Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By mechanically introducing gas into material
Patent
1975-11-14
1976-11-09
McCarthy, Helen M.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By mechanically introducing gas into material
106 62, 106 65, 106 734, 106 735, 264 65, 423327, C04B 3332, C04B 3558
Patent
active
039911489
ABSTRACT:
In a method of forming a refractory product wherein a mixture consisting of effective amounts of silica, alumina, aluminium nitride, and with or without silicon nitride, is provided, the mixture is surrounded with a protective medium and sintered at a temperature between 1200.degree.-2000.degree. C to form a single phase silicon aluminium oxynitride corresponding to the formula: Si.sub.6.sub.-z Al.sub.z N.sub.8.sub.-z O.sub.z, where z is greater than zero and less than or equal to 5, and when there is no silicon nitride in the mixture z is greater than or equal to 4 and less than or equal to 5, the improvement being the step of introducing into said mixture magnesium oxide in an amount of not more than 5% by weight to form a magnesium silicate glass and aid in densification of the ceramic material.
REFERENCES:
patent: 3903230 (1975-09-01), Kamigaito et al.
Jack K. H. et al., "Ceramics Based on the Si--Al--O--N and Related Systems," Nature, Phys. Science 238, July 10, 1972, pp. 28-29.
Oyama; Y., "Solid Solution in the Ternary System, Si.sub.3 N.sub.4 --AlN--Al.sub.2 O.sub.3," Japan, J. Appl. Phys. 11, No. 5 (1972), pp. 760-761.
Masak H. et al., "Low Temperature Synthesis of Silicon Nitride Solid Solution," Japan, J. Appl. Phys. 14, No. 2, pp. 301-302 (Feb. 1975).
Horsley Richard Frederick
Lumby Roland John
Wills Roger Rostron
Joseph Lucas (Industries) Limited
McCarthy Helen M.
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