Low density sleeve

Details Low density sleeve Low density sleeve

1974-12-30

1976-06-29

Poer, J.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106 41, 106 67, C04B 2106

Patent

active

039664805

ABSTRACT:
A low density, refractory stopper rod sleeve has a substantially imperforate surface and a core containing a plurality of randomly spaced, internal and discontinuous small voids. The density of the sleeve is less than 2.0 gr./cc and the preferred density range is 1.60 to 1.85 gr./cc. The sleeve is made up of six parts by volume refractory clay mix to four parts of a combustible waste material such as wet sawdust which does not exceed a screen size of 10 mesh. The sleeves are made by the stiff mud process which includes extruding the mix into solid, cylindrical blanks and forming the blanks in a die in which the final sleeve is slidably disengaged from the die. After drying the sleeve is processed through a normal firing cycle until it reaches approximately 1500.degree.F at which time it is held for a prolonged period of time to drive off the carbonaceous material associated with the waste combustible in the mix.

REFERENCES:
patent: 2499229 (1950-02-01), Rankine
patent: 2688558 (1954-09-01), Rankine
patent: 3591393 (1971-07-01), Rankine

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