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Analysis of the Application of CBN Boron Nitride in Thermal Management for Electronic Devices
Release date:
2021-07-30
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In thermal management for electronic devices, materials capable of efficient heat dissipation are essential. Since carbon-based materials—such as graphene, carbon nanotubes, diamond, and graphite—have not delivered particularly impressive performance in such applications, continuous research has led to the emergence of cubic boron nitride (cBN). Studies have shown that pure cubic boron nitride (cBN) exhibits a thermal conductivity of 1600 W/m·K at room temperature, approximately 75% of that of diamond, making it highly suitable for use.
Its exceptionally high thermal conductivity and wide bandgap of 6.2 eV endow cubic boron nitride with promising applications in thermal management for microelectronic materials, as well as in high‑power electronics and optoelectronic devices. Experimental studies have demonstrated that, by employing various synthesis methods, boron arsenide crystals with thermal conductivities comparable to those of diamond can be prepared, reaching values of 900–1300 W/m·K; theoretical predictions even suggest thermal conductivities as high as 2200 W/m·K, all at a cost lower than that of diamond.
Due to the intrinsic mass differences between arsenic and boron, a substantial frequency gap exists between acoustic and optical phonons. This property enhances the efficiency of heat conduction across crystals. In the semiconductor field, boron arsenide crystals share a similar 1.5 eV bandgap with silicon semiconductors and exhibit comparable thermal expansion coefficients. When integrated into semiconductor devices, the reduction in thermal stress allows for a decrease in the amount of thermal interface material required [5].
In summary, cubic boron nitride (CBN) ranks second only to diamond in hardness, yet its thermal stability far exceeds that of diamond, and it exhibits remarkable chemical inertness toward iron‑group metals and their alloys. Consequently, CBN machining offers unique advantages when processing ferrous metals and their alloys. It provides a new approach for machining these hard, tough, and difficult-to‑cut materials. Given that diamond is well suited to hard, brittle materials, CBN serves as an ideal complement, making the trend toward replacing conventional abrasives with CBN increasingly evident. Extensive empirical evidence demonstrates that CBN‑based grinding tools deliver unparalleled performance.
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