Method for synthesizing TiCx particle enhanced nickel base composite material by reaction in-situ

Abstract

The invention relates to a method for synthesizing TiCx particle enhanced nickel base composite material by reaction in-situ, belonging to the field of composite materials. A preparation process comprises the preparation of mixed powder, the preparation of powder chip as well as a smelting and casting process, wherein in the preparation of mixed powder, the powder material consists of Ti, C, Al, Fe and Mo, wherein Al powder accounts for 8-12wt.%, Fe powder accounts for 12-15wt.%, Mo powder accounts for 3-5wt.%, graphite C powder accounts for 8-12wt.% and the balance of Ti powder, the weight ratio of Ti powder to C powder in the powder satisfies a relation of (5-6.7):1; in the preparation of powder chip, Ni foil is rolled into a cylinder with the diameter of 16-25mm, the mixed powder after ball milling and material mixing is filled into the cylinder; and in the smelting and casting process, TiC[X] / Ni composite material is prepared by using frequency induction melting furnace in vacuum. The invention has the advantages that the prepared TiCx / Ni composite material has the volume fraction of TiC[X] / Ni of 20-40%, the density of the TiCx / Ni composite material is approximate to 100%; and the high temperature strength and rigidity of the TiCx / Ni composite material are remarkably higher than that of normal nickel base superalloy.

Description

technical field [0001] The invention belongs to the field of composite materials, in particular to an in-situ reaction synthesis of TiC x A method for particle-reinforced nickel-based composites, using melting and casting to synthesize 20-40% volume fraction TiC in situ x Particle-reinforced nickel-based composites. Background technique [0002] Particle-reinforced metal matrix composites have become an important part of composite materials due to their excellent properties such as high specific strength and specific modulus, high temperature resistance, wear resistance, small thermal expansion coefficient, and good dimensional stability. Has been developed by leaps and bounds. Particle-reinforced metal matrix composites take into account the good toughness of metals and the high wear resistance of ceramics, and have excellent properties unmatched by single metal or ceramic materials. Due to the high preparation cost and complicated process of metal matrix composites, its...

AI Technical Summary

Problems solved by technology

Traditional addition of TiC x Particle preparation of TiC x Particle-reinforced nickel-based composites (hereinafter referred to as TiC x / Ni composite material) methods mainly include powder metallurgy, casting, vacuum liquid metal infiltration method, etc., and its main disadvantages are poor wettability between ceramic phase and bonding phase, complicated process and high cost. TiC x Ceramic phase volume fraction is generally less than 15%

[0004] Preparation of TiC by Melting and Casting x For Ni / Ni composite materials, if the method of directly adding Ti and C blocks or powders into the Ni melt is used, the limitations are: (1) Since the specific gravity of Ti and C is lower than that of Ni melt, C and Ti will float up. And the formation of slag, incomplete Ti-C reaction and other problems; (2) The addition of Ti and C is limited, and the formed TiC x / Ni composites, TiC x Ceramic phase volume fraction is generally less than 15%

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