Test method for thermal conductivity of metal alloys

The thermal conductivity testing of metals is an important technology in materials science, which is crucial for enterprises to evaluate the thermal conductivity of materials and optimize their use in products. The measurement of metal thermal conductivity has broad application and development prospects in fields such as energy and construction. Thermal conductivity refers to the amount of heat that passes through a unit area per unit time, and is an important criterion for measuring the thermal conductivity of materials.

There are many methods for testing the thermal conductivity of metals, among which the common ones are the hot plate method, heat flux meter method, and heat source method. We used a thermal conductivity meter developed using transient planar heat source technology (TPS) for metal thermal conductivity testing. Compared to other measurement methods, the transient heat source method has faster measurement speed, wider measurement range, and more convenient and efficient operation.

　　1、 Experimental principles and equipment　

The transient plane heat source method is an accurate and fast method for studying thermal conductivity. It is a new technology that can quickly and accurately measure thermal conductivity when studying materials. This method uses a planar probe with a double helix structure, which is etched from a thermal resistant material to form a planar probe that serves as both a heat source and a temperature sensor. During the testing process, the probe will be placed in the middle of the sample for testing. When the current passes through the probe, a certain temperature rise will occur, and a certain voltage change will be generated on the probe. The temperature generated will undergo thermal diffusion through the sample above and below the probe, and the diffusion speed depends on the thermal conductivity of the sample. How to analyze and process the collected data through the upper computer digital model software to calculate the thermal conductivity.

The experimental equipment used in this experiment is DZDR-S produced by Nanjing Dazhan Testing InstrumentThermal conductivity tester(As shown in Figure 1-1 below)

This experiment mainly includes the host, the sample to be tested (alumina block), the probe, and the data acquisition software.

　　2、 Experimental steps and operations

1. Open the experimental equipment and perform equipment adjustments and preparation work.

2. Place the probe in the middle of the sample and clamp the sample to be tested with a fixture, ensuring that the probe is placed at the center of the sample (as shown in Figure 1-2 below).

3. Set the device interface, including time, probe resistance, power, and reference

4. Open the upper computer analysis software for data connection and fill in the relevant parameters such as resistance and power. Click to start testing and wait for the host buzzer to sound. Click on the software to analyze the thermal conductivity (as shown in Figure 1-3).

After waiting for 10 minutes after the test is completed, wait for the sample and probe to cool down, and repeat the above steps for repeatability testing.

Figure 1-1

Figure 1-2

Figure 1-3

　　3、 Result analysis

Through this experiment, we found that the thermal conductivity of alumina is 150.36W/mK, and the thermal diffusion coefficient is 98m ²/s. And some key factors affecting thermal conductivity were preliminarily analyzed. The experimental results indicate that, in terms of internal environment, the thermal conductivity of metals is closely related to factors such as their internal structure and impurity composition. In terms of external environment, the experimental process may also be affected by external factors such as temperature fluctuations, air environment fluctuations, etc. These unstable factors will all affect the results of the test.

　　4、 Conclusion Discussion

In summary, this experiment explores the thermal conductivity and influencing factors of metal alloys through actual measurement and analysis, providing accurate data references for a deeper understanding of metal thermal conductivity mechanisms and measurement of thermal conductivity. By continuously improving and optimizing measurement methods, we may gain a more accurate understanding of the thermal conductivity of metal alloys, providing valuable insights for the development of industrial production fields such as materials science and chemical industry.