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

Abstract

The invention discloses a (Ti, Nb) 3AlC2 / Al2O3 solid solution composite material and a preparation method thereof. The preparation method comprises the following steps: hot pressing and sintering the following materials in percentage by weight: 45.87-72.95% of Ti powder, 14.02-19.10% of Al powder, 9.23-12.25% of C powder and 0.78-25.81% of Nb2O5 powder, wherein a particle wild phase grows in the matrix phase generating process via thermit reaction, a fine crystal composite material of Al2O3 dispersed phase strengthened matrix phase Ti3AlC2 is prepared, and Nb generated by the reaction is usedfor carrying out solid solution strengthening on the matrix. Because the material ingredients have big adjustability, low firing temperature, even and compact structure, lower cost and excellent mechanical property, the application range of the composite material is expanded. In addition, the method lowers the firing temperature and the hot-press pressure and realizes crystalline grain micritization in the quick firing process.

Description

technical field [0001] The invention belongs to the field of composite material manufacturing, in particular to a (Ti, Nb) 3 AlC 2 / Al 2 o 3 Solid solution composite material and its preparation method. Background technique [0002] New Layered Ceramic Material Ti 3 AlC 2 It has attracted extensive research by many scholars at home and abroad for its excellent performance. Ti 3 AlC 2 It 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 is plastic; the material also 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...

AI Technical Summary

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. In the same principle, we can use Nb elements for solid solution modification. , but the raw material cost of this method is higher, and the synthesis temperature is higher at the same time, 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.