As semiconductor manufacturing advances toward higher precision, higher reliability, and more complex process conditions, the role of ceramic materials in the semiconductor industry chain is attracting increasing attention. From wafer processing and precision motion components to the packaging of high-power electronic devices, ceramic materials have become an important material choice for certain key steps due to their heat resistance, wear resistance, electrical insulation, and thermal management properties. Among them, silicon nitride (Si₃N₄) offers high mechanical strength, fracture toughness, thermal shock resistance, and good electrical insulation, giving it development potential in specific semiconductor applications.
However, it must be made clear that silicon nitride is not currently the mainstream choice for ceramic components in all semiconductor equipment, and its competitiveness depends on the specific process, operating environment, and component requirements. To judge its future development space, it is necessary to analyze three aspects: applications that have already taken shape, technologies under development, and competition with other ceramic materials.
I. High-Thermal-Conductivity Silicon Nitride Ceramic Substrates: An Important Direction in Power Semiconductor Packaging
High-thermal-conductivity silicon nitride ceramic substrates are one of the application directions for silicon nitride in the field of electronic packaging that currently has a clear technical basis.
In power semiconductor modules, insulating substrates must provide electrical insulation while also carrying out heat conduction and mechanical support functions. As power density increases, substrates not only need good thermal conductivity but also sufficient mechanical strength, thermal shock resistance, and long-term reliability.
Silicon nitride ceramics combine relatively high mechanical strength, fracture toughness, and good thermal properties, and therefore have attracted attention in the field of high-reliability power electronic packaging. Extensive work has been carried out on achieving high thermal conductivity in silicon nitride ceramics, including optimizing sintering aids, controlling grain morphology and orientation, and improving forming and sintering processes.
A review published in 2026 in KONA Powder and Particle Journal, titled "High Thermal Conductivity of Silicon Nitride Ceramics: A Review," summarized research progress on the thermal conductivity of silicon nitride ceramics and introduced their application in high-thermal-conductivity ceramic substrates. The article noted that through methods such as grain orientation control, researchers have obtained silicon nitride ceramics with a thermal conductivity of 155 W/(m·K); with subsequently developed strong magnetic field orientation technology, the thermal conductivity reported in studies can be further increased to 176 W/(m·K), and the reaction sintering route has also achieved research results of approximately 180 W/(m·K).
It should be noted that these figures are results obtained under specific research conditions and do not mean that all silicon nitride products can reach the same level.
From the perspective of industrial application, silicon nitride ceramic substrates are one of the important research and application directions in the field of power electronic packaging. However, substrate thermal conductivity is not the only evaluation indicator; copper layer bonding, thermal cycling reliability, manufacturing cost, and batch consistency also affect actual material selection.
For advanced ceramics enterprises, the core competitiveness in this direction is not merely sintering silicon nitride ceramics, but rather stably controlling material performance and meeting the subsequent requirements of substrate processing, metallization, and reliability verification.
II. Precision Ceramic Components in Semiconductor Equipment: Silicon Nitride Has Opportunities, but Generalization Should Be Avoided
Semiconductor manufacturing equipment includes multiple steps such as wafer processing, surface treatment, thin film deposition, etching, cleaning, and inspection. Different processes have very different requirements for materials, and it cannot simply be assumed that one type of ceramic is suitable for all equipment.
In components required to withstand mechanical loads, friction and wear, or thermal shock, the material characteristics of silicon nitride are somewhat attractive. For example, after verification of specific structures and operating conditions, the feasibility of using silicon nitride for precision wear-resistant components, support components, or motion-related components can be evaluated.
However, a distinction must be made between "the material has potential applicability" and "mature applications already exist in the industry."
At present, it cannot be asserted merely on the basis that silicon nitride has high strength and wear resistance that it has already been widely used in wafer carrier trays, electrostatic chucks, etching chamber components, or various ceramic parts in thin film deposition equipment. The material selection for these components is affected by multiple factors such as process environment, cleanliness, particle control, plasma resistance, thermal expansion matching, and equipment structure.
Taking the semiconductor equipment ceramic product catalog publicly released by Japan's Kyocera as an example, the specific products shown include alumina wafer grinding discs, silicon carbide wafer grinding discs, sapphire carrier plates, as well as plasma-related components, wafer transfer components, and heaters. This shows that the semiconductor equipment ceramics market has a clear division of materials, and materials such as alumina, silicon carbide, and sapphire already have specific product applications in different process steps.
Therefore, when developing semiconductor customers, silicon nitride enterprises should not use "semiconductor equipment needs advanced ceramics" as the sole entry point, but should further confirm: What material is currently used for the target component? What are the pain points of the existing material? Can silicon nitride form a verifiable advantage in terms of performance, lifetime, processing precision, or overall cost?
For silicon nitride, finding a material substitution opportunity for a specific component is usually more practically meaningful than broadly promoting its suitability for semiconductor equipment.
III. A Necessary Distinction: Silicon Nitride Ceramics and Silicon Nitride Thin Films Are Not the Same Application Route
When discussing the relationship between silicon nitride and semiconductors, there is another easily confused issue: the silicon nitride thin films that frequently appear in semiconductor manufacturing processes and bulk silicon nitride ceramics belong to different application systems.
Silicon nitride thin films used in semiconductor processes are usually represented in forms such as SiNₓ, and their uses include dielectric layers, insulating layers, passivation layers, and diffusion barrier layers in specific processes. The preparation, composition, stress, and electrical properties of the films need to be controlled according to specific process requirements.
For example, a review published in 2021 in Materials, titled "Silicon Nitride and Hydrogenated Silicon Nitride Thin Films: A Review of Fabrication Methods and Applications," systematically discussed the fabrication methods and applications of silicon nitride and hydrogenated silicon nitride thin films.
However, this does not mean that enterprises producing bulk silicon nitride ceramic powders or structural parts can directly enter the semiconductor thin film materials market. The two differ markedly in raw material systems, preparation processes, quality control, and customer certification.
For enterprises whose main business is silicon nitride powders and sintered ceramic components, it is more worthwhile to prioritize research on specific applications of bulk ceramics in precision equipment, thermal management, and wear-resistant structures, rather than directly treating the maturity of thin film processes as the maturity of the bulk ceramic market.
IV. What Challenges Does Silicon Nitride Face in the Semiconductor Field?
Silicon nitride has many excellent properties, but its industrialization still faces practical constraints.
First, material performance needs to match specific operating conditions. High strength, high toughness, or high thermal conductivity alone cannot determine whether a material is suitable. For example, in semiconductor equipment, particle contamination, metal impurities, surface roughness, and dimensional stability may be as important as mechanical performance.
Second, the preparation and processing of silicon nitride ceramics present certain difficulties. The material has strong covalent bond characteristics, and densification usually requires appropriate sintering technologies and additive systems. Complex structural parts also involve issues such as forming shrinkage, machining allowance, dimensional tolerances, and batch consistency.
Third, silicon nitride must compete with other materials. In different semiconductor processes, materials such as alumina, silicon carbide, aluminum nitride, quartz, and sapphire all have their own application bases. Only when silicon nitride shows comprehensive advantages under specific operating conditions can it possibly obtain stable substitution opportunities.
Fourth, laboratory performance does not equal batch application capability. Thermal conductivity, strength, or other performance indicators achieved in materials research cannot be directly equated with the performance of enterprises' mass-produced products. What customers ultimately focus on is batch stability, actual service life, reliability verification, and overall cost.
These factors determine that the development of silicon nitride in the semiconductor field depends not only on improving the material's own performance but also on continued progress in manufacturing processes, precision machining, and customer verification capabilities.
V. Where Are the Future Development Opportunities?
Based on existing literature and public product information, the opportunities for silicon nitride in semiconductor-related fields can be understood from three levels.
First, high-thermal-conductivity silicon nitride ceramic substrates have a relatively clear technical research basis and application background in power electronic packaging. Future development priorities include improving thermal conductivity, optimizing manufacturing processes, enhancing batch consistency, and verifying long-term reliability.
Second, in the field of semiconductor equipment, application opportunities for precision ceramic components can be sought around specific operating conditions, with key consideration given to requirements such as wear resistance, thermal shock resistance, dimensional stability, and mechanical reliability. However, each component needs to independently complete material adaptation and customer verification, and market demand cannot be inferred solely from material performance.
Finally, with the development of ceramic forming and precision manufacturing technologies, the design and manufacturing capabilities for complex structural parts are also continuing to advance. A review published in 2022 in the Journal of the European Ceramic Society, titled "Review of additive manufacturing and densification techniques for the net- and near net-shaping of geometrically complex silicon nitride components," discussed progress in additive manufacturing and densification technologies for complex silicon nitride structural parts, providing a research reference for related product design and manufacturing routes.
It should be emphasized that research progress in additive manufacturing does not mean that all complex structural parts already have mature and economical mass production conditions; specific applications still depend on process maturity and product requirements.
Conclusion
The combination of silicon nitride and the semiconductor industry includes both high-thermal-conductivity ceramic substrates with a clear research and application basis and precision ceramic components for equipment that require verification against specific operating conditions. At the same time, the application of silicon nitride thin films in semiconductor processes belongs to another technical route and cannot be confused with bulk silicon nitride ceramics.
For advanced ceramics enterprises, what is truly worth focusing on is not "whether silicon nitride can enter the semiconductor industry," but which specific components have clear material needs, what problems silicon nitride can solve, and whether such advantages can be translated into stable commercial value through customer verification.
Moving from material performance to practical application requires process analysis, product design, process control, performance testing, and customer verification. Only by implementing these steps one by one can the technical potential of silicon nitride have the opportunity to be transformed into genuine industrial competitiveness.