Carbon material sample preparation mold

Abstract

The utility model provides a carbon material sample preparation mould which comprises an upper mould plate with a boss, a middle mould and a lower mould plate with a thin groove, the middle mould is formed by connecting and combining four composition plates with the same shape through bolts, a sample cavity is formed in the middle, threads matched with the bolts are arranged on the composition plates, the edge of the middle mould is provided with the groove, and the lower mould plate is provided with the thin groove. The boss of the upper die plate is matched with the middle die in shape and size, pressure is provided for materials through the upper die plate during die assembly, and two thin grooves are symmetrically formed in the two sides of the center line of the lower die plate and used for guiding gas. The mold is simple in design and easy to machine, materials are compacted by applying pressure through the upper mold plate, pores generated in a sample in the heating process are reduced, the density of the sample can be effectively improved, and after the sample is formed, the sample can be smoothly demolded by unscrewing the bolts and detaching the four combined plates.

Description

Technical Field

[0001] The utility model belongs to the field of mold machinery manufacturing, and in particular relates to a carbon material sample preparation mold. Background Art

[0002] Carbon materials are non-metallic materials primarily composed of carbon. The diverse composition and structure of carbon give these materials a wide variety of forms and excellent overall properties. Examples include diamond, flake graphite, graphene, carbon nanotubes, fullerenes, carbon fibers, carbon-carbon composites, and specialty graphites. Due to their excellent mechanical, thermal, and electrical properties, among other comprehensive properties, carbon materials are widely used in machinery manufacturing, electronics, aerospace, nuclear energy, and other fields.

[0003] During the development of carbon materials, it is often necessary to prepare block samples of a certain thickness. Since the sample preparation is carried out at high temperature, a certain amount of gas will be generated during the process. Thicker samples are difficult to discharge the gas, and the gas accumulates inside the sample to form pores, resulting in low sample performance. No matter how the formula is adjusted, it is difficult to process a sample that meets the requirements of subsequent experiments. At the same time, under the action of the melting of the raw materials and the thermal expansion of the metal mold material, the sample often sticks to the mold and cannot be removed. The mold for preparing carbon material samples with a certain thickness needs to fully consider issues such as temperature, pressure, gas decomposition, porosity, density, and uniformity. Through reasonable design, the prepared sample can be experimentally researched. Utility Model Content

[0004] The utility model provides a carbon material sample preparation mold, which fully considers the raw material and process characteristics of the carbon material, can make the sample densified, less pores, uniform in structure, without damage, and easy to unload, and the prepared sample can meet the needs of experimental research.

[0005] The main technical solution of the utility model is a carbon material sample preparation mold, which consists of an upper template (1) with a boss (11), an intermediate mold (2) and a lower template (3) with fine grooves. The intermediate mold is composed of four combination plates (21) of the same shape connected by bolts (22) to form a rectangular or square sample cavity (24). The combination plates are provided with threads matching the bolts. The edge of the intermediate mold has a groove (23) for applying force when disassembling the mold. The shape and size of the boss of the upper template match those of the intermediate mold. When the mold is closed, pressure is provided to the material through the upper template. The lower template (3) is symmetrically provided with two fine grooves (31) on both sides of the center line for ventilating gas.

[0006] Furthermore, the height of the upper template boss (11) is 1 / 4 to 1 / 2 of the height of the middle mold (2). When preparing the sample, the sample fills the middle mold, the upper template is closed, and the upper template boss enters the sample cavity of the mold. The sample melts after being heated and generates gas. At this time, the upper template boss gradually descends automatically under the action of its own gravity. The pressure applied by the upper template densifies the material while removing the gas and reducing the porosity.

[0007] Furthermore, the upper mold plate boss (11) is rectangular or square, and the four sides are 1 to 2 mm shorter than the sides of the corresponding intermediate mold sample cavity (24). That is, after the mold is closed, a certain gap is left between the boss and the edge of the sample cavity to prevent the metal mold from being squeezed and stretched due to thermal expansion, making it difficult for the upper mold plate to move downward and unable to apply pressure, and also facilitating subsequent demolding and sample removal.

[0008] Furthermore, the two fine grooves on the lower template have a width of 2mm to 6mm. The fine grooves must exist in the material area. The fine grooves connect the sample mold with the external atmosphere, providing a discharge channel for gas and a small amount of material, to prevent the molten material from being squeezed into various gaps when subjected to mold closing pressure, causing mold contamination and hindering sample disassembly.

[0009] Furthermore, the mold is made of a metal material with a smooth surface. When preparing the sample, a layer of grease is applied to the surface of the mold that contacts the sample to ensure that the sample surface is smooth and does not adhere to the mold surface, thereby preventing damage to the sample. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the upper template of the utility model.

[0011] Figure 2 It is a schematic diagram of the intermediate mold of the present utility model.

[0012] Figure 3 It is a schematic diagram of the lower template of the utility model.

[0013] Wherein: 1-upper template; 11-upper template boss;

[0014] 2-middle mold; 21-combination plate; 22-bolt connection; 23-groove; 24-sample cavity;

[0015] 3-lower template; 31-fine groove of lower template. DETAILED DESCRIPTION

[0016] The following describes and illustrates a usage mode of the present invention in conjunction with the accompanying drawings. A carbon material sample preparation mold includes an upper template (1) with a boss (11), an intermediate mold (2) and a lower template (3) with a fine groove. The intermediate mold is composed of four combination plates (21) of the same shape connected by bolts (22). The combination plates are provided with threads matching the bolts. The sample cavity is 4.5 cm high, and the length and width are both 4 cm. The boss is 1.5 cm high, and the length and width are both 3.8 cm. The edge of the intermediate mold has a groove (23) for applying force when disassembling the mold. The shape and size of the boss of the upper template match those of the intermediate mold. When the mold is closed, pressure is provided to the material through the upper template. The lower template (3) is symmetrically provided with two fine grooves (31) on both sides of the center line, with a width of 4 mm, for guiding gas and a small amount of material.

[0017] Each template component is coated with a layer of grease. The lower template is placed horizontally. The four templates of the middle mold are assembled and placed on the lower template. The raw materials are ground into fine particles with a particle size of about 300 microns. The material, which has been evenly mixed in a blender, is placed into the sample cavity of the middle mold. The material is compacted until the entire sample cavity is filled. The upper template is closed so that the boss of the upper template fits exactly with the opening of the middle mold. The entire mold is transferred to the heat treatment equipment for sample preparation. As the temperature rises, the sample in the mold gradually melts and decomposes into gas. Under the pressure of the upper template, the material moves to fill the previous gaps. The sample gradually becomes dense and the gas is discharged at the same time to avoid the formation of pores in the sample. After the heat treatment is completed, the temperature is lowered and the mold is removed. After the temperature drops below 50°C, the connecting bolts of the middle mold are unscrewed, the mold is disassembled, and the sample is removed for subsequent testing.

[0018] The above are only preferred embodiments of the present invention, not all embodiments. Equivalent replacements and improvements made by industry technicians without departing from the concept of the present invention should also be within the scope of protection of the present invention.

Claims

1. A carbon material sample preparation mold, characterized by: The invention comprises an upper template (1) with a boss (11), an intermediate mold (2) and a lower template (3) with a fine groove. The intermediate mold is composed of four combination plates (21) of the same shape connected by bolts (22) to form a rectangular or square sample cavity (24). The combination plates are provided with threads matching the bolts. The edge of the intermediate mold has a groove (23) for applying force when the mold is disassembled. The shape and size of the boss of the upper template match those of the intermediate mold. When the mold is closed, pressure is applied to the material through the upper template. The lower template (3) is symmetrically provided with two fine grooves (31) on both sides of the center line for ventilating gas.

2. A carbon material sample preparation mold according to claim 1, characterized in that: The height of the upper template boss (11) is 1 / 4 to 1 / 2 of the height of the middle mold (2).

3. A carbon material sample preparation mold according to claim 1, characterized in that: The upper mold plate boss (11) is rectangular or square, and the dimensions of the four sides are 1 to 2 mm shorter than the dimensions of the corresponding sides of the middle mold sample cavity (24).

4. A carbon material sample preparation mold according to claim 1, characterized in that: The two fine grooves (31) on the lower template have a width of 2 mm to 6 mm. The fine grooves should exist in the material area to provide a discharge channel for gas and a small amount of material.

5. A carbon material sample preparation mold according to claim 1, characterized in that: Its material is metal material with smooth surface.

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