center, 3/1980.
Kolb et al., "Hydrothermal Synthesis of AlPO.sub.4," from 31st Annual Frequency Control Symp., Jul. 1977, Bell Laboratories.
Buehler Ernest
Chai Bruce H.
Flynn John J.
Allied Corporation
Bernstein Hiram H.
Fuchs Gerhard H,.
Riesenfeld James
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