Eutectic powder additive for producing ceram and ceramic solder and preparation method thereof

This invention relates to eutectic powders additive used for production of ceramics or ceramics solder and its preparation method. The method comprises preparing mixed powers by mixing any eutectic composition of C, B, Si, M, Me. TM, MO, TMO2, Me2O3, Me4Al2O9, MAl2O4, MeAlO3. Me3Al5O12, TMN, TMC, TM2C, TMSi2, TMB2, TMB. MeB6, MeN, Al2O3, Si3N4, SiC, B4C or a composite from the mixed powders by high-temperature melting solidification, crushing, pulverizing to obtain blending with eutectic composite structure. The preparation method of high-performance structural ceramics of MoSi2, TiB2, Si3N4, SiC, cubic BN and B4C from the eutectic ceramic powders has excellent technical performance and wide application. Moreover, the sintering temperature and sintering pressure are decreased and production cost and investment cost are significantly lowered.