CN113814404A - Preparation method of jewelry copper-tin alloy additive - Google Patents
Preparation method of jewelry copper-tin alloy additive Download PDFInfo
- Publication number
- CN113814404A CN113814404A CN202110949844.0A CN202110949844A CN113814404A CN 113814404 A CN113814404 A CN 113814404A CN 202110949844 A CN202110949844 A CN 202110949844A CN 113814404 A CN113814404 A CN 113814404A
- Authority
- CN
- China
- Prior art keywords
- copper
- percent
- tin alloy
- jewelry
- alloy additive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y70/00—Materials specially adapted for additive manufacturing
-
- 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
- C22C1/0425—Copper-based alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C9/00—Alloys based on copper
- C22C9/02—Alloys based on copper with tin as the next major constituent
-
- 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
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
- B22F2009/0824—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid with a specific atomising fluid
-
- 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
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
- B22F2009/0844—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid in controlled atmosphere
Abstract
The invention provides a preparation method of a jewelry copper-tin alloy additive with high elasticity and high hardness, which comprises the following steps: (1) vacuumizing the formula elements of the jewelry copper-tin alloy additive in a vacuum furnace, and then heating and melting to obtain metal liquid, wherein the temperature for heating and melting is 1200-1300 ℃; (2) conveying the metal liquid into a tightly coupled spray disc for crushing and atomizing, and introducing inert gas in the atomizing process, wherein the flow rate of the inert gas is 2000-4000 cubic meters per hour; (3) the atomized material enters a cooling tower to be cooled and formed in a flying way; (4) separating the materials collected at the bottom of the cooling tower by adopting a cyclone separation device; the formula of the jewelry copper-tin alloy additive comprises the following components in percentage by weight: 86% -95% of copper; 5% -14% of tin; nickel is less than or equal to 0.03 percent; 0.0004% -1% of lead; oxygen is less than 0.8 percent; iron is less than 0.8 percent; carbon is less than 0.8 percent; the impurities are less than 2 percent, wherein the sum of the weight percentages of the components is 100 percent.
Description
Technical Field
The invention belongs to the technical field of copper-tin alloy, and particularly relates to a preparation method of a jewelry copper-tin alloy additive.
Background
With the improvement of living standard of people, jewelry becomes an indispensable part of daily life of modern people, and various ornaments fill the life of people. In recent years, with the desire of people for a good and happy living standard, higher requirements are put on the related performances of jewelry.
At present, metal jewelry mostly takes lead as a manufacturing raw material, and the appearance, the shape and the practical performance of the jewelry are more emphasized. However, the lead jewelry pollutes the environment during the manufacturing and using processes, can cause great harm to the health of people, and even can cause lead poisoning, especially chronic lead poisoning has the first to be poisoned by other poisonings. Therefore, the international market is strictly restricting the manufacture and sale of lead jewelry. But the jewelry mainly made of silver and gold is expensive and high in cost. Moreover, the tendency to black by oxidation is a common problem faced by these silver and silver alloys.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a preparation method of a copper-tin alloy additive with high elasticity and high hardness.
The invention provides a preparation method of a jewelry copper-tin alloy additive, which comprises the following steps:
(1) vacuumizing the formula elements of the jewelry copper-tin alloy additive in a vacuum furnace, and then heating and melting to obtain metal liquid, wherein the temperature for heating and melting is 1200-1300 ℃;
(2) conveying the metal liquid into a tightly coupled spray disc for crushing and atomizing, and introducing inert gas in the atomizing process, wherein the flow rate of the inert gas is 2000-4000 cubic meters per hour;
(3) the atomized material enters a cooling tower to be cooled and formed in a flying way;
(4) separating the materials collected at the bottom of the cooling tower by adopting a cyclone separation device;
the formula of the jewelry copper-tin alloy additive comprises the following components in percentage by weight: 86% -95% of copper; 5% -14% of tin; nickel is less than or equal to 0.03 percent; 0.0004% -1% of lead; oxygen is less than 0.8 percent; iron is less than 0.8 percent; carbon is less than 0.8 percent; the impurities are less than 2 percent, wherein the sum of the weight percentages of the components is 100 percent.
Preferably, the copper is 88% -92%.
Preferably, the tin is 8% -12%.
Preferably, the tower diameter of the cooling tower is 1750mm-1850mm
Preferably, the tower height of the cooling tower is 8000mm-10000 mm.
Preferably, the temperature of the elevated temperature melting is 1200 ℃, 1250 ℃ or 1300 ℃.
Preferably, in the step (2), the flow rate of the inert gas is 3000-4000 cubic meters per hour.
Preferably, the step (4) is further followed by a sieving separation step.
Preferably, in the step (1), the pressure for vacuumizing is-5 to-20 Pa.
The copper-tin alloy prepared by the preparation method of the copper-tin alloy additive provided by the invention has the advantages of high elasticity and high hardness.
Drawings
The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular description of preferred embodiments of the invention, as illustrated in the accompanying drawings. Like reference numerals refer to like parts throughout the drawings, and the drawings are not intended to be drawn to scale in actual dimensions, emphasis instead being placed upon illustrating the principles of the invention.
Fig. 1 is a schematic flow chart of a preparation method of a copper-tin alloy additive provided by an embodiment of the invention.
Detailed Description
The technical solutions of the present invention are further described in detail with reference to specific examples so that those skilled in the art can better understand the present invention and can implement the present invention, but the examples are not intended to limit the present invention.
Referring to fig. 1, an embodiment of the present invention provides a method for preparing a jewelry copper-tin alloy additive, including the following steps:
(1) vacuumizing the formula elements of the jewelry copper-tin alloy additive in a vacuum furnace, and then heating and melting to obtain metal liquid, wherein the temperature for heating and melting is 1200-1300 ℃;
(2) conveying the metal liquid into a tightly coupled spray disc for crushing and atomizing, and introducing inert gas in the atomizing process, wherein the flow rate of the inert gas is 2000-4000 cubic meters per hour;
(3) the atomized material enters a cooling tower to be cooled and formed in a flying way;
(4) separating the materials collected at the bottom of the cooling tower by adopting a cyclone separation device;
the formula of the jewelry copper-tin alloy additive comprises the following components in percentage by weight: 86% -95% of copper; 5% -14% of tin; nickel is less than or equal to 0.03 percent; 0.0004% -1% of lead; oxygen is less than 0.8 percent; iron is less than 0.8 percent; carbon is less than 0.8 percent; the impurities are less than 2 percent, wherein the sum of the weight percentages of the components is 100 percent.
According to the preparation method of the copper-tin alloy additive material, the copper element and the tin element are reasonably matched, so that the prepared copper-tin alloy additive material has high elasticity and high hardness, and can be well used for preparing ornaments, particularly jewelry.
This embodiment realizes better powder effect of refining through the broken atomizing of close coupling formula spray disc, simultaneously through letting in inert gas at the high-speed in-process of atomizing, realizes the lower effect of granule oxygen content. And the inert gas is introduced at a high speed, so that the function of atomizing metal crushing can be achieved, and the copper-tin alloy additive material prepared by matching with the alloy formula of the copper-tin alloy has better performance and can be used for preparing metal ornaments.
The embodiment carries out flight cooling through the cooling tower to and cyclone separates, and the cost is lower, and realization tiny particle powder preparation that can be better, the alloy powder particle diameter that realizes preparing is less, and the particle diameter is homogeneous. The product is guaranteed to be solid spherical powder, good product forming is guaranteed, and alloy performance is good. The copper-tin alloy additive material prepared by the preparation method of the cobalt-chromium-molybdenum-tungsten-silicon alloy provided by the embodiment has uniform particle size, is in a fine spherical shape and has a small particle size. And the preparation method is mature, the used equipment is advanced, and the energy consumption is saved.
The copper-tin alloy additive prepared by the preparation method of the copper-tin alloy additive provided by the embodiment is solid and spherical in appearance, and has a density of 6.8-6.9 +/-0.2 g/cm3Elongation after fracture is more than or equal to 2 percent, 0.2 percent stipulates that the non-proportional elongation strength is more than or equal to 80Mpa, Vickers hardness: 300 +/-27; melting temperature: 1200-1300 ℃; oxygen content: 100-; fluidity:
18.2s (hall flow rate); particle size distribution: 15-53 um.
In a preferred embodiment, the copper is 88% -92%.
In a preferred embodiment, the tin is 8% -12%.
In a preferred embodiment, the tower diameter of the cooling tower is 1750mm-1850mm
In a preferred embodiment, the tower height of the cooling tower is 8000mm-10000 mm.
In a preferred embodiment, the temperature of the elevated temperature melting is 1200 deg.C, 1250 deg.C or 1300 deg.C
In a preferred embodiment, said step (4) is followed by a sieving separation step.
In a preferred embodiment, in the step (1), the pressure for vacuumizing is-5 to-20 Pa.
Referring to fig. 1, in a preferred embodiment, the preparation method specifically comprises the following steps:
s1, fine and high-quality filtering material and ingredients;
s2 feeding 100 KG;
s3, introducing into a vacuum furnace for vacuumizing, wherein the vacuumizing pressure is-10 Pa;
s4, heating and melting, wherein the temperature for heating and melting is (1200-1300) DEG C;
s5, discharging metal liquid;
s51 introducing inert gas at a flow rate of 2000-4000 cubic meters per hour;
s6 crushing and atomizing by a tightly coupled spray disc; the metal liquid and the inert gas are simultaneously introduced into the atomization device for atomization.
S7, cooling in a cooling tower with the tower diameter of 1750mm-1850mm and the tower height of 8000mm-10000mm in a flying manner;
s8, performing cyclone separation to separate materials in the vacuum-pumping gas of the cold cutting tower;
s9, collecting and storing the material at the bottom of the tower;
s10, three-stage sieving and grain size separation;
s11, detecting the product quality;
and S12 packaging the product.
In order that the technical solutions of the present invention may be further understood and appreciated, several preferred embodiments are now described in detail.
The copper-tin alloy additive of examples 1-3 was prepared with reference to the formulation of table 1, wherein the formulation is in weight percent.
TABLE 1
The preparation of examples 1-3 was as follows:
the ingredients are mixed according to the formula shown in the table 1, 1000kg of the raw materials are fed into a vacuum furnace, the vacuum furnace is vacuumized under the pressure of-10 Pa, the vacuumized materials are heated and melted in a smelting furnace, and the temperature is increased to 1300 ℃ to obtain the metal liquid. The piece leads the metal liquid into a tightly coupled atomizing spray disk device for crushing and atomizing, and simultaneously leads ultrahigh-speed inert gas (nitrogen) into the tightly coupled atomizing spray disk, wherein the lead-in flow rate of the ultrahigh-speed inert gas is 2000 cubic meters per hour. And introducing the atomized material into a cooling tower for flying cooling, wherein the tower diameter of the cooling tower is 1800mm, and the tower height is 9000 mm. Adopt cyclone to separate the material that the cooling tower bottom was collected, collect the less granule of particle diameter, then carry out tertiary granulometric separation that sieves, carry out the cold mould press forming with the material of collecting, cold mould press forming's pressure is: 80-100 tons of the copper-tin alloy additive is subjected to vacuum sintering after being molded by cold die pressing, wherein the vacuum sintering temperature is 120-160 ℃, and the copper-tin alloy additive is obtained. The alloy additive appearance is solid spherical.
Effects of the embodiment
The copper-tin alloy additive materials prepared in examples 1-3 were subjected to performance testing. Including density, elongation after break, 0.2% specified non-proportional tensile strength, vickers hardness, melting temperature, oxygen content, flowability, and particle size distribution.
The test results obtained are shown in table 2.
TABLE 2
As can be seen from the data in table 2, the copper-tin alloy additive prepared in the embodiments 1 to 3 has higher elasticity and higher hardness, and can be better applied to the preparation of jewelry, so that more material choices are provided for the preparation of jewelry. And the copper-tin alloy has better material additive performance, lower cost and greater application value.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. A preparation method of a jewelry copper-tin alloy additive is characterized by comprising the following steps:
(1) vacuumizing the formula elements of the jewelry copper-tin alloy additive in a vacuum furnace, and then heating and melting to obtain metal liquid, wherein the temperature for heating and melting is 1200-1300 ℃;
(2) conveying the metal liquid into a tightly coupled spray disc for crushing and atomizing, and introducing inert gas in the atomizing process, wherein the flow rate of the inert gas is 2000-4000 cubic meters per hour;
(3) the atomized material enters a cooling tower to be cooled and formed in a flying way;
(4) separating the materials collected at the bottom of the cooling tower by adopting a cyclone separation device;
the formula of the jewelry copper-tin alloy additive comprises the following components in percentage by weight: 86% -95% of copper; 5% -14% of tin; nickel is less than or equal to 0.03 percent; 0.0004% -1% of lead; oxygen is less than 0.8 percent; iron is less than 0.8 percent; carbon is less than 0.8 percent; the impurities are less than 2 percent, wherein the sum of the weight percentages of the components is 100 percent.
2. The method of making a jewelry copper-tin alloy additive of claim 1, wherein said copper is 88% to 92%.
3. The method of making a jewelry copper-tin alloy additive of claim 1, wherein said tin is 8% to 12%.
4. The method of claim 1, wherein the cooling tower has a tower diameter of 1750mm to 1850 mm.
5. The method of claim 1, wherein the cooling tower has a tower height of 8000mm to 10000 mm.
6. The method of claim 1, wherein the elevated melting temperature is 1200 ℃, 1250 ℃, or 1300 ℃.
7. The method according to claim 7, wherein in the step (2), the flow rate of the inert gas is 3000-4000 cubic meters per hour.
8. The method for preparing the copper-tin alloy additive according to claim 1, wherein the step (4) is further followed by a sieving separation step.
9. The method for preparing the copper-tin alloy additive material according to claim 1, wherein in the step (1), the pressure for vacuumizing is-5 to-20 Pa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110949844.0A CN113814404A (en) | 2021-08-18 | 2021-08-18 | Preparation method of jewelry copper-tin alloy additive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110949844.0A CN113814404A (en) | 2021-08-18 | 2021-08-18 | Preparation method of jewelry copper-tin alloy additive |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113814404A true CN113814404A (en) | 2021-12-21 |
Family
ID=78913247
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110949844.0A Pending CN113814404A (en) | 2021-08-18 | 2021-08-18 | Preparation method of jewelry copper-tin alloy additive |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113814404A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3655367A (en) * | 1970-07-15 | 1972-04-11 | Albert B Bleecker | Copper alloy |
| FR2244589A1 (en) * | 1973-09-26 | 1975-04-18 | Ordena Trudovogo Krasnogo Znamen,Su | Blowing air or water into metal melt stream and making metal powder - elongate nozzles and melt stream employed |
| US6346215B1 (en) * | 1997-12-19 | 2002-02-12 | Wieland-Werke Ag | Copper-tin alloys and uses thereof |
| CN101696477A (en) * | 2009-10-23 | 2010-04-21 | 吴棕洋 | Lead-free copper base alloy powder material and preparation method thereof |
| CN103540791A (en) * | 2013-10-17 | 2014-01-29 | 常熟市良益金属材料有限公司 | Copper-tin alloy |
| CN103962564A (en) * | 2014-04-18 | 2014-08-06 | 浙江旭德新材料有限公司 | Method for preparing spherical bronze alloy powder |
| CN111826546A (en) * | 2020-06-30 | 2020-10-27 | 飞亚达精密科技股份有限公司 | Bronze material, preparation method thereof and processing method for manufacturing clock shell |
| CN112809011A (en) * | 2020-12-31 | 2021-05-18 | 广州湘龙高新材料科技股份有限公司 | Preparation method of cobalt-chromium-molybdenum-tungsten-silicon alloy |
-
2021
- 2021-08-18 CN CN202110949844.0A patent/CN113814404A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3655367A (en) * | 1970-07-15 | 1972-04-11 | Albert B Bleecker | Copper alloy |
| FR2244589A1 (en) * | 1973-09-26 | 1975-04-18 | Ordena Trudovogo Krasnogo Znamen,Su | Blowing air or water into metal melt stream and making metal powder - elongate nozzles and melt stream employed |
| US6346215B1 (en) * | 1997-12-19 | 2002-02-12 | Wieland-Werke Ag | Copper-tin alloys and uses thereof |
| CN101696477A (en) * | 2009-10-23 | 2010-04-21 | 吴棕洋 | Lead-free copper base alloy powder material and preparation method thereof |
| CN103540791A (en) * | 2013-10-17 | 2014-01-29 | 常熟市良益金属材料有限公司 | Copper-tin alloy |
| CN103962564A (en) * | 2014-04-18 | 2014-08-06 | 浙江旭德新材料有限公司 | Method for preparing spherical bronze alloy powder |
| CN111826546A (en) * | 2020-06-30 | 2020-10-27 | 飞亚达精密科技股份有限公司 | Bronze material, preparation method thereof and processing method for manufacturing clock shell |
| CN112809011A (en) * | 2020-12-31 | 2021-05-18 | 广州湘龙高新材料科技股份有限公司 | Preparation method of cobalt-chromium-molybdenum-tungsten-silicon alloy |
Non-Patent Citations (4)
| Title |
|---|
| 丁莉等: "《宝石资源通论》", 30 September 2013, 中国地质大学出版社有限公司 * |
| 朱红等: "《3D打印材料》", 30 September 2017, 华中科技大学出版社 * |
| 袁军平等: "《流行饰品材料及生产工艺（第二版）》", 30 June 2015, 中国地质大学出版社 * |
| 陈继民: "《3D打印技术基础教程》", 31 January 2016, 冶金工业出版社 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113308624B (en) | Zinc alloy additive and preparation method thereof | |
| CN101934373B (en) | Process for preparing titanium and titanium alloy from titanium hydride powder | |
| CN113275577A (en) | Preparation method of zinc alloy additive | |
| CN103785846A (en) | Method for preparing titanium alloy spherical powder at all levels | |
| TW201812033A (en) | A method for manufacturing a lead-free or low lead content brass billet and billet thus obtained | |
| CN109500391A (en) | A kind of preparation method of high ductility silver zinc oxide contact material | |
| CN110508800B (en) | Pre-alloy powder used for composite binder grinding tool for grinding hard and brittle materials, preparation method of pre-alloy powder and grinding tool | |
| CN110653373A (en) | Matrix material for porous diamond grinding tool and preparation method | |
| CN113814404A (en) | Preparation method of jewelry copper-tin alloy additive | |
| CN113817930A (en) | Jewelry copper-tin alloy additive and preparation method thereof | |
| CN112809011A (en) | Preparation method of cobalt-chromium-molybdenum-tungsten-silicon alloy | |
| CN110079691B (en) | Molybdenum-copper alloy with low molybdenum content and preparation method thereof | |
| DE3116185A1 (en) | "METAL BINDER FOR COMPRESSING METAL POWDER" | |
| US4859412A (en) | Method of producing alloyed powders for dental amalgams | |
| CN111636055A (en) | Aluminum-scandium alloy sputtering target material with uniform components and preparation method thereof | |
| CN109593981A (en) | A kind of preparation method for the sliver oxidized tin contactor materials improving ingot blank agglutinating property | |
| CN109609794A (en) | A kind of preparation method of high ductility sliver oxidized tin contactor materials | |
| CN114855056A (en) | Preparation method of heterojunction sintering alnico doped with cast alnico | |
| CN115846672A (en) | Preparation method of high-strength high-conductivity copper-based composite material for lead frame | |
| CN110860686A (en) | Small-particle-size cobalt-chromium-tungsten-molybdenum alloy spherical powder and preparation method thereof | |
| US4707332A (en) | Sintering process for prealloyed powders | |
| CN105603285A (en) | Preparation method of La2O3 modified ultrafine hard alloy | |
| CN114951666A (en) | Preparation method of aluminum scandium target material | |
| CN109500392B (en) | Preparation method of silver zinc oxide contact material for improving sintering property of ingot blank | |
| JPS6247449A (en) | Heat resistant aluminum alloy for powder metallurgy and its manufacture |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |