Development of tool ceramic materials based on ultra-dispersed powders of refractory nitrides

Subject of investigation: ultra-dispersed powders of nitrides of silicon, aluminium and titanium, aluminium and yttrium oxides and materials based on them. The work establishes braking of the recrystallization by way of introduction of Y_2O_3 and AIN and use of a joint synthesis of the initial powders, which brings about changes in their phase composition and grain-limit phase of materials based on them. The materials based on beta -sialone and obtained from the charge of a high degree of purity and homogeneity and with the minimum amount of additives possess the maximum stability of the high-temperature hardness. The results of the work include the development of the process of obtaining cutting plates, determination of the optimum content of the activating and strengthening components and tribotechnical peculiarities of the produced materials, determination of the governing influence of the strengthening component on the wear resistance in cutting hardened steel. A new composition of the material and a method of production of a composite charge are developed. The process of production of cutting plates is introduced in the pilot-scale production of the Experimental Design and Technical Bureau of the Metal Science Problems Institute of the Ukrainian Academy of Sciences. The wear resistance of cutting plates has become 2-3 times higher. Field of application: production of wear-resistant tool and constructional ceramic materials to be used in aggressive media and at high temperaturesAvailable from VNTIC / VNTIC - Scientific & Technical Information Centre of RussiaSIGLERURussian Federatio