CN112195357A - Neutron absorbing material and preparation method thereof - Google Patents
Neutron absorbing material and preparation method thereof Download PDFInfo
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- CN112195357A CN112195357A CN202011059618.7A CN202011059618A CN112195357A CN 112195357 A CN112195357 A CN 112195357A CN 202011059618 A CN202011059618 A CN 202011059618A CN 112195357 A CN112195357 A CN 112195357A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/05—Mixtures of metal powder with non-metallic powder
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/0408—Light metal alloys
- C22C1/0416—Aluminium-based alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C21/00—Alloys based on aluminium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/0047—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents
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- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F1/00—Shielding characterised by the composition of the materials
- G21F1/02—Selection of uniform shielding materials
- G21F1/08—Metals; Alloys; Cermets, i.e. sintered mixtures of ceramics and metals
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
- G21F9/28—Treating solids
- G21F9/34—Disposal of solid waste
Abstract
The preparation method of the neutron absorption material provided by the invention comprises the steps of adding aluminum powder and boron carbide particles into a nano particle turbid liquid in a vacuum environment to form powder slurry, carrying out vacuum drying on the powder slurry, then carrying out pressing under a vacuum condition to obtain a blank, carrying out vacuum sintering on the blank to obtain a blank, extruding the blank into a plate, and rolling the plate to obtain the nano silicon carbide-nano aluminum oxide-boron carbide-aluminum neutron absorption material.
Description
Technical Field
The invention relates to the technical field of new materials, in particular to a neutron absorption material and a preparation method thereof.
Background
The nuclear fuel is changed into spent fuel after running and burning in the reactor, and is discharged from the reactor regularly, and if the nuclear fuel is not disposed properly, an immeasurable disaster is caused. The spent fuel needs neutron absorption materials to absorb thermal neutrons released by the spent fuel in the transportation and storage processes, so that the spent fuel is ensured to be in a safe subcritical state. The spent fuel is stored by adopting wet storage and dry storage modes in various countries around the world, wherein the dry storage with reliable technology, low maintenance cost and short construction period still becomes the mainstream. Different from the environment of a wet storage pool, the service temperature of the neutron absorption material for external storage is 350 ℃, and more rigorous requirements are put on the high-temperature performance of the material, and the B4C/Al neutron absorption material for domestic commercial dry storage has insufficient high-temperature strength and needs to be matched with a stainless steel grid for use. Stainless steel has poor heat conductivity, so that the dry storage facility is not safe and reliable for long-term use and has low storage density. It is required to develop a neutron absorbing material with high temperature, high strength and high thermal conductivity as a structural function integrated material for dry storage facilities.
The existing data search finds that no commercial report of high-temperature, high-strength and high-heat-conductivity neutron absorbing material exists in China at present. The patent with application number 201910094465.0 discloses a new-type oxide dispersion strengthened neutron-absorbing material, which uses nano Al2O3The oxide dispersion strengthening neutron absorption material prepared by taking the nano oxide as a reinforcing phase and B4C as a neutron absorber has high-temperature strength, can be used for neutron absorption function and structural support function, and is still implementedThe sample with the best combination of properties has the room temperature thermal conductivity of 135W/(m × K), and the thermal conductivity of the sample is further reduced as the temperature is increased to the service temperature of 350 ℃, so that the service requirement is difficult to meet. The literature "Mechanical and functional properties of ultra fine grained Al with re-formed by nano-Al2O3 particles" reports the self-formed nano Al on the surface layer of aluminum powder2O3Can be used as a source for diffusing the reinforcing phase, and simultaneously, nano Al is added2O3The strength of the composite material can be further improved. Due to Al2O3The ceramic has low thermal conductivity, and the thermal conductivity of the composite material is along with Al2O3The content is increased and reduced, and the preparation process adopted in the literature is complex and takes a long time.
Disclosure of Invention
In view of this, it is necessary to provide a method for preparing a neutron absorption material with good distribution uniformity of the enhanced phase, high density, high room temperature and high temperature mechanical strength, and high thermal conductivity.
A method of making a neutron-absorbing material, comprising the steps of:
preparing a nano particle suspension;
adding aluminum powder and boron carbide particles into the nano particle suspension in a vacuum environment to form powder slurry;
carrying out vacuum drying on the powder slurry, and then pressing under a vacuum condition to obtain a blank;
sintering the blank in vacuum to obtain a blank;
and extruding the blank into a plate, and rolling the plate to obtain the nano silicon carbide-nano aluminum oxide-boron carbide-aluminum neutron absorbing material.
In some embodiments, before the step of preparing the nanoparticle suspension, the method further comprises a step of vacuum drying the aluminum powder, the boron carbide particles and the nano silicon carbide powder.
In some embodiments, the step of preparing the nanoparticle suspension specifically includes:
adding nano silicon carbide powder into an organic solvent, and carrying out mechanical stirring and ultrasonic dispersion treatment to ensure that the nano silicon carbide particles are completely agglomerated and scattered to form a nano particle suspension; wherein: the time of the mechanical stirring and ultrasonic dispersion treatment is 1-15 min.
In some embodiments, in the vacuum environment, the step of adding aluminum powder and boron carbide particles into the nanoparticle suspension to form powder slurry specifically includes:
adding aluminum powder and boron carbide particles into the suspension of the nano particles to obtain mixed slurry, placing the mixed slurry into a non-intrusive powder mixer, mixing for 2-10min under normal pressure, starting a vacuum pump to vacuumize a mixing chamber, continuously mixing for 2-5min under a vacuum environment, unloading the vacuum, stopping powder mixing, and forming powder slurry.
In some embodiments, in the mixed slurry, the mass ratio of the boron carbide particles is 5-25 wt%, the mass ratio of the nano silicon carbide particles is 0.5-5 wt%, and the balance is aluminum powder; in the nano-particle suspension, the proportion relation between the powder mass and the nano-particle suspension is 1.5 g: 1 ml-2.5 g: 1 ml.
In some embodiments, the step of pressing the powder slurry under a vacuum condition after vacuum drying to obtain a blank specifically includes:
drying the powder slurry in a vacuum drying oven; wherein: drying at 40-100 deg.C, preferably 80 deg.C for 1-12 hr under vacuum degree of 0.1-10 Kpa;
putting the powder after vacuum drying into a cold pressing sleeve, vacuumizing, removing air, packaging, and then putting into a cold isostatic press for pressing; wherein the cold isostatic pressing pressure is 250-400MPa, and the cold pressing time is 1-5 min.
In some embodiments, the step of vacuum sintering the blank to obtain the green body specifically includes:
and sintering the blank in vacuum at 400-600 ℃ for 2-24h to obtain the blank.
In some embodiments, the step of extruding the blank into a plate and rolling the plate to obtain the nano silicon carbide-nano alumina-boron carbide-aluminum neutron absorbing material specifically includes:
and extruding the blank into a plate, and rolling the plate to a proper thickness to obtain the nano silicon carbide-nano aluminum oxide-boron carbide-aluminum neutron absorption material, wherein the extrusion temperature is 350-550 ℃, the extrusion ratio is 4: 1-16: 1, the rolling temperature is 350-550 ℃, and the single-pass deformation is 5-20%.
In some embodiments, the aluminum powder size D50 is 1-3 μm, the boron carbide particle size D50 is < 50 μm, and the nano silicon carbide powder size D50 is 30-100 nm.
In addition, the invention also provides a neutron absorption material which is prepared by the preparation method of the neutron absorption material.
The preparation method of the neutron absorption material provided by the invention comprises the steps of adding aluminum powder and boron carbide particles into a nano particle turbid liquid in a vacuum environment to form powder slurry, carrying out vacuum drying on the powder slurry, then carrying out pressing under a vacuum condition to obtain a blank, carrying out vacuum sintering on the blank to obtain a blank, extruding the blank into a plate, and rolling the plate to obtain the nano silicon carbide-nano aluminum oxide-boron carbide-aluminum neutron absorption material.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention or in the description of the prior art will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart illustrating steps of a method for manufacturing a neutron-absorption material according to an embodiment of the present invention;
FIG. 2 is a photograph showing the metallographic structure of the nano silicon carbide-nano alumina-boron carbide-aluminum neutron absorbing material prepared in example 1.
FIG. 3 shows a microstructure photograph of a nano-SiC-nano-alumina-boron carbide-aluminum neutron absorbing material prepared in example 1.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "horizontal", "inside", "outside", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments.
Referring to fig. 1, a method for preparing a neutron absorption material according to an embodiment of the present invention includes the following steps:
step S110: and preparing a nano particle suspension.
In some embodiments, before the step of preparing the nanoparticle suspension, the method further comprises a step of vacuum drying the aluminum powder, the boron carbide particles and the nano silicon carbide powder.
Further, the size D50 of the aluminum powder is 1-3 μm, preferably 1-1.5 μm; the boron carbide particle size D50 is < 50 μm, preferably < 10 μm; the size D50 of the nanometer silicon carbide powder is 30-100nm, preferably 30-50 nm.
It can be understood that the thickness of the nano alumina produced by the surface autoxidation of the aluminum powder is generally 2-10nm, the particle size D50 is 1-3 μm fine aluminum powder, the surface oxidation layer thereof provides 1-3 wt% of the estimated content of the nano alumina, and is a direct source of the nano alumina particle reinforced phase, in particular, when the particle size D50 of the aluminum powder is 1-1.5 μm, the content of the nano alumina provided by the surface oxidation layer thereof is more than 2 wt%; meanwhile, the large specific surface area of the fine aluminum powder in the size range is enough to inlay nano boron carbide particles with the mass fraction of 0.5-5 wt%, so that a foundation is provided for the subsequent non-intrusive mixed powder to form the nano composite powder with the shape of a 'hemp ball'.
In some embodiments, the step of preparing the nanoparticle suspension specifically includes:
adding nano silicon carbide powder into an organic solvent, and carrying out mechanical stirring and ultrasonic dispersion treatment to ensure that the nano silicon carbide particles are completely agglomerated and scattered to form a nano particle suspension; wherein: the time of the mechanical stirring and ultrasonic dispersion treatment is 1-15 min.
It can be understood that the shearing action and the cavitation effect generated by stirring and ultrasound are adopted to effectively pretreat the agglomeration in the nano silicon carbide raw material, and meanwhile, the suspension containing the nano silicon carbide particles can be directly used as a source of a solvent required for forming slurry with certain viscosity in the subsequent non-intrusive powder mixing process.
Further, the organic solvent includes ethanol.
Step S120: and adding aluminum powder and boron carbide particles into the nano particle suspension in a vacuum environment to form powder slurry.
In some embodiments, in the vacuum environment, the step of adding aluminum powder and boron carbide particles into the nanoparticle suspension to form powder slurry specifically includes:
adding aluminum powder and boron carbide particles into the suspension of the nano particles to obtain mixed slurry, placing the mixed slurry into a non-intrusive powder mixer, mixing for 2-10min under normal pressure, starting a vacuum pump to vacuumize a mixing chamber, continuously mixing for 2-5min under a vacuum environment, unloading the vacuum, stopping powder mixing, and forming powder slurry.
Further, in the mixed slurry, the mass ratio of the boron carbide particles is 5-25 wt%, preferably 10-15 wt%; the mass ratio of the nano silicon carbide particles is 0.5-5 wt%, preferably 1.5-2.5 wt%; the balance of aluminum powder; in the nano-particle suspension, the proportion relation between the powder mass and the nano-particle suspension is 1.5 g: 1 ml-2.5 g: 1 ml.
The method can be understood that a proper amount of the nano-particle suspension, fine aluminum powder and boron carbide particles form mixed powder slurry with certain viscosity, strong centrifugal force is generated by revolution, the aluminum powder and the nano-silicon carbide particles in the slurry are positioned at a far center point under the action of the centrifugal force, and viscous force is generated by autorotation, so that the aluminum powder and the nano-silicon carbide particles can overcome the centrifugal force and turn to a near center point, and the whole slurry can flow; meanwhile, because the cup has a certain angle, the pulp at the near center point is at a low position, the pulp at the far center point is at a high position, and the pulp flows in a vortex manner under the influence of the acting forces of revolution and rotation. The macroscopic sizing agent is in vortex rolling motion, the sizing agents in all areas in the container fully participate in mixing without dead angles, the microscopic sizing agent generates strong internal friction but no extrusion force between layers which move relatively, and nano particles in the solution can be effectively embedded on the surface layer of the aluminum powder and simultaneously ensure the spherical shape of the aluminum powder to be unchanged, so that the special shape of a 'hemp ball' is formed. In the dispersing process of the mixed powder, the dispersing effect depends on the motion state of the slurry, the motion state depends on the force field in the slurry, and the revolution rotating speed, the rotation rotating speed and the slurry viscosity are key parameters for determining the force field of the slurry. The vacuum pumping treatment is assisted in the later stage of mixing and dispersing, so that after the formation of a 'hemp ball-shaped' composite morphology can be effectively ensured, the alcohol solvent in the slurry is removed to form a near-dry composite powder, and the re-suspension agglomeration of nano particles in the conventional static drying of the slurry is prevented.
Further, the rotation speed during mixing is 0-3000rpm, the rotation speed is 0-2000rpm, the mixing time under normal pressure environment is 2-10min, the mixing time under vacuum environment is 2-5min, and the vacuum degree is (0.1 +/-0.05) KPa.
Step S130: and carrying out vacuum drying on the powder slurry, and then pressing under a vacuum condition to obtain a blank.
In some embodiments, the step of pressing the powder slurry under a vacuum condition after vacuum drying to obtain a blank specifically includes:
drying the powder slurry in a vacuum drying oven to further remove residual solvent; wherein: drying at 40-100 deg.C, preferably 80 deg.C for 1-12 hr, and vacuum degree of 0.1-10 Kpa.
Putting the powder after vacuum drying into a cold pressing sleeve, vacuumizing, removing air, packaging, and then putting into a cold isostatic press for pressing; wherein the cold isostatic pressing pressure is 250-400MPa, and the cold pressing time is 1-5 min.
Step S140: and sintering the blank body in vacuum to obtain the blank body.
In some embodiments, the step of vacuum sintering the blank to obtain the green body specifically includes:
and sintering the blank in vacuum at 400-600 ℃ for 2-24h to obtain the blank.
Further, the sintering temperature is preferably 420-450 ℃, and the sintering time is preferably 6-12 h.
It can be understood that most of the alumina in the blank prepared by cold isostatic pressing and vacuum sintering still maintains the spherical shell shape, and the nano silicon carbide particles are positioned in the middle of the adjacent spherical shell-shaped alumina.
Step S150: and extruding the blank into a plate, and rolling the plate to obtain the nano silicon carbide-nano aluminum oxide-boron carbide-aluminum neutron absorbing material.
In some embodiments, the step of extruding the blank into a plate and rolling the plate to obtain the nano silicon carbide-nano alumina-boron carbide-aluminum neutron absorbing material specifically includes:
and extruding the blank into a plate, and rolling the plate to a proper thickness to obtain the nano silicon carbide-nano aluminum oxide-boron carbide-aluminum neutron absorption material, wherein the extrusion temperature is 350-550 ℃, the extrusion ratio is 4: 1-16: 1, the rolling temperature is 350-550 ℃, and the single-pass deformation is 5-20%.
It can be understood that the composite material is densified, void eliminated and interface bonding enhanced during extrusion, and spherical shell-shaped nano alumina is effectively crushed and nano silicon carbide particles are further dispersed, so that the composite material with good distribution uniformity of the enhanced phase is formed; the dispersed distribution of the nano silicon carbide can further improve the room high-temperature mechanical strength of the composite material and form the composite material with high heat conductivity; in addition, because the composite material has a plurality of ceramic reinforcing phases, high-temperature strength, large extrusion resistance and extremely high requirements on extrusion equipment and dies, the process for preparing the plate with the final thickness by matching a moderate extrusion ratio with a rolling process can effectively reduce the requirements on the extrusion equipment and the extrusion dies, and has the advantage of high plate yield.
The preparation method of the neutron absorption material provided by the invention comprises the steps of adding aluminum powder and boron carbide particles into a nano particle turbid liquid in a vacuum environment to form powder slurry, carrying out vacuum drying on the powder slurry, then carrying out pressing under a vacuum condition to obtain a blank, carrying out vacuum sintering on the blank to obtain a blank, extruding the blank into a plate, and rolling the plate to obtain the nano silicon carbide-nano aluminum oxide-boron carbide-aluminum neutron absorption material.
The method for producing the neutron absorbing material of the present invention will be described below with reference to specific examples, and it will be understood by those skilled in the art that the following examples are only specific examples of the method for producing the neutron absorbing material of the present invention, and are not intended to limit the entirety thereof.
Example 1
1. Firstly, carrying out vacuum drying on a base material of fine micron aluminum powder (D50:1.5 mu m), reinforcement boron carbide particles (D50:7.3 mu m) and nano silicon carbide powder (D50:40nm) at 80 ℃ for 2 h;
2. adding 4g of nano silicon carbide powder into 100ml of alcohol solution, and carrying out mechanical stirring and ultrasonic dispersion treatment for 5min to form nano particle suspension for later use;
3. weighing 176g of dried fine aluminum powder and 20g of dried boron carbide particles, adding the weighed fine aluminum powder and the 20g of dried boron carbide particles into the suspension of the nanoparticles to form powder slurry with a certain viscosity, putting the powder slurry into a non-intrusive powder mixer for mixing, wherein the revolution speed is 2000rpm, the rotation speed is 800rpm, after mixing for 2min, starting a vacuum pump, vacuumizing a mixing chamber to vacuum (about 0.1kpa), continuously mixing for 2min, and then unloading the vacuum to stop mixing the powder;
4. taking out the mixed composite powder, placing the mixed composite powder in a vacuum drying oven for drying, and further removing the solvent; wherein the drying temperature is 80 ℃, preferably 80 ℃, and the drying time is 6 hours;
5. putting the dried powder into a cold pressing sleeve, vacuumizing, removing air, packaging, and pressing in a cold isostatic press with the cold isostatic pressing pressure of 400MPa for 2 min;
6. carrying out vacuum sintering on the cold-pressed blank, wherein the sintering temperature is 450 ℃, the sintering time is 12h, and the vacuum degree is 0.1 pa;
7. firstly, extruding a blank at the extrusion temperature of 400 ℃ in an extrusion ratio of 5.2:1, and then rolling the plate at the rolling temperature of 350 ℃, wherein the single-pass deformation is 15 percent, and the total deformation is 70 percent.
8. Thus obtaining the high-temperature, high-strength and high-heat-conductivity nano silicon carbide-nano aluminum oxide-boron carbide-aluminum neutron absorbing material.
Please refer to fig. 2 and fig. 3, which respectively show the metallographic structure photograph and the microstructure photograph of the nano silicon carbide-nano alumina-boron carbide-aluminum neutron absorbing material prepared in this example 1.
The density of the composite material of the nano silicon carbide-nano alumina-boron carbide-aluminum neutron absorption material prepared by the embodiment is 99.9%, the room temperature tensile strength is 260Mpa, the yield strength is 250Mpa, and the room temperature elongation is 5%; the tensile strength is 127Mpa at the high temperature of 350 ℃, the yield strength is 105Mpa at the high temperature of 350 ℃, the elongation is 8% at the high temperature of 350 ℃, and the thermal conductivity is 166W/m.K at the high temperature of 350 ℃.
The foregoing is considered as illustrative only of the preferred embodiments of the invention, and is presented merely for purposes of illustration and description of the principles of the invention and is not intended to limit the scope of the invention in any way. Any modifications, equivalents and improvements made within the spirit and principles of the invention and other embodiments of the invention without the creative effort of those skilled in the art are included in the protection scope of the invention based on the explanation here.
Claims (10)
1. A method for preparing a neutron absorbing material, which is characterized by comprising the following steps:
preparing a nano particle suspension;
adding aluminum powder and boron carbide particles into the nano particle suspension in a vacuum environment to form powder slurry;
carrying out vacuum drying on the powder slurry, and then pressing under a vacuum condition to obtain a blank;
sintering the blank in vacuum to obtain a blank;
and extruding the blank into a plate, and rolling the plate to obtain the nano silicon carbide-nano aluminum oxide-boron carbide-aluminum neutron absorbing material.
2. The method for preparing a neutron absorbing material according to claim 1, further comprising a step of vacuum drying the aluminum powder, the boron carbide particles, and the nano silicon carbide powder before the step of preparing the suspension of the nano particles.
3. The method for preparing a neutron-absorption material according to claim 1, wherein the step of preparing the nanoparticle suspension specifically includes:
adding nano silicon carbide powder into an organic solvent, and carrying out mechanical stirring and ultrasonic dispersion treatment to ensure that the nano silicon carbide particles are completely agglomerated and scattered to form a nano particle suspension; wherein: the time of the mechanical stirring and ultrasonic dispersion treatment is 1-15 min.
4. The method for preparing the neutron absorption material according to claim 3, wherein the step of adding aluminum powder and boron carbide particles into the nanoparticle suspension to form powder slurry in a vacuum environment specifically comprises:
adding aluminum powder and boron carbide particles into the suspension of the nano particles to obtain mixed slurry, placing the mixed slurry into a non-intrusive powder mixer, mixing for 2-10min under normal pressure, starting a vacuum pump to vacuumize a mixing chamber, continuously mixing for 2-5min under a vacuum environment, unloading the vacuum, stopping powder mixing, and forming powder slurry.
5. The method for producing the neutron absorbing material according to claim 4, wherein in the mixed slurry, the mass ratio of the boron carbide particles is 5 to 25 wt%, the mass ratio of the nano silicon carbide particles is 0.5 to 5 wt%, and the balance is aluminum powder; in the nano-particle suspension, the proportion relation between the powder mass and the nano-particle suspension is 1.5 g: 1 ml-2.5 g: 1 ml.
6. The method for preparing the neutron absorbing material according to claim 1, wherein the step of obtaining the blank by pressing the powder slurry under a vacuum condition after vacuum drying comprises:
drying the powder slurry in a vacuum drying oven; wherein: drying at 40-100 deg.C for 1-12h under vacuum degree of 0.1-10 Kpa;
putting the powder after vacuum drying into a cold pressing sleeve, vacuumizing, removing air, packaging, and then putting into a cold isostatic press for pressing; wherein the cold isostatic pressing pressure is 250-400MPa, and the cold pressing time is 1-5 min.
7. The method for preparing the neutron-absorption material according to claim 1, wherein the step of vacuum sintering the blank to obtain the green body specifically comprises:
and sintering the blank in vacuum at 400-600 ℃ for 2-24h to obtain the blank.
8. The method for preparing the neutron absorption material according to claim 1, wherein the steps of extruding the blank into a plate and rolling the plate to obtain the nano silicon carbide-nano alumina-boron carbide-aluminum neutron absorption material specifically comprise:
and extruding the blank into a plate, and rolling the plate to a proper thickness to obtain the nano silicon carbide-nano aluminum oxide-boron carbide-aluminum neutron absorption material, wherein the extrusion temperature is 350-550 ℃, the extrusion ratio is 4: 1-16: 1, the rolling temperature is 350-550 ℃, and the single-pass deformation is 5-20%.
9. The method for preparing the neutron absorption material according to claim 1, wherein the aluminum powder size D50 is 1-3 μm, the boron carbide particle size D50 is less than 50 μm, and the nano silicon carbide powder size D50 is 30-100 nm.
10. A neutron absorbing material, characterized by comprising the neutron absorbing material of any one of claims 1 to 9.
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| CN114351010A (en) * | 2021-12-31 | 2022-04-15 | 清华大学深圳国际研究生院 | Aluminum-based boron carbide composite material and preparation method and application thereof |
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| CN104498752A (en) * | 2014-11-23 | 2015-04-08 | 北京科技大学 | Preparation method of micro-nano particle reinforced aluminium matrix composite |
| CN109797309A (en) * | 2019-01-30 | 2019-05-24 | 中广核工程有限公司 | A kind of structure-function integration neutron absorber material High-Temperature Strengthening method |
| CN109825743A (en) * | 2019-03-20 | 2019-05-31 | 中国工程物理研究院材料研究所 | A kind of application method of structure-function integration neutron absorber material |
| CN109852850A (en) * | 2019-03-20 | 2019-06-07 | 中国工程物理研究院材料研究所 | A kind of preparation method of structure-function integration neutron absorber material |
| CN111304480A (en) * | 2020-04-02 | 2020-06-19 | 季华实验室 | Preparation method of nano-particle reinforced aluminum-based composite material |
| CN111593218A (en) * | 2020-05-12 | 2020-08-28 | 大连理工大学 | Micro-nano particle reinforced aluminum-based composite material and preparation method thereof |
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| CN114351010A (en) * | 2021-12-31 | 2022-04-15 | 清华大学深圳国际研究生院 | Aluminum-based boron carbide composite material and preparation method and application thereof |
| CN114351010B (en) * | 2021-12-31 | 2023-01-10 | 清华大学深圳国际研究生院 | Aluminum-based boron carbide composite material and preparation method and application thereof |
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