Thermal conductivity tester is an important tool for measuring the thermal conductivity of materials. The accuracy of its test results directly affects the effectiveness of material performance evaluation and subsequent applications. In order to ensure the authenticity and reliability of the test results, verification can be carried out in the following ways:
1. Standard sample comparison: Use standard reference materials with known thermal conductivity for comparative tests, such as copper blocks, glass, polystyrene, etc., and compare the test results with literature values or national standard data. If the measured value is consistent with the recognized value, it means that the instrument is operating well and the results are reliable.
2. Repeated tests: Perform multiple repeated tests, calculate the average value and standard deviation, and observe the consistency and stability of the data. A good tester should give stable results with small deviations.
3. Cross-validation of different methods: If conditions permit, try to use other types of thermal conductivity testers (such as hot wire method, heat flow meter method) to test the same material and compare the results. Although there will be slight differences between different methods, the overall trend should be consistent.
4. Environmental condition control: Ensure that the temperature, humidity and other conditions of the test environment meet the requirements to avoid external factors interfering with the test results. Standardized tests should be carried out in a specified environment and in accordance with relevant standards such as ISO and ASTM.
5.Instrument calibration: Regularly calibrate the thermal conductivity tester to check whether it is in the best working condition. The calibration certificate provided by the manufacturer or the third-party calibration service can effectively ensure the accuracy of the instrument.
6. Technical document review: Carefully read and follow the instrument operating instructions to ensure that each test step is strictly carried out in accordance with the regulations. Any deviation from the standard procedure may cause errors.
7. Training and qualifications: Ensure that the operator has received adequate training and understands the instrument principles and operating skills. People who are not properly trained are prone to make mistakes, which affects the accuracy of the test.
8. Consult expert opinions: When encountering uncertain situations, you may wish to consult professionals or instrument suppliers. They have rich experience and knowledge and can provide valuable advice and solutions.
In addition to the above methods, keeping the thermal conductivity tester well maintained and updated in time is also an important part that cannot be ignored. Only by comprehensively considering and strictly implementing various measures can we ensure that each test is true and reliable, providing a solid foundation for scientific research, production and quality management. In practical operations, a complete testing system should be formed to continuously improve the testing level and promote the development of materials science and technology.