Silicon nitride powder and its manufacturing

Details Silicon nitride powder and its manufacturing Silicon nitride powder and its manufacturing

1995-03-13

1996-07-23

Group, Karl

Compositions: ceramic

Ceramic compositions

Refractory

423344, C04B 35584

Patent

active

055389279

ABSTRACT:
A silicon nitride powder with which a highly reliable silicon nitride with high strength and small strength and dimensional variances is obtainable is disclosed. By setting the amount of their surface acidic groups per B.E.T. surface area to not less than 0.2 .mu.eq/m.sup.2, their dispersibility in a mixing solvent is drastically improved. By using them, moldings with high density and homogeneity can be obtained, thereby enabling in turn a highly reliable sintered product of silicon nitride with high strength and small strength and dimensional variances to be easily manufactured. Besides, in the silicon nitride powder, the proportion of the silicon [Si*] belonging to SiO.sub.2, of the surface silicon [Si], which is determined by the X-ray photoelectron spectroscopy (XPS), should be not less than 0.07 in its atomic ratio [Si*/Si] and that to silicon of the surface carbon [C] which is determined by XPS in the same way should be not more than 0.20 in its atomic ratio [C/Si].

REFERENCES:
patent: 4983371 (1991-01-01), Pitzer et al.
patent: 5030434 (1991-07-01), Pitzer et al.
patent: 5066473 (1991-11-01), Pitzer et al.
patent: 5081079 (1992-01-01), Ukyo et al.
patent: 5258169 (1993-11-01), Wannagat et al.

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