High density, sintered silicon nitride containing articles and m

Details High density, sintered silicon nitride containing articles and m High density, sintered silicon nitride containing articles and m

1984-10-22

1986-07-15

Bell, Mark L.

Metallurgical apparatus

Linings

With specific lining enclosing structure

106 389, 266280, 501 97, C04B 3558, C21D 100, B28B 700, B28B 734

Patent

active

046001824

ABSTRACT:
Articles and method for containing molten nickel and methods for making the former. The material used is a high density silicon nitride that is very resistant to the corrosive properties of molten nickel alloys. The composition needed to produce such a containing article comprises polycrystalline silicon nitride containing (by weight) about 0.6% to about 8% alumina, about 15% yttria and about 2% to about 5% silica or amorphous silicon nitride containing about 2% to about 6% alumina, and about 15% yttria and about 2% to about 5% silica. The articles are formed by cold pressing and sintering methods. These articles are particularly useful in processes for molding and (RSR.TM.) spinning molten nickel alloys.

REFERENCES:
patent: 3969125 (1976-07-01), Komega et al.
patent: 4119475 (1978-10-01), Prochazka et al.
Greskovich, C., et al; "Basic Research on Technology Development for Sintered Ceramics", Nov. 1976, General Electric Co. Technical Report, AFML-TR-76-179.
Priest, H. et al.; "Sintering of Si.sub.3 N.sub.4 Under High Nitrogen Pressure", JACS, Jan.-Feb. 1977, p. 81.
Rowcliffe, D. et al.; "Sintering of Silicon Nitride", Stanford Research Institute, Menlo Park, California, pp. 191-196.
Layden et al.; "Development of SiAlON Materials", United Technologies Research Center, Mar. 15, 1978, No. B78-912997-27.
Brennan, J. J.; "Investigate Fiber Reinforced Si.sub.3 N.sub.4 ", United Technologies Research Center, Mar. 31, 1976, No. R76-912081-4.

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