A platinum-sealed container for whole-rock composition testing of rare extraterrestrial samples

Abstract

This utility model patent discloses a platinum-sealed container for whole-rock composition testing of rare extraterrestrial samples, specifically relating to the technical field of extraterrestrial sample analysis equipment. It includes: a platinum-embedded sealing cap with a thickness of 1.0 mm and a diameter of 9.0 mm, featuring a rounded chamfer with a radius of 1.0 mm; a cylindrical body with a length of 1.0 mm and a diameter equal to the outer edge of the cylinder, featuring a rounded chamfer with a radius of 0.2 mm; and a platinum-sealed cavity with an outer diameter equal to the total length of 6.0 mm, a rounded chamfer with a radius of 0.5 mm at the bottom, and a cylindrical cavity with an inner diameter equal to the effective length of 3.0 mm, featuring a rounded chamfer with a radius of 0.3 mm at the bottom. The present invention solves the problems of large sample requirements, volatile element release, and external pollution risk associated with open platinum crucibles in existing high-temperature melting experiments, thereby improving the accuracy of whole-rock composition testing and analysis of extraterrestrial samples.

Description

Technical Field

[0001] This utility model relates to the technical field of extraterrestrial sample analysis equipment, and in particular to a platinum sealed container for whole-rock composition testing of rare extraterrestrial samples. Background Technology

[0002] In the fields of planetary science and astrochemistry, precise testing of the major elemental composition of rare extraterrestrial samples such as lunar soil and meteorites is a key means of revealing the mechanisms of celestial body formation and evolution. The currently widely used high-temperature melting experimental method mainly relies on traditional platinum crucibles as sample processing containers. The standard procedure is as follows: the rock sample is ground into a fine powder (below 200 mesh) and placed in an open platinum crucible, heated to a predetermined high temperature to completely melt it, and then rapidly quenched and cooled to form a glassy state.

[0003] Currently, this method has the following drawbacks: The sample requirement is too large; conventional platinum crucibles typically need to hold hundreds of milligrams to grams of sample, while extraterrestrial samples (such as lunar soil and rare meteorites) are extremely scarce, making it difficult to meet the testing requirements. Furthermore, open crucibles lack sealing, and during the high-temperature melting stage (>1000℃), a large amount of volatile elements (such as K, Na, S, Zn, etc.) will escape into the environment, leading to severe distortion of the composition analysis results. During heating and quenching, the sample is directly exposed to air or cooling media, triggering element exchange (such as oxidation, water vapor adsorption, and impurity infiltration), further reducing the accuracy of the test. Traditional open container designs cannot meet the processing needs of precious samples. Therefore, against this backdrop, after numerous experiments and demonstrations, a platinum interference-sealed container with extremely low sample loss, combined with airtightness and chemical inertness, was designed for whole-rock composition testing of rare extraterrestrial samples, to meet the stringent requirements of whole-rock composition testing of extraterrestrial samples. Utility Model Content

[0004] This invention aims to provide a platinum sealed container for whole-rock composition testing of rare extraterrestrial samples, solving the problems of large sample requirements, volatile element leakage, and external contamination risks associated with open platinum crucibles in existing high-temperature melting experiments.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows: A platinum sealed container for whole-rock composition testing of rare extraterrestrial samples, comprising:

[0006] A platinum-embedded sealing cap, the platinum-embedded sealing cap having a thickness of 1.0 mm and a diameter of 9.0 mm, wherein the outer edge of the platinum-embedded sealing cap has a rounded chamfer with a radius of R = 1.0 mm, and the bottom center of the platinum-embedded sealing cap has a smooth cylinder with a length of 1.0 mm and a diameter of [missing information]. The outer edge of the cylinder is designed with a rounded chamfer of R=0.2mm;

[0007] A platinum-sealed cavity, wherein the outer diameter of the platinum-sealed cavity is... The total length is 6.0 mm. The bottom of the platinum sealing cavity has a rounded chamfer with a radius of R = 0.5 mm. The interior of the platinum sealing cavity has a cylindrical cavity with an inner diameter of [missing information]. The effective length of the cavity is 3.0 mm, the bottom of the cavity has a rounded chamfer with a radius of R = 0.3 mm, and the volume of the cavity is 9.42 mm². 3 .

[0008] The principle and effect of the technical solution: Based on the average density of lunar mare basalt of 3 mg / mm³ 3 The sealed cavity can hold a maximum of 28 mg of lunar soil or extraterrestrial sample powder. Considering the rarity of extraterrestrial samples and the need for uniform sample mixing, 20-30 mg is optimal for whole-rock composition analysis, and the standard is to fill the sealed cavity completely to prevent air from entering and affecting the analysis. Therefore, the volume of the sealed cavity was determined based on the required sample volume.

[0009] Furthermore, the platinum embedded sealing cap and the platinum sealing cavity are made of platinum with a purity of ≥99.95%.

[0010] With the above settings, high-purity platinum has excellent ductility, high melting point (1768℃) and low hardness, which can achieve the airtightness of the sealed cavity. While all the common minerals in extraterrestrial samples, such as olivine, pyroxene and plagioclase, are melted (the highest temperature in the experiment was 1500℃), it remains in a solid state. After the melting experiment is completed, it is convenient to cut and prepare the sample.

[0011] Furthermore, the platinum embedded sealing cap and the platinum sealing cavity are fitted with an interference fit.

[0012] With the above settings, experimental tests show that there is virtually no escape of volatile elements from the sample being tested, greatly improving sample fidelity.

[0013] Furthermore, the maximum interference of the interference fit is 0.01 mm.

[0014] With the above settings, the maximum interference of 0.01 mm is the key design parameter to achieve zero pollution and zero volatilization in the high-temperature melting experiment of extraterrestrial samples. Its technical effect is that platinum has good ductility. Therefore, according to theoretical calculations, the interference of 0.01 mm will generate a contact pressure of 30-50 MPa at the mating surface.

[0015] Furthermore, the platinum embedded sealing cap and the platinum sealing cavity form a tight connection and a secondary mechanical sealing structure through an interference fit, achieving airtight sealing under 1 standard atmosphere.

[0016] With the above setup, the platinum embedded sealing cap and the platinum sealing cavity have an interference fit of 0.01mm. Platinum has good ductility. The primary sealing is achieved by fastening the cap, and the secondary sealing is achieved by using the interference fit to ensure a tight fit between the platinum embedded sealing cap and the platinum sealing cavity under pressure, thus achieving a complete seal. During actual heating, the atmospheric pressure inside the platinum sealing cavity is kept consistent with the external atmospheric pressure, thus achieving an airtight seal at 1 standard atmosphere.

[0017] Compared with existing technologies, the beneficial effects of this solution are:

[0018] 1. This scheme requires minimal extraterrestrial samples; the sample density is 2.8 g / cm³. 3 Under these conditions, only 30 mg of sample is required.

[0019] 2. This design ensures the airtightness of the cavity through interference fit and mechanical sealing structure, preventing high-temperature volatilization of elements and isolating contaminants. Platinum is embedded in the outer edge of the sealing cap and elastically deformed (utilizing the ductility of platinum to achieve a complete seal). It is then bent and wrapped along the top end face of the platinum-sealed cavity, with a bending radius R = 0.50 mm and a bending angle of 90° ± 2°, forming a mechanically self-locking seal. This enhances the sealing effect and promotes the interdiffusion of platinum atoms between the bent area and the cavity surface during subsequent high-temperature heating, promoting high-temperature self-healing and strengthening of the metal, further enhancing the airtightness of the device.

[0020] 3. This solution has strong operational compatibility and can directly replace traditional open crucibles. It is compatible with existing melting furnaces, quenching equipment and subsequent analysis processes. Attached Figure Description

[0021] Figure 1 This is an exploded view of a platinum sealed container for whole-rock composition testing of rare extraterrestrial samples according to this utility model.

[0022] Figure 2 This is a front view of a platinum sealed container used for whole-rock composition testing of rare extraterrestrial samples according to this embodiment;

[0023] Figure 3 This is a top view of the platinum-sealed cavity in this embodiment.

[0024] The reference numerals in the accompanying drawings include: platinum embedded sealing cap 1, platinum sealing cavity 2. Detailed Implementation

[0025] The present invention will be further described in detail below through specific embodiments:

[0026] Example

[0027] like Figures 1 to 3 As shown, a platinum-sealed container for whole-rock composition testing of rare extraterrestrial samples includes:

[0028] A platinum embedded sealing cap 1 has a thickness of 1.0 mm and a diameter of 9.0 mm. The outer edge of the platinum embedded sealing cap 1 has a rounded chamfer with a radius of 1.0 mm. A smooth cylinder with a length of 1.0 mm and a diameter of [missing information] is integrally formed at the bottom center of the platinum embedded sealing cap 1. The outer edge of the cylinder is designed with a rounded chamfer of R=0.2mm.

[0029] Platinum sealing cavity 2, the outer diameter of platinum sealing cavity 2 is The total length is 6.0 mm, and the bottom of the platinum sealing cavity 2 has a rounded chamfer with a radius of R = 0.5 mm. The interior of the platinum sealing cavity 2 has a cylindrical cavity with an inner diameter of [missing information]. The effective length of the cavity (i.e., the height of the cavity after complete sealing) is 3.0 mm, the bottom of the cavity has a rounded chamfer with R = 0.3 mm, and the volume of the cavity is 9.42 mm². 3 .

[0030] In this embodiment, both the platinum embedded sealing cap 1 and the platinum sealing cavity 2 are made of platinum with a purity of ≥99.95%. Furthermore, the platinum embedded sealing cap 1 and the platinum sealing cavity 2 are fitted with an interference fit, with a maximum interference amount of 0.01 mm.

[0031] The platinum embedded sealing cap 1 and the platinum sealing cavity 2 form a tight connection and a secondary mechanical seal structure through an interference fit, achieving an airtight seal under 1 standard atmosphere.

[0032] The working process of this embodiment is as follows:

[0033] Approximately 30 mg of rare extraterrestrial sample powder is loaded into the cylindrical cavity of the platinum sealed chamber 2. The cylinder of the platinum embedded sealing cap 1 is aligned with the top opening of the platinum sealed chamber 2, and a vertical pressing force is applied along the axial direction. This causes the platinum embedded sealing cap 1 and the platinum sealed chamber 2 to form a tight connection between the mating surfaces through radial elastic deformation generated by the interference fit. Then, the outward extension of the platinum embedded sealing cap 1 is bent and wrapped along the platinum sealed chamber 2 to form a secondary mechanical seal, ensuring the airtightness of the container under one standard atmosphere.

[0034] The above are merely embodiments of this utility model. Commonly known structures and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A platinum-sealed container for the whole-rock composition testing of rare extraterrestrial samples, characterized by, Comprise: A platinum embedded sealing cap (1) has a thickness of 1.0 mm and a diameter of 9.0 mm. The outer edge of the platinum embedded sealing cap (1) has a rounded chamfer with a radius of R=1.0 mm. A smooth cylinder with a length of 1.0 mm and a diameter of 9.0 mm is located at the center of the bottom of the platinum embedded sealing cap (1). mm, the outer edge of the cylinder is designed with a rounded chamfer of R=0.2mm; A platinum sealing cavity (2) has an outer diameter of Ø4.0mm and a total length of 6.0mm. The bottom of the platinum sealing cavity (2) has a rounded chamfer with R=0.5mm. The interior of the platinum sealing cavity (2) has a cylindrical cavity with an inner diameter of Ø. The cavity has an effective length of 3.0 mm, a bottom chamfer of R=0.3 mm, and a volume of 9.42 mm². 3 .

2. The platinum sealed container for the whole rock composition test of the rare extraterrestrial sample according to claim 1, characterized in that: The material of the platinum embedded sealing cover (1) and the platinum sealing cavity (2) is platinum with purity ≥ 99.95%.

3. The platinum sealed container for the whole rock composition test of rare extraterrestrial samples according to claim 1, characterized in that: The platinum embedded sealing cover (1) and the platinum sealing cavity (2) adopt interference fit.

4. The sealed platinum container for the whole rock composition testing of rare extraterrestrial samples according to claim 3, characterized in that: The maximum interference of the interference fit is 0.01 mm.

5. The sealed platinum container for the whole rock composition testing of rare extraterrestrial samples according to claim 1, characterized in that: The platinum embedded sealing cover (1) and the platinum sealing cavity (2) form tight connection and secondary mechanical sealing structure through interference fit, and realize air-tight sealing under 1 standard atmosphere.

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