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Preparation method of high-purity MoAlB ceramic powder and compact block body

A ceramic powder, high-purity technology, applied in the field of ceramic material preparation, can solve the problems of long synthesis time, low efficiency, time-consuming and energy-consuming, etc., and achieve the effects of improving purity, simple process flow, and improving production efficiency.

Inactive Publication Date: 2017-12-26
BEIJING JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The above-mentioned preparation method of MoAlB has the problems of long synthesis time, time and energy consumption, low efficiency, and impurities in the synthetic material. Therefore, shortening the material synthesis time and improving the purity of the sample are of great significance for promoting the large-scale production of MoAlB materials.

Method used

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  • Preparation method of high-purity MoAlB ceramic powder and compact block body
  • Preparation method of high-purity MoAlB ceramic powder and compact block body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0024] According to the molar ratio of Mo:Al:B=1:1.1:1, weigh 14.06 grams of Mo powder, 4.35 grams of Al powder, and 1.59 grams of B powder. The above-mentioned ingredients were put into a ball mill jar and mixed for 5 hours. The uniformly mixed ingredients are put into stainless steel molds and compacted on a tablet press. Put the above blank into a graphite mold, place the graphite mold in a vacuum sintering furnace, and raise the temperature of the furnace to 1000°C at a heating rate of 10°C / min under an argon atmosphere, hold the temperature for 120 minutes, and then lower it to room temperature. A high-purity MoAlB material can be obtained. The above-mentioned MoAlB material is pulverized in a ball mill and passed through sieves of different meshes to obtain MoAlB powders with different particle sizes. Carry out X-ray diffraction analysis to the sample obtained, its XRD diffraction pattern sees attached figure 1 , it can be seen from the XRD results that a high-purity ...

Embodiment approach 2

[0026] According to the molar ratio of Mo:Al:B=1:1.1:1, weigh 14.06 grams of Mo powder, 4.35 grams of Al powder, and 1.59 grams of B powder. The above-mentioned ingredients were put into a ball mill jar and mixed for 10 hours. Put the uniformly mixed ingredients into a stainless steel mold and compact it on a tablet press, put the above green body into a graphite mold, place the graphite mold in a vacuum sintering furnace, and heat up at a rate of 20°C / min under an argon atmosphere. Raise the furnace temperature to 1100°C, hold the temperature for 90 minutes, and then lower it to room temperature to obtain high-purity MoAlB material. The above-mentioned MoAlB material is pulverized in a ball mill and passed through sieves of different meshes to obtain MoAlB powders with different particle sizes. The obtained sample was subjected to X-ray diffraction analysis, and the XRD result was the same as that of Embodiment 1.

Embodiment approach 3

[0028] According to the molar ratio of Mo:Al:B=1:1.3:1, weigh 13.53 grams of Mo powder, 4.95 grams of Al powder, and 1.52 grams of B powder. The above-mentioned ingredients were put into a ball mill jar and mixed for 24 hours. Put the uniformly mixed ingredients into a stainless steel mold and compact it on a tablet press, put the above green body into a graphite mold, put the graphite mold in a vacuum sintering furnace, and heat up at a rate of 30°C / min under an argon atmosphere. Raise the furnace temperature to 1200°C, hold the temperature for 60 minutes, and then lower it to room temperature to obtain high-purity MoAlB material. The above-mentioned MoAlB material is pulverized in a ball mill and passed through sieves of different meshes to obtain MoAlB powders with different particle sizes. The obtained sample was subjected to X-ray diffraction analysis, and the XRD result was the same as that of Embodiment 1.

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Abstract

The invention discloses a preparation method of high-purity MoAlB ceramic powder and a compact block body. A method for preparing MoAlB powder is characterized in that Mo powder, Al powder and B powder are used as raw materials; proportioning is performed according to the mole ratio of Mo to Al to B being 1:(1.1 to 1.3):1; dry blending is performed for 5 to 24h in a ball grinding mill; after the mixed materials are subjected to blank pressing on a tableting press; blanks are put into a pressure-free furnace; under the argon gas atmosphere, the furnace temperature is raised to 1000 to 1300 DEG C at the velocity of 10 to 50 DEG C / min; heat insulation is performed for 10 to 120min; then, the temperature is lowered to room temperature; the high-purity MoAlB material is obtained. The obtained MoAlB material is crushed in the ball grinding mill and is sieved by a sieve with different meshes, so that the MoAlB powder with different particle size is obtained. A method for preparing the compact block body is characterized in that Mo powder, Al powder and B powder are used as raw materials; proportioning is performed according to the mole ratio of Mo to Al to B being 1:(1.1 to 1.3):1; dry blending is performed on the material for 5 to 24h in the ball grinding mill; mixed materials are put into a pressure-free furnace; under the argon gas atmosphere, the furnace temperature is raised to 1000 to 1300 DEG C at the velocity of 10 to 50 DEG C / min; pressurization is performed to 10 to 40MPa; heat insulation is performed for 10 to 120min; then, the temperature is lowered to the room temperature; a high-purity compact MoAlB block body material is obtained.

Description

technical field [0001] The invention belongs to the field of preparation of ceramic materials, in particular to a method for synthesizing MoAlB ceramic powder and dense blocks. Background technique [0002] Nano-layered ternary transition metal borides, also known as "MAB" phase, where M is a transition metal element, A is aluminum or zinc, and B is boron. Mainly includes Cr 4 AlB 6 , Cr 3 AlB 4 , Fe 2 AlB 2 , Cr 2 AlB 2 , Mn 2 AlB 2 , Ru 2 ZnB 2 , MoAlB, WAlB and other compounds (Document 1, Inorg.Chem.54(2015)6122; Document 2, J.Solid State Chem.224(2015)52.). In the MAB material family, MoAlB materials have excellent properties such as good electrical conductivity, thermal conductivity, high damage tolerance, and easy processing; especially MoAlB has excellent high-temperature oxidation resistance, and is the preferred material for high-temperature key components. [0003] At present, there are few methods for synthesizing MoAlB ceramic materials, and the pur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/626
CPCC04B35/58064C04B35/62605C04B2235/3804C04B2235/6562C04B2235/6567
Inventor 李世波刘杰胡树郡周洋李翠伟黄振莺翟洪祥
Owner BEIJING JIAOTONG UNIV
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