Method for preparing multiple phase confusion TiB*-TiC ceramic particle gradient enhancement metal-based complex material

Abstract

A method for preparing the multiple-phase hybrid TiB2-TiC ceramic particles gradient reinforced steel matrix composite material relates to a method for preparing the ceramic particles reinforced metal matrix composite material. The concrete technique includes two stages of preparing the reactant green compact and the burning synthesizing reaction in the mold cavity: 1) adopting Cr, Ti and C powder as reactant, mixing to uniform according to a definite proportion and pressing to blank; 2) placing the reactant green compact which has done with preprocessing to the specific position or area of the casting part that needs intensifying in the mold, the high-temperature metallic molten steel to induce the burning synthesizing reaction of the green compact, and the TiB2-TiC multiple-phase hybrid ceramic particles are formed at the original position. Thereby not only the toughness of the metallic matrix itself is guaranteed but also the high hardness and abrasion resistance capability of the servicing area or position are increased. As the ceramic particles are formed by reaction the ceramic particles have the advantages of clean surface, tiny dimension and regular shape; besides, the added Cr can get a function of reinforcing the solution. The technique of the invention is easy and reliable and is easy to generalize and apply.

Description

technical field [0001] The invention relates to a preparation method of a metal-matrix composite material, in particular to a preparation method of a steel-matrix composite material reinforced by a multiphase hybrid ceramic particle gradient. Background technique [0002] At present, most ceramic particle reinforced metal matrix composites are integrally reinforced. However, in many cases, it is not required that the material as a whole be particle-reinforced. Take the shovel teeth of an excavator and the punch mold used for forging as an example: for the shovel teeth of an excavator, only the tip of the shovel teeth needs to have very high wear resistance, while the shovel teeth need to have very good toughness , to prevent failure due to early fracture during use; for the punch die used for forging, only the head of the die needs to have very high wear resistance, thermal fatigue resistance and oxidation resistance, etc., while the body of the die only needs High strengt...

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Problems solved by technology

Since Al powder is easy to vaporize during the reaction process, it will lead to the formation of pores in the composite material, so that the potential of the composite material cannot be fully utilized.

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