SINTERING METHOD OF RADAR ABSORBENT MAGNESIUM ZINC FERRITES Russian patent published in 2015 - IPC B22F3/12 H01F1/10 H01F1/34 

FIELD: metallurgy.

SUBSTANCE: ferrite-forming oxides of magnesium, zinc and iron are mixed, and ferritic powder is synthesised in furnaces in air medium. Then it is crushed, polyvinyl alcohol is introduced as bonding agent and crushed mixture is granulated. Workpieces in the form of plates are formed by pressing from granulated ferritic powder, and high-temperature sintering of workpieces is performed in air medium. Plates are heated to sintering temperature and sintering is performed by penetrating electron beam. After sintering it is cooled down to temperature of 900-850°C by means of natural cooling of cell for radiation thermal sintering outdoors, further cooling down to room temperature is performed by means of passing through a cell for radiation thermal sintering of argon or nitrogen.

EFFECT: lower energy consumption, higher sintering speed, higher radar absorption.

2 tbl, 1 ex