Stock material or miscellaneous articles – Composite – Of inorganic material
Reexamination Certificate
2011-06-21
2011-06-21
Speer, Timothy M (Department: 1784)
Stock material or miscellaneous articles
Composite
Of inorganic material
C428S446000, C428S448000, C428S447000, C428S451000, C428S452000, C501S097100, C501S097200, C501S097300
Reexamination Certificate
active
07964296
ABSTRACT:
High-volume, fully dense, multi-component monoliths with microstructurally indistinguishable joints that can be used as refractory, corrosion and wear resistant components in the non-ferrous metal industry. The Si3N4monoliths according to the invention comprise at least 90% by weight β-type Si3N4and up to 10% by weight of a predominantly amorphous binder phase, said binder phase being formed from compositions of the rare earth metal —Al—Si—O—N, rare earth metal —Mg—Si—O—N or Mg—Si—O—N systems. Preferably the rare earth metal is yttrium (Y). The monoliths have a volume of greater than 250 cm3. A method of making the multi-component monoliths is achieved by simultaneously joining and uniaxially hot pressing an assembly of reaction bonded silicon nitride bodies (RBSN bodies). RBSN bodies are placed in contact with each other in the substantial absence of any interlayer or ceramic paste in between.
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Ceradyne, Inc.
Katz Vera
Speer Timothy M
Tachner Leonard
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