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

Abstract

The invention discloses a (Ti, Mo)2AlC / Al2O3 solid solution composite material and a preparation method thereof. The preparation method comprise the following steps of: performing a hot pressed sintering process on 46.06 to 70.30 weight percent of metal Ti powder, 20.14 to 23.90 weight percent of Al powder, 6.75 to 8.85 weight percent of carbon powder and 0.71 to 23.29 weight percent of metallic oxide MoO3 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 Ti2AlC; and performing solid solution strengthening on the matrix phase by using Mo 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 relates to the field of composite material manufacturing, in particular to a (Ti, Mo) 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 attracted extensive research by many scholars at home and abroad for its excellent properties. Ti 2 AlC has the properties of metals, such as good electrical conductivity and thermal conductivity, low Vickers hardness, high elastic modulus and shear modulus at room temperature, and can be processed by traditional machining at room temperature. It is thermoplastic at low temperature; 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. [...

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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. The same method can use Mo elements for solid solution modification research, but The raw material cost of this method is higher, and the synthetic temperature is higher at the same time, is unfavorable for its industrial production; 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 various processes have problems such as high reaction temperature and relatively low 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.

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