Preparation of W-Mo Composites and Their Characteristic Wave Impedance

Dense W-Mo composites with different mass fractions of W and Mo were prepared at same temperature (1 473 K) and pressure (30 MPa) by using spark plasma sintering technique. The transverse and longitudinal wave velocities of the samples were accurately measured using ultrasonic pulse echo overlap method, so the characteristic wave impedance values of the samples were then obtained. The results of phase composition and electron probe microscope analysis show that the W-Mo composite can be treated as a mechanical mixture system and high coherence between W and Mo grains is achieved due to sintering additives. Therefore, ideal mixture model was adopted to estimate the characteristic wave impedance of W-Mo composites. Comparisons with the experimental results demonstrate that the suggested model is sufficiently accurate to predict the wave impedance value of W-Mo composites.