CN109785987A

CN109785987A - A kind of tungsten alloy particle spallation target material

Info

Publication number: CN109785987A
Application number: CN201811654310.XA
Authority: CN
Inventors: 庞立龙; 王志光; 孙建荣; 崔明焕; 台鹏飞
Original assignee: Institute of Modern Physics of CAS
Current assignee: Institute of Modern Physics of CAS
Priority date: 2018-12-29
Filing date: 2018-12-29
Publication date: 2019-05-21

Abstract

Present disclose provides a kind of tungsten alloy particle spallation target material, the tungsten alloy is tungsten nickel iron alloy, and tungsten nickel iron alloy particle is in spherical.Tungsten alloy particle spallation target material has high neutron yield, high wearability, high Flouride-resistani acid phesphatase, the impact of resistance to mechanics and the fatigability of thermal shock, outstanding calorifics and magnetic performance, processing preparation cost low etc., excellent combination property.

Description

A kind of tungsten alloy particle spallation target material

Technical field

This disclosure relates to spallation target field of material technology more particularly to a kind of tungsten alloy particle spallation target in nuclear power system Material.

Background technique

" Accelerator driven transmuting research device (ADS) " is a kind of advanced clean nuclear power system, and in December, 2015 is by state The approval project verification of the Committee of Development and Reform, family, this effectively will promote future ADS to the development in industrialization direction.Wherein, heavy metal spallation target is one The high-power spallation neutron target of kind, is component part very crucial in ADS system, and major function is generation high-energy neutron and will The heat that proton beam bombardment target material generates quickly removes.

Spallation target generally has solid metallic and liquid metal two types.In ADS, what it is due to application is high power spallation Target, and heat of reaction is needed quickly to remove, solid target is limited by the problems such as heat dissipation, and studying more is liquid metal Target (such as liquid lead bismuth alloy), it can also also serve as coolant.But there are hydrodynamic instabilities, leakage for liquid metal target Security risk and etching problem to structural material.In addition, also relating to rushing for the strong proton beam bombardment liquid target generation of high energy Hit test of the wave to structural material tolerance.These difficulties for being difficult to overcome make the development space of liquid target by very big limit System, and the particle stream target of most recently newly proposition has many advantages as high power spallation neutron target of new generation, it is this by a large amount of Prill composition fluidisation solid target, neutronics performance is good, and structural material good compatibility, and above-mentioned liquid metal is not present The problem of target, and heat removes ability and is substantially better than liquid metal target and solid target.

But requirement of the high power particle stream target to target is harsher: neutron yield wants high, mechanical performance is excellent, has Fatigability and good magnetic performance of high wearability, the impact of resistance to mechanics and thermal shock etc., further, since amount of target material is big, It must also consider the economy of target.

Currently, tungsten is the most common solid target material, multiple spallation neutron target projects all use it as target material, such as day The KENS of this high energy acclerator research institution (KEK), Chinese Dongguan spallation neutron target (100kW beam power is completed), Europe Spallation neutron target (5MW beam power, planning construction in) is all made of tungsten as target material.But pure tungsten is not particularly suited for particle stream The requirement of ADS high power particle stream spallation target is not achieved in target, heat dissipation, mechanical performance etc..

Summary of the invention

(1) technical problems to be solved

In order to solve the above problems existing in the present technology, present disclose provides a kind of tungsten alloy particle spallation target material, With high neutron yield, high wearability, high Flouride-resistani acid phesphatase, resistance to mechanics impact and thermal shock fatigability, outstanding heat Learn low with magnetic performance, processing preparation cost etc., excellent combination property.

(2) technical solution

Present disclose provides a kind of tungsten alloy particle spallation target material, the tungsten alloy is tungsten nickel iron alloy, and tungsten ferronickel closes Gold particle is in spherical.

In some embodiments of the present disclosure, in the tungsten nickel iron alloy, the content of tungsten is greater than 70%, remaining is NiFe group Knit phase.

In some embodiments of the present disclosure, the size range of spherical tungsten nickel iron alloy particle is

In some embodiments of the present disclosure, the content of tungsten is that organize the content of phase be 7% to 93%, NiFe.

In some embodiments of the present disclosure, ductility >=10% of tungsten nickel iron alloy particle, hardness >=26HRC, surrender Intensity >=800MPa, tensile strength >=950MPa, elasticity modulus >=350GPa.

(3) beneficial effect

It can be seen from the above technical proposal that the tungsten alloy particle spallation target material of the disclosure has the advantages that Excellent mechanical mechanics property, high mechanical fatigue behaviour, high neutron yield, optimal general flow and heat-exchange performance Energy, good wearability, high radiation hardness.

Detailed description of the invention

Fig. 1 shows the neutron yield of various target materials.

Fig. 2 shows the magnetic conductivity test result of 93W7 (NiFe) ball.

Fig. 3 and Fig. 4 is respectively SEM figure of the 260keV H+implantation tungsten nickel iron alloy under different irradiations at 600 DEG C.

Specific embodiment

For the purposes, technical schemes and advantages of the disclosure are more clearly understood, below in conjunction with specific embodiment, and reference The disclosure is further described in attached drawing.

One embodiment of the disclosure provides a kind of tungsten alloy particle spallation target material, and the tungsten alloy is closed using tungsten ferronickel Gold, tungsten nickel iron alloy particle is as spallation target material.According to the working condition requirement that ADS is run, pure tungsten metal is too crisp, therefore this implementation Example improves the toughness and anti-erosion performance of tungsten material using tungsten alloy.Tungsten alloy particle W content is greater than 90%, and (quality accounts for Than), remaining organizes phase for NiFe, and the tungsten alloy of the present embodiment has optimal comprehensive performance as spallation target material.

In view of particle stream spallation target actual operating mode and target ball problems faced: high temperature, intense radiation environment, What grain flowing generated wash away, impact wear, Thermal shock testing caused by hot and cold alternation, mechanics fatigue etc., this reality caused by impact The spallation target material for applying example can meet above-mentioned rigors, have the following technical effect that

1, with excellent mechanical mechanics property

Tungsten nickel iron alloy has high-tensile (700-1000MPa), high thermal conductivity coefficient (about 5 times of mould steel), low Thermal expansion coefficient (the only 1/2-1/3 of iron or steel), good electric conductivity, solderability and processability, it is at low cost the advantages that.Furthermore Tungsten nickel iron alloy is good, corrosion-free with material compatibility in reactor.The parameter of tungsten alloy bead spallation target material is as shown in table 1.

The physical mechanical parameter of 1 tungsten ferronickel particle spallation target material of table

Ingredient	Ductility	Hardness	Yield strength	Tensile strength	Elasticity modulus
						93W-7(NiFe)	>=10%	≥26HRC	≥800MPa	≥950MPa	≥350GPa

2, with high neutron yield

Fig. 1 gives the neutron yield of tungsten target Yu other various target materials, other than U and Th, W neutron with higher Yield.Therefore, tungsten material has good neutronics performance as spallation target material, can meet having for spallation target material requirements High neutron yield performance.

3, there is optimal general flow and heat exchange property

Since its deposition power density is very high when high current proton beam bombards spallation target material, the heat for needing to generate is quick It removes.Therefore, spallation target material must have preferable hot removal ability and higher mobility.Target system in CiADS device Using the tungsten alloy particle of the spheroidal of mm size as target material, tungsten alloy particle be it is spherical, having a size ofAnd pass through The movement of these tungsten alloy particles takes the heat that line deposits out of line coupled zone, can meet the quick of spallation target material requirements The performance of heat exchange.

4, with good wearability

Table 2 gives tungsten nickel iron alloy ball and specific wear rate of friction pair SIMP steel at a temperature of different experiments.In room Temperature, at 300 DEG C, the specific wear rate of the two is close, but when experimental temperature is greater than 500 DEG C, the specific wear rate of tungsten nickel iron alloy ball Significantly lower than SIMP steel.

The specific wear rate of 2 SIMP steel of table and tungsten nickel iron alloy ball (93W-7 (NiFe))

5, with good magnetic performance

For the fretting wear for reducing the bead in target cyclic process as far as possible, proposed adoption electromagnetism is promoted, therefore, the disclosure Fe, Ni element are added in bead ingredient makes bead have magnetic performance.Fig. 2 gives the magnetic conductivity test of 93W-7 (NiFe) ball Data, maximum measurement magnetic field is 10000Oe.According to the test result of the magnetic performance of tungsten nickel iron alloy, in target cyclic process Electromagnetism can be achieved to be promoted.

6, with high mechanical fatigue behaviour

Particle long-time circular flow in spallation target system promotes the height to several meters to more than ten meters by elevator, so After fall, loop back and forth like this operation.Particle target will constantly be subjected to the physical mechanicals such as collision, extruding and act on, and may cause target There is fatigue damage.Therefore, particle target must have preferable resistance to mechanics fatigue damage ability.Currently, the disclosure obtain from 200 DEG C show to the anti-pulsating stress impact fatigue experimental datas of 800 DEG C of temperature sections: after mechanics recycles million times, laboratory sample does not go out Existing damaged condition illustrates that the ability of the resistance to stress fatigue of tungsten nickel iron alloy material can meet the requirement of the following operating condition operation.

7, with high radiation hardness

Particle stream target will receive the bombardment of high current proton beam when flowing through at target section (accelerator and spallation target coupled section), Cause material internal micro-structure to change, generate irradiation damage, irradiation damage often leads to material in material internal accumulation It can deteriorate, finally cause material failure.Therefore, in order to assess the anti-radiation performance of tungsten alloy material, the disclosure has been carried out not Proton beam irradiation experiment under synthermal, different irradiations, proton beam energies 260keV, highest irradiation dose be 3 × 10¹⁷ions/cm²(be equivalent to particle stream spallation target Operation at full power be greater than 20 years deposition H amount), irradiation temperature be room temperature, 350,500 and 600 DEG C (it is 250-450 DEG C that particle stream spallation target, which runs warm area).The experimental results showed that after irradiation alloy surface without Apparent pattern variation, such as Fig. 3, Fig. 4, does not occur peeling, hardness test shows that tungsten alloy still maintains its good machine Tool mechanical property.Experimental data shows that tungsten nickel iron alloy material has extraordinary radiation hardness.

So far, attached drawing is had been combined the present embodiment is described in detail.According to above description, those skilled in the art There should be clear understanding to the nozzle for premixed combustion of the disclosure.

It should be noted that in attached drawing or specification text, the implementation for not being painted or describing is affiliated technology Form known to a person of ordinary skill in the art, is not described in detail in field.In addition, the above-mentioned definition to each element and not only limiting Various specific structures, shape or the mode mentioned in embodiment, those of ordinary skill in the art can carry out simply more it Change or replaces.

Particular embodiments described above has carried out further in detail the purpose of the disclosure, technical scheme and beneficial effects Describe in detail it is bright, it is all it should be understood that be not limited to the disclosure the foregoing is merely the specific embodiment of the disclosure Within the spirit and principle of the disclosure, any modification, equivalent substitution, improvement and etc. done should be included in the guarantor of the disclosure Within the scope of shield.

Claims

1. a kind of tungsten alloy particle spallation target material, which is characterized in that the tungsten alloy is tungsten nickel iron alloy, tungsten nickel iron alloy Grain is in spherical.

2. tungsten alloy particle spallation target material as described in claim 1, which is characterized in that in the tungsten nickel iron alloy, tungsten Atom percentage content is greater than 70%, remaining organizes phase for NiFe.

3. tungsten alloy particle spallation target material as described in claim 1, which is characterized in that the ruler of spherical tungsten nickel iron alloy particle Very little range is

4. tungsten alloy particle spallation target material as claimed in claim 2, which is characterized in that the content of tungsten is 93%, NiFe group The content for knitting phase is 7%.

5. tungsten alloy particle spallation target material as claimed in claim 4, which is characterized in that the ductility of tungsten nickel iron alloy particle >=10%, hardness >=26HRC, yield strength >=800MPa, tensile strength >=950MPa, elasticity modulus >=350GPa.