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Fluoride sintered compact for neutron moderator, and method for producing said fluoride sintered compact

A manufacturing method and sintered body technology, applied in the direction of magnesium fluoride, moderator/core structure, magnesium halide, etc., can solve the problems of weak mechanical strength and lack of

Active Publication Date: 2015-05-20
UNIV OF TSUKUBA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

MgF 2 , CaF 2 , YF 5 The biggest disadvantage of fluoride ceramic sintered bodies such as LiF and LiF is weak mechanical strength. The invention to solve this problem is to combine these fluorides with Al 2 o 3 Sintered body compounded at a certain ratio
However, the corrosion resistance and mechanical strength of the sintered body produced by this method, regardless of the combination, are obtained only with those of fluoride and Al 2 o 3 A sintered body with intermediate properties of both properties, and a sintered body exceeding both properties through compounding

Method used

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  • Fluoride sintered compact for neutron moderator, and method for producing said fluoride sintered compact
  • Fluoride sintered compact for neutron moderator, and method for producing said fluoride sintered compact
  • Fluoride sintered compact for neutron moderator, and method for producing said fluoride sintered compact

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0177] High-purity MgF2 Raw material (average particle size 20μm, purity 99.9wt% or more) is pulverized into high-purity MgF 2 Powder (average particle size 1.2 μm, purity 99.9 wt%). In this powder with respect to the MgF 2 Powder 100, 0.2wt% hydroxymethyl cellulose (CMC) solution was added as a sintering aid, mixed in a jar mill for 12 hours as a starting material.

[0178] Fill the starting material into the template (the mold size is 220mmx220mmxH150mm), and use a uniaxial press to increase the uniaxial pressure to 10MPa for compression and molding.

[0179] Put the press molded body (dimensions about 220mmx220mmxt85mm) into a thick plastic bag, degas it, and fill the sealed molded body into the forming part of the cold room isometric pressure molding (CIP) machine (internal dimensions: inner diameter 350mmxH120mm) . In the gap between the plastic bag in which the pressurized body was packed and the forming part of the CIP machine, clean water was filled, and the molding...

Embodiment 2

[0187] Using the same starting materials as in Example 1 above, similarly, for a molded body subjected to uniaxial press molding and cold isotropic pressure molding (CIP), temporary sintering was performed at 550° C. for 10 hours in an air environment. , to obtain a temporary sintered body of 208mmx208mmxt73mm. The temporary sintered body was heated from room temperature to 750° C. at a certain speed in a nitrogen atmosphere for 6 hours, and kept at the same temperature for 9 hours. After that, heat up to 920°C at a certain speed for 2 hours, keep the same temperature for 2 hours, then cool naturally to the set take-out temperature of 100°C, and then take it out. The approximate size of the sintered body is 195mmx195mmxt64mm, and the bulk density is 2.90g / cm 3 (relative density 92.1%), the sintered state is good.

[0188] As shown in Table 2, the deceleration performance of neutron rays and the evaluation results of various characteristics were all good.

Embodiment 3

[0190] Using the same starting materials as in Example 1 above, similarly for the molded body that has been subjected to uniaxial press molding and cold isotropic pressure molding (CIP), it is temporarily subjected to 600°C for 8 hours in an air environment. Sintering to obtain a temporary sintered body of 206.5mmx207mmxt71mm. The temporary sintered body was heated from room temperature to 840° C. at a certain speed in a nitrogen atmosphere for 6 hours, and kept at the same temperature for 12 hours. After that, the temperature was raised to 1080° C. at a certain speed for 2 hours, and kept at the same temperature for 1 hour. Then, it was naturally cooled to the set take-out temperature of 100° C., and then taken out. The approximate size of the sintered body is 192mmx192mmxt61mm, and the bulk density is 3.00g / cm 3 (relative density 95.2%), the sintered state is good.

[0191] As shown in Table 2, the deceleration performance of neutron rays and the evaluation results of vari...

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Abstract

A fluoride sintered body suitable for a moderator which moderates high-energy neutrons so as to generate neutrons for medical care with which an affected part of the deep part of the body is irradiated to make a tumor extinct comprises MgF 2 of a compact polycrystalline structure having a bulk density of 2.90g / cm 3 or more and as regards mechanical strengths, a bending strength of 10MPa or more and a Vickers hardness of 71 or more.

Description

technical field [0001] The present invention relates to a fluoride sintered body and a manufacturing method thereof, and more particularly, to fluoride sintering for neutron ray deceleration materials having a dense structure suitable for deceleration materials for suppressing the radiation velocity of various radiations such as neutron rays body and its method of manufacture. Background technique [0002] Calcium Fluoride (CaF 2 ) single crystal, magnesium fluoride (MgF 2 ) Fluorides such as single crystals are widely used in the field of optics. Fluoride is rarely used outside of optics, (CaF 2 ) single crystals are sometimes used in semiconductor manufacturing processes due to their high plasma resistance. There are cases where it is applied to parts that require the most plasma resistance in plasma etching furnaces for silicon wafers, such as the design of connecting plates or ceilings. But since CaF 2 A single crystal is extremely expensive, so there is no report ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/553
CPCC04B35/553C04B35/64C04B2235/77C04B2235/658C04B2235/48C04B2235/661C04B2235/96C04B2235/5436C04B2235/604C04B2235/6567C04B2235/95C04B35/6261G21C5/12G21K1/00C04B2235/656C04B2235/9615C04B2235/3206C04B2235/6583C04B35/62695C01F5/28
Inventor 熊田博明中村哲之重岡卓二池田毅
Owner UNIV OF TSUKUBA
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