Vitrified composite washita stone and process for producing same

Details Vitrified composite washita stone and process for producing same Vitrified composite washita stone and process for producing same

1987-04-30

1988-04-12

Lieberman, Paul

Abrasive tool making process, material, or composition

Miscellaneous

51308, 51309, 106 85, B24D 300

Patent

active

047365480

ABSTRACT:
A process for artificially producing a relatively high density, tinted novaculite Washita stone of relatively homogenous characteristics, and the artificial stone product thereby produced. Tinted and untinted layers of abrasive mix are combined in a lateral pressing step to provide a composite colored stone suitable for subsequent vitrification. The untinted mixture preferably is preferably made from 100 mesh novaculite powder, but alternatively a blend of approximately 100 mesh and 200 mesh novaculite powder is employed. The is mixed with a wetting agent and water, a temporary binder, a flux, and a high refractory frit, yielding the following approximate constituency by weight: approximately 64% of said 100 and 200 mesh novaculite; 5-6% of a temporary binder, approximately 3% of the wetting agent, approximately 2% flux, and approximately 23-25% frit. After screening, the first mixture is completed by blending with ball clay. The tinted mixture is formulated from a supply of the untinted mix and a color glaze which is blended in. Layers of tinted mix are alternated with layers of untinted mix, and the final mixture may be edgewise pressed in the shape of the desired end product at pressures not exceeding three to five tons per square inch. Vitrification is thereafter achieved by firing the pressed parts in an electric furnace up gentle ramps to slowly approach cone 04, and a soak time of approximately 2 hours is preferred.

REFERENCES:
patent: 1983082 (1934-12-01), Howe et al.
patent: 2880081 (1959-03-01), Eubank
patent: 3003860 (1961-10-01), Sermon et al.
patent: 3092476 (1963-06-01), Vatabe
patent: 3142138 (1964-07-01), Kean et al.
patent: 4541843 (1985-09-01), Elbel et al.

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