On March 5, the international invention patent “Method and apparatus for testing residual stress in coatings” applied for through the Patent Cooperation Treaty (PCT) by Professor Bao Yiwang's team at the Central Research Institute of CTC was authorized in the United States, with Patent No. US 10222343B2. This is also the first international invention patent authorized for CTC.

This patented technology is based on a breakthrough achievement made by the team of Professor Bao Yiwang, Chief Scientist of CTC, in the field of coating mechanical property evaluation—the relative method theory. Based on this theory, not only was a coating residual stress testing method established, but a multifunctional coating mechanical property testing system was also developed and designed, achieving a breakthrough in solving the international challenge of residual stress testing for coating materials.

This patented technology has extremely wide applications, such as in petrochemicals, defense and military industries, aerospace, machinery and electronics, and other fields. It can accurately evaluate the residual stress of CVD ceramic coatings and is of great significance for ensuring the safety and reliability of components in service.

In recent years, Professor Bao Yiwang has led the team in carrying out innovative work in the field of coating mechanical property evaluation, successfully achieving the evaluation of properties such as coating elastic modulus at room and high temperatures, strength, interfacial bonding strength, thermal expansion coefficient, density, and residual stress. Some new testing technologies have also been successfully transformed into international standards for promotion and application at home and abroad, providing effective testing means for the design and reliability evaluation of ceramic coating materials.

This patent authorization marks an important step by CTC in technological innovation and the internationalization of independent intellectual property rights, greatly enhancing CTC's industry influence. At the same time, it is of great significance for China's patented testing technologies for inorganic non-metallic materials to go abroad and enter the world.