BC 涂层增强铜-金刚石复合材料的拉伸强度和导热性能。

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

机构信息

College of Construction Engineering, Jilin University, Changchun, 130026, People's Republic of China.

Key Lab of Drilling and Exploitation Technology in Complex Conditions, Ministry of Land and Resources, Changchun, 130061, People's Republic of China.

出版信息

Sci Rep. 2017 Sep 6;7(1):10727. doi: 10.1038/s41598-017-11142-y.

DOI:10.1038/s41598-017-11142-y

PMID:28878290

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5587756/

Abstract

Boron carbide (BC) coating on diamond particle is synthesized by heating diamond particles in a powder mix of HBO 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 BC-coated diamond particles were made by powder metallurgy. The addition of BC coating gave rise to a dense composite. The influence of BC coating on both tensile strength and thermal conductivity of the composite were investigated. When the BC 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 BC-coated-diamond/Cu composites.

摘要

通过在 HBO 和 B 的粉末混合物中加热金刚石颗粒，在金刚石颗粒上合成碳化硼 (BC) 涂层。研究了金刚石颗粒上碳化硼涂层的组成、键态和覆盖率。碳化硼涂层有利于在金刚石 (100) 表面而不是金刚石 (111) 表面生长。通过粉末冶金法制备了 BC 涂层金刚石颗粒增强的 Cu 基复合材料。BC 涂层的加入导致复合材料致密。研究了 BC 涂层对复合材料拉伸强度和导热系数的影响。当 BC 完全覆盖金刚石颗粒时，复合材料的拉伸强度（115MPa）大大提高，远高于未涂层金刚石/Cu（60MPa）复合材料。同时，BC 涂层金刚石/Cu 复合材料的导热系数达到 687W/mK。