Graphite irradiations 300°–1200°C

✍ Scribed by J.H. Cox Jr.; J.W. Helm

• Book ID: 102996795
• Publisher: Elsevier Science
• Year: 1969
• Tongue: English
• Weight: 817 KB
• Volume: 7
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(69)90115-8

✦ Synopsis

Irradiations of a large variety of graphites

have been conducted at tcmper:trut-es from 300"-1200°C to maximum neutron Huences of 2.7 X IO"' n\ t (E > 0. IX hlr').

As temperatures and neutron Huences increase, bulk expansion of the graphite becomes the controlling behavior in all orientatiotts. Materials which are well graphitized, highly crystalline, isotropic, and have a high CTE show the lowest contraction at moderate Huences. The dimensional-change data for all graphite types may be separated into two bands. The first band represents data for samples irradiated in the tetttperature range 300"-800"(:. 'I'he second band, which shows a highly accelerated dantag? rate, rcpresettts data fi)r samples irradiated at !W-I 2OOY:. Thw4, ttir transition I'rom the lower tl;tnl;lge rare' to tllc higher one takes place over-a narrow temperatut-e range (-X00"-!~OO"(~). iVitttin each band the data are grouped closcl~. I'hese observations are Imetl on reh theI>, stiial1 samples, generally less I tian 0.5 in. tl~a. by less rhan 4 in. ling. The behaviot~ of tltese small satnples may not exactly represent the behavior of larger pieces: ttowr\cr. iI is felt that expansion will ultimately hr r he controlling behavior in rhc lat-gct-si/cs ;IIv).