Compositions: ceramic – Ceramic compositions – Refractory
Patent
1993-12-08
1995-04-04
Bell, Mark L.
Compositions: ceramic
Ceramic compositions
Refractory
501127, 501153, 501154, 501105, 525504, C04B 3554
Patent
active
054037913
ABSTRACT:
Disclosed is a phenol-formaldehyde resin binder for refractories, having from 0.05 to 0.6 methylol group on average per one phenolic constitutive unit and having a free phenol content of less than 5%. For producing refractory granules with the binder, a composition comprising carbon substances of 50% by weight or less in all and a balance of refractory substances is kneaded with the binder and water optionally along with a solvent having a boiling point of 200.degree. C. or higher, in a mixer as heated at 60.degree. to 130.degree. C. Optionally, the volatile content in the blended mix is adjusted to the shapable level. The process of using the binder is free from injury to human bodies and the danger of firing. The refractory granules may be shaped into refractory articles having a suitable gas-permeability stable against variation of the working environment. The refractory granules are suitable for shaping gas-blowing immersion nozzles having a suitable gas-permeability.
REFERENCES:
patent: 4939188 (1990-07-01), Gerber
patent: 4994505 (1991-02-01), Gerber
patent: 5248707 (1993-09-01), Gerber
patent: 5262495 (1993-11-01), Gerber
patent: 5281644 (1994-01-01), Iyer et al.
Bell Mark L.
Krosaki Corporation
Wright A.
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