Obtaining molybdenum-copper composite for effective thermal control in electronic systems

Alexander Sivkov,Yuliya Polovinkina,Yuliya Shanenkova,A.A Kozyreva,G.V Kuznetsov,A.O Zhdanova

doi:10.1051/matecconf/201714101036

Abstract

In the article, the molybdenum and copper powders, obtained by electric explosion of wires and plasma-dynamic method, respectively, were sintered by spark plasma sintering technology, in order to obtain bulk sample based on them. X-ray diffractometry and scanning electron microscopy were carried out to study the chemical composition and structure of the resulting ceramics. XRD analysis showed that the product consisted of the following main phases such as molybdenum of a cubic crystalline structure (space group Im3m, No. 229) and copper of cubic system (space group Fm-3m, No. 225). The results of scanning electron microscopy indicated that the sintered sample had heterogeneous structure with the presence of small pores. Nonetheless, the mechanical properties such as hardness (Vickers hardness of 292 HV) and thermal conductivity (140.53 W / m · °C) are good enough that allows considering the proposed synthesizing methods as well as sintering technology as promising for creating the Cu-Mo ceramics with high-mechanical properties.

Highlights

Increasing the energy density is one of the biggest problems for thermal regulation in small electronic devices
Electronic components are usually installed on substrates or plates, which act as the heat removal elements and provide an effective thermal control [3-5]
The bulk ceramics sample based on molybdenum and copper powders was sintered using the spark plasma sintering technology

Summary

Introduction

Increasing the energy density is one of the biggest problems for thermal regulation in small electronic devices. Not all materials have suitable properties for reliable heat dissipation. In such substrates, the thermal conductivity and thermal expansion characteristics of the semiconductor must be matched with each other in the optimal way. Unlike the existing methods [6, 7], this technology makes it possible to obtain bulk samples based on powders in a short period of time that allows preserving the finegrained structure of the material and its unique properties. A unique method for obtaining ultrafine copper powders based on using coaxial magnetoplasma accelerator is shown [10-12]. In comparison with other methods for obtaining ultrafine powders [13, 14], the discussed technique is more simple (working time less than 1 ms) and doesn’t require preliminary preparation of the main precursors

Materials and experimental procedures

Results and discussion

Conclusion