(Ti, Cr) 2AlC solid solution composite material and preparation method thereof

Abstract

The invention discloses a (Ti, Cr) 2AlC solid solution composite material and a preparation method thereof. The preparation method comprises the following steps of: performing hot pressed sintering process on Ti power accounting for 40.92-70.11% of the total weight, Al power accounting for 20.15-24.02% of the total weight, C power accounting for 6.99-8.85% of the total weight and Cr2O3 power accounting for 0.88-28.07% of the total weight; and self-generating a granular reinforcement phase in the generation process of a substrate phase by using thermit reaction so as to prepare an aplitic composite material of which the substrate phase (Ti, Cr)2AlC is reinforced with an Al2O3 disperse phase; and performing solid solution strengthening on the substrate phase by using Cr generated by the reaction. Since the material has high composition adjustability, low firing temperature, even and dense structure, lower cost and excellent mechanical property, the application scope of the composite material is widened; in addition, by using the method, the firing temperature and the hot pressing pressure are reduced and micritization of crystals is realized.

Description

technical field [0001] The invention belongs to the field of composite material manufacturing, in particular to a (Ti, Cr) 2 AlC solid solution composite material and preparation method thereof. Background technique [0002] New Layered Ceramic Material Ti 2 AlC has attracted extensive research by many scholars at home and abroad for its excellent properties. Ti 2 AlC has the properties of metal, such as good thermal conductivity and electrical conductivity at room temperature, low Vickers hardness, high elastic modulus and shear modulus, and can be processed by traditional machining. It has plasticity; the material has the properties of ceramics, such as high melting point, high thermal stability and good oxidation resistance. However, this material also has disadvantages such as high sintering temperature, small temperature range, low hardness and low strength, which limit its further application. [0003] In recent years, in order to improve Ti 2 The properties of A...

AI Technical Summary

Problems solved by technology

As reported in the literature (Surface & Coatings Technology 203 (2009) 3595-3609), the use of elemental Cr for solid solution modification research has greatly improved the mechanical properties of the material, but the raw material cost of this method is high, and the synthesis temperature is relatively low. High, not conducive to its industrial production; there are also literature (Scripta Materialia 50 (2004) 897-901) reported the use of Al 2 o 3 Particles can pair with Ti 2 AlC has a similar structure to Ti 3 AlC 2 Research on the modification of material properties

However, the methods currently used are relatively simple, and at the same time, the preparation method is mainly based on Al 2 o 3 and Ti 2 AlC two powders are mixed for sintering, or Al, C, TiO 2 Ti is generated by high-temperature reduction reaction as raw material 2 AlC / Al 2 o 3 Composite materials, but no matter what kind of process, there are defects such as high reaction temperature and insufficient strength, which cannot be mass-produced

Patent (200910219290.8) reported the synthesis of Ti by high energy ball milling 2 AlC / Al 2 o 3 A new method for composite materials. The properties of the materials synthesized by this method have been greatly improved, but high-energy ball milling is difficult for industrial production. At the same time, there is no solid solution modification of the matrix phase.

Images