阅读说明：本技术 高铑含量铂铑合金丝材的加工方法 (Processing method of platinum-rhodium alloy wire with high rhodium content ) 是由 王志江 何蔓 周佳磊 金英杰 施卫锋 吴雨 于 2020-07-15 设计创作，主要内容包括：本发明涉及一种高铑含量铂铑合金丝材的加工方法,属于金属材料技术领域。其经过真空熔炼、热锻成条、轧长轧圆、高温拉拔最终制得φ0.1～φ3.0mm的铂铑合金丝材。本发明制得的铂铑合金丝材表面光滑、圆润,且无白点、波节、皲裂等缺陷,可用于加热组元、温度测量等领域,使用效果良好。本发明采用真空熔炼和高温拉拔工艺制作高铑含量铂铑合金丝材,相较于传统冷加工,具有加工周期短、贵金属损耗小、产品质量稳定等优点。(The invention relates to a processing method of a platinum-rhodium alloy wire with high rhodium content, belonging to the technical field of metal materials. The platinum-rhodium alloy wire with phi of 0.1-phi 3.0mm is finally prepared by vacuum melting, hot forging into strips, rolling into long and round rolls and high-temperature drawing. The platinum-rhodium alloy wire prepared by the method has smooth and round surface, has no defects of white spots, wave nodes, chaps and the like, can be used in the fields of heating components, temperature measurement and the like, and has good use effect. The invention adopts vacuum melting and high-temperature drawing processes to manufacture the platinum-rhodium alloy wire with high rhodium content, and compared with the traditional cold processing, the invention has the advantages of short processing period, low precious metal loss, stable product quality and the like.)

1. The processing method of the platinum-rhodium alloy wire with high rhodium content is characterized by comprising the following steps:

(1) vacuum smelting: accurately weighing rhodium powder and pure platinum according to the proportion, putting the rhodium powder and the pure platinum into a vacuum induction furnace for 1900-2200 ℃ smelting and exhausting, wherein the vacuum degree is less than 30Pa, and casting the rhodium powder and the pure platinum into a cylindrical water-cooled copper mold with the caliber of phi 18-phi 22mm under the protection of inert gas after smelting for 0.5-1 h;

(2) hot forging into strips: putting the ingot obtained in the step (1) into an annealing furnace for carrying out homogenization annealing, and forging;

(3) rolling length and rolling circle: processing the bar stock obtained in the step (2) to phi 4.0mm by using a bar rolling machine;

(4) high-temperature drawing: and (4) drawing the thick wire obtained in the step (3) by using high-temperature drawing equipment until a finished product platinum-rhodium alloy wire with the diameter of 0.1-3.0 mm is obtained.

2. The method for processing the platinum-rhodium alloy wire with high rhodium content as claimed in claim 1, which is characterized in that: the purities of the rhodium powder and the pure platinum in the step (1) respectively meet SM-Rh99.95% and SM-Pt99.95%; wherein the rhodium powder accounts for 22.5 to 50.5 percent of the mass ratio of the final alloy.

3. The method for processing the platinum-rhodium alloy wire with high rhodium content as claimed in claim 1, which is characterized in that: the inert gas in the step (1) is argon or nitrogen, and the pressure is 1000-20000 Pa.

4. The method for processing the platinum-rhodium alloy wire with high rhodium content as claimed in claim 1, which is characterized in that: the homogenizing annealing forging process in the step (2) is specifically that after heat preservation is carried out for 0.2-0.5 h at 1200-1300 ℃, the material is taken out and hot forged according to the machining rate of 30-40%, and then annealing is carried out again; the above operation was repeated until the ingot was forged to a billet having a cross section of 10 x 10 mm.

5. The method for processing the platinum-rhodium alloy wire with high rhodium content as claimed in claim 1, which is characterized in that: the pass processing rate in the step (3) and the step (4) is 10-30%.

6. The method for processing the platinum-rhodium alloy wire with high rhodium content as claimed in claim 1, which is characterized in that: the strip rolling machine in the step (3) is of a diamond hole bidirectional rolling structure.

7. High temperature drawing equipment, characterized by: comprises a wire releasing barrel (1), a wire releasing frame (2), a wire drawing machine (3), a high-temperature furnace (4), a wire collecting barrel (5), a wire collecting frame (6), a wire drawing die (8), an atmosphere cooling pipe (9) and a frame (10) which are connected in sequence;

the wire drawing machine is characterized in that a wire paying-off barrel (1), a wire drawing machine (3), a high-temperature furnace (4) and a wire winding barrel (5) are sequentially arranged on the rack (10); a wire releasing frame (2) is arranged on the wire releasing barrel (1); a wire collecting frame (6) is arranged on the wire collecting barrel (5);

a wire drawing die (8) and an atmosphere cooling pipe (9) are also arranged between the high-temperature furnace (4) and the take-up barrel (5); the wire drawing die (8) and the atmosphere cooling pipe (9) are also arranged on the frame (10).

Technical Field

The invention relates to a processing method of a platinum-rhodium alloy wire with high rhodium content, belonging to the technical field of metal materials.

Background

Platinum and platinum rhodium alloys are widely used in the glass industry, in catalytic meshes, in heating elements and in temperature measurements. The high rhodium content platinum-rhodium alloy wire is an extremely important application door, such as PtRh30-PtRh6 thermocouple wire, PtRh40-PtRh20 thermocouple wire, PtRh40 heating wire and the like.

Because of the high strength and extremely fast hardening rate of the platinum-rhodium alloy with high rhodium content, the processing is very difficult, and the traditional cold processing technology has the following disadvantages:

(1) if the wire diameter of the finished platinum-rhodium alloy wire is thin, the machining efficiency is low and the auxiliary material consumption is large due to the fact that the pass machining rate is small and the number of required machining passes is large, and meanwhile the precious metal loss is increased in the multi-pass machining process;

(2) due to factors such as hardening, lubrication and the like, the cold-processed wire often has defects such as white spots, wave nodes, chaps and the like on the surface, and the attractiveness and the service life of the product are seriously influenced.

Disclosure of Invention

The invention aims to overcome the defects and provide the method for processing the platinum-rhodium alloy wire with high rhodium content, which has the advantages of short processing period, low precious metal loss, stable product quality and the like.

The technical scheme of the invention is a processing method of a platinum-rhodium alloy wire with high rhodium content, which comprises the following steps:

(1) vacuum smelting: accurately weighing rhodium powder and pure platinum according to the proportion, putting the rhodium powder and the pure platinum into a vacuum induction furnace for 1900-2200 ℃ smelting and exhausting, wherein the vacuum degree is less than 30Pa, and casting the rhodium powder and the pure platinum into a cylindrical water-cooled copper mold with the caliber of phi 18-phi 22mm under the protection of inert gas after smelting for 0.5-1 h;

(2) hot forging into strips: putting the ingot obtained in the step (1) into an annealing furnace for carrying out homogenization annealing, and forging;

(3) rolling length and rolling circle: processing the bar stock obtained in the step (2) to phi 4.0mm by using a bar rolling machine;

(4) high-temperature drawing: and (4) drawing the thick wire obtained in the step (3) by using high-temperature drawing equipment until a finished product platinum-rhodium alloy wire with the diameter of 0.1-3.0 mm is obtained.

Further, the purities of the rhodium powder and the pure platinum in the step (1) respectively meet SM-Rh99.95% and SM-Pt99.95%; wherein the rhodium powder accounts for 22.5 to 50.5 percent of the mass ratio of the final alloy.

Further, the inert gas in the step (1) is argon or nitrogen, and the pressure is 1000-20000 Pa.

Further, the homogenizing annealing forging process in the step (2) is specifically that after the temperature is kept at 1200-1300 ℃ for 0.2-0.5 h, the material is taken out and hot forged according to the machining rate of 30-40% and then annealed again; the above operation was repeated until the ingot was forged to a billet having a cross section of 10 x 10 mm.

Further, the pass processing rate in the step (3) and the step (4) is 10% to 30%.

Further, the strip rolling mill in the step (3) is in a diamond hole bidirectional rolling structure.

The high-temperature drawing equipment comprises a pay-off barrel, a pay-off frame, a wire drawing machine, a high-temperature furnace, a take-up barrel, a take-up frame, a wire drawing die, an atmosphere cooling pipe and a rack which are connected in sequence;

the wire drawing machine is characterized in that a wire paying-off barrel, a wire drawing machine, a high-temperature furnace and a wire winding barrel are sequentially arranged on the rack; a wire releasing frame is arranged on the wire releasing barrel; a wire collecting frame is arranged on the wire collecting barrel;

a wire drawing die and an atmosphere cooling pipe are also arranged between the high-temperature furnace and the wire take-up barrel; the wire-drawing die and the atmosphere cooling pipe are also arranged on the frame.

The invention has the beneficial effects that: the platinum-rhodium alloy wire prepared by the method has smooth and round surface, has no defects of white spots, wave nodes, chaps and the like, can be used in the fields of heating components, temperature measurement and the like, and has good use effect. The invention adopts vacuum melting and high-temperature drawing processes to manufacture the platinum-rhodium alloy wire with high rhodium content, and compared with the traditional cold processing, the invention has the advantages of short processing period, low precious metal loss, stable product quality and the like.

Drawings

FIG. 1 is a front view of a high temperature drawing apparatus.

FIG. 2 is a top view of a high temperature drawing apparatus.

FIG. 3 is a perspective view of a high temperature drawing apparatus.

Description of reference numerals: 1. paying off a barrel; 2. a wire frame is laid out; 3. a wire drawing machine; 4. a high temperature furnace; 5. a take-up barrel; 6. a wire-collecting frame; 7. wire material; 8. drawing a wire die; 9. an atmosphere cooling tube; 10. and a frame.

Detailed Description