Al2O3-Ti3AlC2 gradient ceramic and preparation method thereof

Abstract

The invention belongs to a preparation technology of an Al2O3-Ti3AlC2 material, particularly relates to Al2O3-Ti3AlC2 gradient ceramic and a preparation method thereof. The preparation method comprises the specific steps: (1) crushing Al2O3 and self-made Ti3AlC2 with a purity of 98% to a range of 0.1-10 [mu]m by using a pulverizing sample-preparing machine so as to form Al2O3 micron powder and Ti3AlC2 micron powder, and performing granulation on the powder; and (2) preparation of four granulation powder: performing granulation on the alumina granulation powder, performing granulation on composite granulation powder of Al2O3 and Ti3AlC2 at a ratio of (1.5-4):1, performing granulation on the composite granulation powder of Al2O3 and Ti3AlC2 at a ratio of 1:(1.5-4), mixing the obtained threegranulation powder with the Ti3AlC2 granulation powder, putting the mixture into a rotary mixer for mixing, discharging the material into a mold, laying the material evenly on the surface of the mold,and then performing dry pressing and pressure sintering so as to obtain the Al2O3-Ti3AlC2 gradient ceramic. The invention has the advantages that (1) the reaction sintering process is simple, and haslow cost; (2) the gradient ceramic has compositions of continuous distribution and no obvious interface layers.

Description

technical field [0001] The invention belongs to an Al 2 o 3 -Ti 3 AlC 2 Material preparation technology, specifically related to an Al 2 o 3 -Ti 3 AlC 2 Gradient ceramics and methods for their preparation. Background technique [0002] Al 2 o 3 Ceramics are currently the most widely used ceramics in high-temperature oxidizing environments. They have the advantages of high temperature resistance, high hardness, high compressive strength, low density, and high insulation. They are widely used in the aerospace field. , but due to the poor fracture toughness, thermal conductivity and thermal shock resistance of alumina ceramics, with the development of aerospace technology, single Al 2 o 3 It is difficult for ceramics to adapt to the working conditions of large temperature difference or different high and low temperature at both ends. [0003] Ti 3 AlC 2 is M 3 AX 2 A new type of cermet in the system. On the one hand, it has metal-like properties such as excelle...

AI Technical Summary

Problems solved by technology

At present, most gradient ceramics are prepared by multi-layer structure design, or materials with different composition ratios inside and outside. This preparation method has serious layering of ceramics, and local segregation is easy to occur. It is difficult to achieve a gradual and continuous distribution structure inside the ceramic. , will have a huge impact on the strength, toughness, thermal conductivity, and thermal shock resistance of ceramic materials.

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