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High-temperature strengthening method for structural-functional integrated neutron absorbing material

A technology of absorbing materials and neutrons, which is applied in the field of high-temperature strengthening of neutron absorbing materials with integrated structure and functions, can solve problems such as difficult to meet the use requirements, strength attenuation, etc., and achieve the effects of avoiding early cracking, small stress concentration, and high activity

Inactive Publication Date: 2019-05-24
中广核工程有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But traditional B 4 C / Al composites usually use micron-sized B 4 C particles are used as reinforcements. Although the material strength is high at room temperature, its strength attenuates seriously with the increase of temperature, which is difficult to meet the use requirements at high temperatures.

Method used

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  • High-temperature strengthening method for structural-functional integrated neutron absorbing material
  • High-temperature strengthening method for structural-functional integrated neutron absorbing material
  • High-temperature strengthening method for structural-functional integrated neutron absorbing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1) Using 6061Al as the base material, Al 2 o 3 For the nano-reinforced phase, the preparation (Al 2 o 3 np+B 4 Cp) / 6061Al composite material, the nanometer Al that content is 1wt.% 2 o 3 , with a content of 10wt.% B 4 C powder, 6061Al powder with a content of 89wt.% was placed in a high-energy ball mill for uniform mixing and ball milling; the ball milling time was 10 hours, and the ball-to-material ratio was 1.5:1;

[0037] 2) The uniformly mixed powder is pressed into a billet by cold isostatic pressing, wherein the cold isostatic pressing pressure is 200Mpa, and the pressure is maintained for 10 minutes;

[0038] 3) The pressed ingot is placed in an aluminum sheath for welding, and the leakage rate after welding is lower than 3×10 -10Pa·m 3 After / s, vacuumize the aluminum sheath at 500°C for degassing, and the vacuum degree reaches 6×10 -4 At Pa, the aluminum sheath is sealed and welded, and the billet is sealed and welded in the aluminum sheath;

[0039] ...

Embodiment 2

[0045] Example 2 is basically the same as Example 1, except that the forming method is hot forging, the temperature of hot forging is 580°C, the pressure is 50MPa, and the holding time is 15min. The materials used are as follows:

[0046] Using 1060Al as the base material, Y 2 o 3 For the nano-reinforced phase, the preparation (Y 2 o 3np +B 4 C p ) / 1060Al composite material, where Y 2 o 3 The content is 2wt.%, B 4 The C content is 15wt.%, and the 1060Al content is 83wt.%.

Embodiment 3

[0050] Example 3 is basically the same as Example 1, except that the molding method is hot extrusion molding, the temperature of hot extrusion molding is 530° C., the pressure is 100 MPa, and the holding time is 5 minutes. The materials used are as follows:

[0051] Using 7075Al as the matrix material, ZrO 2 For the nano-reinforced phase, the preparation (ZrO 2 np+B 4 Cp) / 7075Al composite material, wherein, ZrO 2 The content is 3wt.%, B 4 The C content is 10wt.%, and the 7075Al content is 87wt.%.

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Abstract

The invention discloses a high-temperature strengthening method for a structural-functional integrated neutron absorbing material. According to the high-temperature strengthening method, powder metallurgy and pressure forming are adopted, and the high-temperature strengthening method comprises the following steps that (1), 5 to 20wt.% of B4C, 1 to 8wt.% of a nanometer oxide material, and aluminumalloy powder are uniformly mixed by high-energy ball milling; (2), uniformly mixed powder is subjected to isostatic cold pressing and then compression-molded into a billet, the compression-molded billet is placed in an aluminum wrapping sleeve to be subjected to high-temperature vacuum degassing treatment, the billet is sealed and welded in the aluminum wrapping sleeve after a required vacuum degree is reached, and then the billet andaluminum wrapping sleeve subjected to high-temperature vacuum degassing treatment are subjected to hot-pressing molding, hot forging molding, hot extrusion molding, or hot rolling molding; or the uniformly mixed powder in the step (1) is directly subjected to hot extrusion molding; (3), the material molded in the step (2) is compression-molded through isostatic cold pressing; and (4), the compression-molded material in the step (3) is rolled at a certain temperature to obtain a desired neutron absorbing material.

Description

technical field [0001] The invention belongs to the field of composite materials, and more specifically, the invention relates to a high-temperature strengthening method for a structure-function integrated neutron absorbing material. Background technique [0002] With the rapid development of nuclear energy, the comprehensive performance requirements of neutron shielding materials required for radiation protection are getting higher and higher. While using nuclear energy, spent fuel is inevitably generated, which poses a great threat to the environment and safety. Generally, after the spent fuel is unloaded from the core, it is first stored in the reactor, and after the short-lived nuclide decays for a certain period of time, it is sent for reprocessing or directly stored in a geological repository. Good neutron absorbing material is required for protection. [0003] The current storage of spent fuel includes wet storage and dry storage, among which the dry storage contain...

Claims

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Application Information

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IPC IPC(8): C22C1/05B22F3/04B22F3/18B22F3/20C22C21/00C22C32/00G21F1/08
Inventor 王鑫张鹏程刘彦章庞晓轩王傲松白彬唐邵华罗昊左永德张佳佳唐琼辉
Owner 中广核工程有限公司
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