(Ti, Zr)3AlC2/Al2O3 sosoloid composite material and preparation method thereof

Abstract

The invention relates to a (Ti, Zr)3AlC2 / Al2O3 sosoloid composite material and a preparation method thereof. The preparation method comprises the following steps: carrying out hot pressed sintering under the conditions that Ti powder accounts for 41.33-72.79% of the total weight, Al powder accounts for 14.01-18.45% of the total weight, C powder accounts for 8.81-12.23% of the total weight and ZrO2 powder accounts for 0.97-31.41% of the total weight; automatically generating a particle enhanced phase through a thermit reaction in a matrix phase generating process, thus obtaining a fine grain composite material with Al2O3 dispersed phase reinforced matrix phase Ti3AlC2; and carrying out solid solution strengthening on the matrix phase with Zr generated by the reaction. The material has high adjustability of components, low firing temperature, uniform and compact structure, low cost and excellent mechanical property, thereby widening the application range of the composite material. Besides, by adopting the method, the firing temperature and pressure in the hot pressing process are reduced, and the micro crystallization of grains is realized in the rapid firing process.

Description

technical field [0001] The invention belongs to the field of composite material manufacturing, in particular to a (Ti, Zr) 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 is a ternary layered easy-to-process material with the advantages of both ceramics and metals, belonging to the hexagonal crystal system. It has low hardness, low density, good electrical and thermal conductivity, superior thermal shock resistance, high elastic modulus and shear modulus at room temperature, and has plasticity and good resistance at higher temperatures. Oxidation properties. 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] Recently,...

AI Technical Summary

Problems solved by technology

As reported in the literature (Scripta Materialia 53 (2005) 1369-1372), the study of solid solution modification using element V has greatly improved its mechanical properties. In the same principle, we can use Zr element 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 Ti3AlC is generated by reduction reaction at high temperature as raw material 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.