CN112719262B - Tungsten alloy granulating material for high-speed pressing and preparation method thereof - Google Patents
Tungsten alloy granulating material for high-speed pressing and preparation method thereof Download PDFInfo
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- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
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- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
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- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
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- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
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- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/1003—Use of special medium during sintering, e.g. sintering aid
- B22F3/1007—Atmosphere
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- B22F9/00—Making metallic powder or suspensions thereof
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- B22F9/026—Spray drying of solutions or suspensions
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- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
- B22F2009/043—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by ball milling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2201/00—Treatment under specific atmosphere
- B22F2201/01—Reducing atmosphere
- B22F2201/013—Hydrogen
Abstract
The application relates to the field of tungsten alloy, and particularly discloses tungsten alloy granulating materials for high-speed pressing and a preparation method thereof. The tungsten alloy granulating material for high-speed pressing comprises, by weight, 98-99% of tungsten alloy powder, 0.5-1.5% of a forming agent A and 0.5-1% of a forming agent B, wherein the forming agent A is a mixture of PVA and PEG, and the forming agent B is a mixture of at least two of stearic acid, stearate, amides and PVA; the preparation method comprises the following steps: s1, mixing tungsten alloy powder, a forming agent A and deionized water, and then performing ball milling for 2-24 hours to obtain tungsten alloy slurry, wherein the ball-to-material ratio during ball milling is (1-3): 1; s2, carrying out spray granulation on the tungsten alloy slurry to obtain tungsten alloy granulated powder, and uniformly mixing the tungsten alloy granulated powder with the forming agent B to obtain the tungsten alloy granulated material for high-speed pressing. The tungsten alloy granulated material for high-speed pressing can be used for manufacturing balance weight original pieces of smart phones and watches, and can solve the problems of die sticking and uneven density during pressing of the existing tungsten alloy granulated powder.
Description
Technical Field
The application relates to the field of tungsten alloys, in particular to a tungsten alloy granulating material for high-speed pressing and a preparation method thereof.
Background
The tungsten alloy has the characteristics of high specific gravity, high strength, high hardness and small expansion coefficient, and has good corrosion resistance and oxidation resistance, so that the tungsten alloy is widely applied to counterweight elements of smart phones and watches.
The tungsten alloy has a high melting point, and the tungsten alloy counterweight original is generally prepared by a powder metallurgy technology, and the main process route is that raw materials such as tungsten, iron and nickel are mechanically mixed and then are put into a die, and are pressed and formed on a powder forming press or a cold isostatic press, and then the required tungsten alloy product is obtained through liquid-phase activation sintering.
The tungsten alloy powder for press forming is granulated powder, the tungsten alloy powder and a forming agent are ball-milled in a ball mill to obtain slurry, and the slurry is spray-dried to obtain the granulated powder. The selection of the forming agent is important, when the forming agent is not selected properly, the problem of uneven density of a green body is easy to occur when the green body is pressed, so that the problem of uneven density of a tungsten alloy sintered part is also caused, density lines exist on the tungsten alloy sintered part, and the tungsten alloy sintered part is unqualified, so that the preparation method of the existing tungsten alloy granulated powder needs to be further improved.
Disclosure of Invention
In order to solve the problem of uneven density of tungsten alloy sintered parts, the application provides a tungsten alloy granulating material for high-speed pressing and a preparation method thereof.
In a first aspect, the present application provides a tungsten alloy granulated material for high-speed pressing, which adopts the following technical scheme:
the tungsten alloy granulating material for high-speed pressing comprises, by weight, 98-99% of tungsten alloy powder, 0.5-1.5% of a forming agent A and 0.5-1% of a forming agent B, wherein the forming agent A is a mixture of PVA and PEG, and the forming agent B is a mixture of at least two of stearic acid, stearate, amides and PVA.
By adopting the technical scheme, the forming agent A and the forming agent B are used as forming agents, the PVA and the PEG in the forming agent A can increase the viscosity of the tungsten alloy sintering piece, the density of the tungsten alloy sintering piece is improved, the PEG and the PVA interact, the molecular motion capability of raw materials is improved, the tungsten alloy powder is dispersed more uniformly, but the PVA has poor thermal stability, a pressed product becomes brittle and the forming agent A fails at high temperature, the forming agent B can form hydrogen bonds with hydroxyl groups of the forming agent A, the thermal stability of the forming agent A is improved, the forming agent B has a lubricating effect, the problem of mucosa during pressing of tungsten alloy granulated powder can be solved, the forming agent B and the forming agent A cooperate and are mutually crosslinked, the uniformity of the raw material distribution of the tungsten alloy sintering piece is further improved, the density uniformity of the tungsten alloy sintering piece is further improved, and the problem of non-uniform density of the tungsten alloy sintering piece is solved.
Preferably, the PVA accounts for 40-80% of the forming agent A by mass.
By adopting the technical scheme, the dosage of PVA is controlled, so that on one hand, the tackifying effect of the PVA is better, and the effect of improving the density of the tungsten alloy sintered part is better; on the other hand, the effect of enhancing the molecular motion capability of the raw materials is better, so that the density distribution of the tungsten alloy sintered piece is more uniform.
Preferably, the forming agent B is a mixture of stearic acid/stearate and amides.
By adopting the technical scheme, the stearic acid/stearate and the amides have synergistic effect, so that the surface of the raw material can be coated with a layer of oleophylic groups, the affinity between the tungsten alloy powder and the forming agent is enhanced, and the density uniformity of the tungsten alloy sintered piece is further improved.
Preferably, the tungsten alloy powder is a mixed powder prepared by adding pure metal powder or alloy powder into reduced tungsten powder serving as base powder, the particle size of the reduced tungsten powder is 0.1-30 μm, the pure metal powder is one of Ni, fe, co, cu, mo and Cr, the alloy powder comprises at least two elements of Ni, fe, co, cu, mo and Cr, the pure metal powder or the alloy powder accounts for 1-40 wt% of the tungsten alloy powder, and the particle sizes of the pure metal powder and the alloy powder are both 0.1-38 μm.
By adopting the technical scheme, the use amounts of the pure metal powder and the alloy powder in the tungsten alloy powder are controlled, so that the density distribution of the tungsten alloy sintered part is uniform, and the matching property between the raw materials is stronger, thereby improving the density of the tungsten alloy sintered part.
Preferably, the particle sizes of the pure metal powder and the alloy powder are both 0.1-10 μm.
By adopting the technical scheme, the density of the tungsten alloy sintered part is further improved.
In a second aspect, the present application provides a method for preparing a tungsten alloy granulated material for high-speed pressing, which adopts the following technical scheme: the preparation method of the tungsten alloy granulating material for high-speed pressing comprises the following steps:
s1, mixing tungsten alloy powder, a forming agent A and deionized water, and then performing ball milling for 2-24 hours to obtain tungsten alloy slurry, wherein the ball-to-material ratio during ball milling is (1-3): 1;
s2, carrying out spray granulation on the tungsten alloy slurry to obtain tungsten alloy granulated powder, and uniformly mixing the tungsten alloy granulated powder with the forming agent B to obtain the tungsten alloy granulated material for high-speed pressing.
By adopting the technical scheme, the preferable forming agent is added after granulation, so that the lubricating property is improved, and the problems of die sticking and uneven density during the pressing of the existing tungsten alloy granulated powder can be solved.
Preferably, the weight ratio of the tungsten alloy powder to the solvent is 1: (0.1-0.3).
By adopting the technical scheme, the viscosity of the tungsten alloy granulating material for high-speed pressing can be controlled by controlling the weight ratio of the tungsten alloy powder to the solvent, so that the density of the tungsten alloy granulating material for high-speed pressing is controlled.
Preferably, the method further comprises a screening step, specifically: and screening the tungsten alloy granulation powder, mixing the tungsten alloy granulation powder with a forming agent B, wherein the granularity of the screened tungsten alloy granulation powder is 75-180 mu m.
By adopting the technical scheme, the granulated powder is screened to obtain the powder with a specific particle size range, so that the fluidity and the filling stability of the tungsten alloy granulated powder can be improved.
In summary, the present application has the following beneficial effects:
1. according to the method, the forming agent A and the forming agent B are used as forming agents, the PVA and the PEG in the forming agent A can increase the viscosity of the tungsten alloy sintered piece, so that the density of the tungsten alloy sintered piece is improved, the PEG and the PVA interact with each other, the molecular motion capability of raw materials is improved, the tungsten alloy powder is dispersed more uniformly, but the PVA is poor in thermal stability, a pressed product becomes brittle at a higher temperature, the forming agent A fails, the forming agent B can form a hydrogen bond with hydroxyl of the forming agent A, the thermal stability of the forming agent A is improved, the forming agent B has a lubricating effect, the problem of mucosa during pressing of tungsten alloy granulated powder can be solved, the forming agent B and the forming agent A are cooperated and mutually cross-linked, the uniformity of the raw material distribution of the tungsten alloy sintered piece is further improved, the density uniformity of the tungsten alloy sintered piece is further improved, and the problem of nonuniform density of the tungsten alloy sintered piece is solved.
2. According to the method, the granulated powder is screened to obtain the powder with a specific particle size range, the flowability and the filling stability of the granulated powder are improved, the preferable forming agent is added after granulation, the lubricating property is improved, and the problems of die sticking and uneven density during pressing of the existing tungsten alloy granulated powder can be solved.
Detailed Description
The present application is described in further detail below with reference to preparation examples and examples.
The raw material sources of the preparation examples and the examples are shown in Table 1.
TABLE 1 preparation examples, examples raw material specifications and sources
Preparation example of tungsten alloy powder
Preparation example 1
A tungsten alloy powder is prepared by the following steps: mixing 4.6g of reduced tungsten powder, 0.88g of nickel powder and 0.59g of iron powder to prepare tungsten alloy powder, wherein the particle size of the reduced tungsten powder is 0.1 mu m, and the particle sizes of the Ni powder and the Fe powder are both 0.1 mu m.
Preparation example 2
Preparation 2 is based on preparation 1, with the difference from preparation 1 that: the particle size of the reduced tungsten powder is 30 micrometers, the particle size of the reduced tungsten powder is 7.35g, the particle size of the Cu-Ni alloy powder is 0.07g, the particle size of the reduced tungsten powder is 30 micrometers, and the particle size of the Cu-Ni alloy powder is 38 micrometers.
Preparation example 3
Preparation example 3 is based on preparation example 1, and differs from preparation example 1 in that the tungsten alloy powder comprises the following raw materials: 3.68g of reduced tungsten powder and 2.453g of Mo-Ni-Fe alloy powder, wherein the particle size of the reduced tungsten powder is 10 mu m, and the particle size of the Mo-Ni-Fe alloy powder is 20 mu m.
Preparation example 4
Preparation example 4 is based on preparation example 1, and is different from preparation example 1 in that the tungsten alloy powder comprises the following raw materials: 5.52g of reduced tungsten powder and 1.38g of Ni-Fe alloy powder, wherein the particle size of the reduced tungsten powder is 0.5 mu m, and the particle size of the Ni-Fe alloy powder is 0.2 mu m.
Preparation example 5
Preparation 5 is based on preparation 2 and differs from preparation 2 only in that: the particle size of the Cu-Ni alloy powder is 10 mu m.
Examples
Example 1
A tungsten alloy granulated material for high-speed pressing is prepared by the following steps:
s1, mixing 9.85g of tungsten alloy powder, 0.1g of forming agent A and 10.94g of deionized water, and then performing ball milling for 5 hours to prepare tungsten alloy slurry, wherein the ball-to-material ratio is 1:1;
s2, carrying out spray granulation on the tungsten alloy slurry to obtain tungsten alloy granulated powder, and uniformly mixing the tungsten alloy granulated powder with 0.05g of forming agent B to obtain tungsten alloy granulated materials for high-speed pressing;
the former was prepared by mixing 0.03g of PVA type 04-99 and 0.07g of PEG2000, the former B was prepared by mixing 0.02g of polyvinyl alcohol type 10-92 and 0.03g of EBS type 001, and the tungsten alloy powder was obtained from preparation example 3.
Examples 2 to 5
Examples 2 to 5 are based on example 1 and differ from example 1 only in that: the types and the amounts of the raw materials used are different, and are shown in Table 2.
TABLE 2 types and amounts of raw materials for examples 1 to 5
Examples 6 to 8
Examples 6 to 8 are based on example 1 and differ from example 1 only in that: the weight percentages of PVA in forming agent A were varied, as shown in Table 3.
TABLE 3 weight percent of PVA in forming agent A of examples 6-8
| Examples | Example 6 | Example 7 | Example 8 |
| PVA(wt％) | 40 | 60 | 80 |
Example 9
Example 9 is based on example 1 and differs from example 1 only in that: molding agent B was prepared from 0.03g of EBS type 001 and 0.02g of zinc stearate.
Examples 10 to 12
Examples 10 to 12 are based on example 1 and differ from example 1 only in that: in the ball milling in the step S1, the weight ratio of the tungsten alloy powder to the solvent is different, which is shown in table 4.
TABLE 4 tungsten alloy powder to solvent weight ratios for examples 10-12
Examples 13 to 15
Examples 13 to 15 are based on example 1 and differ from example 1 only in that: the method also comprises a screening step of the tungsten alloy granulated powder, which specifically comprises the following steps: the tungsten alloy granulated powder is mixed with the forming agent B after being screened, and the granularity of the tungsten alloy granulated powder after being screened is shown in Table 5.
TABLE 5 particle size of granulated tungsten alloy powders of examples 13 to 15
| Examples | Example 13 | Example 14 | Example 15 |
| Particle size (. Mu.m) | 75 | 180 | 100 |
Example 16
Example 16 is based on example 1 and differs from example 1 only in that: the tungsten alloy powder was derived from preparation example 1.
Example 17
Example 17 is based on example 1 and differs from example 1 only in that: the tungsten alloy powder was derived from preparation example 5.
Example 18
Example 18 is based on example 1 and differs from example 1 only in that: the tungsten alloy powder was derived from preparation example 4.
Comparative example
Comparative example 1
Comparative example 1 is based on example 1 and differs from example 1 only in that: the same amount of the molding agent A was replaced with the molding agent B.
Comparative example 2
Comparative example 2 is based on example 1 and differs from example 1 only in that: the same amount of forming agent A was used in place of the same amount of forming agent B.
Comparative example 3
Comparative example 3 is based on example 1 and differs from example 1 only in that: replacing former A and former B with 0.15g of a binder comprising, in mass percent, 59% Polyoxymethylene (POM), 35% polyethylene glycol (PEG), 3% High Density Polyethylene (HDPE), 2% Ethylene Vinyl Acetate (EVA), and 1% Stearic Acid (SA); wherein the melt index of the Polyoxymethylene (POM) is 100g/10min; the relative molecular weight of polyethylene glycol (PEG) is 4000.
The high-density polyethylene is 9001 available from the trade of plastic raw materials of Changpian Rena in Dongguan city, the ethylene-vinyl acetate copolymer is 7350F available from Dingxin plastic raw materials Co., ltd in Dongguan city, and the CAS number of stearic acid is 57-11-4.
Performance test
The tungsten alloys for compaction of examples 1 to 18 and comparative examples 1 to 3 were subjected to the following performance tests.
Pressing the prepared tungsten alloy granulation material for high-speed pressing on a press at 600MP to form a square green body with the length, width and height of 3cm, selecting an n-heptane solvent, and thermally degreasing the green body under the protection of hydrogen, wherein the heating curve of the thermal degreasing is as follows: heating from room temperature to 500 ℃ at a heating rate of 4 ℃/min per minute, and keeping the temperature for 2 hours; then heated to 750 ℃ at the heating rate of 2 ℃/min and kept for 3 hours. Then liquid phase sintering is carried out at 1430 ℃ in hydrogen atmosphere to obtain the tungsten alloy sintered piece.
And (3) mucosa observation: the pressed green body was observed for the presence of a sticking phenomenon.
And (3) density line observation: and observing whether the tungsten alloy sintered part has a density line or not.
And (3) testing the density: a sintered part A and a sintered part B with the length, width and height of 1cm are cut from a tungsten alloy sintered part, and a density test is carried out by using a multifunctional Taiwan MatsuHaku electronic densitometer JT-120E, wherein the test principle is an underwater replacement method based on the Archimedes principle.
Density = (weight of sample in air × water density)/(weight of sample in air-weight of sample in water) was observed to find: examples 1-18 all had no mucositis, comparative examples 1 and 2 had slight mucositis, and comparative example 3. Examples 1-18 all had no density lines, and comparative examples 1-3 had density lines.
The density tests of the sintered tungsten alloy articles of examples 1 to 18 and comparative examples 1 to 3 are shown in Table 6.
TABLE 6 Density of tungsten alloy sintered compacts of test examples 1 to 18 and comparative examples 1 to 3
Analysis of the above test data reveals that:
the data for comparative examples 1-5 show the best density uniformity for example 1, and thus example 1 is the best example among examples 1-5.
Comparative examples 1 to 3 are different from example 1 only in that an equivalent amount of forming agent a is replaced by forming agent B, comparative example 2 is different from example 1 only in that an equivalent amount of forming agent B is replaced by forming agent a, comparative example 3 is different from example 1 in that a commercially available binder is used instead of forming agent a and forming agent B, the tungsten alloy powder of comparative examples 1 to 3 has a sticking phenomenon when green compacts are pressed, density lines exist on the tungsten alloy sintered pieces of comparative examples 1 to 3, the density uniformity thereof is also poor, the density of the tungsten alloy sintered pieces a, B and C of example 1 is different by 0.001g/cm3, it is demonstrated that forming agent B and forming agent a synergistically act and cross-link with each other, the uniformity of the distribution of the raw material of the tungsten alloy sintered pieces can be improved, the density uniformity of the tungsten alloy sintered pieces can be further improved, the problem of the density non-uniformity of the tungsten alloy sintered pieces can be solved, wherein the addition of forming agent B can form hydrogen bonds with the hydroxyl group of forming agent a, the thermal stability of forming agent a can be improved, and forming agent B has a lubricating effect, and the problem of tungsten alloy powder can be solved when pressed.
The density of the embodiments 6 to 8 is higher than that of the embodiment 1, and the density uniformity is better, which shows that when the weight percentage of PVA in the forming agent A is 40 to 80 percent by controlling the dosage of PVA, on one hand, the tackifying effect of the forming agent A is better, and the effect of improving the density of the tungsten alloy sintered piece is better; on the other hand, the effect of enhancing the molecular motion capability of the raw materials is better, so that the density distribution of the tungsten alloy sintered piece is more uniform.
The density uniformity of the tungsten alloy sintered piece is better than that of the tungsten alloy sintered piece in example 1, and the stearic acid/stearate and the amides have synergistic effect, so that the surface of the raw material can be coated with a layer of oleophylic groups, the affinity between the tungsten alloy powder and the forming agent is enhanced, and the density uniformity of the tungsten alloy sintered piece is further improved.
The density uniformity of examples 10-12 was better than that of example 1, indicating that the weight ratio of tungsten alloy powder to solvent was 1: (0.1-0.3), it is demonstrated that the viscosity of the tungsten alloy granulated material for high-speed pressing can be controlled by controlling the weight ratio of the tungsten alloy powder to the solvent, thereby controlling the density of the tungsten alloy granulated material for high-speed pressing.
Examples 13-15 all had better density uniformity than example 1, demonstrating that sieving the granulated powder to obtain a powder with a specific particle size range improves the flowability and packing stability of the granulated tungsten alloy powder.
The specific embodiments are only for explaining the present application and are not limiting to the present application, and those skilled in the art can make modifications to the embodiments without inventive contribution as required after reading the present specification, but all the embodiments are protected by patent law within the scope of the claims of the present application.
Claims (7)
1. The tungsten alloy granulating material for high-speed pressing is characterized by comprising, by weight, 98-99% of tungsten alloy powder, 0.5-1.5% of forming agent A and 0.5-1% of forming agent B, wherein the tungsten alloy powder is mixed powder prepared by taking reduced tungsten powder as base powder and adding pure metal powder or alloy powder, the particle size of the reduced tungsten powder is 0.1-30 mu m, the pure metal powder is one of Ni, fe, co, cu, mo and Cr, the alloy powder comprises at least two elements of Ni, fe, co, cu, mo and Cr, the particle sizes of the pure metal powder and the alloy powder are both 0.1-38 mu m, and the particle size ratio of the reduced tungsten powder to the pure metal powder or the alloy powder is (1-3): 1, the forming agent A is a mixture of PVA and PEG, the PVA accounts for 40-80% of the forming agent A by mass, and the forming agent B is a mixture of at least two of stearic acid/stearates, amides and polyvinyl alcohol.
2. The tungsten alloy granulated material for high-speed pressing according to claim 1, wherein: and the forming agent B is a mixture of stearic acid/stearate and amides.
3. The tungsten alloy granulated material for high-speed pressing according to claim 1, wherein: the pure metal powder or the alloy powder accounts for 1 to 40 percent of the weight of the tungsten alloy powder.
4. A tungsten alloy granulated material for high-speed pressing according to claim 3, wherein: the granularity of the pure metal powder and the granularity of the alloy powder are both 0.1-10 mu m.
5. A method of producing granulated tungsten alloy for high-speed compaction according to any of claims 1 to 4, comprising the steps of:
s1, mixing tungsten alloy powder, a forming agent A and deionized water, and then performing ball milling for 2-24 hours to obtain tungsten alloy slurry, wherein the ball-to-material ratio during ball milling is (1-3): 1;
s2, carrying out spray granulation on the tungsten alloy slurry to obtain tungsten alloy granulated powder, and uniformly mixing the tungsten alloy granulated powder with the forming agent B to obtain the tungsten alloy granulated material for high-speed pressing.
6. The method of claim 5, wherein the tungsten alloy granulation material for high-speed compaction comprises: the weight ratio of the tungsten alloy powder to the deionized water is 1: (0.1-0.3).
7. The method of claim 5, wherein the tungsten alloy granulation material for high-speed compaction comprises: the method also comprises a screening step, which specifically comprises the following steps: and screening the tungsten alloy granulation powder, mixing the tungsten alloy granulation powder with a forming agent B, wherein the granularity of the screened tungsten alloy granulation powder is 75-180 mu m.
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| EP1094909B1 (en) * | 1998-05-15 | 2004-12-22 | Höganäs Ab | Iron-based metallurgical compositions containing flow agents and methods for using same |
| US7153339B2 (en) * | 2004-04-06 | 2006-12-26 | Hoeganaes Corporation | Powder metallurgical compositions and methods for making the same |
| JP5544928B2 (en) * | 2010-02-26 | 2014-07-09 | セイコーエプソン株式会社 | Granulated powder and method for producing granulated powder |
| TWI522192B (en) * | 2012-07-31 | 2016-02-21 | 台耀科技股份有限公司 | Method of producing pressed-and-sintered workpiece and workpiece thereof |
| CN105382255B (en) * | 2015-12-14 | 2017-09-26 | 北京科技大学 | A kind of nano-tungsten powder ejection forming method |
| CN111644625B (en) * | 2020-06-04 | 2022-05-24 | 东睦新材料集团股份有限公司 | Preparation method of chromium alloy fuel cell connecting piece |
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