Radiation shielding composition and method of making the same

Patent metadata

Field	Value
Publication number	US-2017335433-A1
Application number	US-201515525400-A
Country	US
Kind code	A1
Filing date	Nov 9, 2015
Priority date	Nov 10, 2014
Publication date	Nov 23, 2017
Grant date	—

Abstract

Described herein is a radiation shielding composition and a method for making comprising: (i) a boron-containing powder wherein the boron-containing powder comprises at least a bimodal particle size distribution, and (ii) a metal, wherein the metal encapsulates the ceramic powder to form the radiation shielding composition.

First claim

1 . A radiation shielding composition comprising:
(i) a boron-containing powder wherein the boron-containing powder comprises at least a bimodal particle size distribution, and (ii) a metal, wherein the metal encapsulates the ceramic powder to form the radiation shielding composition.

2 . The radiation shielding composition of claim 1 , wherein the radiation shielding composition comprises at least 5% by mass of boron-containing powder.

3 . The radiation shielding composition of claim 1 , wherein the at least bimodal particle size distribution comprises at least one D 50 of at least 10 micrometers.

4 . The radiation shielding composition of claim 1 , wherein the at least bimodal particle size distribution comprises modes of at least 1 micrometer and at most 200 micrometer.

5 . The radiation shielding composition of claim 1 , wherein the boron-containing powder is selected from boron carbide.

6 . The radiation shielding composition of claim 1 , wherein the metal is selected from at least one of aluminum, magnesium, and stainless steel and combinations thereof.

7 . A method for making a radiation shielding composition comprising:
(a) providing (i) a boron-containing powder wherein the boron-containing powder comprises at least a bimodal particle size distribution, and (ii) a metal powder; (b) mixing the metal powder and the boron-containing powder to prepare a mixed powder; and (c) performing hot working on the mixed powder to obtain the radiation shielding composition.

8 . The method of claim 7 , wherein the radiation shielding composition comprises at least 5% by mass of the boron-containing powder.

9 . The method of claim 7 , wherein the at least bimodal particle size distribution comprises at least one D 50 of at least 30 micrometers.

10 . The method of claim 7 , wherein the at least bimodal particle size distribution comprises modes of at least 1 micrometer and at most 200 micrometer.

11 . The method of claim 7 , wherein the boron-containing powder is selected from boron carbide.

12 . The method of claim 7 , wherein the metal powder is selected from at least one of aluminum, magnesium, and stainless steel and combinations thereof.

13 . The method of claim 7 , wherein the metal powder comprises at least a bimodal particle size distribution.

14 . The method of claim 13 , wherein the at least a bimodal particle size distribution of the metal powder comprises at least one D 50 of at least 30 micrometers.

15 . The method of claim 7 , further comprising compacting the mixed powder.

16 . The method of claim 15 , wherein the compacting is preformed using at least one of: vibration, solid compaction, cold isostatic press, and cold uniaxial press.

17 . The method of claim 7 , wherein the metal box is selected from at least one of aluminum, magnesium, and stainless steel.

18 . The method of claim 7 , wherein the mixed powder is pre-heated prior to the hot working.

19 . The method of claim 7 , wherein the hot working is selected from at least one of hot rolling, hot extrusion, and hot forging.

20 . A method of making a radiation shielding composition comprising:
(a) providing (i) a boron-containing powder wherein the boron-containing powder comprises at least a bimodal particle size distribution, and (ii) a metal powder; (b) mixing the metal powder and the boron-containing powder to prepare a mixed powder; (c) filling a metal container with the mixed powder; (d) disposing a top forming plate onto the metal container in solid abutment against the metal container comprising the powder and sealing around its edges to produce a pre-rolling assembly; and (e) performing hot working on the pre-rolling assembly to obtain the radiation shielding composition with a metal cladding.

Assignees

• 3M Innovative Properties Co
• Nat Res Council Canada

Inventors

• Landry-Désy Étienne
• Bernier Fabrice
• Giasson Geneviéve
• Nawaz Muhammad Z

Classifications

• C22C29/062

  based on B4C · CPC title

• G21F1/08

  Metals; Alloys; Cermets, i.e. sintered mixtures of ceramics and metals · CPC title

• B22F2998/10

  Processes characterised by the sequence of their steps · CPC title

• G21F1/06 Primary

  Ceramics; Glasses; Refractories (cermets G21F1/08) · CPC title

• B22F2003/185

  by hot rolling, below sintering temperature · CPC title