C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 21/00 (2006.01) B22D 21/00 (2006.01) C22C 32/00 (2006.01) G21F 1/08 (2006.01)
Patent
CA 2563444
A method is described for improving neutron absorption in aluminum-based cast composite material, which comprises preparing a molten composite from an aluminum alloy matrix and aluminum-boron intermetallics containing relatively large boron-containing particles, and either (a) heating the composite and holding for a time sufficient to partially dissolve the boron-containing particles and then adding titanium to form fine titanium diboride particles, and casting the composite, or (b) adding gadolinium or samarium to the molten composite or to the aluminum alloy matrix and casting the composite to precipitate fine particles of Gd-Al or Sm-Al within the cast composite, said fine particles filling gaps around the large boron-containing particles with neutron absorbing material. A neutron absorbing cast composite material is obtained comprising neutron absorbing compounds in the form of large particles comprising B4C or an aluminum-boron intermetallic and a distribution of fine particles or precipitates comprising TiB2 or (AlTi)B2, Sm-aluminum intermetallic compounds or Gd-aluminum intermetallic compounds.
L'invention concerne un procédé qui permet d'améliorer l'absorption des neutrons dans un matériau composite coulé à base d'aluminium, selon lequel on prépare un composite fondu à partir d'une matrice dans un alliage d'aluminium et d'intermétalliques aluminium-bore contenant des particules contenant du bore relativement grandes, et (a) on chauffe le composite pendant une durée suffisante pour dissoudre partiellement les particules contenant du bore, et on ajoute ensuite du titane pour former de fines particules de diborure de titane, et on coule le composite, ou (b) on ajoute du gadolinium ou du samarium au composite fondu ou à la matrice en alliage d'aluminium et on coule le composite pour précipiter de fines particules de Gd-Al ou Sm-Al à l'intérieur du composite coulé, lesdites particules fines remplissant les trous autour des grandes particules contenant du bore avec un matériau absorbant les neutrons. On obtient de la sorte un matériau composite coulé absorbant les neutrons qui comprend des composés absorbant les neutrons sous la forme de grandes particules renfermant du B¿4?Cu ou un intermétallique aluminium-bore et une distribution de particules fines ou des précipités renfermant du TiB¿2? ou du (AlTi)B¿2?, des composés intermétalliques Sm-aluminium ou des composés intermétalliques Gd-aluminium.
Chen Xiao-Guang
Dube Ghyslain
Steward Nigel
Alcan International Limited
Kirby Eades Gale Baker
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