| Abstract [eng] |
An electrical conductivity measurement tool is needed for characterization of Titanium based composite samples. The powder-based metal matrix composite samples are novel, fabricated by using high voltage electric discharge and spark plasma sintering processes. They have potential usage in the aviation industry. The composite samples are small and have a pellet shape. Other research that measured electrical conductivity of Titanium based composites was reviewed. A collinear four-point probe method was chosen for measurement of electrical conductivity. Needle like test probes were used to contact the tested sample. Other aspects of the measurement setup are discussed and selected according to relevant literature. A simulation was performed using COMSOL software to validate the measurement method. Furthermore, a simulation performed for contact force of the probes was performed. A 3D model of the measurement tool was created and designed. It was chosen to implement a sample holder and a probe holder for fixing the sample and test probes. The needle holder has the function to rotate. A linear drive is used to move the sample into the test probes. A Peltier element is used to heat or cool the sample. A temperature sensor is used to monitor the temperature of the Peltier element. The full width of the measurement tool is 120 mm, length – 228 mm and height – 323 mm. The measurement setup is controlled with Arduino board. An electrical schematic was presented, connections and components were explained. The measurement setup was fabricated using various operations, such as milling, turning, drilling. The measurement setup was tested and validated by using a copper sample. Six Titanium composite samples electrical resistance was measured, and electrical conductivity calculated. Furthermore, samples were measured at different temperatures and resistivity dependence to temperature was presented. Experimental results are compared to similar research results. Measurement setup was evaluated from economical point of view and cost analysis was performed. |
