The sustainability of silicon nitride (Si₃N₄) powder is primarily reflected in the green transformation of raw material sourcing. While traditional silicon nitridation processes are energy-intensive and time-consuming, the industry is accelerating the high-value utilization of silicon waste. Significant volumes of silicon powder by-products—generated during high-efficiency monocrystalline silicon production and wafer slicing—were previously limited to low-value applications. Today, through key technologies such as advanced purification and low-temperature nitridation synthesis, these can be transformed into high-purity silicon nitride powder. This shift converts silicon waste into high-value products, fostering a circular economy and enhancing resource efficiency across the photovoltaic (PV) supply chain.

Sustainability at the structural component level focuses on two main areas: ultra-long service life and lightweight substitution. Silicon nitride components can offer a service life 2–3 times longer than metal counterparts, with certain parts like grinding discs and agitator shafts exceeding metal longevity by over tenfold. This significantly reduces replacement frequency, resource consumption, and waste generation. Furthermore, the lightweight design of silicon nitride ceramic parts directly lowers energy consumption during transportation and operation, providing a natural advantage in meeting "Dual Carbon" goals.

Silicon nitride (Si₃N₄) ceramic bearings are the most representative products for improving energy efficiency in end-use applications. Compared to traditional steel bearings, silicon nitride bearings exhibit an extremely low coefficient of friction. When replacing standard bearings in electric motors, they reduce bearing power loss by an average of 48%; under specific load conditions, the energy-saving potential can reach up to 57%.

In practical industrial applications, Si₃N₄ bearings can operate under non-lubricated or minimal-lubrication conditions, with a friction coefficient far lower than traditional materials like steel, resulting in less heat generation and lower energy consumption under the same load. Capable of stable operation at high temperatures up to 1,200°C, their heat resistance is 5–8 times higher than ordinary bearings. This extends continuous equipment uptime by 3 times and pushes maintenance intervals from once a week to once every six months.

Silicon nitride ceramic bearing balls play a critical role in NEV electric drive systems. Implementing Si₃N₄ balls achieves a 60% weight reduction, lowers the friction coefficient to below 0.001, and reduces energy consumption by 30%, supporting the optimization of vehicle energy consumption to 12.7 kWh/100km. By 2025, the demand for high-purity silicon nitride powder for high-end NEV bearings is expected to exceed 800 tons, with a compound annual growth rate (CAGR) of over 28%. Additionally, silicon nitride ceramic substrates account for 42% of global demand in the NEV motor controller sector; thanks to their superior thermal conductivity and insulation properties, they have been officially adopted for mass production in electric vehicles.

Silicon nitride ceramic substrates account for 28% of global demand in PV inverters and are also utilized in wind power converters, High-Voltage Direct Current (HVDC) transmission systems, and solid-state transformers for smart grids. As governments worldwide aim to triple renewable energy capacity by 2030, the application of silicon nitride in energy-efficient power systems is expected to expand further.

The thermal conductivity of silicon nitride ceramic substrates can reach 90–120 W/(m·K). Their coefficient of thermal expansion (CTE), which closely matches that of third-generation semiconductor substrates (such as Silicon Carbide), ensures interface stability during operation. Furthermore, integrated lightweight Si₃N₄ impellers increase heat dissipation area by 30% and reduce weight by 25% compared to traditional structures, marking an upgrade in cooling components from "passive heat dissipation" to "active thermal optimization."