阅读说明：本技术 一种低熔点抗高压的锡铅合金材料的制备工艺 (Preparation process of low-melting-point high-voltage-resistant tin-lead alloy material ) 是由 骆芳 沈逸周 蒋荣杰 路远航 柴为民 袁林江 于 2020-12-10 设计创作，主要内容包括：本发明提供了一种低熔点抗高压的锡铅合金材料的制备工艺,涉及金属材料设计技术领域,包括备料：按以下质量份的原料备料：锡1-15份、铅30-45份、铋40-60份、镉0.005-0.025份；将锡、铅、镉原料放入到熔炼炉内,调整熔炼温度到700-800℃进行炼制,并进行搅拌熔化；将熔炼温度调整至300-350℃,加入锡原料,搅拌至全部熔化后去除表层扒渣,并让其静置后得到金属热熔体；将混合热熔料过滤后,置入铸型中,冷却后得到金属锭；将金属锭加工成金属圆柱；清理整形；封装入库。本发明工艺简单,整个过程可在大气环境下进行,制作成本低,易于操作,适合大范围推广使用,合金熔点低熔化范围小,且能够在70MPa高压氢气条件下进行工作。(The invention provides a preparation process of a low-melting-point high-pressure-resistant tin-lead alloy material, which relates to the technical field of metal material design and comprises the following steps of: preparing the following raw materials in parts by mass: 1-15 parts of tin, 30-45 parts of lead, 40-60 parts of bismuth and 0.005-0.025 part of cadmium; putting raw materials of tin, lead and cadmium into a smelting furnace, adjusting the smelting temperature to 700-800 ℃ for smelting, and stirring and melting; adjusting the melting temperature to 300-350 ℃, adding a tin raw material, stirring until the tin raw material is completely melted, removing surface skimming, and standing to obtain a metal hot melt; filtering the mixed hot melting material, putting the filtered mixed hot melting material into a casting mold, and cooling the casting mold to obtain a metal ingot; processing the metal ingot into a metal cylinder; cleaning and shaping; and (7) packaging and warehousing. The invention has simple process, low manufacturing cost, easy operation, suitability for large-scale popularization and use, low melting point of the alloy, small melting range and capability of working under the condition of high-pressure hydrogen of 70MPa, and the whole process can be carried out in the atmospheric environment.)

1. A preparation process of a low-melting-point high-pressure-resistant tin-lead alloy material is characterized by comprising the following steps of:

(1) preparing the following raw materials in parts by mass: 1-5 parts of tin, 30-45 parts of lead, 40-60 parts of bismuth and 0.005-0.025 part of cadmium;

(2) putting the raw materials of lead, bismuth and cadmium in parts by mass into a smelting furnace, adjusting the smelting temperature to 700-;

(3) adjusting the smelting temperature to 300-350 ℃, adding the tin raw material in parts by mass when the temperature in the smelting furnace is reduced to 300-350 ℃, stirring until the tin raw material is completely molten, removing surface skimming, and standing to obtain an alloy hot melt;

(4) filtering the alloy hot melt through a filtering device, casting the alloy hot melt into a casting mold, and cooling the casting mold to room temperature to obtain an alloy ingot;

(5) machining the alloy ingot, and cutting the alloy ingot to a required shape and size according to requirements;

(6) carrying out surface treatment on the alloy ingot obtained by cutting in the step (5);

(7) bagging and warehousing.

2. The preparation method of the tin-lead alloy material with the specific melting point as claimed in claim 1, wherein the method comprises the following steps: the purity of the tin is more than or equal to 99.8 percent, the purity of the lead is more than or equal to 99.8 percent, and the purity of the bismuth is more than or equal to 99.8 percent.

3. The preparation method of the tin-lead alloy material with the specific melting point as claimed in claim 1, wherein the method comprises the following steps: the tin material, the lead material and the bismuth material are blocky and have the size of 22-40mm, and the cadmium material is spherical or blocky and has the diameter of 5-6 mm.

4. The preparation method of the tin-lead alloy material with the specific melting point as claimed in claim 1, wherein the method comprises the following steps: in the step (3), the stirring and melting time is 30-50 minutes, and the standing time is 25-30 minutes.

5. The preparation method of the tin-lead alloy material with the specific melting point as claimed in claim 1, wherein the method comprises the following steps: and (3) cooling the alloy hot melt to 300-400 ℃ along with the furnace, wherein the cooling along with the furnace is carried out under a vacuum condition, and the vacuum degree is 0.1-1 Pa.

6. The preparation method of the tin-lead alloy material with the specific melting point as claimed in claim 5, wherein the method comprises the following steps: and (3) stirring in the step (3) adopts electromagnetic stirring, wherein the electromagnetic stirring is started every 9-12min in the furnace cooling process, and the stirring time is 3-5 min each time.

7. The preparation method of the tin-lead alloy material with the specific melting point as claimed in claim 1, wherein the method comprises the following steps: in the step (4), the filtering device is foamed alumina, and the aperture of the foamed alumina is selected to be 80 meshes.

8. The preparation method of the tin-lead alloy material with the specific melting point as claimed in claim 1, wherein the method comprises the following steps: in the step (5), the machining process adopts a low-hardness material machining process.

9. The process for preparing a tin-lead alloy material with low melting point and high pressure resistance as claimed in claim 1, wherein: and (7) stacking the alloy ingots subjected to surface treatment up and down at intervals by using base paper, then filling the alloy ingots into bags, and then warehousing the alloy ingots.

Technical Field

The invention relates to a preparation process of a low-melting-point high-pressure-resistant tin-lead alloy material, belonging to the technical field of metal material design.

Background

Compared with traditional fossil energy such as petroleum and coal, the hydrogen energy has the advantages of cleanness, environmental protection, various sources, large-scale storage and transportation and the like, and plays an important role in energy structure. As an energy storage component of a hydrogen fuel cell automobile, a convenient and efficient hydrogen storage mode is one of key technologies for realizing large-scale commercialization of the hydrogen fuel cell automobile. High-pressure gaseous hydrogen storage and liquid hydrogen storage are two main hydrogen storage modes, and are popularized and applied. The high-pressure gaseous hydrogen storage has the advantages of simple container structure, less energy consumption for preparing compressed hydrogen, high filling speed and the like, and is a mode which is mature in technical development and most widely applied in the field of domestic hydrogen fuel cell automobiles at present. Although the vehicle-mounted high-pressure gaseous hydrogen storage technology is widely applied, a plurality of technical bottlenecks still exist in the high-performance vehicle-mounted high-pressure hydrogen storage system in China.

The cylinder mouth valve is one of key components of the whole vehicle-mounted high-pressure hydrogen storage system, plays a key role in overpressure protection of a high-pressure gas cylinder, and the hydrogen storage pressure of 70MPa puts higher requirements on the performance of the cylinder mouth valve of the gas cylinder. The cylinder mouth valve is required to be ensured to be in service for a long time under the high pressure of 70MPa, and explosion caused by the temperature rise and expansion of hydrogen is avoided at high temperature.

Therefore, the research and development of the low-melting-point high-pressure-resistant tin-lead alloy material which has simple process, easy operation and low manufacturing cost and can meet the requirements as the valve core of the bottle mouth valve of the high-pressure gas bottle is urgent.

The present application was made based on this.

Disclosure of Invention

In order to solve the defects in the prior art, the invention provides a preparation process of a low-melting-point high-pressure-resistant tin-lead alloy material, which is used as a valve core of a cylinder mouth valve of a high-pressure gas cylinder.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a preparation process of a low-melting-point high-pressure-resistant tin-lead alloy material comprises the following steps:

(1) preparing the following raw materials in parts by mass: 1-5 parts of tin, 30-45 parts of lead, 40-60 parts of bismuth and 0.005-0.025 part of cadmium; the addition of the cadmium in parts by mass can improve the fusing temperature to 120 +/-5 ℃.

(2) Putting the raw materials of lead, bismuth and cadmium in parts by mass into a smelting furnace, adjusting the smelting temperature to 700-;

(3) adjusting the melting temperature to 300-350 ℃, adding the tin raw material with the low relative melting point in parts by mass when the temperature in the melting furnace is reduced to 300-350 ℃, stirring until the tin raw material is completely melted, removing surface skimming, and standing to obtain an alloy hot melt;

(4) filtering the alloy hot melt through a filtering device, casting the alloy hot melt into a casting mold, and cooling the casting mold to room temperature to obtain an alloy ingot, wherein the width of the alloy ingot is 50-100mm, and the thickness of the alloy ingot is 10-30 mm;

(5) machining the alloy ingot, and cutting (laser cutting or linear cutting) the alloy ingot to a required valve core shape (cylinder) and size according to requirements;

(6) carrying out surface treatment on the alloy ingot obtained by cutting in the step (5) to ensure that the metal cylinder is neat in appearance and free of damage and abrasion on the surface;

(7) bagging and warehousing.

Furthermore, the purity of the tin is more than or equal to 99.8 percent, the purity of the lead is more than or equal to 99.8 percent, and the purity of the bismuth is more than or equal to 99.8 percent.

Furthermore, the tin material, the lead material and the bismuth material are blocky and have the size of 22-40mm, and the tin material is spherical and has the diameter of 5-6 mm. For example, the lead material and the bismuth material are blocks with length, width and height in the range of 20-40mm, and specifically, the size may be 22mm, 25mm, 28mm, 30mm, 32mm, 35mm, 38mm or a value range formed by any two of the above numerical points. Compared with powdery raw materials, the blocky raw materials adopted by the invention can avoid the pollution in the processing process of the powdery raw materials; the method can also avoid the problems of more serious oxygen washing and water washing caused by large specific surface area of the powder raw material, and the problems of high oxygen content, more oxidizing impurities generated in later-stage smelting, raw material loss and uneven components, namely, the method has the advantages of less pollution of the bulk raw material, low oxygen content, less oxidizing impurities after smelting, less raw material loss and good component uniformity. In addition, the alloy obtained by the method of mixing raw materials and smelting firstly has better component uniformity, especially when preparing products with larger weight and size. The fast raw materials of the invention are preferably 20-40mm, which is convenient for processing on one hand and simultaneously melting the two raw materials on the other hand, avoids uneven components and can maximize the charging amount of the crucible.

Further, in the step (3), the stirring and melting time is 30-50 minutes, and the standing time is 25-30 minutes.

Further, in the step (3), the alloy hot melt is cooled to 300-400 ℃ along with the furnace, and the cooling along with the furnace is carried out under the vacuum condition, wherein the vacuum degree is 0.1-1 Pa.

Further, electromagnetic stirring is adopted for stirring in the step (3), and is started every 9-12min in the furnace cooling process, wherein the stirring time is 3-5 min each time. The components can be further homogenized by electromagnetic stirring; the electromagnetic stirring is started at intervals to keep the smelting temperature within a certain range. The electromagnetic stirring is carried out in the cooling process, so that the composition segregation in the cooling process can be avoided, and the composition is more uniform.

Further, in the step (4), the filtering device is foamed alumina, and the pore size of the foamed alumina is selected to be 80 meshes.

Further, in the step (5), the machining process adopts a low-hardness material machining process.

Further, in the step (7), the alloy ingots after surface treatment are stacked up and down at intervals by base paper, and then are packed into bags, and then are put in storage.

The invention can realize the following technical effects:

(1) the preparation method of the low-melting-point high-pressure-resistant tin-lead alloy material is simple in process, the whole process can be carried out in an atmospheric environment, the manufacturing cost is low, the operation is easy, and the method is suitable for large-scale popularization and use;

(2) the low-melting-point tin-lead alloy material has higher compressive strength, the temperature range of the melting point of the tin-lead alloy is smaller, the requirement of application in a hydrogen cylinder mouth valve can be met, the tin-lead alloy valve core can be in service for a long time under the condition of hydrogen pressure of 70Mpa, the bottle mouth valve is ensured not to leak in work, and once the hydrogen temperature is too high, the tin-lead alloy valve core can be rapidly melted to release pressure and cool, so that the safety of equipment is protected, and the effect of protection is achieved.

Drawings

Fig. 1 is a metallographic diagram of a valve core obtained by a process for preparing a low-melting-point high-pressure-resistant tin-lead alloy material according to embodiment 1 of the present invention;

fig. 2 is a metallographic diagram of a valve core obtained by a process for preparing a low-melting-point high-pressure-resistant tin-lead alloy material according to embodiment 2 of the present invention;

fig. 3 is a metallographic diagram of a valve core obtained by a process for preparing a low-melting-point high-pressure-resistant tin-lead alloy material according to embodiment 3 of the present invention;

fig. 4 is a compressive stress-strain diagram of the low-melting-point high-pressure-resistant sn-pb alloy material of example 1 of the present invention;

fig. 5 is a compressive stress-strain diagram of the low-melting-point high-pressure-resistant sn-pb alloy material of example 2 of the present invention;

fig. 6 is a compressive stress-strain diagram of the low-melting-point high-pressure-resistant sn-pb alloy material of example 3 of the present invention.

Detailed Description

In order to make the technical means of the present invention and the technical effects achieved thereby clearer and more complete, the following embodiments are provided as detailed descriptions:

example 1

The preparation process of the low-melting-point high-pressure-resistant tin-lead alloy material comprises the following steps:

(1) preparing the following raw materials in parts by mass: 1 part of tin, 30 parts of lead, 40 parts of bismuth and 0.005 part of cadmium; wherein the purity of tin is more than or equal to 99.8 percent, the purity of lead is more than or equal to 99.8 percent, and the purity of bismuth is more than or equal to 99.8 percent. The tin material, the lead material and the bismuth material are blocky and have the size of 22mm, and the cadmium material is spherical and has the diameter of 5 mm.

(2) Putting the raw materials of lead, bismuth and cadmium in parts by mass into a smelting furnace, adjusting the smelting temperature to 700 ℃ for smelting, and stirring and melting;

(3) adjusting the melting temperature to 300 ℃, adding the tin raw material in parts by mass when the temperature in the melting furnace is reduced to 300 ℃, stirring until the tin raw material is completely melted, removing surface layer slag, and standing to obtain an alloy hot melt; the stirring melting time was 30 minutes and the standing time was 25 minutes. The alloy hot melt is cooled to 300 ℃ along with the furnace, and the cooling along with the furnace is carried out under the vacuum condition, and the vacuum degree is 0.1 Pa. Electromagnetic stirring is adopted for stirring, and in the process of cooling along with the furnace, the electromagnetic stirring is started every 9min, and the stirring time is 3min each time.

(4) Filtering the alloy hot melt through 80-mesh foamed aluminum oxide, casting the alloy hot melt into a casting mold, and cooling the casting mold to room temperature to obtain an alloy ingot;

(5) machining the alloy ingot by a low-hardness material machining process, and carrying out laser cutting or linear cutting on the alloy ingot to the shape and the size required by the valve core according to requirements;

(6) carrying out surface treatment on the alloy ingot obtained by cutting in the step (5);

(7) and stacking the alloy ingots subjected to surface treatment up and down at intervals by using base paper, then filling the alloy ingots into bags, and then warehousing the alloy ingots.

Example 2

The preparation process of the low-melting-point high-pressure-resistant tin-lead alloy material comprises the following steps:

(1) preparing the following raw materials in parts by mass: 35 parts of tin, 40 parts of lead, 50 parts of bismuth and 0.015 part of cadmium; wherein the purity of tin is more than or equal to 99.8 percent, the purity of lead is more than or equal to 99.8 percent, and the purity of bismuth is more than or equal to 99.8 percent. The tin material, the lead material and the bismuth material are blocky and have the size of 28mm, and the cadmium material is blocky and has the diameter of 5 mm.

(2) Putting the raw materials of lead, bismuth and cadmium in parts by mass into a smelting furnace, adjusting the smelting temperature to 750 ℃ for smelting, and stirring and melting;

(3) adjusting the melting temperature to 330 ℃, adding the tin raw material in parts by mass when the temperature in the melting furnace is reduced to 330 ℃, stirring until the tin raw material is completely melted, removing surface layer slag, and standing to obtain an alloy hot melt; the stirring melting time was 40 minutes and the standing time was 28 minutes. The alloy hot melt is cooled to 330 ℃ along with the furnace, and the cooling along with the furnace is carried out under the vacuum condition, and the vacuum degree is 0.51 Pa. The stirring adopts electromagnetic stirring, and the electromagnetic stirring is started every 10min in the furnace cooling process, and the stirring time is 4min each time.

(4) Filtering the alloy hot melt through 80-mesh foamed aluminum oxide, casting the alloy hot melt into a casting mold, and cooling the casting mold to room temperature to obtain an alloy ingot;

(5) machining the alloy ingot by a low-hardness material machining process, and carrying out laser cutting or linear cutting on the alloy ingot to the shape and the size required by the valve core according to requirements;

(6) carrying out surface treatment on the alloy ingot obtained by cutting in the step (5);

(7) and stacking the alloy ingots subjected to surface treatment up and down at intervals by using base paper, then filling the alloy ingots into bags, and then warehousing the alloy ingots.

Example 3

The preparation process of the low-melting-point high-pressure-resistant tin-lead alloy material comprises the following steps:

(1) preparing the following raw materials in parts by mass: 5 parts of tin, 45 parts of lead, 60 parts of bismuth and 0.025 part of cadmium; wherein the purity of tin is more than or equal to 99.8 percent, the purity of lead is more than or equal to 99.8 percent, and the purity of bismuth is more than or equal to 99.8 percent. The tin material, the lead material and the bismuth material are blocky and have the size of 40mm, and the cadmium material is spherical and has the diameter of 6 mm.

(2) Putting the raw materials of lead, bismuth and cadmium in parts by mass into a smelting furnace, adjusting the smelting temperature to 800 ℃ for smelting, and stirring and melting;

(3) adjusting the melting temperature to 350 ℃, adding the tin raw material in parts by mass when the temperature in the melting furnace is reduced to 350 ℃, stirring until the tin raw material is completely melted, removing surface layer slag, and standing to obtain an alloy hot melt; the stirring melting time was 50 minutes, and the standing time was 30 minutes. The alloy hot melt is cooled to 400 ℃ along with the furnace, and the cooling along with the furnace is carried out under the vacuum condition, and the vacuum degree is 1 Pa. Electromagnetic stirring is adopted for stirring, and in the process of cooling along with the furnace, the electromagnetic stirring is started every 12min, and the stirring time is 5min each time.

(4) Filtering the alloy hot melt through 80-mesh foamed aluminum oxide, casting the alloy hot melt into a casting mold, and cooling the casting mold to room temperature to obtain an alloy ingot;

(5) machining the alloy ingot by a low-hardness material machining process, and carrying out laser cutting or linear cutting on the alloy ingot to the shape and the size required by the valve core according to requirements;

(6) carrying out surface treatment on the alloy ingot obtained by cutting in the step (5);

(7) and stacking the alloy ingots subjected to surface treatment up and down at intervals by using base paper, then filling the alloy ingots into bags, and then warehousing the alloy ingots.

The metallographic diagrams of the tin-lead alloy valve cores prepared in the above embodiments 1 to 3 of the present invention are respectively shown in fig. 1 to 3, and it can be seen from fig. 1 to 3 that the solidification structure has changed, the eutectic structure has not been obvious, and the distribution is uniform.

The tin-lead alloy valve core prepared in the above embodiments 1 to 3 of the present invention has the following advantages:

the preparation process is simple, the whole process can be carried out in an atmospheric environment, the preparation cost is low, the operation is easy, and the preparation method is suitable for large-scale popularization and use; the low-melting-point tin-lead alloy material has high compressive strength (as shown in figures 4 to 6), the temperature range of the melting point of the tin-lead alloy is small, the requirement of application in a hydrogen cylinder mouth valve can be met, the tin-lead alloy valve core can be in service for a long time under the condition of hydrogen with the pressure of 70Mpa, the cylinder mouth valve is guaranteed not to leak in work, and once the temperature of the hydrogen is too high, the tin-lead alloy valve core can be rapidly melted to release pressure and cool. The safety of the protection equipment plays a role in protection.

The above description is provided for the purpose of further elaboration of the technical solutions provided in connection with the preferred embodiments of the present invention, and it should not be understood that the embodiments of the present invention are limited to the above description, and it should be understood that various simple deductions or substitutions can be made by those skilled in the art without departing from the spirit of the present invention, and all such alternatives are included in the scope of the present invention.