METHOD OF OBTAINING TECHNOLOGICAL TRAININGS OF CERAMIC ARTICLES FROM SILICON NITRIDE Russian patent published in 2018 - IPC C04B35/591 

FIELD: metallurgy.

SUBSTANCE: method involves preparing the charge by mixing in a disk mill silicon nitride with additions of yttrium oxide and aluminium oxide at a ratio of 3:5 oxides. The total amount of yttrium oxide and aluminium oxide is 15 wt % of the total amount of the charge. The obtained batch is subjected to cold isostatic pressing at a pressure of 200 MPa in silicone elastic moulds with an exposure time of 90 s. Sintering of the preform is carried out in a nitrogen atmosphere at a heating rate of 525°C/h and further exposure for 1 hour at a sintering temperature of 1650°C.

EFFECT: method allows you to obtain blanks of complex shape and large size, it is possible to achieve the planned indicators.

3 dwg, 1 ex