METHOD OF PRODUCING COMPOSITE CERAMIC ARTICLES Russian patent published in 2014 - IPC C04B35/16 

FIELD: chemistry.

SUBSTANCE: method of producing composite ceramic articles includes preparing a moulding mixture as filler from rock and a binding agent in form of phosphoric acid, holding the obtained mixture, moulding articles from the obtained mixture, followed by heat treatment; preparation of the moulding mixture is carried out by particle size classification, with selection of the following fractions of the filler: -1.0+0.315, -0.315+0.08 and -0.08+0.042, in ratio of 6:3:1 in form of quartz porphyry or granite or liparite in amount of 65-72 wt %, which is mixed with phosphoric acid in amount of 25-30 wt % and glass fibre with the ratio of the length of the fibre to the diameter thereof ranging from 5000 to 6000 in amount of 3-5 wt %, holding at temperature of 20-30°C for 25-40 hours, moulding at pressure of 35-45 MPa and heat treatment at temperature of 350-380°C for 1.5 hours.

EFFECT: high density and chemical stability of articles, low water absorption of sintered ceramic mixtures.

5 tbl