Microstructure, electric, and thermal properties of the Ta-Cu composite is evaluated for the application in electric contact materials. This material has the potential to be used in a medium for a high current range of current conditions, replacing Ag-MO, W, and WC containing materials. The optimized SPS process conditions are a temperature of 900°C for a 5 min holding time under a 30 MPa mechanical pressure. Comparative research is carried out for the calculated and actual values of the thermal and electric properties. The range of actual thermal and electric properties of the Ta-Cu composite are 50~300W/mk and 10~90 %IACS, respectively, according to the compositional change of the 90 to 10 wt% Ta-Cu system. The results related to the electric contact properties, suggest that less than 50 wt% of Ta compositions are possible in applications of electric contact materials.

Citations

Citations to this article as recorded by  

• Formation mechanism, microstructural features and dry-sliding behaviour of “Bronze/WC carbide” composite synthesised by atmospheric pulsed-plasma deposition
  V.G. Efremenko, Yu.G. Chabak, V.I. Fedun, K. Shimizu, T.V. Pastukhova, I. Petryshynets, A.M. Zusin, E.V. Kudinova, B.V. Efremenko
  Vacuum.2021; 185: 110031.     CrossRef

Titanium alloys are extensively used in high-temperature applications due to their excellent high strength and corrosion resistance properties. However, titanium alloys are problematic because they tend to be extremely difficult-tocut material. In this paper, the powder synthesis, spark plasma sintering (SPS), bulk material characteristics and machinability test of hybrid Ti₂AlC ceramic bulk materials were systematically examined. The bulk samples mainly consisted of Ti₂AlC materials with density close to theoretical value were synthesized by a SPS method. Random orientation and good crystallization of the Ti₂AlC was observed at 1100°C for 10 min under SPS sintering conditions. Scanning electron microscopy results indicated a homogeneous distribution and nano-laminated structure of Ti₂AlC MAX phase. The hardness and electrical conductivity of Ti₂AlC were higher than that of Ti 6242 alloy at sintering temperature of 1000°C~1100°C. Consequently, the machinability of the hybrid Ti₂AlC bulk materials is better than that of the Ti 6242 alloy for micro-EDM process of micro-hole shape workpiece.

Citations

Citations to this article as recorded by  

• Evaluation of Material Characteristics with Sintering Temperature in Ti2AlC MAX Phase Material using Spark Plasma Sintering Method
  Chang-Hun Lee, Gyung Rae Baek, Hee Sang Jung, Young-Keun Jeong, Myung Chang Kang
  Journal of Korean Powder Metallurgy Institute.2015; 22(3): 175.     CrossRef