Ceramics is an important cultural heritage and daily necessities, and its production and testing history can be traced back thousands of years to ancient China. However, with the development of science and technology and the continuous improvement of people's requirements for ceramic quality and performance, the traditional artificial ceramic detection method is easily affected by the visual fatigue and subjective factors of the inspectors, and it is difficult to ensure the accuracy and stability of the detection, and it has been difficult to meet the needs of modern industry and art.
The specific goal of non-destructive testing of ceramic materials is to detect defects such as cracks, porosity, agglomeration, and inclusions that are unfavorable to performance. The difficulty lies in the fact that the defects to be detected are extremely small, so the difficulty is relatively high. At present, there are several commonly used methods to detect ceramic defects, and this article mainly introduces the use of infrared thermal imaging cameras for non-destructive testing of ceramics.
In infrared thermal imaging non-destructive testing, heat is transferred inside an object when it is thermally excited. When there is a defect inside the object, the thermal conductivity of the surface of the object is changed, and the change in the thermal conductivity will cause a change in the heat distribution, resulting in a difference in the temperature of the surface of the object. By measuring the infrared emission energy on the surface of the ceramic material, the surface temperature distribution is converted into a thermal imaging map, and the temperature distribution of the thermal imaging image can be used to determine whether there are defects in the tested sample and the existence of defects.
Advantages of infrared thermal imaging inspection of ceramic non-destructive testing:
It responds quickly to temperature changes, has high sensitivity, accurate temperature measurement and fast detection speed.
Easy to use and simple to operate.
The non-contact temperature measurement method does not cause any damage to the ceramic.
Test results are immediately visible and can be viewed by staff at any time.
The temperature data of infrared thermal imaging can be automatically saved for staff to view and analyze.
Disadvantages of infrared thermal imaging detection of ceramic non-destructive testing:
1. Affected by the surface and background radiation of the product.
2. Sensitivity is affected by the size and depth of defects, 3. The size and shape of defects cannot be determined very accurately.
Infrared thermal imager for ceramic non-destructive testing has the advantages of non-contact, fast and accurate, and will be more and more widely used with the development of infrared thermal imaging nondestructive testing technology.