CN104310400B - A kind of boron carbide neutron absorber - Google Patents
A kind of boron carbide neutron absorber Download PDFInfo
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- CN104310400B CN104310400B CN201410525417.XA CN201410525417A CN104310400B CN 104310400 B CN104310400 B CN 104310400B CN 201410525417 A CN201410525417 A CN 201410525417A CN 104310400 B CN104310400 B CN 104310400B
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Abstract
The present invention relates to a kind of neutron absorber for absorbing stray neutron, absorber that espespecially a kind of, originate wide raw material low by cost is made also realizes not affecting the detection of detector and absorbing a kind of boron carbide neutron absorber of stray neutron target in radial neutron howitzer, the raw material of described boron carbide neutron absorber mainly includes boron carbide powder, colloid and firming agent, the content ratio of described colloid and firming agent is 5:2, and the content ratio of colloid and boron carbide powder is 1:19-1:4；The raw material of the boron carbide neutron absorber of the present invention easily obtains, the formula adopted solves the problem that protium affects neutron-absorbing, cost reduces, overcome boron carbide ceramics material price that present stage uses costly, the shortcoming of the more difficult acquisition of raw material, but the boron carbide neutron absorber of gained of the present invention can reach boron carbide ceramics material be can achieve the effect that or reach better effect, it it is a kind of extensive use neutron absorber that can bring long-term economic benefit.
Description
Technical field
The present invention relates to a kind of neutron absorber for absorbing stray neutron, absorber that espespecially a kind of, originate wide raw material low by cost is made the detection realizing not affecting detector and in radial neutron howitzer, absorb a kind of boron carbide neutron absorber of stray neutron target.
Background technology
Neutron and X ray are all the powerful measure that the mankind explore material microstructure, neutron is not charged, there is magnetic moment, penetrance is strong, light element can be differentiated, isotope and neighbour's element, and have the nondestructive feature to sample, therefore neutron not only can explore material static state microstructure, its dynamical mechanism can also be studied, at present, Neutron scattering technology is at biology, life, the research fields such as medicine play the effect that X ray cannot replace, Neutron scattering technology carries out in neutron spectrograph, the raising of the performance parameters such as the resolution for the properly functioning of neutron spectrograph and spectrometer, neutron howitzer as one of its critical component plays an important role.
One of Main Function of radial neutron howitzer is exactly the loss reducing the neutron by collimator internal cavity, it is achieved the method for this effect is at cavity evacuation or passes into certain gaseous environment (helium or argon) in cavity；Its another main method is to utilize the neutron absorber being attached on collimator inwall to absorb background neutron, therefore to ensure that the attachment of neutron absorber can't be impacted by the vacuum deformation of cavity, and do not result in inserted sheet deviation physical plane, stop effective neutron.
Conventional neutron absorber material includes boron, gadolinium and cadmium etc., owing to most position sensitive detectors is more weak for the separating capacity of neutron and gamma ray, the nuclear reaction of neutron and gadolinium element is mainly n-gamma reaction, absorb neutron and release gamma ray, it is unfavorable for the neutron detection of back-end location sensitive detector, and the nuclear reaction of neutron and boron element is mainly n-alpha reaction, the detection of detector can't be brought a lot of unfavorable factors, boron carbide material therefore can be selected as the neutron absorber material of radial neutron howitzer.
Conventional neutron absorber has boron carbide ceramics plate, boron carbide-aluminium composite material plate, boron carbide powder colloid mixture is cold-pressed into template and boron carbide powder painting mode etc., but, boron carbide powder colloid mixture is cold-pressed into template and contains more epoxies colloid, constitute containing more hydrogen and oxygen element, cause spuious scattering；The mode of boron carbide powder painting needs also exist for introducing epoxies colloid, and thickness is restricted, and is easily lost efficacy by irradiation；Aluminium base boron carbide composite material, boron carbide ceramics material Weldability are still to be tested, the boron carbide content simultaneously adulterated is few, same restricted in thickness requirement, and the price of such material of present stage is costly, and it is generally required to from external import, it is therefore desirable to a kind of price appropriateness, be easy to the neutron absorber that can fully absorb stray neutron inside collimator of batch production.
Summary of the invention
For solving the problems referred to above, it is contemplated that disclose a kind of neutron absorber for absorbing stray neutron, absorber that espespecially a kind of, originate wide raw material low by cost is made also realizes not affecting the detection of detector and absorbing a kind of boron carbide neutron absorber of stray neutron target in radial neutron howitzer.
For achieving the above object, the technical solution used in the present invention is: a kind of boron carbide neutron absorber, the raw material of described boron carbide neutron absorber mainly includes boron carbide powder, colloid and firming agent, the content ratio of described colloid and firming agent is 5:2, and the ratio range of colloidal content and boron carbide powder content is 1:19-1:4.
Described boron carbide neutron absorber mainly includes 70-85 part boron carbide powder, 4.5-17.5 part colloid and 1.8-7 part firming agent.
Having coarse grain powder in described boron carbide powder, the particle size range of coarse grain powder is 450-500 μm.
Having particulate powders in described boron carbide powder, the particle size range of particulate powders is 60-120 μm.
Described boron carbide powder is mixed with the particulate powders of 15%-22% content by the coarse grain powder of 78%-85% content and forms.
Described boron carbide neutron absorber can casting be square block, or be spherical shape.
A kind of boron carbide neutron absorber of preparation, the content ratio of described boron carbide powder, colloid and firming agent is 45:5:2, and wherein the content ratio thick, particulate powders in boron carbide powder is 4:1.
Boron carbide neutron absorber described in preparation includes 81 parts of boron carbide powders, 9 parts of colloids and 3.6 parts of firming agent, and wherein the coarse grain powder in boron carbide powder is 64.8 parts, and particulate powders is 16.2 parts.
The beneficial effects of the present invention is: boron carbide neutron absorber of the present invention is mainly used in being attached to radial neutron howitzer inwall to absorb stray neutron, its raw material mainly includes boron carbide powder, colloid and firming agent, overcome too much protium and affect the defect of neutron-absorbing, make to obtain fully stopping and absorbing of neutron absorber during the neutron scattering of collimator inside, the present invention selects to adopt 4.5-17.5 part colloid mixing 70-85 part boron carbide powder, both the composition of protium had been controlled, the thickness of boron carbide neutron absorber can be made again to reach controllability effect；Both can reach not affect the purpose of neutron-absorbing, colloid and boron carbide powder can be made again to stir；Again owing to the collocation of boron carbide coarse grain powder with boron carbide particulate powders controls, protium is made to reduce, because adopting the coarse grained boron carbide powder of 78%-82% to mix composition with the fine grain boron carbide powder of 18%-22%, the colloid making boron carbide powder and low content rightly is sufficiently stirred for, while being conducive to stirring, more can reach the effect of smooth molding.
The raw material of the boron carbide neutron absorber of the present invention easily obtains, the formula adopted solves the problem that protium affects neutron-absorbing, and cost is substantially reduced, overcome the boron carbide ceramics material price of present stage use costly, the shortcoming of the more difficult acquisition of raw material, and the boron carbide neutron absorber of gained of the present invention can reach boron carbide ceramics material and can achieve the effect that or reach better effect, the neutron-absorbing body thickness prepared such as boron carbide ceramics material is generally 4mm, and neutron-absorbing body thickness prepared by the formula of the present invention is generally 8mm, but the cost of material of the present invention is boron carbide ceramics material 1/10th, therefore the present invention is a kind of neutron absorber that can be mass extensive use and can bring long-term economic benefit.
Detailed description of the invention
The following detailed description of the specific embodiment of the present invention:
Embodiment one
A kind of boron carbide neutron absorber, the raw material of described boron carbide neutron absorber mainly includes boron carbide powder, colloid and firming agent, boron carbide neutron absorber can injection mo(u)lding be square block or other shapes, the ratio of described colloidal content and boron carbide powder content is 1:9, the ratio of colloidal content and curing agent content is 5:2, described boron carbide neutron absorber mainly includes 81 parts of boron carbide powders and 9 parts of colloids, and 3.6 parts of firming agent, the unit constituting colloid have more hydrogen and oxygen element, too much protium affects neutron-absorbing, cause the abundant stop that cannot obtain neutron absorber during the internal neutron scattering of collimator or absorb, described boron carbide powder is mixed with the particulate powders of 20% content by the coarse grain powder of 80% content and forms, including 64.8 parts of boron carbide coarse grain powder and 16.2 parts of boron carbide particulate powders, the granule of boron carbide powder is more thin, need the colloid for mix and blend more many, directly contribute protium to increase, but the granule of boron carbide powder is more thick, more weak with the degree that colloid stirs, thus the boron carbide neutron absorber effect of molding is bad, controlling the grain thickness of boron carbide powder well can for making colloid amount decline, protium reduces, the particle size range of the described coarse grain powder in boron carbide powder is 500 μm, the particle size range of particulate powders is 100 μm；When preparing boron carbide neutron absorber, absorber is prepared by described composition ratio, and control the absorbed thickness of molding as required, if thickness can be 8mm, colloid may select epoxy resin E51 type or epoxy resin E44 type or other colloids, described colloid is thick with boron carbide, the content of particulate powders had both controlled the composition of protium, the molding thickness of boron carbide neutron absorber can be made again to reach desirable effect, make can reach the effect of efficient absorption neutron inside neutron howitzer, the colloidal content of appropriateness both can reach not affect the purpose of neutron-absorbing, colloid and boron carbide powder can be made again to stir, reach the effect of smooth molding.
Embodiment two
A kind of boron carbide neutron absorber, the raw material of described boron carbide neutron absorber mainly includes boron carbide powder, colloid and firming agent, boron carbide neutron absorber can be square block or other shapes, the ratio of described colloidal content and boron carbide powder content is 1:4, the ratio of colloidal content and curing agent content is 5:2, described boron carbide neutron absorber mainly includes 70 parts of boron carbide powders and 17.5 parts of colloids, and 7 parts of firming agent, the unit constituting colloid have more hydrogen and oxygen element, too much protium affects neutron-absorbing, cause the abundant stop that cannot obtain neutron absorber during the internal neutron scattering of collimator or absorb, described boron carbide powder is mixed with the particulate powders of 22% content by the coarse grain powder of 78% content and forms, including 54.6 parts of boron carbide coarse grain powder and 15.4 parts of boron carbide particulate powders, the granule of boron carbide powder is more thin, need the colloid for mix and blend more many, directly contribute protium to increase, but the granule of boron carbide powder is more thick, more weak with the degree that colloid stirs, thus the boron carbide neutron absorber effect of molding is bad, controlling the grain thickness of boron carbide powder well can for making colloid amount decline, protium reduces, the particle size range of the described coarse grain powder in boron carbide powder is 480 μm, the particle size range of particulate powders is 100 μm；When preparing boron carbide neutron absorber, absorber is prepared by described composition ratio, and control the absorbed thickness of molding as required, if thickness can be 8mm, colloid may select epoxy resin E51 type or epoxy resin E44 type or other colloids, described colloid is thick with boron carbide, the content of particulate powders had both controlled the composition of protium, the molding thickness of boron carbide neutron absorber can be made again to reach desirable effect, make can reach the effect of efficient absorption neutron inside neutron howitzer, the colloidal content of appropriateness both can reach not affect the purpose of neutron-absorbing, colloid and boron carbide powder can be made again to stir, reach the effect of smooth molding.
The above, it it is only presently preferred embodiments of the present invention, not the technical scope of the present invention is imposed any restrictions, the technical staff of the industry, under the inspiration of the technical program, some deformation and amendment, every any amendment, equivalent variations and modification above embodiments made according to the technical spirit of the present invention can be made, all still fall within the scope of technical solution of the present invention.
Claims (3)
1. a boron carbide neutron absorber, it is characterized in that: the raw material of described boron carbide neutron absorber includes boron carbide powder, colloid and firming agent, the content ratio of described colloid and firming agent is 5:2, and the ratio range of colloidal content and boron carbide powder content is 1:9-1:4；Wherein boron carbide neutron absorber is made up of 70-85 part boron carbide powder, 4.5-17.5 part colloid and 1.8-7 part firming agent, described boron carbide powder is mixed with the particulate powders of 15%-22% content by the coarse grain powder of 78%-85% content and forms, wherein the particle size range of coarse grain powder is 450-480 μm, and the particle size range of particulate powders is 60-120 μm；Described boron carbide neutron absorber casting is square block, or is spherical shape.
2. a kind of boron carbide neutron absorber according to claim 1, it is characterised in that: the content ratio of described boron carbide powder, colloid and firming agent is 45:5:2, and wherein the content ratio thick, particulate powders in boron carbide powder is 4:1.
3. a kind of boron carbide neutron absorber according to claim 2, it is characterized in that: the boron carbide neutron absorber described in preparation includes 81 parts of boron carbide powders, 9 parts of colloids and 3.6 parts of firming agent, wherein the coarse grain powder in boron carbide powder is 64.8 parts, and particulate powders is 16.2 parts.
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| CN105845191A (en) * | 2016-05-06 | 2016-08-10 | 东莞中子科学中心 | Plug-in shell structure used for neutron collimator |
| CN108333192A (en) * | 2018-01-25 | 2018-07-27 | 中国科学院高能物理研究所 | A kind of coarse collimator in rear end for neutron scattering |
| CN108806818A (en) * | 2018-04-17 | 2018-11-13 | 东莞理工学院 | A kind of four knife diaphragms of adjustable neutron flow |
| CN108750983B (en) * | 2018-06-07 | 2024-04-26 | 东莞理工学院 | Neutron beam window maintenance platform lifting device working under radiation and lifting method thereof |
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| US4198322A (en) * | 1977-12-01 | 1980-04-15 | The Carborundum Company | One-step curing method for manufacture of neutron absorbing plates |
| US4213883A (en) * | 1977-12-30 | 1980-07-22 | The Carborundum Company | Method for manufacture of neutron absorbing articles |
| CN102214488A (en) * | 2011-05-31 | 2011-10-12 | 航天材料及工艺研究所 | Boron-carbide-containing graphite absorber ball and preparation process thereof |
| CN102485810A (en) * | 2009-11-30 | 2012-06-06 | 北京市射线应用研究中心 | Dual-component low-temperature curing type putty for mixed nuclear radiation environment |
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Patent Citations (4)
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|---|---|---|---|---|
| US4198322A (en) * | 1977-12-01 | 1980-04-15 | The Carborundum Company | One-step curing method for manufacture of neutron absorbing plates |
| US4213883A (en) * | 1977-12-30 | 1980-07-22 | The Carborundum Company | Method for manufacture of neutron absorbing articles |
| CN102485810A (en) * | 2009-11-30 | 2012-06-06 | 北京市射线应用研究中心 | Dual-component low-temperature curing type putty for mixed nuclear radiation environment |
| CN102214488A (en) * | 2011-05-31 | 2011-10-12 | 航天材料及工艺研究所 | Boron-carbide-containing graphite absorber ball and preparation process thereof |
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| 粘结碳化硼材料中子屏蔽性能及制备工艺研究;柯于斌等;《材料科学与工艺》;20131231;第21卷(第6期);第30-33页"1 实验"及"2 结果与讨论" * |
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