SiC has been used in many area because of its high strength at high temperature、anti-oxidization,anti-wear,low coefficient of thermal expansion,high hardness,anti-heat shock and anti-chemic erosion.SiC is very hard to sinter to high density,because of it's high strength covalent bond and low self diffusion coefficient.Without sinter additives,pure SiC is very difficult to densify with traditional techniques.However,highly densified SiC ceramics with good property can be obtained by using ultra high p...