PROCEDURE FOR FABRICATION OF COMPOSITE CERAMIC ITEMS Russian patent published in 2015 - IPC C04B35/117 C04B35/81 C04B35/626 

FIELD: metallurgy.

SUBSTANCE: under procedure for fabrication of composite items including preparation of the initial charge containing mixture of powder of aluminium oxide, threadlike crystals of silicone carbide and paraffin in the following ratio, wt %: aluminium oxide 55-65, threadlike crystals of silicone carbide 25-35, paraffin 8-12, formation by extrusion of the flat blank with orientation in it of the threadlike reinforcing crystals in the direction of extrusion, stripping of the binding substance, and item pressing, flat blank is cut to n≥2 elements as per item shape with different orientation of the threadlike reinforcing crystals, that layer by layer are assembled in the briquette such that in the adjacent layers orientation of the threadlike reinforcing crystals is different. Stripping of the binding substance is performed by heating in the furnace to 100°C with rate not exceeding 5 degrees/min, and hot pressing of the item is performed at temperature 1500-1700°C and pressure 500-600 MPa.

EFFECT: increased crack resistance.

1 dwg, 1 ex