CN114029709B - Forming method of iridium alloy sealing cladding - Google Patents
Forming method of iridium alloy sealing cladding Download PDFInfo
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- CN114029709B CN114029709B CN202111462478.2A CN202111462478A CN114029709B CN 114029709 B CN114029709 B CN 114029709B CN 202111462478 A CN202111462478 A CN 202111462478A CN 114029709 B CN114029709 B CN 114029709B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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Abstract
The invention discloses a method for forming an iridium alloy sealing cladding, which comprises the following steps: rolling an iridium alloy plate; (2) preparing an iridium alloy wafer; (3) spin forming an iridium alloy cladding: and (3) forming by adopting a hot spinning mode, and then performing precision machining to obtain the iridium alloy sealed cladding. According to the invention, in the hot rolling process of the iridium alloy plate, the stainless steel sheet is coated on the basis of the traditional molybdenum sheet coating process, so that the volatilization of the molybdenum sheet can be inhibited, the heat insulation effect of the alloy blank is improved, the generation and the expansion of cracks on the surface of the plate blank are prevented, and the yield of the iridium alloy plate is improved. The hot spinning method is adopted for forming the cladding, the spinning temperature is increased, and the pass deformation is controlled, so that the problem that microcracks are easily generated due to stress concentration at the corner at the bottom of the cladding in the stamping process is solved, and the finished product rate of the iridium alloy cladding forming is improved. The method solves the problem of low finished product rate of iridium alloy plate and cladding forming, and can effectively promote 238 Development process of Pu isotope heat source.
Description
Technical Field
The invention belongs to the technical field of isotope heat sources, power supplies and precious metal processing, and particularly relates to a forming method of an iridium alloy sealing cladding.
Background
The iridium alloy has the characteristics of high melting point, high-temperature oxidation resistance, excellent high-temperature mechanical property and the like, and is only suitable for hectowatt level at present 238 puO 2 An enclosure material for an isotope heat source. However, iridium is easy to have brittle fracture in the processing process, polycrystalline iridium cracks along a grain boundary in the plastic deformation process, the corresponding strain rate is sensitive, and the iridium is processed into a hardened block, has high brittle-tough transition temperature, and cannot be subjected to plastic processing at room temperature. In order to improve the processing plasticity of the iridium alloy, a high-temperature rolling mode is often adopted to reduce the work hardening rate and the work hardening rate of the iridium alloyResistance to deformation. At present, the high-temperature rolling of iridium mainly adopts a molybdenum sheet coating mode, and because molybdenum is seriously volatilized at high temperature, the rolling temperature is low, the alloy deformation resistance is large, the pass deformation is only about 10 percent, and the alloy sheet can be prepared by multi-pass processing. The forming technology of the iridium alloy cladding mainly adopts stamping, and has the defects that the stress at the corner at the bottom of the cladding is concentrated to form wrinkles, and micro cracks are easily generated in a spinning piece, so that the yield is low. Therefore, the forming process of the iridium alloy plate and the cladding is improved, the yield of the iridium alloy cladding is improved, and the method is suitable for the production of the iridium alloy plate and the cladding 238 PuO 2 The development of isotope heat sources has important significance.
Disclosure of Invention
The invention aims to provide a method for forming an iridium alloy sealing cladding.
The technical scheme of the invention is as follows:
a forming method of an iridium alloy sealing cladding is characterized by comprising the following steps: preparing an iridium alloy plate by hot rolling and cold rolling, and coating a stainless steel sheet on the basis of coating a molybdenum sheet in the hot rolling process; the cladding is formed by hot spinning, the spinning temperature is increased in the hot spinning process, and the pass deformation is controlled. The method comprises the following steps:
(1) Rolling the iridium alloy plate: preparing an iridium alloy plate with a certain thickness by sequentially adopting a hot rolling method and a cold rolling method;
(2) Preparing iridium alloy wafer cutting: processing the iridium alloy plate into an iridium alloy wafer by adopting linear cutting, and carrying out annealing, acid pickling, grinding and polishing treatment on the obtained wafer;
(3) Spin forming iridium alloy cladding: and (3) forming the iridium alloy wafer treated in the step (2) by adopting a hot spinning mode, and performing precision machining after forming to obtain the iridium alloy sealed cladding.
Wherein, before hot rolling, the surface of the iridium alloy cast ingot is sequentially coated with a molybdenum sheet and a stainless steel sheet.
Wherein the hot rolling temperature is 900-1300 ℃, the rolling pass deformation is 15-30%, and the thickness of the iridium alloy is about 1.5mm.
Wherein, the rolling pass deformation is 3-5%, and the thickness of the iridium alloy is 1mm after cold rolling.
Wherein the annealing temperature is 900 ℃, the annealing time is 10min, and the atmosphere is vacuum.
Wherein the pickling solution is a mixed solution of hydrofluoric acid and nitric acid at 90 ℃ for 10-15 min.
Wherein the hot spinning temperature is 1100-1200 ℃, the rotating speed is 400-600 mm/min, and the feeding ratio is 0.1-0.3 mm/r.
Wherein, molybdenum disulfide is smeared on the surface of the wafer as a lubricant in the hot spinning process.
The iridium alloy cladding prepared by the method has the advantages that:
the method for preparing the iridium alloy cladding is simple and convenient, and the finished product rate is high. According to the invention, the stainless steel sheet is coated on the basis of the molybdenum sheet, so that the volatilization of the molybdenum sheet is inhibited, the heat insulation effect of the alloy blank is improved, the generation and the expansion of cracks on the surface of the plate blank are prevented, the yield of the iridium alloy plate is improved, and the rolling frequency can be reduced. The forming method mainly aims at the defect that the current iridium alloy cladding is formed by adopting a stamping process, and the defects that the stress concentration at the corner at the bottom of the cladding forms a wrinkle, and microcracks are easily generated in a spinning piece, so that the yield is low are caused. The invention adopts a direct hot spinning mode to prepare the iridium alloy cladding shell, and improves the finished product rate of iridium alloy cladding shell forming by improving spinning temperature and controlling pass deformation.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1
This example produces an iridium alloy sealed envelope 30mm in diameter and 15mm high by:
step (1) rolling iridium alloy plate
Taking an iridium alloy cast ingot, sequentially coating molybdenum and stainless steel on the iridium alloy cast ingot, and hot rolling. The hot rolling process specifically comprises the following steps:
(1.1) rolling to the thickness of 9mm, wherein the rolling temperature is 1300 ℃, the pass deformation is 30%;
(1.2) rolling to the thickness of 4mm at the temperature of 1200 ℃ and the pass deformation of 20%;
(1.3) rolling to the thickness of about 2mm at the temperature of 1050 ℃ and the pass deformation of 15%;
(1.4) corroding molybdenum and stainless steel;
(1.5) the temperature is 900 ℃, the pass deformation is 15%, and the rolling thickness is about 1.5mm;
(1.6) rolling a sheet with the thickness of 1.0mm on a precision cold rolling mill, wherein the pass deformation is 5%.
Step (2) iridium alloy wafer cutting
Cutting the iridium alloy plate with the diameter of 1.0mm by using a slow-moving wire cutting machine tool to process an iridium alloy wafer with the size of phi 55 mm; the iridium alloy wafer is put into hydrofluoric acid and nitric acid solution (the proportion is 3: 7) at 90 ℃ for acid cleaning for 15min, then is soaked in concentrated nitric acid solution at 90 ℃ for treatment for 5min, and then is repeatedly deacidified in deionized water and alcohol.
Step (3) iridium alloy cladding spin forming
Spinning by adopting a high-speed numerical control metal spinning machine. And (3) heating the iridium wafer at 1100 ℃ for 15min, and then spinning, wherein the spinning is carried out in multiple passes. The spinning profiling rotating speed is 400mm/min, and the feeding is 0.1mm/r. And coating molybdenum disulfide as a lubricant on the surface of the wafer in the spinning process, and precisely machining the wafer on a common lathe by using a cubic boron nitride lathe tool after the spinning process is finished to finally prepare the iridium alloy cladding.
In the hot rolling process of the iridium alloy plate, the stainless steel sheet is coated on the basis of the traditional molybdenum sheet coating process, so that the volatilization of the molybdenum sheet can be inhibited, the heat insulation effect of the alloy blank is improved, the generation and the expansion of cracks on the surface of the plate blank are prevented, and the yield of the iridium alloy plate is improved. The hot spinning method is adopted for forming the cladding, the spinning temperature is increased, and the pass deformation is controlled, so that the problem that microcracks are easily generated due to stress concentration at the corner at the bottom of the cladding in the stamping process is solved, and the finished product rate of the iridium alloy cladding forming is improved. The method solves the problem of low finished product rate of iridium alloy plate and cladding forming, and can effectively promote 238 Development process of Pu isotope heat source.
The present invention is not limited to the above-described embodiments, and those skilled in the art will be able to make various modifications without creative efforts from the above-described conception, and fall within the scope of the present invention.
Claims (3)
1. A method for forming an iridium alloy sealed envelope, comprising the steps of:
(1) Rolling the iridium alloy plate: preparing an iridium alloy plate with a certain thickness by sequentially adopting a hot rolling method and a cold rolling method; sequentially coating a molybdenum sheet and a stainless steel sheet on the surface of the iridium alloy cast ingot before hot rolling; the hot rolling method comprises the following specific steps: the rolling temperature is 1300 ℃, the pass deformation is 30 percent, and the thickness is 9mm; the rolling temperature is 1200 ℃, the pass deformation is 20%, and the thickness is 4mm;
the rolling temperature is 1050 ℃, the pass deformation is 15%, and the thickness is 2mm; corroding molybdenum and stainless steel; the rolling temperature is 900 ℃, the pass deformation is 15%, and the thickness is 1.5mm; in the cold rolling method, the rolling pass deformation is 3-5%, and the thickness of the iridium alloy is 1mm after cold rolling;
(2) Preparing an iridium alloy wafer: processing the iridium alloy plate into an iridium alloy wafer by adopting linear cutting, and carrying out annealing, acid pickling, grinding and polishing treatment on the obtained wafer;
(3) Spin forming iridium alloy cladding: forming the iridium alloy wafer treated in the step (2) in a hot spinning mode, and performing precision machining after forming to obtain an iridium alloy sealed cladding; the hot spinning temperature is 1100-1200 ℃, the rotating speed is 400-600 mm/min, and the feeding ratio is 0.1-0.3 mm/r; and coating molybdenum disulfide as a lubricant on the surface of the wafer in the hot spinning process.
2. The method of claim 1, wherein in step (2), the annealing temperature is 900 ℃ for 10min, and the atmosphere is vacuum.
3. The method for forming the iridium alloy sealed envelope according to claim 1, wherein in the step (2), the pickling solution is a mixed solution of hydrofluoric acid and nitric acid at 90 ℃ for 10 to 15min.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86108434A (en) * | 1986-12-20 | 1988-08-10 | 冶金工业部钢铁研究总院 | The manufacture method of iridium crucible |
| CN102205486A (en) * | 2011-03-31 | 2011-10-05 | 西北有色金属研究院 | Method for processing iridium alloy bar or plate |
| CN104668909A (en) * | 2015-02-05 | 2015-06-03 | 北京华夏富润工贸有限公司 | High-precision weldless iridium crucible and manufacturing method of iridium products |
| CN107699831A (en) * | 2017-10-13 | 2018-02-16 | 东北大学 | Pack rolling as-cast state TiAl sheet alloy method based on composite structural design |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8936664B2 (en) * | 2011-08-05 | 2015-01-20 | Crucible Intellectual Property, Llc | Crucible materials for alloy melting |
| US9108243B2 (en) * | 2013-03-14 | 2015-08-18 | Crucible Intellectual Property, Llc | Production of large-area bulk metallic glass sheets by spinning |
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- 2021-12-03 CN CN202111462478.2A patent/CN114029709B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86108434A (en) * | 1986-12-20 | 1988-08-10 | 冶金工业部钢铁研究总院 | The manufacture method of iridium crucible |
| CN102205486A (en) * | 2011-03-31 | 2011-10-05 | 西北有色金属研究院 | Method for processing iridium alloy bar or plate |
| CN104668909A (en) * | 2015-02-05 | 2015-06-03 | 北京华夏富润工贸有限公司 | High-precision weldless iridium crucible and manufacturing method of iridium products |
| CN107699831A (en) * | 2017-10-13 | 2018-02-16 | 东北大学 | Pack rolling as-cast state TiAl sheet alloy method based on composite structural design |
Non-Patent Citations (1)
| Title |
|---|
| 放射性同位素电池用铱合金包壳材料的研究进展;谢勇等;《贵金属》;20191130;第40卷(第4期);第78页-第84页 * |
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