CN108277338B - System and method for preparing negative resistivity current coefficient material - Google Patents
System and method for preparing negative resistivity current coefficient material Download PDFInfo
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- CN108277338B CN108277338B CN201810029771.1A CN201810029771A CN108277338B CN 108277338 B CN108277338 B CN 108277338B CN 201810029771 A CN201810029771 A CN 201810029771A CN 108277338 B CN108277338 B CN 108277338B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/04—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having negative temperature coefficient
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Abstract
The invention provides a method for preparing a negative resistivity current coefficient material, which comprises the following steps: s100, obtaining a mapping relation between a target negative resistivity current coefficient of a material to be prepared and the irradiation damage fluence; s200, placing a material to be prepared into an irradiation device, and irradiating the material to be prepared by utilizing neutrons, heavy ions or proton sources; s300, according to the mapping relation, forming the resistance material with the target negative resistivity current coefficient by the material to be prepared by controlling the irradiation damage fluence of the material to be prepared. The invention prepares the resistance material with the physical characteristics of negative resistivity and current coefficient, which has stable performance and better service life and reliability by irradiating the low-alloy steel with low cost.
Description
Technical Field
The invention relates to the technical field of materials, in particular to a system and a method for preparing a material with negative resistivity and current coefficient
Background
The resistance material with the physical characteristic of negative resistivity and current coefficient has wide application and requirements in the fields of aerospace, high-end electronic equipment, information storage (RRAM), high-end acoustic impedance components, high-end industrial instrument equipment (NTC) and the like.
At present, most of materials with the physical characteristics of negative resistivity and current coefficient are precious rare metal alloys, and the preparation process is very complex, the cost is high, and the defects of unstable performance, poor service life reliability and the like exist. At present, most of materials with the physical characteristics of negative resistivity and current coefficient are made of rare metal alloy materials by adopting the technical principle of preparing functional materials.
The raw materials of the preparation method are rare metals, are expensive and are not beneficial to industrial mass popularization and application. The preparation process is complex, the cost is high, and the defects of unstable performance, poor service life reliability and the like exist.
Disclosure of Invention
Aiming at the technical problems, the invention provides a preparation method of a physical characteristic material with negative resistivity and current coefficient, which has the advantages of wide raw material source, simple preparation process and stable performance.
The technical solution of the present invention for solving the above technical problems is to provide a method for preparing a negative resistivity current coefficient material, comprising the steps of:
s100, obtaining a mapping relation between a target negative resistivity current coefficient of a material to be prepared and the irradiation damage fluence;
s200, placing a material to be prepared into an irradiation device, and irradiating the material to be prepared by utilizing neutrons, heavy ions or proton sources;
s300, according to the mapping relation, forming the resistance material with the target negative resistivity current coefficient by the material to be prepared by controlling the irradiation damage fluence of the material to be prepared.
Optionally, the mapping is that the target negative resistivity current coefficient of the material to be prepared increases with the irradiation damage fluence.
Optionally, the material to be prepared is a low alloy steel.
Optionally, the material to be prepared is irradiated by selecting a neutron, a heavy ion or a proton source according to the thickness of the material to be prepared.
Optionally, the step S100 includes the following steps:
s110, measuring a negative resistivity current coefficient of a material to be prepared;
s120, placing the material to be prepared into the irradiation device, and irradiating the material to be prepared by utilizing neutrons, heavy ions or proton sources;
s130, calculating the irradiation damage fluence of the material to be prepared according to the actual energy spectrum of the irradiation device and the accumulated neutron fluence of the material to be prepared in the irradiation process;
s140, taking the material to be prepared out of the irradiation device, and measuring the negative resistivity current coefficient of the material to be prepared;
s150, repeating the steps S110-S140 to obtain the mapping relation.
The invention also provides a system for preparing the material with negative resistivity and current coefficient, which comprises the following steps:
the mapping module is used for acquiring the mapping relation between the target negative resistivity current coefficient of the material to be prepared and the irradiation damage fluence;
the irradiation device is used for placing a material to be prepared and irradiating the material to be prepared by utilizing neutrons, heavy ions or proton sources;
and the control module is connected with the mapping module and the irradiation device and used for controlling the irradiation damage fluence of the material to be prepared according to the mapping relation so as to enable the material to be prepared to form a resistance material with a target negative resistivity current coefficient.
Optionally, the mapping is that the target negative resistivity current coefficient of the material to be prepared increases with the irradiation damage fluence.
Optionally, the material to be prepared is a low alloy steel.
Optionally, the material to be prepared is irradiated by selecting a neutron, a heavy ion or a proton source according to the thickness of the material to be prepared.
Optionally, the mapping relationship is obtained by:
s110, measuring a negative resistivity current coefficient of a material to be prepared;
s120, placing the material to be prepared into the irradiation device (200), and irradiating the material to be prepared by utilizing neutrons, heavy ions or proton sources;
s130, calculating the irradiation damage fluence of the material to be prepared according to the actual energy spectrum of the irradiation device (200) and the accumulated neutron fluence of the material to be prepared in the irradiation process;
s140, taking the material to be prepared out of the irradiation device (200), and measuring the negative resistivity current coefficient of the material to be prepared;
s150, repeating the steps S110-S140 to obtain the mapping relation.
The invention prepares the resistance material with stable performance, better service life and reliability and the physical characteristic of negative resistivity and current coefficient by irradiating the low-alloy steel material with low cost.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a diagram of the main steps of the method for preparing a material with negative resistivity and current coefficient according to the present invention;
FIG. 2 is a diagram of a step S100 of a method for preparing a material with negative resistivity and current coefficient according to the present invention;
FIG. 3 is a block diagram of a system for preparing a material with negative resistivity and current coefficient according to the present invention;
FIG. 4 is a curve of resistivity with load current after irradiation of the low alloy steel provided by the present invention.
Detailed Description
In order that those skilled in the art will more clearly understand the present invention, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, a method for preparing a negative resistivity current coefficient material includes the following steps:
s100, obtaining a mapping relation between a target negative resistivity current coefficient of a material to be prepared and the irradiation damage fluence;
s200, placing a material to be prepared into an irradiation device, and irradiating the material to be prepared by utilizing neutrons, heavy ions or proton sources;
s300, according to the mapping relation, forming the resistance material with the target negative resistivity current coefficient by the material to be prepared by controlling the irradiation damage fluence of the material to be prepared.
Each step will be explained in detail in steps below.
S100, obtaining a mapping relation between a target negative resistivity current coefficient of a material to be prepared and the irradiation damage fluence;
as shown in fig. 2, the step S100 includes the steps of:
s110, measuring a negative resistivity current coefficient of a material to be prepared;
wherein, the material to be prepared can be manganese-nickel-molybdenum series low alloy steel, and the main element chemical compositions (mass percent) are as follows: manganese: 1.15-1.60%; nickel: 0.50-0.80%; molybdenum: 0.43-0.57%, and the balance of iron.
S120, placing the material to be prepared into the irradiation device, and irradiating the material to be prepared by utilizing neutrons, heavy ions or proton sources;
the irradiation is carried out at the temperature of 565K, the low alloy steel is irradiated by adopting one method of neutron irradiation, heavy ion irradiation or proton irradiation, and the micro-texture of the material is changed by irradiation to realize special electrical properties, namely the irradiated material has the physical characteristic of negative resistivity current coefficient.
S130, calculating the irradiation damage fluence of the material to be prepared according to the actual energy spectrum of the irradiation device and the accumulated neutron fluence of the material to be prepared in the irradiation process;
and calculating the irradiation damage fluence of the low alloy steel sample by using MCNP-4C and BISON programs according to the actual energy spectrum of the irradiation device and the accumulated neutron fluence of the sample in the irradiation process.
S140, taking the material to be prepared out of the irradiation device, and measuring the negative resistivity current coefficient of the material to be prepared;
s150, repeating the steps S110-S140 to obtain the mapping relation.
The irradiation damage fluence is used to characterize the irradiation degree, and depends on the irradiation time and the size of the irradiation source. The irradiation damage fluence affects the magnitude of the "negative resistivity current coefficient" of a resistive material having a target negative resistivity current coefficient (hereinafter referred to as "resistive material"). The mapping relation is as follows: the larger the irradiation degree is, the larger the "negative resistivity current coefficient" of the irradiated resistance material is, and the more remarkable the physical property is, that is, the larger the irradiation damage fluence is, the larger the "negative resistivity current coefficient" of the irradiated resistance material is, and the more remarkable the physical property is.
S200, placing a material to be prepared into an irradiation device, and irradiating the material to be prepared by utilizing neutrons, heavy ions or proton sources;
the preparation cost of neutron irradiation, heavy ion irradiation and proton irradiation is reduced in sequence, but the maximum section thickness of the resistance material which can be prepared is correspondingly reduced, and a specific irradiation mode can be selected according to the size requirement of the section thickness of the resistance material (hereinafter referred to as resistance material) with a target negative resistivity current coefficient in practice.
The section thickness of the resistance material prepared by neutron irradiation is not limited; the maximum cross-sectional thickness of the resistance material prepared by heavy ion irradiation is 50 microns, and understandably, if a double-sided heavy ion irradiation mode is adopted, the maximum cross-sectional thickness is 100 microns; the maximum cross-sectional thickness of the resistive material prepared by proton irradiation is 5 microns, and the maximum cross-sectional thickness is 10 microns if double-sided proton irradiation is adopted.
S300, according to the mapping relation, forming the resistance material with the target negative resistivity current coefficient by the material to be prepared by controlling the irradiation damage fluence of the material to be prepared.
The mapping relation can be expressed by graphs, tables, functions and the like, a target negative resistivity current coefficient is selected according to actual needs, then corresponding irradiation damage fluence is found through the mapping relation according to the target negative resistivity current coefficient, the size and the time length of an irradiation device and an irradiation source are determined, and the required resistance material with the target negative resistivity current coefficient is prepared.
As shown in fig. 3, the present invention also includes a system for preparing a material having a negative resistivity-current coefficient, comprising: the mapping module 100 is used for obtaining a mapping relation between a target negative resistivity current coefficient of a material to be prepared and the irradiation damage fluence; the irradiation device 200 is used for placing a material to be prepared and irradiating the material to be prepared by utilizing neutrons, heavy ions or proton sources; and the control module 300 is connected with the mapping module 100 and the irradiation device 200 and is used for controlling the irradiation damage fluence of the material to be prepared according to the mapping relation so as to enable the material to be prepared to form a resistance material with a target negative resistivity current coefficient. The mapping relation is that the target negative resistivity current coefficient of the material to be prepared increases along with the increase of the irradiation damage fluence. The material to be prepared is low alloy steel. And irradiating the material to be prepared by using neutrons, heavy ions or proton sources according to the thickness of the material to be prepared.
The mapping relation is obtained by the following steps:
s110, measuring a negative resistivity current coefficient of a material to be prepared;
s120, placing the material to be prepared into the irradiation device 200, and irradiating the material to be prepared by utilizing neutrons, heavy ions or proton sources;
s130, calculating the irradiation damage fluence of the material to be prepared according to the actual energy spectrum of the irradiation device 200 and the accumulated neutron fluence of the material to be prepared in the irradiation process;
s140, taking the material to be prepared out of the irradiation device 200, and measuring the negative resistivity current coefficient of the material to be prepared;
s150, repeating the steps S110-S140 to obtain the mapping relation.
The invention prepares the resistance material with the physical characteristics of negative resistivity and current coefficient, which has stable performance and better service life and reliability by irradiating the low-alloy steel with low cost.
Examples
The low alloy steel sample used in this example was manganese-nickel-molybdenum low alloy steel; the chemical composition of the steel is shown in table 1 and the heat treatment process used is shown in table 2.
TABLE 1 chemical composition (wt%) of low alloy steel for a certain furnace number
TABLE 2 Heat treatment conditions for Low alloy steels
| Temperature/. degree.C | Time per hour | Heating Rate/. degree.C./hr | Cooling method | |
| Normalizing | 920±10 | 5 | ≤30 | Natural cooling |
| Quenching | 820±10 | 5 | ≤50 | Water cooling |
| Tempering | 650±10 | 10 | ≤60 | Natural cooling |
This example is a nuclear pilot in-pile test, which subjects a sample of low alloy steel to accelerated neutron irradiation. Calculating the radiant flux of the low alloy steel sample by using MCNP-4C and BISON programs according to the actual energy spectrum of the nuclear experimental reactor and the accumulated neutron fluence of the sample in the irradiation process: 0.0409dpa, 0.0798dpa, 0.116dpa and 0.154 dpa. The resistivity (p) of the RPV steel before and after irradiation was measured using a PPMS-9EC II comprehensive performance testing system (Quantum Design, Inc.).
In this example, the resistivity of a low alloy steel sample was measured by a four-probe method. The dimensions of the low alloy steel samples were 1mm x 6 mm. An alternating current of 17Hz was used as the loading current. Loading currents of 0.2mA, 2mA, 20mA and 200mA were used during the test. Each loading current collected no less than 5 valid data sets, with the interval between two consecutive measurements being no less than 30 s.
Taking the experimental result of the present embodiment when the irradiation damage fluence is 0.154dpa as an example, when the irradiation damage fluence is 0.154dpa, the resistivity of the resistor decreases by as much as 80% when the loading current of the resistor increases from 0.2mA to 200mA after irradiation, and the variation curve of the resistivity (ρ) with the loading current is shown in fig. 4. As can be seen from fig. 4, the irradiation damage fluence affects the magnitude of the "negative resistivity current coefficient" of the resistance material, and the larger the irradiation degree is, the larger the "negative resistivity current coefficient" of the resistance material after irradiation is, the more significant the physical property is, i.e., the larger the irradiation damage fluence is, the larger the "negative resistivity current coefficient" of the resistance material after irradiation is, the more significant the physical property is.
In conclusion, the low-alloy steel with low cost is irradiated to prepare the resistance material with stable performance, good service life and reliability and the physical characteristic of negative resistivity and current coefficient.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (3)
1. A system for preparing a negative resistivity material having a current coefficient of resistivity, comprising:
the mapping module (100) is used for acquiring the mapping relation between the target negative resistivity current coefficient of the material to be prepared and the irradiation damage fluence;
the irradiation device (200) is used for placing a material to be prepared, irradiating the material to be prepared by utilizing a heavy ion or proton source at the temperature of 565K, wherein the material to be prepared is manganese-nickel-molybdenum series low alloy steel, and the mass percent is as follows: manganese: 1.15 percent; nickel: 0.50 percent; molybdenum: 0.43 percent, and the balance of iron;
the control module (300) is connected with the mapping module (100) and the irradiation device (200) and is used for controlling the irradiation damage fluence of the material to be prepared according to the mapping relation so as to enable the material to be prepared to form a resistance material with a target negative resistivity current coefficient; the mapping relation is expressed by a graph, a table or a function;
and according to the thickness of the material to be prepared, selecting and utilizing a heavy ion or proton source to irradiate the material to be prepared.
2. The system of claim 1, wherein the mapping is such that a target negative resistivity-current coefficient of the material to be produced increases with increasing fluence of the irradiation damage.
3. The system of claim 1, wherein the mapping is obtained by:
s110, measuring a negative resistivity current coefficient of a material to be prepared;
s120, placing the material to be prepared into the irradiation device (200), and irradiating the material to be prepared by utilizing a heavy ion or proton source;
s130, calculating the irradiation damage fluence of the material to be prepared according to the actual energy spectrum of the irradiation device (200) and the accumulated neutron fluence of the material to be prepared in the irradiation process;
s140, taking the material to be prepared out of the irradiation device (200), and measuring the negative resistivity current coefficient of the material to be prepared;
s150, repeating the steps S110-S140 to obtain the mapping relation.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101740715A (en) * | 2009-12-04 | 2010-06-16 | 中国科学院近代物理研究所 | Method for improving and modulating magnetoresistance of semi-metallic thin film materials by high-energy heavy ion irradiation |
| CN101908486A (en) * | 2009-06-08 | 2010-12-08 | 刘有 | Novel process for applying neutron transmutation doping transverse magnetic field czochralski silicon to high-power semiconductor device |
| CN102097579A (en) * | 2009-09-08 | 2011-06-15 | 通用汽车环球科技运作公司 | Method for enhancing the performance of thermoelectric materials by irradiation-processing |
| CN106128528A (en) * | 2016-07-28 | 2016-11-16 | 中广核工程有限公司 | A kind of method and apparatus monitoring nuclear power plant reactor pressure vessel irradiation damage |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101908486A (en) * | 2009-06-08 | 2010-12-08 | 刘有 | Novel process for applying neutron transmutation doping transverse magnetic field czochralski silicon to high-power semiconductor device |
| CN102097579A (en) * | 2009-09-08 | 2011-06-15 | 通用汽车环球科技运作公司 | Method for enhancing the performance of thermoelectric materials by irradiation-processing |
| CN101740715A (en) * | 2009-12-04 | 2010-06-16 | 中国科学院近代物理研究所 | Method for improving and modulating magnetoresistance of semi-metallic thin film materials by high-energy heavy ion irradiation |
| CN106128528A (en) * | 2016-07-28 | 2016-11-16 | 中广核工程有限公司 | A kind of method and apparatus monitoring nuclear power plant reactor pressure vessel irradiation damage |
Non-Patent Citations (1)
| Title |
|---|
| Effects of neutron irradiation on resistivity of reactor pressure vessel;Chengliang Li等;《Journal of Nuclear Materials》;20171208;第499卷;446-450 * |
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