The W-Co compound precursor powderswith an average particle size of 60 nm were prepared by thechemical coprecipitation as the raw materials of Na<sub>2</sub>WO<
The system DyBa<sub>2</sub>Cu<sub>3-x</sub>Fe<sub>x</sub>O<sub>7-δ</sub>(x=0.00,0.03,0.18)has been studied using X-ray photoelectron spec-troscopy.XPS results sh
In the paper, the effect of heat-treatment on thestrength and toughness of AlN-SiC whisker composites with Y<sub>2</sub>O<sub>3</sub>+SiO<sub>2</sub> additives