CN115505772A - Preparation method of superfine tungsten alloy material - Google Patents

Preparation method of superfine tungsten alloy material Download PDF

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CN115505772A
CN115505772A CN202211211300.5A CN202211211300A CN115505772A CN 115505772 A CN115505772 A CN 115505772A CN 202211211300 A CN202211211300 A CN 202211211300A CN 115505772 A CN115505772 A CN 115505772A
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tungsten alloy
sintering
alloy material
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CN115505772B (en
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季伟
张帅豪
傅正义
王为民
王皓
王玉成
张金咏
张帆
张清杰
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Wuhan University of Technology WUT
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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
    • C22C1/045—Alloys based on refractory metals
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C27/00—Alloys based on rhenium or a refractory metal not mentioned in groups C22C14/00 or C22C16/00
    • C22C27/04—Alloys based on tungsten or molybdenum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B12/00—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material
    • F42B12/02—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect
    • F42B12/04—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect of armour-piercing type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B12/00—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material
    • F42B12/72—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the material
    • F42B12/76—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the material of the casing

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Abstract

The invention discloses a preparation method of a superfine tungsten alloy material, which comprises the following steps: (1) Mixing 90-98 parts of tungsten metal powder and 2-10 parts of auxiliary component powder into a metal mixture, and performing ball milling for 6-30 hours in an inert gas environment to obtain tungsten alloy mixed powder with the particle size of 10 nm; (2) Putting the tungsten alloy mixed powder into a carbon fiber carburizing die, and compacting; (3) And (3) placing the die into a sintering furnace for sintering, wherein the sintering atmosphere is vacuum or inert gas, the sintering temperature is 850-1100 ℃, the heat preservation time is 5-15 min, the sintering pressure is 0.15 GPa-10 GPa, and the die is cooled to room temperature along with the furnace to obtain the superfine tungsten alloy material. The invention solves the problems of larger grain size, poor mechanical property and high sintering temperature for preparing the tungsten alloy of the prior tungsten alloy, and the superfine tungsten alloy has excellent penetrability and wide application prospect.

Description

Preparation method of superfine tungsten alloy material
Technical Field
The invention belongs to the field of alloy materials, and particularly relates to a preparation method of a superfine tungsten alloy material.
Background
For a long time, armor piercing bullets are mainly prepared from depleted uranium alloys, but the depleted uranium alloys cause serious environmental problems and health problems and are banned by numerous countries, while tungsten alloys have excellent properties of high density, high hardness, high strength, good ductility, strong corrosion resistance and the like, and are widely applied to kinetic energy armor piercing bullet materials at present.
With the continuous development of bulletproof armors in various countries, such as ceramic lightweight armor and the like, higher requirements are put on tungsten alloy armor piercing bullets. The traditional tungsten alloy prepared has high sintering temperature, larger grain size and insufficient mechanical property, and can not meet the requirements of the tungsten alloy. According to the existing theory, the strength of metal is in inverse proportion to the grain size of the material, and the fine-grained tungsten alloy has better penetrability and self-sharpening behavior, for the tungsten alloy armor piercing bullet, the bullet can crack and break in the invasion process, and the fine-grained tungsten alloy can generate self-sharpening behavior, so that the tungsten alloy armor piercing bullet has excellent penetrability. Therefore, the research on the fine-grained tungsten alloy is of great significance.
At present, fine-grained tungsten alloy is prepared by refining raw materials, adopting a new sintering technology, adding different elements and the like at home and abroad, the grain size is usually between several microns and tens of microns, and the performance improvement is very limited.
Therefore, the development of an ultrafine tungsten alloy with good mechanical properties suitable for armor piercing bullets is urgently needed.
Disclosure of Invention
The invention aims to provide a preparation method of a superfine tungsten alloy material, which solves the problems of larger grain size, poor mechanical property and high sintering temperature of the prepared tungsten alloy of the prior tungsten alloy, and the material obtained at 850 ℃ and 10GPa has the size of only 150nm, the relative density of more than 97 percent and the Vickers hardness of 1450HV.
In order to achieve the above object, the present invention provides a method for preparing an ultra-fine tungsten alloy material, the method comprising:
(1) Mixing 90-98 parts of tungsten metal powder and 2-10 parts of auxiliary component powder into a metal mixture, and performing ball milling in an inert gas environment to prepare tungsten alloy mixed powder with the average particle size of 10 nm;
(2) Putting the tungsten alloy mixed powder prepared in the step (1) into a carbon fiber carburizing die, and compacting;
(3) And (3) placing the die compacted in the step (2) into a sintering furnace for sintering, wherein the sintering atmosphere is vacuum or inert gas, the heating rate is 5-200 ℃/min, the sintering temperature is 850-1100 ℃, the heat preservation time is 5-15 min, the sintering pressure is 0.15 GPa-10 GPa, and cooling to obtain the superfine tungsten alloy material.
Preferably, the auxiliary component is selected from Co, cr, fe, ni, al, mn, mo, ti, cu, zn, WO 2 Two or more of them.
Preferably, the sintering temperature is 850 ℃; the sintering temperature rise rate is 100 ℃/min; the holding time is 5min.
Preferably, the sintering pressure is 10GPa.
Preferably, the mass of the tungsten alloy mixed powder charged into the carbon fiber carburization mold is 5 to 20g.
Preferably, the medium for ball milling is hard alloy balls; the ball milling mode is wet ball milling or dry ball milling; the mass ratio of the hard alloy balls to the metal mixture in the ball milling is (4-30): 1.
preferably, the rotation speed of the ball milling is 200-600 r/min, and the total ball milling time is 18-30 hours.
The invention provides a method for preparing the superfine tungsten alloy materialThe prepared superfine tungsten alloy material is characterized in that the dislocation density of the superfine tungsten alloy material is 1.3 multiplied by 10 17 m -2 The Vickers hardness was 1450HV.
The invention provides an application of the superfine tungsten alloy material in manufacturing a armor-piercing projectile material.
The preparation method of the superfine tungsten alloy material solves the problems of larger grain size, poor mechanical property and high sintering temperature of the prepared tungsten alloy of the prior tungsten alloy, and has the following advantages:
1. the invention can effectively reduce the sintering temperature and inhibit the grain growth by sintering under the pressure of 0.15 GPa-10 GPa, thereby realizing fine grain strengthening with the relative density of more than 97 percent.
2. The Vickers hardness of the tungsten alloy obtained by the invention is 1450HV under the sintering condition of 850 ℃ and 10GPa.
4. The invention utilizes the mechanical alloying technology to prepare the nanometer tungsten alloy mixed powder with the average grain diameter of 10nm, and the ultra-high pressure sintering technology is used to prepare the ultra-fine tungsten alloy with the grain size of only 150 nm.
5. The superfine tungsten alloy material prepared by the invention has larger relative density and smaller grain size, and has very wide application prospect.
Drawings
FIG. 1 is a flow chart of a method for preparing the ultra-fine tungsten alloy material provided by the invention.
Fig. 2 is XRD patterns of nano-tungsten alloy powders obtained in examples 1 and 5 and examples 11 to 13 of the present invention with different ball milling time periods.
FIG. 3 is a TEM image of nano-tungsten alloy powder prepared in example 6 of the present invention.
Fig. 4 is an SEM image of a cross section of the ultra-fine tungsten alloy material prepared in inventive example 6.
FIG. 5 is a TEM image of the ultrafine tungsten alloy material prepared in inventive example 6, wherein (a) a dark field image, (b) a high resolution image, and (c-d) an IFFT image.
FIG. 6 is a TEM image of a tungsten alloy prepared from the ultrafine tungsten alloy material prepared in inventive example 6) (II), in which (a) W-W interface, (b) W-WO 2 And (6) an interface.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The superfine tungsten alloy material consists of W element as main component and supplementary component selected from Co, cr, fe, ni, al, mn, mo, ti, cu, zn and WO 2 Two or more of (1).
As shown in FIG. 1, the flow chart of the preparation method of the ultrafine tungsten alloy material prepared by the invention is shown. The following embodiments are further described with reference to fig. 1.
Example 1
A method for preparing an ultrafine tungsten alloy material comprises the following steps:
(1) Respectively weighing W, ni and Fe powder, and mixing W, ni and Fe according to a mass ratio of 93:5.6:1.4, mixing to obtain a metal mixture, and preparing tungsten alloy mixed powder with the particle size of 10nm by adopting a planetary ball mill, wherein the ball milling medium is hard alloy balls, and the ball-material ratio is 4:1 (wherein, the ball milling medium is tungsten carbide grinding balls with phi of 5mm, a plurality of drops of absolute ethyl alcohol are added as a process control agent, 4:1 is the mass ratio of the hard alloy balls to the metal mixture) is ball milled in an inert gas environment (for preventing powder oxidation), the rotating speed of the planetary ball mill is 200 r/min, the total ball milling time is 18 hours, and the nano tungsten alloy powder with the average grain diameter of 10nm is prepared;
(2) And (2) filling the nano tungsten alloy powder prepared in the step (1) into a carbon fiber carburizing die, wherein the mass of the powder is 6g, and compacting.
(3) And (3) placing the compacted mould in the step (2) into a sintering furnace, wherein the sintering atmosphere is vacuum, the heating rate is 100 ℃/min, the sintering temperature is 950 ℃, the heat preservation time is 5min, and the sintering pressure is 0.15GPa. Cooling to room temperature along with the furnace to obtain the superfine tungsten alloy material (the tungsten alloy is composed of W as a main element and Ni and Fe added).
Example 2
A method for preparing an ultra-fine tungsten alloy material, which is substantially the same as in example 1, except that:
in the step (3), the heating rate is 100 ℃/min, the sintering temperature is 950 ℃, the heat preservation time is 5min, and the sintering pressure is 10GPa.
Example 3
A method for preparing an ultra-fine tungsten alloy material, which is substantially the same as in example 1, except that:
in the step (3), the heating rate is 100 ℃/min, the sintering temperature is 850 ℃, the heat preservation time is 5min, and the sintering pressure is 10GPa.
Example 4
A method for preparing an ultra-fine tungsten alloy material, which is substantially the same as in example 1, except that:
in the step (3), the heating rate is 5 ℃/min, the heat preservation time is 5min, the sintering temperature is 950 ℃, and the sintering pressure is 0.16GPa.
Example 5
A method for preparing an ultra-fine tungsten alloy material, which is substantially the same as in example 1, except that:
in step (1), the total ball milling time was 6 hours.
Example 6
A method for preparing an ultra-fine tungsten alloy material, which is substantially the same as in example 1, except that:
in the step (1), the ratio of balls to materials is 30:1 (a mixture of hard alloy balls and metal in a mass ratio of 30 to 1) is subjected to ball milling, the rotating speed of a planetary ball mill is 300 revolutions per minute, and the total ball milling time is 30 hours;
in the step (3), the temperature is raised at 20 ℃/min when the temperature is 0-800 ℃, the temperature is raised at 5 ℃/min when the temperature is 800-950 ℃, the sintering temperature is 950 ℃, the heat preservation time is 5min, and the sintering pressure is 1.6GPa.
Example 7
A method for preparing an ultrafine tungsten alloy material comprises the following steps:
(1) Respectively weighing W, ni, fe and WO 2 Powder of W, ni, fe and WO 2 According to the mass ratio of 90:3:2:1, mixing to obtain a metal mixture, and preparing tungsten alloy mixed powder with the particle size of 10nm by adopting a planetary ball mill, wherein a ball milling medium is a hard alloy ball, and the ball-material ratio is 10:1 (the mass ratio of the hard alloy balls to the metal mixture is 10.
(2) And (2) filling the tungsten alloy mixed powder with the particle size of 10nm prepared in the step (1) into a carbon fiber carburizing die, wherein the mass of the powder is 20g, and compacting.
(3) And (3) placing the compacted mould in the step (2) into a sintering furnace, wherein the sintering atmosphere is vacuum. The heating rate is 1000 ℃/min, and the sintering pressure is 10GPa. The heat preservation time is 5min, and the sintering temperature is 850 ℃. Cooling to room temperature to obtain the superfine tungsten alloy material (the tungsten alloy takes W as the main element and Ni, fe and WO are added 2 Three components).
Example 8
A method of preparing an ultra-fine tungsten alloy material, substantially the same as in example 7, except that:
in step (1), the total ball milling time was 18 hours.
Example 9
A method for preparing an ultrafine tungsten alloy material comprises the following steps:
(1) Respectively weighing W, ni and Cu powder, and mixing W, ni and Cu according to a mass ratio of 95:3.5:1.5, mixing to obtain a metal mixture, and preparing tungsten alloy mixed powder with the particle size of 10nm by adopting a planetary ball mill, wherein the ball milling medium is hard alloy balls, and the ball-material ratio is 10:1 (the mass ratio of the hard alloy balls to the metal mixture is 10.
(2) And (2) filling the tungsten alloy mixed powder with the particle size of 10nm prepared in the step (1) into a carbon fiber carburizing die, wherein the mass of the powder is 20g, and compacting.
(3) And (3) placing the compacted die in the step (2) into a sintering furnace, wherein the sintering atmosphere is inert gas. The heating rate is 200 ℃/min, and the sintering pressure is 0.2GPa. The heat preservation time is 5min, and the sintering temperature is 1100 ℃. Cooling to room temperature along with the furnace to obtain the ultrafine tungsten alloy material (the tungsten alloy is composed of W as a main element and Ni and Cu which are added).
Example 10
A method of preparing an ultra-fine tungsten alloy material, substantially as described in example 8, with the following exceptions: in step (3), the sintering pressure is changed from 0.2GPa to 0.05GPa.
Example 11
A method for preparing an ultra-fine tungsten alloy material, which is substantially the same as in example 1, except that:
in step (1), the total ball milling time was 12 hours.
Example 12
A method for preparing an ultra-fine tungsten alloy material, which is substantially the same as in example 1, except that:
in step (1), the total ball milling time was 24 hours.
Example 13
A method for preparing an ultra-fine tungsten alloy material, which is substantially the same as in example 1, except that:
in step (1), the total ball milling time was 30 hours.
Experimental example 1 Performance test
1. Duration of ball milling
The nano-sized tungsten alloy mixed powder prepared in the different ball milling times of the examples 1, 5 and 11 to 13 of the present invention was characterized.
As shown in fig. 2, XRD patterns of nano-tungsten alloy powders obtained in example 1, example 5 and examples 11 to 13 of the present invention with different ball milling time periods. It can be clearly seen from fig. 2 that when the ball milling time is 6h, ni and Fe peaks exist, and gradually decrease with the increase of the ball milling time, and when the ball milling time reaches 18h, the Ni and Fe peaks disappear, which indicates that the Ni and Fe are completely dissolved into the W lattice, and when the ball milling time continues to be prolonged, the peak position does not change any more, which indicates that the pre-alloying is completed, which provides a favorable condition for sintering.
2. Particle size of tungsten alloy
The nano-scale tungsten alloy mixed powder prepared in the embodiment 6 of the invention is analyzed by an electron microscope.
As shown in fig. 3, TEM images of the nano-tungsten alloy powder prepared in example 6 of the present invention are shown, wherein (a) a TEM image with a scale of 100nm, (b) an enlarged image of a block in (a) with a scale of 10nm, and (c) an enlarged image of a block in (b) with a scale of 5nm. From FIG. 3 (b), it can be observed that particles with a grain size of about 10nm exist in the powder, and the larger particles are formed by agglomeration of small particles; it can be seen from fig. 3 (c) that there are a large number of amorphous regions in the powder, which are caused by mechanical alloying for a long time, and the small crystal grain size and the large lattice distortion can effectively activate the lattice, which is beneficial to the proceeding of the subsequent sintering.
3. The ultrafine tungsten alloy material prepared in inventive example 6 was subjected to electron microscope analysis.
As shown in fig. 4, SEM of the cross section of the ultra-fine tungsten alloy material prepared in inventive example 6. It can be known from fig. 4 that the ultra-high pressure sintering technology of the present invention prepares the ultra-fine tungsten alloy with the grain size of only 150nm, and there is a significant liquid phase between the particles and on the particle surface, because the ultra-high pressure sintering has a slower temperature rise rate, so there is a longer time to form a sufficient liquid phase, and there is also a sufficient time to fill the gaps between the particles, which also indicates that the tungsten alloy has a higher relative density, and the liquid phase on the particle surface indicates that the fracture mode between the particles is mostly tearing of the binder phase, and it proves that the strength of the solid-phase mass transfer connection is higher, because the higher pressure can make the rigid tungsten particles plastically deform, so there is a larger contact surface, the higher rate of the diffusion mass transfer occurs, and the sintering neck is more easily formed, which is beneficial to the progress of sintering and the strengthening of the interface strength, so this fracture mode is mostly tearing of the binder phase.
As shown in fig. 5, TEM image (a) of the ultrafine tungsten alloy material prepared in inventive example 6 is a dark field image, (b) a high resolution image, (c-d) IFFT image, and (W), (Ni), (Fe), and (O) are element distribution maps of W, ni, fe, and O in this order. Calculated from FIG. 5Ultra-high pressure introduces a density of up to 1.3X 10 17 m -2 The dislocation of the nano-crystal stimulates a dislocation strengthening mechanism and simultaneously generates nano WO in situ in the sintering process 2 The dispersion strengthening phase excites the dispersion strengthening mechanism of the nano hard phase, and the pressure can improve the dislocation density, thereby achieving the purpose of strengthening the mechanical property. Further, since the small regions having dislocations and the matrix grains no longer have the same structure due to the high dislocation density, it is considered that a new phase is precipitated from the matrix, and precipitation hardening occurs due to the formation of a second phase of a nanometer order. From EDS elemental analysis images, it can be seen that there are enriched regions of various elements in the tungsten alloy, and the W element is mainly W, WO 2 Ni and Fe are enriched to form a gamma- (Ni, fe, W) binding phase; the oxygen element is mainly WO 2 。
As shown in FIG. 6, TEM image of tungsten alloy prepared from ultrafine tungsten alloy material prepared in inventive example 6) (II) wherein (a) W-W interface, (b) W-WO 2 And (6) an interface. As shown in fig. 6, in the interface of the ultra-high pressure tungsten alloy, it can be seen that the interface of the W — W crystal grains is connected by diffusion, and a part of the fine fringes are present on the interface, and the moire fringes generated by the interference of the lattice fringes of the two phases at a specific angle and position are analyzed, and other phenomena are not found. In W-WO 2 There is a distinct transition layer due to a new phase formed by diffusion of oxygen atoms into the W grains.
4. The relative density of the superfine tungsten alloy material prepared by the invention is tested.
The ultra-fine tungsten alloy materials prepared in examples 1 to 13 were ground and polished, and then boiled in deionized water for 2 hours or more to sufficiently remove gas in open pores of the materials, followed by measurement of relative density by archimedes drainage.
The results show that the relative density of the ultra-fine tungsten alloys prepared in examples 1 to 13 all reached 97% or more, and that the relative density of 97% or more is less than 3% of the pores present in the material. The invention can effectively reduce the sintering temperature and inhibit the grain growth by sintering under the pressure of 0.15 GPa-10 GPa, thereby realizing fine grain strengthening, and the relative density is more than 97 percent.
5. The hardness of the superfine tungsten alloy material prepared by the invention is tested.
The hardness testing equipment is a wolpert430SVD Vickers hardness tester. The instrument can automatically complete measurement after selecting a measurement point. The measurement temperature was 25 ℃, the material mass was 3.8g, the material thickness was 2.0mm, 5 points were uniformly selected from the center to the edge of the polished surface of the material for measurement, and the average value thereof was calculated. When the hardness test is carried out, the test pressure is 1KgF, the pressure maintaining time is 15s, after the pressure maintaining is finished, the microscope is adjusted until the test area is clearly visible, and the diagonal length of the indentation is measured. Test results, as shown in table 1:
Figure BDA0003875329930000081
Figure BDA0003875329930000091
from table 1, it is clear that the vickers hardnesses of the tungsten alloys prepared in examples 2 and 6 were 1390HV and 1350HV, respectively, while the vickers hardnesses of the ultra-fine tungsten alloys prepared in example 3 (850 ℃, 10 GPa) were as high as 1450HV. The results of table 1 were analyzed to give: the ball milling time is prolonged, so that the raw material powder with smaller grain size can be obtained, and the tungsten alloy with better performance can be obtained; the proper heating rate is also beneficial to preparing the fine-grained tungsten alloy, the sintering time can be prolonged due to the lower heating rate, the crystal grains grow, and a larger temperature gradient can be generated due to the high heating rate, so that the sintering is not beneficial; the pressure and temperature are crucial to sintering, and the high pressure can provide additional driving force for sintering densification, so that the sintering temperature can be obviously reduced, the grain growth is inhibited, and the fine-grained tungsten alloy material can be obtained more favorably.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.

Claims (8)

1. A preparation method of an ultrafine tungsten alloy material is characterized by comprising the following steps:
(1) Mixing 90-98 parts of tungsten metal powder and 2-10 parts of auxiliary component powder into a metal mixture, and performing ball milling for 6-30 hours in an inert gas environment to obtain tungsten alloy mixed powder with the average particle size of 10 nm;
(2) Putting the tungsten alloy mixed powder prepared in the step (1) into a carbon fiber carburizing die, and compacting;
(3) Placing the die compacted in the step (2) into a sintering furnace for sintering, wherein the sintering atmosphere is vacuum or inert gas, the heating rate is 5-200 ℃/min, the sintering temperature is 850-1100 ℃, the heat preservation time is 5-15 min, the sintering pressure is 0.15 GPa-10 GPa, and cooling to obtain the superfine tungsten alloy material;
the auxiliary component is selected from Co, cr, fe, ni, al, mn, mo, ti, cu, zn and WO 2 Two or more of them.
2. The method for preparing the ultrafine tungsten alloy material according to claim 1, wherein the sintering temperature rise rate is 20 ℃/min, the sintering temperature is 850 ℃, and the holding time is 5min.
3. The method of claim 1, wherein the sintering pressure is 10GPa.
4. The method of claim 1, wherein the tungsten alloy powder mixture loaded into the carbon fiber carburization mold has a mass of 5 to 20g.
5. The method for preparing the ultrafine tungsten alloy material according to claim 1, wherein the medium for ball milling is cemented carbide balls; the ball milling mode is wet ball milling or dry ball milling; the mass ratio of the hard alloy balls to the metal mixture in the ball milling is (4-30): 1.
6. the method for preparing the ultrafine tungsten alloy material according to claim 1, wherein the rotation speed of ball milling is 200 to 600r/min, and the total ball milling time is 18 to 30 hours.
7. An ultra-fine tungsten alloy material prepared by the method of any one of claims 1 to 6, wherein the ultra-fine tungsten alloy material has a dislocation density of 1.3 x 10 17 m -2 The Vickers hardness was 1450HV.
8. Use of the ultra-fine tungsten alloy material of claim 7 in the manufacture of a armor-piercing bullet material.
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CN101880808A (en) * 2010-08-11 2010-11-10 北京科技大学 Method for preparing nano oxide dispersion reinforced superfine crystal tungsten-based composite material
KR20170131402A (en) * 2015-03-23 2017-11-29 미쓰비시 마테리알 가부시키가이샤 Polycrystalline tungsten, tungsten alloy sintered compact, and method for manufacturing same
CN110273093A (en) * 2019-06-12 2019-09-24 北京大学 A kind of nanocrystalline tungsten alloy and preparation method thereof
CN111020329A (en) * 2019-11-22 2020-04-17 武汉理工大学 Method for preparing porous tungsten material based on W-Fe-C system corrosion method

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