Method for preparing Ti2AlC self-lubricating and heat-resisting structural material

A structural material and self-lubricating technology, which is applied in the field of preparation of self-lubricating heat-resistant structural materials, can solve the problems of high synthesis temperature, narrow synthesis phase zone, and restrictions on material preparation and application, and achieve the goal of improving sintering activity and reducing synthesis temperature Effect

Inactive Publication Date: 2011-08-03
GUANGZHOU RES INST OF NON FERROUS METALS
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  • Abstract
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AI Technical Summary

Problems solved by technology

However, due to the poor wettability of C and other components and the high-temperature volatilization of Al, Ti 2 AlC has a narrow synthetic phase region and a high synthesis temperature, generally higher than 1400°C, which limits the preparation and application of this material

Method used

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  • Method for preparing Ti2AlC self-lubricating and heat-resisting structural material
  • Method for preparing Ti2AlC self-lubricating and heat-resisting structural material

Examples

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Embodiment 1

[0011] Example 1: Using Ti powder, Al powder and carbon nanotubes as raw materials, adopting mechanical ball milling and spark plasma sintering technology to prepare Ti 2 AlC self-lubricating heat-resistant structural material, the steps are as follows:

[0012] 1.500 mesh, 99.9% purity of Ti powder and 325 mesh, 99.9% purity of Al powder, according to the atomic ratio Ti: Al is 2: 1.1 ingredients;

[0013] 2. Put the ingredients in step 1 into a vacuum stainless steel ball mill tank, pump the air, then fill it with argon with a purity greater than 99.99%, repeat the pumping and inflation 4 times, and then perform mechanical ball milling, ball milling process conditions: ball material The ratio is 20:1, the ball milling speed is 400rpm, and the ball milling time is 50h; after ball milling, the powder undergoes a lot of plastic deformation and alloying, and the particle size of some ball mill powders reaches 200nm;

[0014] 3. Mix the alloy powder with a large amount of plasti...

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Abstract

The invention relates to a method for preparing a Ti2AlC self-lubricating and heat-resisting structural material, which is characterized by comprising the following steps of: 1, batching Ti powder and Al powder according to an atomic ratio, and performing ball milling; performing physical dispersing on the TiAl powder subjected to the ball milling and a carbon nano tube or powdered graphite; and performing plasma sintering consolidation on the TiAl / carbon nano tube or the TiAl / powdered graphite which is subjected to the physical dispersing. In the method, the consolidation time is between 700 and 1,100 DEG C, and is about 300 to 700 DEG C lower than that of the prior art, so the Ti2AlC self-lubricating and heat-resisting structural material can be prepared at a low temperature.

Description

technical field [0001] The invention relates to a preparation method of a self-lubricating heat-resistant structural material used in aerospace and petrochemical fields. Background technique [0002] Ti 2 AlC is an M n+1 AX n Type compounds, which combine the excellent properties of metals and ceramics, such as oxidation resistance, thermal shock resistance, corrosion resistance, high elastic modulus, high fracture toughness, good electrical conductivity, etc. In addition, Ti 2 AlC also has excellent self-lubricating properties and good machinability. Therefore, this material can be used as an alternative for high-temperature engine connecting rods, aircraft gas turbine engine nozzle valves, supersonic aircraft, rocket engine nozzles and gaskets, high-temperature heat exchangers, gas turbine combustion chambers, and spacecraft thermal protection systems. Materials, as well as candidate materials for various wear-reducing parts working under high-temperature chemical cor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105
Inventor 杨非蔡一湘
Owner GUANGZHOU RES INST OF NON FERROUS METALS
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