(Ti, V)3AlC2/Al2O3 solid solution composite material and preparation method thereof

Abstract

The invention discloses a (Ti, V)3AlC2/Al2O3 solid solution composite material and a preparation method thereof. The preparation method comprises the following steps of: performing a hot pressed sintering process on 51.88 to 73.14 weight percent of Ti powder, 14.05 to 20.23 weight percent of Al powder, 10.23 to 12.28 weight percent of C powder and 0.53 to 17.66 weight percent of V2O5 powder; automatically generating a particle reinforced phase in the process of generating a matrix phase through a thermit reaction to prepare a fine crystal composite material of Al2O3 dispersed phase reinforced matrix phase Ti3AlC2; and performing solid solution strengthening on the matrix phase by using V generated by a reaction. The material has high component adjustability, a low firing temperature, a uniform and compact structure, relatively low cost and a high mechanical property, and the application range of the composite material is widened; in addition, the firing temperature and hot-pressing pressure are reduced and the sitallization of crystal grains is realized during fast firing by the method.

Description

technical field [0001] The invention belongs to the field of composite material manufacturing, in particular to a (Ti, V) 3 AlC 2 / Al 2 o 3 Solid solution composite material and its preparation method. Background technique [0002] Recently, a new class of nano-layered ceramic materials Ti 3 AlC 2 It has attracted extensive research by many scholars at home and abroad for its excellent performance. Ti 3 AlC 2 Combines the properties of metal and ceramic. Like metal, it has 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. Plasticity; the material has a high melting point like ceramics, 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 order to ...

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Problems solved by technology

As reported in the literature (Scripta Materialia 53 (2005) 1369-1372) using elemental V element pairs with Ti 3 AlC 2 Ti with a similar structure 2 AlC for solid solution modification research, so that Ti 2 The mechanical properties of AlC materials have been greatly improved, but the raw material cost of this method is high, and the synthesis temperature is high, which is not conducive to its industrial production; 2 o 3 Particle energy 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 3 AlC 2 Two kinds of powders are mixed for sintering, or Al, C, TiO 2 Ti is generated by reduction reaction at high temperature as raw material 3 AlC 2 / 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

Literature (Advanced Powder Technology 03 (2010) 1-4) reported the synthesis of Ti by high energy ball milling 3 AlC 2 / 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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