Chinese silicon nitride industry

The Chinese silicon nitride industry has achieved a leapfrog upgrade from 'material substitution' to 'standard leadership' under the empowerment of 5G, with core breakthroughs focused on the localization of high thermal conductivity ceramic substrates and RF packaging structures. Silicon nitride (Si ∝ N ₄), with a thermal conductivity of 120W/(m · K) and a thermal expansion coefficient of 3.2 × 10 ⁻⁶/℃, is perfectly matched with silicon chips and has become the preferred packaging substrate for 5G base station millimeter wave filters and GaN RF power modules. Its heat dissipation efficiency is 5 times higher than traditional alumina, the chip junction temperature is reduced by 45 ° C, and the base station power consumption is reduced by 30%. The national standard for 'Silicon Nitride Ceramic Substrate' (GB/T 45776-2025) led by China National High tech Materials Corporation will be implemented in 2026, filling the domestic gap and promoting the standardization of testing specifications for ultra-thin substrates (<0.15mm); The thermal conductivity of the silicon nitride ceramic tube shell developed by Guoci Materials has exceeded 200W/mK and has been widely applied in low orbit satellite communication RF systems. By 2025, the demand growth rate for silicon nitride in China's 5G communication field will reach 22%, the market size will exceed 2.5 billion yuan, and the localization rate will jump from less than 20% to 55%, completely breaking the monopoly pattern of Toshiba and Kyocera in Japan. Top enterprises have achieved a 38% reduction in single chip costs through the optimization of pressure sintering, laser cutting, and CMP polishing processes, supporting communication giants such as Huawei and ZTE to achieve independent and controllable core materials. China is transforming from a 'global purchaser' to a 'technology definer'.