导热系数仪

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iTherM2025|导热系数怎么测?原理、方法全解析
DT新材料· 2025-08-16 16:04
Core Viewpoint - The article discusses the importance of thermal conductivity measurement, its principles, methods, and applications in various industries, emphasizing its critical role in material selection and thermal management solutions [3][4]. Group 1: Definition and Importance of Thermal Conductivity - Thermal conductivity (λ or k) is a key physical parameter that measures a material's ability to transfer heat, defined by Fourier's law [3][4]. - Accurate measurement of thermal conductivity is essential for evaluating materials in modern electronics, energy systems, and building insulation, ensuring performance stability and safety [4]. Group 2: Common Measurement Methods - Thermal conductivity measurement methods are categorized into steady-state and transient methods, suitable for different material types and temperature ranges [5][6]. - Steady-state methods include: - Guarded hot plate method: High precision, suitable for insulation materials, but time-consuming [7][8]. - Heat flow meter method: Simple and cost-effective, but requires good contact interface [9][10]. - Pipe method: Suitable for cylindrical materials, but complex equipment is needed [11][12]. - Transient methods include: - Laser flash method: Fast measurement, suitable for solid materials, but requires surface treatment [13][15]. - Hot wire method: Quick and flexible for various samples, but sensitive to environmental noise [16][18]. - Thermal probe method: Non-destructive and quick, but requires careful contact management [19][20]. - Transient plane source method: Fast and versatile, but accuracy depends on contact conditions [21][22]. Group 3: Recommended Instrument Suppliers - Notable suppliers of thermal conductivity measurement instruments include: - Netzsch: Specializes in laser flash and transient plane source methods, serving metals and ceramics [24]. - Hot Disk: Focuses on heat flow meter and laser flash methods, applicable in electronics and construction [25]. - Linseis: Offers heat flow meter and transient plane source methods for polymers and ceramics [26]. - TA Instruments: Known for heat flow meter and laser flash methods, focusing on polymers and composites [28]. - Xi'an Xiaxi Electronics: Develops thermal property instruments for various industries [30]. - Xiangtan Instrument: Provides guarded hot plate and heat flow meter systems for insulation and soil research [32]. Group 4: Upcoming Industry Event - The Sixth Thermal Management Industry Conference and Exposition will take place from December 3-5, 2025, at the Shenzhen International Convention and Exhibition Center, featuring leading suppliers and the latest thermal management solutions [32][38].