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Method for preparing Ti2AlC ceramic powder from TiAl powder

A technology of ceramic powder and powder, which is applied in the field of Ti2AlC ceramic powder preparation, can solve the problems of inaccurate control of the reaction, complex process and long time, and complicated reaction, so as to facilitate popularization and large-scale production, avoid easy damage, The effect of reducing the difficulty of sintering

Active Publication Date: 2016-10-19
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a kind of TiAl powder that is raw material 2 AlC ceramic powder preparation method, in order to solve existing preparation Ti 2 There are many reaction raw materials in the method of AlC powder material, the middle of the reaction is complicated, the reaction cannot be accurately controlled, the process is complicated and the time is long, and the prepared Ti 2 The purity of AlC powder is not enough, it is difficult to meet the needs of new application fields, Ti 2 The purity of AlC powder material is as high as 99wt%, and it is easy for industrial production

Method used

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  • Method for preparing Ti2AlC ceramic powder from TiAl powder
  • Method for preparing Ti2AlC ceramic powder from TiAl powder
  • Method for preparing Ti2AlC ceramic powder from TiAl powder

Examples

Experimental program
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Effect test

Embodiment 1

[0031] The raw material powder is mixed according to the molar ratio n(TiAl):n(TiC)=1:0.9, the raw materials are 4 kg in total, mixed evenly, add 3L of absolute ethanol, put into a 10L vibration ball mill, vibration frequency 50Hz, amplitude 5mm, ball mill Time 30 minutes. Pour out the ball-milled slurry, put it into a blast drying oven for low-temperature drying, and heat and dry it when the alcohol content drops below 85 wt%. The dried powder is then put into a vibrating ball mill and dry-milled with the same parameters for 10 minutes to obtain a uniformly mixed powder raw material. Put the raw material into a graphite mold with a diameter of 150mm and put it into a hot press sintering furnace, first apply a pressure of 5MPa, when the vacuum degree reaches 10 -3 At Pa, start to raise the temperature and pressurize again, raise the temperature to 1400°C, pressure 30MPa, hold the temperature for 2 hours and then cool with the furnace. Use a lathe to remove the surface of the...

Embodiment 2

[0033]The raw material powder is mixed according to the molar ratio n(TiAl):n(TiC)=1:0.95, the total raw material is 4 kg, mixed evenly, add 3L of absolute ethanol, put into a 10L stirring ball milling device, the stirring speed is 250r / min, the ball milling time 30 minutes. Pour out the ball-milled slurry, put it into a blast drying oven for low-temperature drying, and heat and dry it when the alcohol content drops below 90 wt%. The dried powder is put into a stirring ball mill and dry-milled with the same parameters for 10 minutes to obtain a uniformly mixed powder raw material. The prepared powder raw materials are dry-pressed with a hydraulic press and a stainless steel mold. Put 10 times of batching and molding and blocks into pure titanium sheaths with a diameter of 100mm and a length of 200mm, put these sheaths into a large-scale hot isostatic pressing sintering furnace, first vacuumize and then pass in argon protection to heat up To 1350 ℃ pressure 100MPa, heat prese...

Embodiment 3

[0035] The raw material powder is mixed according to the molar ratio n(TiAl):n(TiC)=1:0.925. The raw materials are 4 kg in total, mixed evenly, added with 3L of absolute ethanol, and loaded into a 10L vibrating ball mill with a vibration frequency of 50Hz and an amplitude of 5mm. Time 30 minutes. Pour out the ball-milled slurry, put it into a blast drying oven for low-temperature drying, and heat and dry it when the alcohol content drops below 90 wt%. The dried powder is then put into a vibrating ball mill and dry-milled with the same parameters for 10 minutes to obtain a uniformly mixed powder raw material. Put the raw material into a graphite mold with a diameter of 120mm and put it into a hot-press sintering furnace, first apply a pressure of 5MPa, when the vacuum degree reaches 10 -3 Argon gas was introduced at Pa, and the temperature was raised and the pressure was increased again, the temperature was raised to 1400°C, the pressure was 15MPa, and the pressure was maintai...

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Abstract

The invention relates to the field of ceramic materials, in particular to a method for preparing Ti2AlC ceramic powder from TiAl powder. The method comprises the steps that TiAl powder and TiC powder are used as reaction raw materials, wherein the mole ratio of n(TiAl) to n(TiC) is 1:(0.8-1.0); the TiAl powder and the TiC powder are subjected to wet process ball milling to obtain paste; the paste is dried and dried at vacuum, and the dried powder is subjected to dry milling; the dry-milled powder is formed and encased into a cover for hot isostatic pressing sintering or encased into a graphite die for vacuum hot pressed sintering; the sintered material is machined to remove possible pollutant on the surface, and then is crushed, screened, pickled, dried and the like to obtain the power. By adopting TiAl powder as the raw material, the intermediate reaction step is omitted, the obtained material is good in quality and has the purity as high as 99wt%, and can be used as a surface engineering, reinforcing phase and novel binary layered material precursor and other materials.

Description

technical field [0001] The invention relates to the field of ceramic materials, specifically a kind of TiAl powder as raw material. 2 AlC ceramic powder preparation method. Background technique [0002] As a ternary layered machinable ceramic, Ti 2 AlC ceramics have the structure and characteristics of MAX phase group materials. The structure of the MAX phase can generally be described as: the pure A atomic layer is inserted into the crystal close-packed M atomic clock, and the X atoms are filled in the octahedral gap composed of M. to Ti 2 For AlC ceramics, M is a Ti atom, A is an Al atom, and X is a C atom. This structure enables MAX materials to have covalent bonds, metal bonds, and ionic bonds at the same time, as well as the properties of both ceramics and metals, such as: electrical conductivity, good chemical stability, and high melting point. Specific to Ti 2 As far as AlC ceramics are concerned, they have high mechanical strength, good oxidation resistance, go...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/56C04B35/626C04B35/645C04B41/91
CPCC04B35/5618C04B35/6261C04B35/645C04B35/6455C04B41/009C04B41/5315C04B41/91C04B2235/602
Inventor 柏春光谢曦郑卓崔玉友杨锐
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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