Recently, the international standard ISO 5722:2023 “Fine ceramics (advanced ceramics, advanced technical ceramics) — Test method for determining tensile and shear creep of ceramic adhesive,” led by CTC, was officially released. Its Chinese title is “Fine Ceramics (High-Performance Ceramics, High-Tech Ceramics) — Test Method for Tensile and Shear Creep of Ceramic Adhesives.” This is the 14th international standard led and successfully published by CTC.

Ceramics and metals, and ceramics and ceramics, are usually bonded together with adhesives. When subjected to tensile or bending loads (such as self-weight and externally applied constant loads), the applied constant stress will cause creep in the adhesive between them, leading to deformation failure of the adhesive. Therefore, creep is one of the important properties of ceramic adhesives, and how to measure the creep performance of ceramic adhesives is an urgent task to be solved. ISO 5722 establishes a standard test method for evaluating the tensile and shear creep of ceramic adhesives using the cross-cross method, which can be used to determine the creep performance of adhesives for joining ceramic components.

ISO 5722 was successfully approved as a project in November 2020. After nearly three years, through round-robin comparative tests by research institutions in multiple member countries of the working group, repeated discussions at multiple international meetings and more than one hundred email exchanges, the working group analyzed the feedback from peer experts and revised the standard text, and the standard was finally unanimously recognized. ISO 5722 is another case of technical standardization by the Wan Detian team of the Central Research Institute of CTC. It effectively solves the long-standing technical problem that the tensile and shear creep of ceramic adhesives could not be tested, and has important practical significance for the service safety and optimized design of ceramic bonded components.

CTC has always attached great importance to international standardization work. The successful publication of this international standard further enhances China's international discourse power, effectively improves CTC's scientific and technological influence, innovation capability, and core competitiveness, and adds new momentum to the high-quality and healthy development of CTC in standard formulation.