METHOD OF MAKING ARTICLES FROM REFRACTORY CERAMIC MATERIAL FOR MICROWAVE ELECTRONIC EQUIPMENT Russian patent published in 2013 - IPC C04B35/106 C04B41/87 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of making articles from refractory ceramic material for use in microwave electronic equipment: furnace muffler, trays and components thereof. The surface of aluminium oxide particles is moistened with a surfactant, the aluminium oxide particles are mixed with kaolin in ratio of 3:1 (by weight) to obtain a homogeneous mixture of given composition, workpieces of the articles are formed by cold moulding, dried at normal temperature and fired in an oxidative medium as follows: raising temperature to 1650±20°C at a rate of 50±5°C/h, isothermic aging at that temperature for 3.0±0.5 hours and cooling to normal temperature at the same rate. Zirconium hydroxide sol with density of 1100-1180 kg/m³ and thickness of 1-3 mcm is applied onto the fired workpieces, completely dried at normal temperature and fired in an oxidative medium as follows: raising temperature to 1650±20°C at a rate of 100±5°C/h, isothermic aging at that temperature for 3.0±0.5 hours and cooling to normal temperature at the same rate.

EFFECT: high thermomechanical strength and, consequently, longer life of articles made from refractory ceramic material when used in microwave electronic equipment and ensuring stability of electrical properties thereof.

4 cl, 11 ex, 1 tbl