Study On The Properties Of Non-stoichiometric TiC_x And Refractory Compoundssolid-phase Sintered Body

Good performance of the binder is the preparation of high quality PCD, subject usingthe method of mechanical alloying preparation of stoichiometric ratio TiCx, under thecondition of high pressure with the AlN, stratification of of the TaC separately and mixedsintering, the interface area atomic diffusion phenomenon, improve sinter materialperformance.TiC0.4and AlN, stratification of the TaC respectively for high pressure sintering,pressure is5.5GPa, temperature1500℃, holding time15min. The experimental resultsshow that the TiC0.4/AlN interface appear high N content area, lateral TiC0.4observedobviously Al, TiC0.4/TaC interface observed apparent diffusion area, Ti, Ta elements existobvious ladder distribution, interface atomic diffusion phenomenon is obvious.TiC0.4and AlN in different ratio high pressure sintering, generates TiCxNyand Al2O3phase. Sintered body after the hardness increases with the increase of the content of AlNfirst decreases, and AlN volume fraction is20%, the sintering temperature of1500℃when the hardness of the sintered body reached a maximum of19.63GPa; AlN volumefraction of20%, when the sintering temperature of1400℃sintering body fracturetoughness optimal,6.25MPa·m1/2. TiC0.4with TaC different ratio in high pressuresintering, TaC volume fraction was25%the highest hardness,15.29GPa; Contrastdifferent time of heat preservation, heat preservation for10min when reach maximumhardness of the sintered body16.68GPa,20min at the optimal, fracture toughness is4.90MPa·m1/2.TiC0.4/AlN/TaC three-phase mixed sintering get TAT sintered body series,1500℃, a5.5GPa, different ratio of high pressure sintering heat preservation for10min, TAT-6maximum hardness,21.13GPa, TAT-3the optimal, fracture toughness is6.32MPa·m1/2.TaC volume fraction in15~25%range, is advantageous to the TiC0.4/AlN/TaC three-phasecomposite block material performance optimization.