Manufacturers of the assembled al - mg - al2o3 - mgo - material for nuclear engineering fields of application as well as processes for their preparation

摘要

1,200,969. Reactors. EUROPEAN ATOMIC ENERGY COMMUNITY. 13 Aug., 1968 [31 Aug., 1967], No. 38716/68. Heading G6C. [Also in Division C7] A composite sintered material of Al-Mg- Al 2 O 3 -MgO suitable for nuclear fuel element cans and reactor pressure tubes is made by grinding Al-Mg alloy powder in an oxygen containing atmosphere and then sintering in vacuo. The Al-Mg powder preferably containing 2-5% Mg is formed by atomizing the molten alloy or a wire of the alloy, and the powder is collected in a container of Al or Al alloy. The powder is ground with stearic acid, stearates or a silicone in grinding mills of Al or Al alloy using balls of Al or Al alloy to produce a composite containing 2-20% Al 2 O 3 and 1-10% MgO. The powder is then cold compacted, sintered at 550-625‹ C. in vacuo at a pressure of 10SP-2/SP to 10SP-5/SP mm. Hg for 10-30 hours, hot pressed at 600‹ C. and 5-6 t/cmSP2/SP. Extrusion and drawing operations may then be carried out to form tubes.