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Improved neutron absorption effectiveness for boron content aluminum materials

A neutron, composite material technology, used in the control of nuclear reactions, volume/mass flow generated by mechanical effects, reduction of greenhouse gases, etc.

Inactive Publication Date: 2007-06-27
ALCAN INT LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, composites are formed by expensive powder metallurgy routes

Method used

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  • Improved neutron absorption effectiveness for boron content aluminum materials
  • Improved neutron absorption effectiveness for boron content aluminum materials
  • Improved neutron absorption effectiveness for boron content aluminum materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Al-2.5wt%B alloys were prepared using a commercial Al-4%B master alloy. A microscopic view of a solid sample of the prepared material is shown in Figure 4, which graphically illustrates the large AlB 2 Characterization of intermetallic compound particles. After melting, the material was kept at 800 °C for 2 h to partially dissolve the original large boron-containing particles (AlB 2 ). Thereafter, 0.7wt% Ti was added to the molten metal to form many fine boron-containing species (TiB 2 or (AlTi)B 2 ) and the composite material is subsequently cast into the form of an ingot. Figure 5 is a micrograph of specimens taken from an ingot, showing that these fine specimens are evenly located within the larger AlB of the original cast alloy 2 between particles.

Embodiment 2

[0047] Al-1.0wt%B alloys were first prepared using a commercial Al-4%B master alloy. After melting, 3.0wt% B 4 C powder is added to the molten metal to form Al-B 4 C-B composites. The molten composite was kept at 800 °C for 2 h to partially dissolve the original large boron-containing particles (AlB 2 and B 4 C). Thereafter, 0.3wt% Ti was added to the molten composite, which was subsequently cast in the form of a cylindrical ingot. Figure 6 illustrates a sample taken from an ingot cast from a composite material thus treated, showing numerous in situ formed fine boron-containing species (TiB 2 or (AlTi)B 2 ), which is well distributed to fill the larger AlB 2 and B 4 C gaps between particles.

Embodiment 3

[0049] Preparation of Al-B 4 C-Gd composites. First, 2wt% Gd was added to molten aluminum for batch processing into Al-2%Gd alloy. followed by 8wt% B 4 C powder is added to this molten alloy to form Al-8B 4 C - 2% Gd composite, after which the composite was cast in the form of a cylindrical ingot. A sample of the cast ingot was taken, and Figure 7 shows a microscopic view of the sample, illustrating that during solidification of the ingot, fine Gd-Al intermetallics formed and tended to occupy the aluminum grain boundaries. In casting Al-B 4 Combining these intermetallic compounds in C composites greatly reduces the larger neutron-absorbing compounds (B 4 C) The gap between.

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Abstract

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.

Description

field of invention [0001] The present invention relates to a method of improving the neutron absorption efficiency of boron-based neutron absorber materials. Background technique [0002] There is great interest in the nuclear energy industry in structural materials which are able to absorb, and therefore not release, neutrons, for example in containers for spent fuel. The container is mainly made of aluminum (Al) based material. Boron (B) is an element commonly used to absorb neutrons. Boron can typically be identified as B 4 C, TiB 2 or simply to form AlB in an Al matrix 2 or AlB 12 The B joins the Al. [0003] There are generally two types of container products available: such as Boral TM Al-B like (AARBrocks & Perkins) 4 C powder metallurgy products, where aluminum alloy powder is mixed with boron carbide particles, and isotopically enriched Al-B products such as those produced by Eagle-Picher-Technologies LLC. Because of their intricate craftsmanship, both prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00B22D21/00C22C32/00G21F1/08C22C1/10G21C7/24
CPCG21Y2004/10C22C32/0073C22C32/0057G21Y2004/40B22D21/007Y02E30/39C22C2001/1052C22C1/1036G21C7/24G21Y2002/201Y02E30/30C22C1/1052C22C21/00G01F1/08C22C32/00B22D21/00
Inventor X·-G·陈G·迪贝N·斯图尔德
Owner ALCAN INT LTD
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