[T13] Non Ferrous Materials

[15P-T13-05] Properties Evaluation of Copper-Titanium Composites by a Spark Plasma Sintering Process

*M. Yang^1,3, B. Park^1,3, I. Oh¹, H. Moon², H. Park¹ (1.Purpose Built Mobility Group, Korea Institute of Industrial Technology, Korea, 2.Extreme Process Control Group, Korea Institute of Industrial Technology, Korea, 3.Division of Advanced Materials Engineering, Chonnam National University, Korea)

Keywords:Cu-Ti composites, spark plasma sintering process, microstructure, mechanical properties, thermal properties

The Cu-Ti powders were mixed using a horizontal ball milling and fabricated by a spark plasma sintering process at a sintering temperature of 850℃ and heating rate of 30 ℃/min under 40 MPa. The phase of Cu3Ti was detected upon the Ti content was 4 wt.% or higher, which affected the thermal properties. The thermal conductivity decreased from 262.74 to 46.10 W/m·K according to increase the Ti contents. The Ti present in the heat transfer path in Cu matrix acted as an obstacle to heat diffusion. As the Ti contents increased, the Vickers hardness of Cu-Ti composite increased from 60.19 to 205.20 kg/mm2. In contrast, the crystallite size decreased from 66.63 to 22.43 nm. The Ti particles suppressed the grain growth of the Cu matrix, resulting in a decrease in crystallite size, which contributed to the improvement of the mechanical properties.