Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Of inorganic materials
Patent
1983-09-29
1986-04-01
Anderson, Philip
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Of inorganic materials
264 49, 264 62, 264 82, 264133, 264332, 264DIG19, 501154, C01B 2106
Patent
active
045796998
ABSTRACT:
A method for producing .alpha.-silicon nitride whiskers. Silicon is blended with amorphous silicon nitride and a pore-forming composition particles able to be removed without leaving a residue, such as naphthalene particles. The mixture is compacted to a desired shape, after which the pore-forming particles are removed from the mixture to form a porous silicon precursor compact having the desired shape. The silicon precursor is reacted with a substance that releases free nitrogen, such as nitrogen or dry ammonia. The reaction is carried out at a temperature sufficiently high to form an identically shaped porous compact of .alpha.-silicon nitride whiskers but sufficiently low to avoid subliming substantially all of the formed whiskers. Preferably, the reaction is carried out in a range between about 1100.degree. C. and 1500.degree. C. The shaped porous compact of .alpha.-silicon nitride whiskers may be impregnated with a resin binder, a liquid metal, a colloidal suspension, an ionic solution or a gaseous material to form a composite. Alternatively, the compact of .alpha.-silicon nitride whiskers formed by the method described above may be broken down by crushing or grinding to form individual whiskers.
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Anderson Philip
The Boeing Company
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