WO2021060754A1 - 비철금속 분말의 제조 방법 - Google Patents
비철금속 분말의 제조 방법 Download PDFInfo
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- WO2021060754A1 WO2021060754A1 PCT/KR2020/012368 KR2020012368W WO2021060754A1 WO 2021060754 A1 WO2021060754 A1 WO 2021060754A1 KR 2020012368 W KR2020012368 W KR 2020012368W WO 2021060754 A1 WO2021060754 A1 WO 2021060754A1
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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
- B22F9/16—Making metallic powder or suspensions thereof using chemical processes
- B22F9/18—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds
- B22F9/20—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from solid metal compounds
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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
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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
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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
- B22F2203/00—Controlling
- B22F2203/11—Controlling temperature, temperature profile
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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
- B22F2302/00—Metal Compound, non-Metallic compound or non-metal composition of the powder or its coating
- B22F2302/25—Oxide
Definitions
- the present invention relates to a method for producing one kind of nonferrous metal powder selected from the group consisting of nickel, zirconium, molybdenum and chromium having excellent physical properties and properties under extreme conditions, and particularly excellent in corrosion resistance, heat resistance and abrasion resistance.
- the present invention relates to a method of manufacturing a non-ferrous metal powder capable of mass production and cost reduction using a multi-step reduction process.
- Nonferrous metal powders such as nickel, zirconium, molybdenum, and chromium have excellent corrosion resistance, heat resistance, and abrasion resistance, and are used as a major element of stainless steel or superalloy, or a major component of cemented carbide. These metal materials are not only expensive raw materials, but also have a high manufacturing cost.
- Nickel is applied as a nickel-based superalloy to the rotating body or non-rotating body of aircraft engines or high-performance turbines, and is used in major parts that operate in extremely high temperature environments. In addition, many are used as plating materials. In addition, it is widely used as an essential material for a positive electrode material of a battery.
- Zirconium is used for corrosion-resistant valves, aerospace parts, and coating materials for nuclear fuel due to its excellent high-temperature and oxidation-resistance properties, and is used as a major additive element for high-temperature nickel alloys.
- Molybdenum is a major constituent element of stainless steel or superalloy, and is a major element that imparts high-temperature oxidation resistance. Recently, it is also used in many semiconductor manufacturing processes. It is also widely used as an essential material for battery cathode materials.
- Chromium is used as a major component of stainless steel, nickel-based superalloy, and cobalt-based superalloy. Recently, it has been widely used in interconnects of fuel cells.
- non-ferrous metals are produced as metallic materials by refining each metal oxide through a chemical method or an electrochemical method.
- chemical or electrochemical refining technology causes a lot of environmental problems and does not have high process efficiency, and thus serves as a major reason for increasing the price of metal materials.
- U.S. Patent No. 6,264,719 discloses a method of manufacturing titanium alumina suspended with a small amount of aluminum oxide as a metal matrix composite powder when a small amount of titanium dioxide is reacted with aluminum metal powders.
- An object of the present invention is to provide a manufacturing method that can produce non-ferrous metal powders such as nickel, zirconium, molybdenum, and chromium of excellent quality at low cost, and can be easily expanded to an industrial scale.
- the above-described task is a) a step of partially reducing each of a calcium oxide (CaO) and one kind of nonferrous metal oxide selected from the group consisting of nickel oxide, zirconium oxide, molybdenum oxide and chromium oxide; b) preparing a first mixture by mixing the partially reduced calcium oxide and non-ferrous metal oxide; c) preparing a second mixture by mixing the first mixture and calcium hydride; And d) completely reducing the second mixture to prepare a non-ferrous metal.
- a calcium oxide CaO
- one kind of nonferrous metal oxide selected from the group consisting of nickel oxide, zirconium oxide, molybdenum oxide and chromium oxide
- the subject of the present invention is a step of partially reducing one of calcium oxide (CaO) and one of a non-ferrous metal oxide selected from the group consisting of nickel oxide, zirconium oxide, molybdenum oxide and chromium oxide; b) preparing a first mixture by mixing one of the partially reduced calcium oxide and the non-ferrous metal oxide and the other one of the partially reduced calcium oxide and the non-ferrous metal oxide; c) preparing a second mixture by mixing the first mixture and calcium hydride; And d) completely reducing the second mixture to prepare a non-ferrous metal.
- CaO calcium oxide
- a non-ferrous metal oxide selected from the group consisting of nickel oxide, zirconium oxide, molybdenum oxide and chromium oxide
- it may include the step of partially reducing the first mixture after step b) and before step c).
- the partial reduction of step a) and complete reduction of step d) may be performed by heat treatment for 1 to 10 hours under a temperature of 1,000°C to 1,500°C and a hydrogen atmosphere.
- the partial reduction in step a) and complete reduction in step d) may be performed by heat treatment for 1 to 10 hours under a temperature of 1,000°C to 1,500°C and a hydrogen atmosphere.
- the stoichiometric ratio of the first mixture and the calcium hydride may be 1:1.1 to 1.25.
- the present invention can provide a low-cost manufacturing method capable of manufacturing non-ferrous metal powders such as nickel, zirconium, molybdenum, and chromium of excellent quality that can be used in more application fields.
- non-ferrous metal powders such as nickel, zirconium, molybdenum, and chromium of excellent quality that can be used in more application fields.
- non-ferrous metal powders such as nickel, zirconium, molybdenum, and chromium of excellent quality
- aerospace, medical or military use such as aerospace, medical or military use.
- FIG. 1 is a scanning electron micrograph showing the shape (Morphology) of a nickel metal powder prepared according to the present invention.
- FIG. 2 is an X-ray diffraction pattern showing a material phase of a nickel metal powder prepared according to the present invention.
- 3 is a scanning electron micrograph showing the shape of the zirconium metal powder prepared according to the present invention.
- FIG. 4 is an X-ray diffraction pattern showing a material phase of zirconium metal powder prepared according to the present invention.
- FIG. 5 is a scanning electron micrograph showing the shape of a molybdenum metal powder prepared according to the present invention.
- FIG. 6 is an X-ray diffraction pattern showing a material phase of molybdenum metal powder prepared according to the present invention.
- the term “about” refers to 30, 25, 20, 15, 10, 9, 8, 7, 6, 5, or 30, 25, 20, 15, 10, 9, 8, 7, 6, 5, or relative to a reference amount, level, value, number, frequency, percentage, dimension, size, amount, weight or length. It means an amount, level, value, number, frequency, percentage, dimension, size, amount, weight or length varying by 4, 3, 2 or 1%.
- the method for producing a non-ferrous metal powder selected from the group consisting of nickel, zirconium, molybdenum and chromium according to the present invention is characterized in that it includes a multi-step reduction step.
- it characterized in that it comprises a two-step reduction step. More preferably it comprises the following steps:
- e) further comprising a step of pulverizing and pulverizing the prepared non-ferrous metal (powdering step).
- each of a calcium oxide (CaO) and a non-ferrous metal oxide selected from the group consisting of nickel oxide, zirconium oxide, molybdenum oxide, and chromium oxide is partially reduced (first reduction step).
- the first reduction step may be performed by heat-treating each of calcium oxide (CaO) and the one type of nonferrous metal oxide at a temperature of 1,000°C to 1,500°C and a hydrogen atmosphere for 1 to 10 hours as a raw material.
- the heat treatment temperature may be preferably 1,100°C to 1,300°C, more preferably 1,100°C to 1,200°C.
- the treatment time may preferably be 2 to 4 hours.
- the hydrogen atmosphere may have a hydrogen gas flow of 1.5 l/min or more, preferably 1.5 l/min to 5 l/min, which may vary depending on the size of the heat treatment furnace and the amount of raw materials.
- the heat treatment furnace may be a tube furnace.
- the heat treatment furnace used in the present invention may have two separate heat treatment zones for the first reduction step and the second reduction step. All types of furnaces operating under a gaseous atmosphere capable of accelerating the reduction reaction, preferably operating at temperatures of up to 1,500° C. can be used.
- the heat treatment furnace should be suitable for work using gases such as hydrogen and argon.
- Each heat treatment zone can individually form a hydrogen gas flow.
- the oxygen content of the raw material calcium oxide and the non-ferrous metal oxide may be reduced through heat treatment, and an oxide that can be easily reduced in the second reduction step may be formed.
- the calcium oxide and the non-ferrous metal oxide are in powder form.
- the first reduction step includes: a1) a first partial reduction step of partially reducing each of the calcium oxide and the one type of non-ferrous metal oxide; And a2) a second partial reduction step of partially reducing the first mixture obtained by mixing the partially reduced calcium oxide and the one type of non-ferrous metal oxide.
- the second partial reduction step may be performed under the same conditions as the first partial reduction step. That is, the first mixture may be heat-treated for 1 to 10 hours under a temperature of 1,000°C to 1,500°C and a hydrogen atmosphere.
- the heat treatment temperature may be preferably 1,100°C to 1,300°C, more preferably 1,100°C to 1,200°C.
- the treatment time may preferably be 2 to 4 hours.
- the hydrogen atmosphere may have a hydrogen gas flow of 1.5 l/min or more, preferably 1.5 l/min to 5 l/min, which may vary depending on the size of the heat treatment furnace and the amount of raw materials.
- only calcium oxide and the one kind of non-ferrous metal oxide may be partially reduced in the first reduction step.
- first mixing step the partially reduced calcium oxide and the one kind of non-ferrous metal oxide are mixed to prepare a first mixture
- second mixing step the first mixture and calcium hydride are mixed to prepare a second mixture.
- the first mixture and calcium hydride are preferably mixed in a stoichiometric ratio of 1:1.1 to 1.25.
- calcium hydride may be in the form of a powder or granules, and the particle size may be preferably 0.02 to 2 mm.
- the calcium hydride used in the present invention may be a commercially available product, but preferably, the calcium hydride used in the present invention is a calcium metal shaving or calcium metal granule 550 to 750 in a hydrogen gas atmosphere. It may be converted calcium hydride pieces or granules by heating for 1 to 10 hours at a temperature of °C.
- the second mixture is heat-treated to completely reduce it to prepare one type of nonferrous metal selected from the group consisting of nickel, zirconium, molybdenum, and chromium (second reduction step).
- the heat treatment may be performed for 1 to 10 hours under a temperature of 1,000°C to 1,500°C and a hydrogen atmosphere.
- the heat treatment temperature may be preferably 1,100°C to 1,300°C, more preferably 1,100°C to 1,200°C.
- the treatment time may preferably be 2 to 4 hours.
- the hydrogen atmosphere may have a hydrogen gas flow of 1.5 l/min or more, preferably 1.5 l/min to 5 l/min, which may vary depending on the size of the heat treatment furnace and the amount of the mixture.
- the heat treatment furnace used in the second reduction step is the same as described in the first reduction step.
- a mixture of partially reduced calcium oxide and the one kind of nonferrous metal oxide and calcium hydride as a reducing agent may react in a hydrogen atmosphere to form one of nickel, zirconium, molybdenum, and chromium.
- the non-ferrous metal thus formed is recovered.
- the powder produced in the e) recovery step may be pulverized through washing and drying steps.
- one of the recovered nickel, zirconium, molybdenum, and chromium nonferrous metal is in bulk form, and thus may be pulverized using a high-energy ball milling apparatus before washing and drying steps.
- the pulverized powder is mixed with water to form a slurry, and washed while stirring.
- a solvent such as acetic acid may be added to the slurry.
- the powder may be dried at a temperature of 80 to 90°C in an open-type low-temperature oven.
- One nonferrous metal of nickel, zirconium, molybdenum and chromium prepared in the present invention is in powder form, and has a particle size distribution of 50 ⁇ m or less, preferably 10 to 50 ⁇ m.
- the residual oxygen content is less than 1.0% by weight, preferably less than 0.5% by weight.
- powder refers to a particle size of 2 mm or less.
- X50 indicates the particle size distribution of the final powder, and indicates the median diameter or the median value of the particle size distribution.
- X50 indicates a particle size distribution of 50 ⁇ m or less, or 40 ⁇ m or less, more preferably 20 ⁇ m or less.
- the apparatus used to analyze the nickel, zirconium, and molybdenum metal powder finally prepared in the present invention is shown in Table 2 below.
- Partially reduced CaO and NiO are mixed (the first mixture) and placed in a SUS310S crucible and equally in a heat treatment area where uniform temperature is maintained in a tubular tube furnace at 1,100°C for 2 hours in a hydrogen gas atmosphere of 2 to 3 L/min. Reduced. 100 g of the first mixture and 22.5 g of calcium hydride powder (particle size of 0.02 to 2 mm) were thoroughly mixed to prepare a second mixture. The stoichiometric ratio of the first mixture and calcium hydride is 1:1.1-1.25x.
- the second mixture was put in a SUS310S crucible and completely reduced for 2 hours at 1,100°C in a hydrogen gas atmosphere of 2 to 3 l/min in the heat treatment zone of a tubular tube furnace.
- the obtained bulk material was put into a ball milling apparatus, pulverized, mixed with water and acetic acid, washed with stirring, and dried completely at 80°C.
- the physical properties of the metal powder were measured using the apparatus of Table 2 above.
- a scanning electron micrograph of the prepared powder is shown in FIG. 1.
- the X-ray diffraction pattern was measured and shown in FIG. 2 to confirm the material of the prepared powder. Referring to FIG. 2, it can be seen that the prepared powder is a pure nickel (Ni) metal in which no other intermediate phase appears.
- the first mixture Mix the partially reduced CaO and ZrO 2 (the first mixture), put it in a SUS310S crucible, and in the same heat treatment area where the uniform temperature in the tubular tube furnace is maintained, in a hydrogen gas atmosphere of 2 to 3 L/min at 1,100°C for 2 hours. Partially reduced. 100 g of the first mixture and 25 g of calcium hydride powder (particle size of 0.02 to 2 mm) were thoroughly mixed to prepare a second mixture. The stoichiometric ratio of the first mixture and calcium hydride is 1:1.1-1.25x.
- the second mixture was put in a SUS310S crucible and completely reduced for 2 hours at 1,100°C in a hydrogen gas atmosphere of 2 to 3 l/min in the heat treatment zone of a tubular tube furnace.
- the obtained bulk material was put into a ball milling apparatus, pulverized, mixed with water and acetic acid, washed with stirring, and dried completely at 80°C.
- the physical properties of the metal powder were measured using the apparatus of Table 2.
- a scanning electron micrograph of the prepared powder is shown in FIG. 3.
- the X-ray diffraction pattern was measured and shown in FIG. 4 to confirm the material of the prepared powder. 4, the prepared powder clearly shows a peak of Zr pure metal.
- intermediate phases appear at the points of 2 theta (2 ⁇ ) of 32.5 degrees, 37.5 degrees, 54.5 degrees and 65 degrees, and these phases are confirmed to be ZrH 2 phases.
- These phases can be removed by subjecting to further heat treatment in the post-treatment process. It can be seen that the other intermediate phases are zirconium (Zr) metal powders that do not appear.
- Zr zirconium
- the first mixture Mix the partially reduced CaO and MoO 3 (the first mixture), put it in a SUS310S crucible, and in the same heat treatment zone where the uniform temperature in the tubular tube furnace is maintained, in a hydrogen gas atmosphere of 2 to 3 L/min at 1,100°C for 2 hours. Partially reduced. 100 g of the first mixture and 29 g of calcium hydride powder (particle size of 0.02 to 2 mm) were thoroughly mixed to prepare a second mixture. The stoichiometric ratio of the first mixture and calcium hydride is 1:1.1-1.25x.
- the second mixture was put in a SUS310S crucible and completely reduced for 2 hours at 1,100°C in a hydrogen gas atmosphere of 2 to 3 l/min in the heat treatment zone of a tubular tube furnace.
- the obtained bulk material was put into a ball milling apparatus, pulverized, mixed with water and acetic acid, washed with stirring, and dried completely at 80°C.
- the physical properties of the metal powder were measured using the apparatus of Table 2.
- a scanning electron micrograph of the prepared powder is shown in FIG. 5.
- the X-ray diffraction pattern was measured and shown in FIG. 6 to confirm the material of the prepared powder. 5, it can be seen that the prepared powder is a pure molybdenum (Mo) metal in which no other intermediate phase appears.
- the particles have a shape close to a spherical shape, and it can be seen that particles of about 1 to 10 microns are dispersed.
- the amount of residual oxygen in the resulting molybdenum metal powder was less than 0.172% by weight.
- the first mixture Mix the partially reduced CaO and Cr2O 3 (the first mixture), put it in a SUS310S crucible, and in the same heat treatment area where the uniform temperature in the tubular tube furnace is maintained, in a hydrogen gas atmosphere of 2 ⁇ 3 L/min at 1,100°C for 2 hours. Partially reduced. 100 g of the first mixture and 28 g of calcium hydride powder (particle size of 0.02 to 2 mm) were thoroughly mixed to prepare a second mixture. The stoichiometric ratio of the first mixture and calcium hydride is 1:1.1-1.25x.
- the second mixture was put in a SUS310S crucible and completely reduced for 2 hours at 1,100°C in a hydrogen gas atmosphere of 2 to 3 l/min in the heat treatment zone of a tubular tube furnace.
- the obtained bulk material was put into a ball milling device, pulverized, mixed with water and acetic acid, washed with stirring, and dried completely at 80°C.
- the amount of residual oxygen in the generated chromium metal powder was less than 0.171% by weight.
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Abstract
Description
구분 | 순도 | 입자크기 | 제조사 |
NiO 분말 | 99.5% | 325 mesh 이하 | Ganzhou Wanfeng Advanced Materials Tech. Co. ltd- China |
ZrO2분말 | 99.5% | 325 mesh 이하 | Ganzhou Wanfeng Advanced Materials Tech. Co. ltd- China |
MoO3 분말 | 99.5% | 325 mesh 이하 | Ganzhou Wanfeng Advanced Materials Tech. Co. ltd- China |
Cr2O3 분말 | 99.5% | 325 mesh 이하 | Ganzhou Wanfeng Advanced Materials Tech. Co. ltd- China |
CaH2 분말 | 99% | 325 mesh 이하 | ㈜NAP |
장비명 | 제조사 및 모델명 | 비고 |
X Ray Diffraction Machine | Rigaku, DMAX 2200 | X선회절시험, 상분석 |
SEM | JEOL, JSM-6380 | 주사전자현미경, 입자형상분석 |
NOH분석기 | LECO ON736 | 잔여 산소량 분석 |
Claims (7)
- a) 칼슘산화물과, 니켈산화물, 지르코늄산화물, 몰리브덴산화물 및 크롬산화물로 이루어진 군에서 선택된 1종의 비철금속 산화물 각각을 부분적으로 환원시키는 단계;b) 상기 부분적으로 환원된 칼슘산화물과 비철금속 산화물을 혼합하여 제1 혼합물을 제조하는 단계;c) 상기 제1 혼합물과 칼슘 하이드라이드를 혼합하여 제2 혼합물을 제조하는 단계; 및d) 상기 제2 혼합물을 완전히 환원시켜 비철금속을 제조하는 단계를 포함하는 비철금속 분말의 제조 방법.
- a) 칼슘산화물과, 니켈산화물, 지르코늄산화물, 몰리브덴산화물 및 크롬산화물로 이루어진 군에서 선택된 1종의 비철금속 산화물 중 하나를 부분적으로 환원시키는 단계;b) 상기 부분적으로 환원된 칼슘산화물과 비철금속 산화물 중 하나와, 상기 부분적으로 환원되지 않은 칼슘산화물과 비철금속 산화물 중 다른 하나를 혼합하여 제1 혼합물을 제조하는 단계;c) 상기 제1 혼합물과 칼슘 하이드라이드를 혼합하여 제2 혼합물을 제조하는 단계; 및d) 상기 제2 혼합물을 완전히 환원시켜 비철금속을 제조하는 단계를 포함하는 비철금속 분말의 제조 방법.
- 제1항 또는 제2항에 있어서,상기 단계 b) 후, 상기 단계 c) 전에 상기 제1 혼합물을 부분 환원시키는 단계를 포함하는, 비철금속 분말의 제조 방법.
- 제1항 또는 제2항에 있어서,상기 단계 a)의 상기 부분적 환원 및 상기 단계 d)의 완전 환원은 1,000℃ 내지 1,500℃의 온도 및 수소분위기 하에서 1 내지 10시간 동안 열처리하여 이루어지는 것을 특징으로 하는, 비철금속 분말의 제조 방법.
- 제3항에 있어서,상기 단계 a)의 상기 부분적 환원 및 상기 단계 d)의 완전 환원은 1,000℃ 내지 1,500℃의 온도 및 수소분위기 하에서 1 내지 10시간 동안 열처리하여 이루어지는 것을 특징으로 하는, 비철금속 분말의 제조 방법.
- 제1항 또는 제2항에 있어서,e) 상기 제조된 비철금속 분말을 분쇄하여 분말화시키는 단계를 추가로 포함하는 비철금속 분말의 제조 방법.
- 제1항 또는 제2항에 있어서,상기 제1 혼합물과 상기 칼슘 하이드라이드의 화학양론적 비는 1:1.1~1.25인 것을 특징으로 하는, 비철금속 분말의 제조 방법.
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KR20010022884A (ko) * | 1997-08-19 | 2001-03-26 | 브루스 도른톤 레델 | 티타늄 합금을 기초로한 분산강화 복합물 |
KR20060032637A (ko) * | 2003-07-15 | 2006-04-17 | 케메탈 게엠베하 | Ti, Zr, Hf, V, Nb, Ta 및 Cr 원소들의 금속분말 또는 금속 수소화물 분말의 제조 방법 |
KR20100132512A (ko) * | 2008-02-28 | 2010-12-17 | 케메탈 게엠베하 | 원소 Ni, Cu, Ta, W, Re, Os 및 Ir로 합금된, 티탄, 지르코늄 및 하프늄을 기재로 하는 합금 분말을 제조하는 방법 |
KR101277699B1 (ko) * | 2012-11-29 | 2013-06-21 | 한국지질자원연구원 | 삼산화 몰리브덴의 환원 및 저산소 몰리브덴 분말 제조 방법 |
KR20160010874A (ko) * | 2013-05-21 | 2016-01-28 | 회가내스 아베 (피유비엘) | 금속 함유 분말을 제조하기 위한 공정 |
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2019
- 2019-09-25 KR KR1020190118108A patent/KR102205493B1/ko active IP Right Grant
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KR20010022884A (ko) * | 1997-08-19 | 2001-03-26 | 브루스 도른톤 레델 | 티타늄 합금을 기초로한 분산강화 복합물 |
KR20060032637A (ko) * | 2003-07-15 | 2006-04-17 | 케메탈 게엠베하 | Ti, Zr, Hf, V, Nb, Ta 및 Cr 원소들의 금속분말 또는 금속 수소화물 분말의 제조 방법 |
KR20100132512A (ko) * | 2008-02-28 | 2010-12-17 | 케메탈 게엠베하 | 원소 Ni, Cu, Ta, W, Re, Os 및 Ir로 합금된, 티탄, 지르코늄 및 하프늄을 기재로 하는 합금 분말을 제조하는 방법 |
KR101277699B1 (ko) * | 2012-11-29 | 2013-06-21 | 한국지질자원연구원 | 삼산화 몰리브덴의 환원 및 저산소 몰리브덴 분말 제조 방법 |
KR20160010874A (ko) * | 2013-05-21 | 2016-01-28 | 회가내스 아베 (피유비엘) | 금속 함유 분말을 제조하기 위한 공정 |
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