Nb元素对铜-金刚石复合材料界面改性的研究

Research on Interface Modification of Copper-Diamond Composite Materials by Nb Element

采用粉末冶金法制备铜/金刚石复合材料,研究不同含量活性元素Nb对铜界面改性的影响机制以及对铜/金刚石复合材料的热导率的影响,利用XRD、SEM、EDS和导热系数测定仪分析复合材料的界面和热导率。结果表明,随着Nb含量的添加,能够在烧结过程中形成碳化物界面层,铜和金刚石界面缺陷逐渐减少,界面结合逐渐转好。在1%的含量时,复合材料的热导率达到370.3 W/(m·K),相比纯铜/金刚石复合材料提高1.34倍,但当含量超过1 vol.%,碳化铌中间层变厚,由于碳化铌自身热导率较低,导致复合材料的热导率降低。

Copper/diamond composite materials prepared via powder metallurgy were used to study the influence of different contents of the active element Nb on the modification mechanism of the copper interface and the thermal conductivity of the copper/diamond composite material.The interface and thermal conductivity of the composite material were characterized by XRD,SEM,EDS,and thermal conductivity coefficient tester.The results showed that with the addition of Nb content,a carbide interface layer could be formed during the sintering process,and the defects at the interface between copper and diamond gradually decreased,and the interface bonding gradually improved.When the content was 1%,the thermal conductivity of the composite material reached 370.3 W/(m·K),which was 1.34 times higher than that of the pure copper/diamond composite material.However,when the content exceeded 1%,the thickness of the niobium carbide intermediate layer increased.Due to the low thermal conductivity of niobium carbide itself,the thermal conductivity of the composite material decreased.