Surge in AI Computing Power Consumption: How Ceramic Substrates Become the "Ultimate Armor" for AI Chip Heat Dissipation

The global AI computing power race has fully entered a cycle of high-power-density iteration. Thermal management has evolved from an auxiliary design aspect of traditional packaging into a core bottleneck constraining the release of high-end AI chip computing power, operational reliability, and the overall lifecycle of equipment. With the rollout of next-generation high-computing-power chips like NVIDIA's H100 and B200, single-chip power consumption has surged from 700W to over 1000W, with next-generation flagship AI chips already targeting 1500W and beyond. Concurrently, the power density of supporting AI server racks has soared from traditional levels of tens of kilowatts to over 600 kilowatts. This exponential increase in computing power consumption has led to a leap in packaging heat flux density, completely breaching the physical performance limits of traditional substrate materials like FR-4 organic substrates and ordinary glass substrates. Substrate iteration under high-power scenarios has become an inevitable industry trend.

The core challenge in thermal management for current kilowatt-level AI chips lies in the insufficient conduction capacity for ultra-high heat flux density and suboptimal thermal stress matching in packaging. Traditional substrates are prone to issues such as chip hot spot aggregation, junction temperature exceeding limits, active frequency reduction, and delamination failure, which drastically compress effective computing power output and equipment service life. Against this backdrop, ceramic substrates, long used in power semiconductors and high-reliability aerospace and military applications, are rapidly expanding into new scenarios due to their excellent thermal conductivity, thermal expansion coefficient matching silicon, and high structural rigidity. They have upgraded from a niche specialty material to a core, indispensable substrate for ultra-high-power AI packaging.

I. Core Material Mechanisms: Three Inherent Properties of Ceramic Substrates Address AI Packaging Thermal Management Challenges

The industrial value of ceramic substrates fundamentally stems from how their physical and chemical properties precisely match the three core engineering needs of ultra-high-power AI packaging: heat conduction, thermal stress buffering, and structural stability. Domestic precision PCB enterprise Kinji has completed a full range of ceramic substrate material layouts, including Aluminum Nitride (AlN), Silicon Nitride (Si₃N₄), and Alumina (Al₂O₃). They have also established mass production capabilities for HTCC, LTCC, and AMB processes, enabling the mass production and customized development of high-precision 1-6 layer ceramic PCBs, fully unleashing the application value of ceramic substrate technology.

Order-of-Magnitude Thermal Conductivity Advantage, Significantly Reducing Packaging Thermal Interface Resistance

The primary cause of thermal failure in high-end AI chips is not overall excessive temperature rise, but rather hot spot aggregation caused by localized ultra-high heat flux density. Traditional FR-4 organic substrates have a thermal conductivity of only 0.3 W/m·K, offering extremely poor in-plane heat spreading and vertical conduction capabilities, leading to high interface thermal resistance. Faced with the ultra-high heat flux density of AI chips (hundreds of watts per square centimeter), they cannot quickly dissipate accumulated heat, causing junction temperatures to rapidly exceed limits and triggering TDP power restrictions and performance throttling.

Ceramic substrates deliver a generational leap in thermal conductivity. Aluminum Nitride (AlN) ceramics offer a thermal conductivity of 170–230 W/m·K, hundreds of times that of FR-4. Their pore-free, dense ceramic structure creates a low-loss vertical heat conduction path, making them the preferred substrate for 1000W+ ultra-high-power AI chips. Commercially available Silicon Nitride (Si₃N₄) ceramics maintain a stable thermal conductivity of 20–90 W/m·K, with high-purity lab samples exceeding 100 W/m·K, suitable for medium-to-high-power computing scenarios.

Kinji's self-developed AlN ceramic substrate solution achieves a peak thermal conductivity of 230 W/m·K. Through thick copper layer integration and stepped structural design optimization, it further enhances the vertical heat conduction path, effectively reducing overall packaging thermal resistance and interface contact resistance. This solution can stably support the continuous full-load operation of 1500W-class ultra-high-power chips, fundamentally eliminating issues of heat accumulation and performance degradation under high loads from a material perspective.

Silicon-Matched CTE, Suppressing Thermal Cycle Fatigue Failure

AI servers operate under severe conditions involving frequent high-frequency power switching and large temperature fluctuations. The Coefficient of Thermal Expansion (CTE) mismatch within the packaging system is a primary structural cause of solder joint fatigue, substrate warpage, delamination, and packaging failure. Differences in thermal deformation between the substrate and the silicon chip generate cumulative thermal stress during repeated thermal cycles, ultimately leading to micro-crack propagation, solder joint fracture, and other reliability failures.

The CTE of a silicon chip is approximately 3 ppm/°C, while ceramic substrates maintain a stable CTE of 3–9 ppm/K. This close match ensures highly coupled thermal deformation, significantly buffering interfacial thermal stress during temperature changes and preventing thermal cycle fatigue failure. In contrast, traditional organic substrates have a wide and unstable CTE range, resulting in severe thermal deformation mismatch with silicon chips, making them unsuitable for the long-term, high-frequency, high-reliability operational requirements of AI equipment.

High Modulus Structural Properties, Enhancing Dimensional Stability Under Extreme Conditions

Ceramic materials possess an inherent advantage of high rigidity, deformation resistance, high-temperature tolerance, and vibration resistance, with a Young's modulus of 50–90 GPa. Under the extreme conditions of high load, high humidity, and long-term service in AI servers, ceramics maintain precise dimensional stability, preventing packaging alignment errors and interlayer failures caused by structural deformation.

Kinji's AMB (Active Metal Brazing) thick copper process achieves atomic-level metallurgical bonding between the ceramic substrate and the copper conductive layer, completely eliminating voids and delamination. The finished products can withstand extreme thermal shock cycles from -40°C to 150°C, significantly enhancing packaging power cycling reliability and overall equipment service life, meeting the high-reliability standards required for computing equipment.

II. Core Application Scenarios: Penetrating High-End Computing and High-Speed Optical Modules

As AI chip power density continues to increase and optical modules evolve towards ultra-high speeds, traditional substrates can no longer balance heat dissipation, high-frequency transmission, and reliability requirements. Ceramic substrates have transitioned from performance optimization options to scenario necessities, achieving large-scale penetration in two core areas: high-end large-compute-power chip packaging and ultra-high-speed optical modules, with continued growth in market demand.

Advanced Packaging for High-End GPU/ASIC Large-Compute-Power Chips

Unleashing the full performance of kilowatt-class large-compute-power chips relies on a low-resistance vertical thermal conduction architecture. Embedding ceramic substrates within optimized HDI (High-Density Interconnect) composite packaging structures creates efficient vertical heat dissipation channels, solving the problem of hot spot aggregation caused by ultra-high heat flux density and preventing performance throttling. Kinji's AI-specific ceramic substrate solution is compatible with high-end, precision HDI composite packaging processes, balancing high-precision micro-via routing with ultra-low thermal resistance heat dissipation for lossless, stable computing power output.

Furthermore, while advanced packaging architectures like CoWoS (Chip-on-Wafer-on-Substrate) offer increased interconnect density by "removing" the substrate, they suffer from structural weaknesses like concentrated chip stress, which can lead to solder joint cracking and silicon die micro-damage, affecting yield. Ceramic substrates can serve as an effective stress-buffering layer, effectively dispersing concentrated stress generated during packaging molding and operational conditions. This compensates for the reliability shortcomings of advanced packaging, significantly improving chip packaging yield and long-term operational stability.

800G/1.6T Ultra-High-Speed Optical Modules

During the iteration towards 800G and 1.6T ultra-high-speed optical modules, the power density of optoelectronic chips and signal transmission bandwidth double simultaneously. High-frequency signal dielectric loss and localized chip heat buildup become core bottlenecks restricting product performance and reliability. Aluminum Nitride ceramic substrates, with their combination of ultra-high thermal conductivity, low dielectric loss, and high insulation voltage resistance, simultaneously solve the challenges of high-speed signal transmission and high-density heat dissipation, perfectly matching the trends of miniaturization, high bandwidth, and high power in optical modules.

From an industrial value perspective, the added value of ceramic substrates in this scenario continues to rise. A single 800G optical module uses approximately 12 ceramic substrates; upgrading to the 1.6T specification increases the ceramic substrate value per module from $17 to $22. Even though silicon photonics solutions may optimize the number of substrates used, the value per unit product continues to rise. Through low-dielectric process optimization and ultra-high-precision machining, Kinji ensures low-loss high-frequency signal transmission while achieving efficient heat spreading and dissipation for optoelectronic chips, precisely meeting the demands of high-speed optical module iteration.

III. Industry Bottlenecks: Cost, Brittleness, and Yield Constraints on Mass Adoption

While ceramic substrates represent the optimal engineering solution for current ultra-high-power AI scenarios, three major bottlenecks—high cost, inherent brittleness, and limited yield—restrict their full-scale penetration and currently confine them primarily to high-end, high-reliability computing applications.

First, significant cost barriers for high-end substrates. The unit price of Aluminum Nitride ceramic substrates is 5–10 times that of traditional organic substrates and also higher than glass substrates. While the current tight supply of high-end AI chips means the industry is willing to pay a premium for ultimate cooling performance, the high cost remains a core constraint for penetrating mid-to-low-end computing scenarios and achieving mass adoption.

Second, inherent material brittleness limits large-size applications. Ceramic materials are naturally brittle and have low impact resistance. Large-size substrates are prone to cracking and chipping defects during processing, and yield management difficulty increases exponentially with substrate size, making them challenging for large-panel, mass-production scenarios.

Third, low yield for ultra-precision micro-via machining. Ceramic substrates are extremely hard. Traditional mechanical drilling suffers from severe tool wear, while laser drilling can produce edge micro-cracks and hole wall defects. The industry's mainstream "mechanical micro-drilling + laser-induced + chemical etching" composite process has a narrow parameter window and is difficult to control. Currently, the comprehensive mass production yield for AlN ceramic substrates is only 70%–80%, significantly lower than the 95%+ yield of mature organic substrates.

To address these common industry process pain points, Kinji has completed a full-process manufacturing upgrade. This includes introducing high-precision micro-drilling equipment and laser energy closed-loop control systems, combined with a full-process DFM (Design for Manufacturability) system. This precisely mitigates micro-via processing defects and inhibits micro-crack generation, continuously narrowing the yield gap between ceramic and traditional substrates. They also support the customized processing of multiple specifications and high precision, fully adapting to the differentiated computing power needs of the AI industry.

IV. Technology Route Analysis: Glass and Ceramic Substrates are Complementary, Not Competitive

The long-standing industry debate between glass and ceramic substrate routes fundamentally stems from their different technical positioning and application scenarios. They are not in a competitive substitution relationship but rather complement each other and evolve synergistically, collectively replacing traditional organic substrates to meet the core needs of different segments within AI packaging.

Glass substrates focus on the high-density, high-frequency interconnect segment. Their core advantages are low signal dielectric loss, ultra-fine precision routing, and large-size monolithic molding. Their CTE closely matches silicon chips, making them suitable for scenarios prioritizing signal integrity and high interconnect density, such as CPO (Co-packaged optics) optical interconnects and high-frequency signal transmission.

Ceramic substrates focus on the high-power heat dissipation and high-reliability packaging segment. Leveraging their comprehensive advantages of ultra-high thermal conductivity, low thermal stress deformation, and high structural rigidity, they are uniquely suited for core scenarios demanding high power density and reliability, such as high-end GPUs, high-power ASIC chips, and high-speed optical modules. They are the irreplaceable substrate for ultra-high-power computing devices.

Test data from Kyocera's multilayer ceramic substrates, released in April 2026, further validates that in ultra-high-power computing scenarios, ceramic substrates outperform glass substrates comprehensively in heat dissipation efficiency, thermal cycle reliability, and structural stability, solidifying their monopolistic advantage in the high-power segment. Meanwhile, Kinji, leveraging its core strengths of localized rapid delivery, cost-effective customization, and full-process independent control, is effectively filling the gap in domestic high-end ceramic substrate production capacity and accelerating the industry's import substitution process.

Looking at the long-term industry evolution, the performance bottleneck for future AI chips will gradually shift from thermal management constraints to high-density interconnect constraints, suggesting a broader long-term growth space for glass substrates. However, in the next 3–5 years, the continued rise in chip power density remains the core industry challenge, giving ceramic substrates a decisive lead in market growth and implementation certainty.

V. Industry Summary and Outlook: Ceramic Substrates Define a New Paradigm for High-Power AI Heat Dissipation

As AI chip power consumption surpasses the kilowatt level and heads towards 2000W, traditional organic and glass substrates have hit their physical limits for heat dissipation and reliability, unable to support the continued iteration of high-end computing power. Building on a long history of technological development in military and power semiconductor applications, ceramic substrates are undergoing a value leap in the current wave of AI computing power iteration, becoming the "ultimate armor" for heat dissipation that safeguards the stable operation of ultra-high-power chips.

From a technology iteration perspective, ceramic substrates represent the optimal engineering solution for the current ultra-high-power AI era, but they are not the final form. As computing power density continues to break through and packaging architectures evolve, thermal management materials and processes will continue to iterate. In the future, improvements in yield, cost reduction, and the evolution of multilayer precision processes will determine the upper limits of development for the AI thermal management industry.

Domestic leaders like Kinji are deeply engaged in iterating the entire ceramic substrate process chain, continuously optimizing precision manufacturing and customized solutions. They are helping domestic AI hardware break through high-end thermal management technology bottlenecks and overcome overseas industry monopolies, steadily strengthening the core competitiveness of the domestic supply chain in the critical race between computing power and thermal management, and seizing the initiative in future industry development.