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Enhanced tensile strength and thermal conductivity in copper diamond composites with B4C coating

机译：具有B4C涂层的铜金刚石复合材料的拉伸强度和导热性得到增强

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Boron carbide (B4C) coating on diamond particle is synthesized by heating diamond particles in a powder mix of H3BO3 and B in Ar atmosphere. The composition, bond state and coverage fraction of boron carbide coating on diamond particles are investigated. The boron carbide coating favors to grow on diamond (100) surface rather than on diamond (111) surface. Cu matrix composites reinforced with B4C-coated diamond particles were made by powder metallurgy. The addition of B4C coating gave rise to a dense composite. The influence of B4C coating on both tensile strength and thermal conductivity of the composite were investigated. When the B4C fully covered on diamond particles, the composite exhibited a greatly increase in tensile strength (115 MPa) which was much higher than that for uncoated-diamond/Cu (60 MPa) composites. Meanwhile, a high thermal conductivity of 687 W/mK was achieved in the B4C-coated-diamond/Cu composites.
机译：金刚石颗粒上的碳化硼（B4C）涂层是通过在Ar气氛中将H3BO3和B的粉末混合物中的金刚石颗粒加热而合成的。研究了金刚石颗粒上碳化硼涂层的组成，结合态和覆盖率。碳化硼涂层有利于在金刚石（100）表面上而不是在金刚石（111）表面上生长。用粉末冶金法制备了用B4C涂层金刚石颗粒增强的Cu基复合材料。 B4C涂层的添加产生了致密的复合材料。研究了B4C涂层对复合材料拉伸强度和导热率的影响。当B4C完全覆盖在金刚石颗粒上时，复合材料的抗张强度（115 MPa）大大提高，远高于未涂覆金刚石/铜（60 MPa）的复合材料。同时，在B4C涂层金刚石/铜复合材料中实现了687 W / mK的高导热率。

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