(Ti, V)2AlC/Al2O3 solid solution composite material and preparation method thereof

Abstract

The invention discloses a (Ti, V)2AlC / Al2O3 solid solution composite material and a preparation method thereof. A hot pressed sintering process is carried out on Ti powder occupying 47.01-70.41% of the total weight, Al powder occupying 20.19-25.98% of the total weight, C powder occupying 7.21-8.87% of the total weight and V2O5 powder occupying 0.54-19.80% of the total weight, and a particle reinforcing phase is generated in the generation process of a matrix phase through thermit reaction, so as to prepare a fine crystal composite material that the matrix phase is strengthened by an Al2O3 dispersed phase; V generated in the reaction is utilized to carry out solid solution strengthening on the matrix phase; as the components of the material have large adjustability, low firing temperature, uniform and compact structure, lower cost and excellent mechanical properties, the application range of the composite material is broadened; and in addition, by the method, the firing temperature and the hot-pressing pressure are lowered, and the crystal particle micro crystallization is realized in the quick firing.

Description

technical field [0001] The invention belongs to the field of composite material manufacturing, in particular to a (Ti, V) 2 AlC / Al 2 o 3 Solid solution composite material and its preparation method. Background technique [0002] New Layered Ceramic Material Ti 2 AlC has been widely valued by material scientists for its excellent properties. First, 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. At the same time, 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 AlC materia...

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Problems solved by technology

As reported in the literature (Scripta Materialia 53 (2005) 1369-1372), the use of simple V elements for solid solution modification research has greatly improved its mechanical properties, but this method has high raw material costs and high synthesis temperatures. It is not conducive to its industrial production; there are also literature (ScriptaMaterialia 50 (2004) 897-901) reported that the use of Al 2 o 3 Particles can pair with Ti 2 AlC has a similar structure to Ti 3 AlC 2 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 reduction reaction at high temperature as raw material 2 AlC / Al 2 o 3 Composite materials, but no matter what kind of process, there is high reaction temperature and insufficient strength, so it 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.

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