1. Testing items

Purity test: The purity of boron nitride directly affects its performance. Whether it is hexagonal boron nitride or cubic boron nitride, the impurity content must be accurately measured, such as other metal impurities or non-metallic impurities other than boron and nitrogen. High-purity boron nitride can ensure stable and reliable operation in high-precision fields such as electronics and aerospace. Excessive impurities may cause its key properties such as thermal conductivity and hardness to be greatly reduced.

Crystal structure detection: In view of the different uses of boron nitride with different crystal structures, it is necessary to use technical means such as X-ray diffraction to clearly identify whether it is hexagonal or cubic, as well as the integrity and lattice parameters of the crystal. Accurate crystal structure information is of great significance in determining whether boron nitride can be adapted to specific industrial processing or heat dissipation lubrication and other application scenarios.

Performance index detection: For hexagonal boron nitride, the focus is on detecting its lubrication performance. By simulating high temperature and high pressure friction environment, the friction coefficient is measured to evaluate its advantages and disadvantages as a lubricant; for cubic boron nitride, the focus is on detecting hardness. Hardness testing instruments are used to compare with standard hardness materials to ensure that it meets the hardness requirements of cutting and grinding. At the same time, thermal conductivity detection is also indispensable. The potential of boron nitride in heat dissipation applications is considered using heat flow meter method, etc.

2. Detection method

Chemical analysis method: Use chemical titration, colorimetric analysis and other methods to accurately determine the impurity components and content in boron nitride. This method is more accurate for the analysis of trace elements and can provide a strong basis for purity judgment.

Physical detection method: As mentioned above, X-ray diffraction is used for crystal structure analysis; atomic force microscopy is used to observe the microscopic morphology of boron nitride to understand its physical characteristics such as particle size and surface flatness, and assist in judging product quality.

Simulated working condition test method: build a test platform that simulates actual working scenes such as high temperature and high load, so that the boron nitride samples can be "tested" in it, and directly obtain its performance data in the real use environment, such as lubricity and wear resistance.

3. Testing standards

International standards focus on the universality of the global industry, and stipulate the specifications of boron nitride in basic performance, safety, etc., which facilitates cross-border trade and technical exchanges; national standards refine purity classification, application classification and other standards based on the development needs of the country's industry, and guide domestic enterprises to produce; industry standards are formulated by relevant professional associations, and strict and targeted testing indicators are customized for the special requirements of different industries such as aerospace, electronic semiconductors, etc., to ensure the quality of special boron nitride products in various industries.

4. Significance of testing

For production enterprises, strict testing promotes process improvement and quality improvement, creates internationally competitive brands, and stands out in the market; for scientific research units, accurate testing helps to deeply understand the characteristics of boron nitride and provide data support for the development of new applications; and consumers will eventually benefit from using boron nitride products with excellent performance and reliable quality, and promote the entire boron nitride industry to develop towards higher quality and broader prospects.

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