Electrode paste flow coefficient testing method

Abstract

The invention discloses a method for testing the flow coefficient of electrode paste. The method comprises the following steps: crushing and screening an electrode paste sample to be tested to a specified particle size range; loading the screened electrode paste sample into a conical container with a standard-size discharge hole; placing the conical container in a constant-temperature heating device, heating the conical container to a preset temperature, and keeping the temperature for a constant time; enabling the electrode paste to flow out from the discharge hole under the action of gravity, and spreading the electrode paste on the bearing support plate to form a cake shape; and measuring the diameter of a cake formed by the effluent, and calculating the ratio of the diameter to the diameter of the discharge port as a flow coefficient. By quantitatively evaluating the high-temperature flow characteristics of the electrode paste, a reliable basis is provided for production quality control of the electrode paste, and the method is easy and convenient to operate, good in reproducibility and high in practicability and has a wide application prospect.

Description

Technical Field

[0001] This invention relates to the field of carbon materials technology, and in particular to a method for testing the flow coefficient of electrode paste. Background Technology

[0002] Electrode paste is a paste-like carbon material used in the production of self-baking electrodes. Its flow properties (or "plasticity") during heating are key indicators determining its performance and the quality of the self-baking electrode. Good flowability ensures that the electrode sintersties densely and without cracks during the baking process, resulting in uniform conductivity. However, the industry currently lacks a standardized, unified, easy-to-operate, and reproducible method to quantitatively evaluate the high-temperature flow characteristics of electrode paste.

[0003] Traditional methods rely heavily on experience and lack objective quantitative data, making it difficult to accurately control production processes and product quality. Therefore, there is an urgent need for a method and dedicated device that can accurately and quickly determine the flow coefficient of electrode paste. Summary of the Invention

[0004] This invention provides a method for testing the flow coefficient of electrode paste to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: The method for testing the flow coefficient of electrode paste includes the following steps: The electrode paste sample to be tested is crushed and sieved to the specified particle size range; The sieved electrode paste sample is loaded into a conical container with a standard-sized outlet. Place the conical container in a constant temperature heating device, heat it to the preset temperature and maintain it for a constant time; The electrode paste flows out from the outlet under the action of gravity and spreads on the receiving plate to form a cake shape; Measure the diameter of the cake formed by the effluent and calculate its ratio to the diameter of the discharge port as the flow coefficient.

[0006] As a further improvement to this technical solution: the specified particle size range is 20-40mm.

[0007] As a further improvement to this technical solution: the preset temperature is 250±10℃, and the constant time is 30±1 minutes.

[0008] As a further improvement to this technical solution: the inner diameter of the discharge port of the cone-shaped device is 50mm.

[0009] As a further improvement to this technical solution: the flow coefficient F is calculated using the following formula: F = Dcp / d, ​​where Dcp is the average diameter of the effluent cake and d is the inner diameter of the discharge port. This invention also provides a dedicated testing apparatus for testing the flow coefficient of electrode paste, comprising: A conical container for holding electrode paste samples, with a standard-sized circular outlet at the bottom; Container support, used to support conical containers to maintain a gap between the bottom discharge port and the receiving plate; The receiving tray, placed horizontally, is used to receive the electrode paste flowing out of the conical container; The constant temperature heating device provides a uniform heating environment and controls the internal temperature within a preset range.

[0010] As a further improvement to this technical solution: the conical container is made of stainless steel and has a volume of approximately 150 cm³. 3 .

[0011] As a further improvement to this technical solution: the constant temperature heating device is an electric drying oven, and the internal temperature can be precisely controlled within the range of 250±5℃.

[0012] As a further improvement to this technical solution, it also includes a measuring tool for measuring the diameter of the cake formed by the effluent, wherein the measuring tool is a vernier caliper with an accuracy of 0.1 mm.

[0013] Compared with the prior art, the beneficial effects of the present invention are: This invention provides a reliable basis for the production quality control of electrode paste by quantitatively evaluating its high-temperature flow characteristics. The method is simple to operate, has good reproducibility, and is highly practical, with broad application prospects.

[0014] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it according to the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Specific embodiments of the present invention are given in detail below with reference to the accompanying drawings. Attached Figure Description

[0015] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the electrode paste flow coefficient testing method proposed in this invention; Figure 2 This is a schematic diagram of the dedicated testing device for the electrode paste flow coefficient testing method proposed in this invention.

[0016] The attached diagram lists the components represented by each number as follows: 1. Conical container; 2. Container support; 3. Support plate; 4. Constant temperature heating device. Detailed Implementation

[0017] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are for illustrative purposes only and are not intended to limit the scope of the invention. The invention is described more specifically in the following paragraphs by way of example with reference to the accompanying drawings. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0018] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0019] Please see Figures 1-2 This invention provides a method for testing the flow coefficient of electrode paste, comprising the following steps: Sample preparation: The electrode paste sample to be tested is crushed and sieved to a particle size range of 20-40 mm to ensure that the sample particles are uniform in size.

[0020] Sample loading: Gently load 150±1g of the sieved electrode paste sample into a standard conical container. The bottom of the conical container has a circular outlet with an inner diameter of 50mm to control the outflow of molten material.

[0021] Heating, melting, and flow-out: The conical container containing the sample is placed in an electric drying oven preheated to 250±10℃ and maintained at that temperature for 30±1 minutes. During this process, the electrode paste melts under heat and flows out from the outlet at the bottom of the container under gravity, spreading out on the receiving plate placed below the container.

[0022] Cooling and Measurement: After heating, remove the entire device and allow it to cool naturally to room temperature in the air, allowing the outflowing electrode paste to solidify into a cake shape. Use a vernier caliper with an accuracy of 0.1 mm to measure the diameter of the solidified paste cake in at least two mutually perpendicular directions on its plane, and calculate its average diameter Dcp.

[0023] Calculate the flow coefficient: The flow coefficient F of the electrode paste is calculated using the following formula: F = Dcp / d, ​​where d is the inner diameter of the outlet of the standard conical container (d = 50 mm in this embodiment). The calculation result is usually retained to two decimal places.

[0024] The present invention also provides a dedicated testing apparatus for implementing the above method, comprising: Conical Container 1: Made of stainless steel, with a volume of approximately 150 cm³. 3 The bottom center has a circular discharge port with an inner diameter of 50mm, which is used to hold the sample and control the outflow of molten material.

[0025] Container support 2: Used to support the conical container, so that there is a certain gap between the bottom outlet and the receiving plate, which facilitates the outflow and spread of molten material.

[0026] Receiving tray 3: A smooth, flat stainless steel plate, placed horizontally, used to receive the molten electrode paste flowing out of the conical container and spreading out.

[0027] Constant temperature heating device 4: such as an electric drying oven, whose internal temperature can be precisely controlled within the range of 250±5℃, providing a uniform heating environment for the combination of conical container, support and tray.

[0028] The working principle of this invention is: A circular outlet with a diameter of 50 mm is located at the center of the bottom of the conical container 1. During testing, the electric drying oven is first heated and kept at a constant temperature of 250℃. 150±1 g of the pre-prepared electrode paste sample with a particle size of 20-40 mm is weighed and gently placed into the conical container 1. The entire testing unit (receiving plate 3, container support 2, and conical container 1 containing the sample) is then quickly and smoothly moved into the drying oven, and timing begins. After heating at 250±10℃ for 30 minutes, the testing unit is removed and allowed to cool to room temperature in air. At this point, the molten electrode paste has solidified on the receiving plate 3, forming a nearly circular paste cake. Using a vernier caliper with an accuracy of 0.1 mm, the diameters D1, D2, D3, and D4 are measured on the paste cake in two approximately perpendicular directions (e.g., X and Y directions), and their arithmetic mean is calculated as Dcp. The flow coefficient of the sample is then F = Dcp / 50. By testing different batches and formulations of electrode paste, its flow coefficient can be obtained, thereby accurately comparing and evaluating its high-temperature plasticity properties and providing a reliable basis for production quality control.

[0029] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Those skilled in the art can readily implement the present invention based on the accompanying drawings and the above description. However, any modifications, alterations, or variations made by those skilled in the art without departing from the scope of the present invention, utilizing the disclosed technical content, are equivalent embodiments of the present invention. Furthermore, any modifications, alterations, or variations made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the present invention.

Claims

1. A method for testing the flow coefficient of electrode paste, characterized in that, Includes the following steps: The electrode paste sample to be tested is crushed and sieved to the specified particle size range; The sieved electrode paste sample is loaded into a conical container with a standard-sized outlet. Place the conical container in a constant temperature heating device, heat it to the preset temperature and maintain it for a constant time; The electrode paste flows out from the outlet under the action of gravity and spreads on the receiving plate to form a cake shape; Measure the diameter of the cake formed by the effluent and calculate its ratio to the diameter of the discharge port as the flow coefficient.

2. The method for testing the flow coefficient of electrode paste according to claim 1, characterized in that, The specified particle size range is 20-40 mm.

3. The method for testing the flow coefficient of electrode paste according to claim 2, characterized in that, The preset temperature is 250±10℃, and the constant time is 30±1 minutes.

4. The method for testing the flow coefficient of electrode paste according to claim 3, characterized in that, The inner diameter of the discharge port of the cone-shaped device is 50mm.

5. The method for testing the flow coefficient of electrode paste according to claim 4, characterized in that, The flow coefficient F is calculated using the following formula: F = Dcp / d, ​​where Dcp is the average diameter of the effluent cake and d is the inner diameter of the discharge port.

6. A dedicated testing apparatus for implementing the electrode paste flow coefficient testing method according to any one of claims 1-5, characterized in that, include: A conical container (1) is used to hold electrode paste samples and has a standard-sized circular outlet at the bottom. Container support (2) is used to support the conical container so that there is a gap between its bottom outlet and the receiving plate; The receiving tray (3) is placed horizontally to receive the electrode paste flowing out of the conical container; The constant temperature heating device (4) provides a uniform heating environment and controls the internal temperature within a preset range.

7. The dedicated testing apparatus for the electrode paste flow coefficient testing method according to claim 6, characterized in that, The conical container (1) is made of stainless steel and has a volume of approximately 150 cm³. 3 .

8. The dedicated testing apparatus for the electrode paste flow coefficient testing method according to claim 7, characterized in that, The constant temperature heating device (4) is an electric drying oven, and the internal temperature can be precisely controlled within the range of 250±5℃.

9. The dedicated testing apparatus for the electrode paste flow coefficient testing method according to claim 8, characterized in that, It also includes a measuring tool for measuring the diameter of the cake formed by the effluent, said measuring tool being a vernier caliper with an accuracy of 0.1 mm.

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