Introduction: A Material Revolution Under Heat Dissipation Bottlenecks

High-end technological fields such as AI computing clusters, 5G communication base stations, and high-power lasers are facing increasingly severe heat dissipation challenges. The power consumption of a single AI GPU exceeds 1400W, the heat flux density of 5G radio frequency power amplifier modules surpasses 300W/cm², and the local hotspot temperature of high-power laser diodes can reach over 200°C. Traditional heat dissipation materials including copper, aluminum, and aluminum nitride have approached their physical limits. Insufficient thermal conductivity (copper: approx. 400 W/m·K) and mismatched coefficient of thermal expansion (silicon: 3 ppm/K vs copper: 16.5 ppm/K) frequently trigger chip reliability issues.

Against this backdrop, diamond — the material with the highest known thermal conductivity in nature — is advancing from laboratory research to the forefront of industrialization. Recently, a Hunan-based enterprise announced that its diamond heat sink substrates have been adopted by customers in civil radio frequency, radar, laser and other fields, entering the stage of small-batch shipment. Measured data shows that adopting diamond heat sinks reduces the thermal resistance of laser chips by 81.1% compared with ceramic substrates. This milestone marks that high-end heat dissipation materials have officially stepped into a new stage of commercial application.

Chapter 1 Core Advantages of Diamond Heat Dissipation Technology

1.1 Unmatched Physical Properties

Diamond is hailed as the ultimate heat dissipation material due to its unique crystal structure. Carbon atoms form a highly ordered tetrahedral lattice through sp³ hybridization with extremely few defects. Heat is mainly transferred via phonons (lattice vibration quanta), featuring a long average phonon free path and low scattering rate.

Key Performance Parameter Comparison

1.2 Synergistic Multiple Advantages

• Electrical Insulation & High Withstand Voltage: Resistivity reaches 10¹⁴–10¹⁶ Ω·cm, with breakdown electric field exceeding 10 MV/cm, meeting the electrical isolation requirements of high-power devices.
• Mechanical Strength & Chemical Stability: Mohs hardness up to grade 10, resistant to high temperature (>600°C) and corrosion, suitable for extreme operating environments.
• Lightweight Design: Density is only 3.52 g/cm³, 40% of copper, significantly reducing the weight of heat dissipation systems.

1.3 Analysis of Thermal Resistance Reduction Mechanism

Measured data from a Hunan enterprise shows diamond heat sinks cut laser chip thermal resistance by 81.1%. This breakthrough stems from multi-level technological innovation:

• Interfacial Thermal Resistance Optimization: Adopting high-thermal-conductivity solder (Au-Sn eutectic) and Ti/Cu/Au multi-layer metallization transition layer, reducing the unit area thermal resistance from 10–20 K·mm²/W of traditional solutions to 2–5 K·mm²/W.
• Lateral Heat Spreading Enhancement: The high in-plane thermal conductivity of diamond rapidly diffuses heat from chip hotspots to surrounding areas, lowering temperature inhomogeneity from 30–50°C in traditional schemes to 5–10°C.
• Thickness Optimization: In engineering practice, the thickness of diamond heat sinks is optimized within 200–400 μm to balance heat conduction efficiency and mechanical strength.

Chapter 2 Industrialization Breakthrough Progress

2.1 Technological Leap of a Hunan Enterprise

As a pioneer in China’s wide-bandgap semiconductor material sector, a Hunan enterprise has engaged in diamond material R&D for many years and achieved key progress recently:

• Small-batch Shipment Verification: Products have entered the supply chain of civil radio frequency, radar and high-power laser customers, completing the leap from sample verification to bulk orders.
• Measured Performance: Laser chip thermal resistance reduced by 81.1%, junction temperature lowered by 40–60°C, allowing operation at higher power levels.
• Reliability Verification: Passed 1,000-hour continuous operation aging test, meeting the 7×24-hour operation demands of data centers and communication base stations.
• Improved Product Matrix: Covering polycrystalline diamond substrates, electronic-grade single-crystal diamond substrates, heat-sink-grade single-crystal diamond substrates, diamond heat sink substrates and other categories.

2.2 Production Line Commissioning of a Henan Enterprise

Almost simultaneously, a Henan enterprise announced the official commissioning of China’s first 8-inch diamond heat sink wafer production line, achieving a critical leap in the large-scale production of large-size diamond heat dissipation materials:

• Project Overview: Total investment of RMB 1.2 billion, with Phase I investment of RMB 360 million and annual output of 20,000 diamond heat sink wafers.
• Technical Indicators: Thermal conductivity 1800–2200 W/(m·K), yield over 85%, covering 6-inch/8-inch polycrystalline diamond flexible films and 0.1–1 mm thick heat sink wafers.
• Industrial Chain Significance: Breaks foreign technological monopoly, provides independently controllable heat dissipation solutions for China’s high-end semiconductor industry, and drives the high-end transformation of the superhard material industry.

2.3 Industrial Collaborative Ecosystem

The industrialization of diamond heat dissipation materials is the result of collaborative innovation across the industrial chain:

• Material-Equipment Collaboration: Optimized MPCVD equipment lifts deposition rate above 30 μm/h, substantially cutting production costs.
• Industry-University-Research Cooperation: Established in-depth partnerships with Hunan University, CETC 48th Research Institute and other institutions to build full-chain innovation capabilities, with 4 authorized patents.
• Standardization Progress: Accelerated formulation of technical standards covering thermal conductivity testing, interfacial thermal resistance evaluation, reliability verification and other key indicators.

Chapter 3 Application Scenarios and Market Prospects

3.1 Core Application Fields

• AI Computing Clusters: As AI chip power consumption keeps rising (expected to exceed 2000W per chip by 2027), diamond heat sinks reduce GPU junction temperature by 20–30°C, avoiding overheating frequency throttling and improving computing power efficiency. AI servers are expected to become the largest application market by 2030.
• 5G/6G Communication Infrastructure: The heat flux density of millimeter-wave base station power amplifier modules exceeds 300W/cm². Diamond heat sinks ensure stable device operation under high temperature and improve signal transmission quality. They effectively solve thermal accumulation in multi-chip coordinated operation of Massive MIMO antenna arrays.
• High-power Laser Processing: Industrial lasers are evolving toward higher power (>20kW). Diamond heat sinks keep laser diode junction temperature within a safe range, enhancing output power stability and device service life.
• Third-generation Semiconductor Power Modules: SiC and GaN power devices are rapidly popularizing in new energy vehicles, rail transit and other fields. Diamond features higher thermal expansion matching with third-generation semiconductor materials, reducing interfacial thermal stress and improving module reliability.
• Aerospace Electronic Systems: T/R modules of satellite phased array radars face heat dissipation difficulties in vacuum environments. Diamond’s high thermal conductivity and radiation resistance make it an ideal choice, while its lightweight property helps lower launch costs.

3.2 Market Scale Forecast

The diamond heat dissipation material market is on the eve of explosive growth:

• Global Market Scale: According to Global Market Insights, the global market size reached approximately USD 1.2 billion in 2025 and is projected to grow to USD 15.2 billion by 2030, with a CAGR exceeding 200%.
• China Market Prospects: China accounts for over 95% of global synthetic diamond production capacity with inherent advantages. The market scale is expected to reach RMB 120–150 billion by 2028.
• Penetration Rate Growth: Current penetration rate in high-power scenarios is less than 5%, projected to rise to 15–20% by 2030. Penetration is expected to accelerate with falling costs and technological maturity.

3.3 Competitive Landscape

• International Leading Enterprises: Akash Systems (US) took the lead in commercial breakthroughs, delivering the world’s first NVIDIA H200 GPU servers equipped with diamond cooling technology and securing a USD 300 million order. Element Six (Belgium) boasts profound technological accumulation in CVD diamond materials.
• Domestic Leading Enterprises: A Henan firm realized mass production of 8-inch diamond heat sink wafers; a Hunan firm completed small-batch shipments; Liliang Diamond, Sinomach Precision and other enterprises are actively deploying the sector. Domestic manufacturers are extending from material preparation to high-value links such as packaging integration and overall solutions.

3.4 Technological Verification and Reliability

Commercial applications demand stringent reliability verification, and diamond heat sinks have passed multiple rigorous tests:

• Temperature Cycling Test: 1,000 cycles between -55°C and 150°C with no cracking or delamination at the diamond-metal interface, and interfacial shear strength retained above 90% of the initial value, proving excellent thermal fatigue resistance.
• High Temperature & High Humidity Test: 1,000-hour test under 85°C/85%RH with no corrosion or oxidation on diamond surface and stable electrical insulation, meeting requirements of harsh environments such as data centers and outdoor base stations.
• Power Cycling Test: 100,000 power cycles (no load to full load) simulating actual working conditions, with heat dissipation performance attenuation below 5%, far better than traditional materials (usually 20–30% attenuation).
• Mechanical Shock Test: 1500G, 0.5ms shock test per MIL-STD-883 standard, with intact structure and no cracks in diamond heat sinks, proving adaptability to high-vibration environments.

• These test data provide empirical support for the reliability of diamond heat sinks in high-end scenarios and accelerate industrialization.

Chapter 4 Technical Challenges and Breakthrough Paths

4.1 Cost Control Challenges

The current cost of a 4-inch CVD diamond wafer is about USD 5,000, over 10 times that of silicon carbide substrates. Cost composition includes MPCVD equipment depreciation (≈40%), power consumption (≈25%), raw materials (≈15%), labor and processing (≈20%).

Cost Reduction Technical Paths

• Large-area deposition: Develop 12-inch polycrystalline diamond preparation technology to dilute unit area cost
• Higher deposition rate: Optimize plasma parameters to lift growth rate from 10–15 μm/h to over 30 μm/h
• Energy efficiency optimization: Adopt microwave plasma-enhanced CVD technology; using green hydrogen as carbon source can cut production costs by 30–40%
• Domestic equipment substitution: Promote localization of MPCVD equipment to reduce procurement and maintenance costs
• Industry forecasts show that with technological progress and large-scale production, diamond heat sink costs are expected to drop to 40% of the current level by 2028 and achieve price parity with aluminum nitride ceramics by 2030.

4.2 Processing and Integration Difficulties

Diamond’s extreme hardness (Mohs grade 10) brings unique challenges:

• Cutting Technology: Laser stealth cutting has become mainstream; femtosecond lasers form modified layers inside diamonds to achieve high-precision cutting (±5 μm), with processing efficiency 3 times higher than traditional methods.
• Polishing Process: Combined laser modification and mechanical grinding achieve surface roughness of 0.05 μm and parallelism of 10–15 μm, meeting semiconductor packaging requirements.
• Metallization Solution: Vacuum evaporation deposits Ti/Pt/Au multi-layer metal films, forming firm interfaces after high-temperature annealing. Active metal brazing (Ti-Ag-Cu alloy) achieves bonding strength over 50 MPa.
• Interfacial Thermal Resistance Control: Magnetron sputtering deposits nano transition layers (titanium, chromium) combined with Hot Isostatic Pressing (HIP) to realize atomic-level bonding, reducing interfacial thermal resistance by over 70%.

4.3 Material Innovation Directions

• Diamond-Copper Composite: Diamond particles uniformly dispersed in copper matrix with measured thermal conductivity of 600–1000 W/(m·K), cutting cost by over 50% compared with pure diamond. Laser-assisted ball milling realizes uniform nano-scale particle distribution.
• Diamond-Aluminum Composite: Tailored for lightweight demand with density of only 2.7–3.0 g/cm³ and thermal conductivity of 400–600 W/(m·K), suitable for weight-sensitive scenarios such as aerospace and portable devices.
• Functionally Graded Materials: Regulate gradient distribution of diamond volume fraction along the thickness direction to optimize thermal stress distribution, significantly improving interfacial reliability and device lifespan.
• Doping Modification Technology: Doping with boron, nitrogen and other elements regulates electronic structure and thermal properties. Boron-doped diamond maintains high thermal conductivity while enhancing electrical performance, realizing integrated heat conduction + semiconductor functions.

Chapter 5 Future Outlook and Industrial Suggestions

5.1 Technology Roadmap

Short-term (2026–2028): Large-scale Breakthrough Period

• Realize stable mass production of 8-inch wafers with yield raised above 90%
• Establish standardized testing methods and reliability evaluation systems
• Achieve batch application in high-end AI servers, 5G base stations and other fields
• Reduce costs to 40–50% of the current level

Medium-term (2029–2031): Cost Competitiveness Period

• Launch small-batch production of 12-inch wafers
• Develop multi-functional integrated heat dissipation solutions
• Lift market penetration to 10–15%
• Achieve price parity with high-end ceramic materials

Long-term (After 2032): Full-scenario Application Expansion Period

• Build a complete diamond heat dissipation ecosystem
• Achieve extensive application in consumer electronics, automotive electronics and other fields
• Develop new heat dissipation structures and thermal management algorithms
• Further reduce costs and become a mainstream heat dissipation solution

5.2 Industrial Ecosystem Construction Suggestions

• Policy Support System: Incorporate diamond heat dissipation materials into national new material industry development plans, offering R&D subsidies and tax incentives. Build national-level testing and certification platforms to promote standard formulation and international mutual recognition.
• Industry-University-Research Collaborative Innovation: Encourage universities and research institutes to jointly build laboratories with enterprises for basic research and applied technology breakthroughs. Set up special funds to support key technology R&D and talent training.
• Vertical Industrial Chain Integration: Promote material enterprises to extend downstream and develop customized heat dissipation solutions. Encourage cooperation between equipment and material manufacturers to optimize processes and equipment design. Establish industrial alliances for information sharing and resource collaboration.
• Market Application Guidance: Drive application verification through demonstration projects such as national computing hubs and 5G network construction. Encourage end manufacturers to participate in technology development and standard formulation to form a demand-driven innovation model.

5.3 Sustainable Development Considerations

• Energy Efficiency Contribution: Diamond heat dissipation improves energy efficiency of electronic equipment and reduces power consumption. In data center applications, it can lower PUE from 1.4 to 1.03 with remarkable energy-saving effects.
• Material Recycling: Develop recycling and regeneration technologies for diamond composite materials to improve resource utilization. Research non-destructive stripping and secondary bonding processes to extend material service life.
• Green Production: Optimize CVD processes to reduce energy consumption and greenhouse gas emissions. Develop environmentally friendly processing additives and cleaning processes to cut chemical pollution.
• Life Cycle Assessment: Establish a full life cycle evaluation system covering raw material acquisition, production, operation & maintenance, and scrap recycling, to comprehensively assess environmental impact and guide industrial green development.

Conclusion: The Dawn of a New Heat Dissipation Era

The realization of small-batch shipment of diamond heat sinks is not only a technological breakthrough for individual enterprises, but also a landmark symbol of the maturity of the entire high-end heat dissipation material industry. From theoretical verification in laboratories to large-scale production on production lines, and further to batch adoption by customers, diamond heat dissipation materials have completed the critical leap from technical possibility to engineering feasibility.

Behind the 81.1% thermal resistance reduction lies collaborative innovation across materials science, process engineering, packaging technology and other fields. This figure represents not only performance leap, but also a profound transformation in the design paradigm of high-power electronic devices — when heat dissipation is no longer a performance bottleneck, chip designers can focus more on improving computing density and energy efficiency, and system engineers can achieve more compact integration and higher reliability.

Looking ahead, with continuous cost reduction, maturing processes and expanding application scenarios, diamond heat dissipation materials will gradually penetrate from the current high-end niche market to broader fields. From AI computing centers to 5G communication networks, from new energy vehicles to aerospace, diamond is redefining the boundary of thermal management possibilities.

This material innovation-driven heat dissipation revolution will not only enhance the performance and reliability of electronic equipment, but also make important contributions to energy conservation, emission reduction and green computing. When heat no longer restricts technological progress, humanity will unlock unprecedented technological possibilities — and all of this starts right now with the small-batch shipment of diamond heat sinks.