The durability test of the capsule material used for corrosion test in lithium

not registered; Kawai, Masataka *

Durability in lithium of the capsule material which will be used for corrosion test of heat resisting metals was examined and the corrosion test procedure was confirmed. The tests were carried out from 500C till maximum 1200C. Heating time per a test was 100 hr, and the capsule and the corrosion test specimens were observed after each test. The results were as follows. (1)The capsule material of Nb-1Zr was not remarkably attacked ti11 1200C. (2)Welding part of capsule specimen was heat treated at 1200C, 1 hr in argon to, improve corrosion resistance to lithium. At the surface of welding bead and heat affect zone of this part, grain boundaries were appeared from about 800C. It shows that the welding part is less corrosion resistance compared with base metal. But deep corrosion was not observed. (3)The capsule used for these tests was also observed, and obvious crack and lithium leak was not found. (4)From these tests it is confirmed that Nb-1Zr capsule is usable to lithium corrosion test until following time at each temperature. 800C : 600hr or more 1000C : 400hr or more 1200C : 200hr or more (5)Corrosion of stainless steel include Ni was initiated at 700-800C, and over 1000C it became conspicuously.