Composite Materials Due to their unique combination of properties, molybdenum-copper composite materials are widely used in various fields such as electronic packaging, aerospace, and high thermal conductivity requirements. However, different application scenarios have varying performance requirements for materials, so it is necessary to select the appropriate model based on specific needs, while comprehensively considering factors such as purity, strength, and cost. The following provides a comprehensive analysis of the selection of molybdenum-copper composite materials.
I. Selection of Model for the Field: Recommended Model for the Electronic Packaging Field: MoCu20 (20% copper content).
Reason: This model has a thermal expansion coefficient of 7.7×10⁻⁶/K, which is close to that of semiconductor materials (such as Si, with a CTE ≈ 3×10⁻⁶/K). It can further match thermal expansion through a “sandwich” structure (such as Cu-MoCu-Cu) to reduce thermal stress. At the same time, its thermal conductivity (170-190 W/(m·K)) meets the heat dissipation requirements, and the cost is moderate.
Optimization scheme: Adopt a “sandwich” structure by adding copper layers on both sides of MoCu20 to further reduce thermal stress and enhance packaging reliability.
Recommended models in the aerospace field: MoCu20 or MoCu30 (containing 30% copper).
Reason: The aerospace industry has extremely stringent requirements for materials, necessitating a balance between lightweight (density ≤ 9.9 g/cm³) and high strength. MoCu20 has a lower coefficient of thermal expansion, making it suitable for use as a structural component; whereas MoCu30 exhibits superior thermal conductivity, making it ideal for use as a thermal protection material.
Optimization plan: For MoCu30, the porosity can be controlled by compression molding (15%-30%) to enhance the material’s density, thereby improving its mechanical properties and thermal stability.
Recommended models for high thermal conductivity scenarios: MoCu40 or MoCu50 (containing 40%-50% copper).
Reason: When the copper content is ≥40%, the thermal conductivity of molybdenum-copper composite materials exceeds 200 W/(m·K), making them suitable for applications requiring rapid heat dissipation, such as laser devices and microwave packaging. However, high copper content also results in a high thermal expansion coefficient (≥11.5×10⁻⁶/K), necessitating an assessment of thermal compatibility.
Optimization plan: Adopt the infiltration method to enhance the density (≥99%), reduce thermal resistance, and simultaneously optimize the material structure design to alleviate the stress caused by thermal expansion.
II. The Core Impact of Purity on Performance Purity directly affects the conductivity, thermal conductivity, and corrosion resistance of molybdenum-copper composite materials. High-purity materials (with purity ≥99.9%) can reduce the impact of impurities on electron scattering, significantly enhance thermal conductivity (up to 200 W/(m·K) or more), and reduce resistivity, making them suitable for high-power electronic device packaging (such as IGBT modules, laser diodes) and aerospace thermal management components.
Materials with low purity may introduce impurities such as oxygen and carbon, forming brittle phases (such as MoO₃, Cu₂O) that reduce material strength and plasticity. For example, when the impurity content exceeds 0.1%, the tensile strength of the material may decrease by 10%-15%, and cracks are prone to occur during thermal cycling.
Application scenario selection for high purity (≥99.9%): suitable for fields with extremely high requirements for thermal stability, such as semiconductor packaging, microwave devices, and precision instruments.
Medium purity (99%-99.9%): suitable for cost-sensitive applications such as general electronic heat dissipation and electrical contacts in power electronics.
Low purity (<99%): Only suitable for structural components with lower performance requirements or as temporary substitute materials.
III. Correlation between Strength and Composition: Enhancement of Strength by Molybdenum Content. Molybdenum is a hard phase, and its increased content can significantly enhance the strength of materials. For example:
MoCu20 (80% molybdenum): With a tensile strength of approximately 280 MPa, it is suitable for structural components requiring high load-bearing capacity.
MoCu40 (60% molybdenum): The tensile strength decreases to around 200 MPa, but the plasticity is better, making it suitable for rolling into thin plates or foils.
Fiber-structured molybdenum-copper composite material: Reinforced by molybdenum fibers, its hardness can reach 226.7 HV when the molybdenum mass fraction is 84.77%, which is much higher than that of particle-reinforced materials.
The contribution of copper content to toughness is that copper phase can inhibit crack propagation and enhance material plasticity. For example:
MoCu10 (90% molybdenum): It exhibits low elongation and is prone to brittle fracture, necessitating the use of a “sandwich” structure (such as Cu-MoCu-Cu) to enhance toughness.
MoCu30 (70% molybdenum): The elongation rate is significantly improved, making it suitable for manufacturing parts with complex shapes (such as heat sinks and contacts).
Strengthening mechanism selection: Particle reinforcement is suitable for scenarios that are cost-sensitive and have moderate strength requirements (such as general electronic packaging).
Fiber reinforcement: suitable for high-strength and wear-resistant applications (such as components in aerospace propulsion systems).
Continuous phase reinforcement: By optimizing the interface bonding between molybdenum and copper, a balance between strength and toughness is achieved (such as in microwave device substrates).
IV. Cost composition and optimization strategies: Raw material cost – Molybdenum price: Molybdenum metal prices fluctuate significantly (for example, around 300,000-500,000 yuan/ton in 2026). The higher the molybdenum content, the greater the proportion of material cost. For instance, in the raw material cost of MoCu80, molybdenum accounts for over 80%.
Copper price: Copper prices are relatively stable (e.g., approximately 60,000-80,000 yuan/ton in 2026), but the cost of copper in high copper content models (such as MoCu40) can still account for over 40%.
Optimization suggestion: Select the molybdenum/copper ratio based on the application scenario, and avoid excessively pursuing high purity or high molybdenum content. For example, in the field of electronic packaging, MoCu20 has the best comprehensive performance-to-cost ratio.
Processing cost of powder metallurgy method: The cost is relatively low (about 10,000-20,000 yuan/ton), but the density is relatively low (usually <98%), requiring subsequent heat treatment to improve performance.
Infiltration method: The density can reach over 99%, but the equipment investment is large (the price of a single infiltration furnace exceeds 5 million yuan), suitable for mass production.
Fiber reinforcement process: It requires multiple steps (weaving, molding, pre-sintering, infiltration), with the highest processing cost (approximately 30,000-50,000 yuan/ton), and is only used in high-end fields.
Optimization suggestions: For small-scale production, powder metallurgy is preferred; for large-scale production, infiltration casting is adopted; for high-end customized needs, fiber reinforcement process is selected.
Market supply and demand influence the demand side: The growth in demand from sectors such as aerospace and new energy vehicles has driven up the prices of molybdenum-copper composite materials (for instance, the domestic average price in 2026 was approximately 15,000-20,000 yuan/ton).
Supply side: The rising cost of molybdenum mining and stricter environmental protection policies have led to a tight supply of raw materials, further driving up prices.
Optimization suggestion: Sign long-term contracts with suppliers to lock in prices, or adopt alternative materials (such as tungsten-copper composite materials) to reduce costs.
V. Comprehensive selection suggestion: Recommended model for the electronic packaging field: MoCu20 (80% molybdenum).
Reason: The thermal expansion coefficient matches that of semiconductor materials, the thermal conductivity meets the heat dissipation requirements, and the cost is moderate.
Optimization plan: Adopt a “sandwich” structure to further reduce thermal stress.
Recommended models in the aerospace field: MoCu30 (70% molybdenum) or fiber-structured MoCu composite materials.
Reason: It balances lightweight and high strength, making it suitable for high-temperature and high-stress environments.
Optimization plan: Control the porosity through molding to enhance the density of the material.
Recommended model for high thermal conductivity requirements: MoCu40 (60% molybdenum).
Reason: With a thermal conductivity exceeding 200 W/(m·K), it is suitable for extreme heat dissipation scenarios.
Optimization plan: Adopt infiltration method to enhance density and reduce thermal resistance.
