Method for preparing Cr2AlC by molten salt process

A molten salt method and powder technology, which is applied in the field of non-oxygen ceramic powder preparation, can solve irrelevant Cr2AlC powder research reports and other problems, and achieve the effect of simple and easy preparation process, environmental protection and good powder activity

Inactive Publication Date: 2006-12-27
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main preparation methods are vacuum pressureless sintering Songlan Yang, ZhenMing Sun, Hitoshi Hashimoto, Toshihiko Abe, Synthesis of single-phase Ti3SiC2, Journal of European Ceramic Society, 23(2003) 3147-3152, solid-liquid reaction process Y. Zhang, Y.C.Zhou, Y.Y.Li, Solid-liquid synthesis of Ti3SiC2 particulate by fluctuation procedure, Scripta Materialia, 49 (2003) 249-253 and fluctuation method Zhimei Sun, Yanchun Zhou, Fluctuation synthesis and characterization of Ti3SiC2 powders, Mat 9 Res Innovat)2(1 : 227-231, however, so far, there is no research report on the preparation of Cr2AlC powder at home and abroad

Method used

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  • Method for preparing Cr2AlC by molten salt process
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  • Method for preparing Cr2AlC by molten salt process

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Experimental program
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Embodiment 1

[0023] Chromium powder (5μm, 99.95%), aluminum powder (3μm, 99.95%) and carbon powder (5μm, 99%) are used as raw materials. The powder is in accordance with Cr 2The stoichiometric ratio of AlC and an excess of 10at% of aluminum powder; NaCl and KCl are weighed at a weight ratio of 1:1; the raw materials and salt are mixed at a weight ratio of 1:1, using absolute ethanol as the solvent, Use Si 3 N 4 After ball milling, the obtained slurry is dried to obtain a uniformly mixed powder. Put the mixed raw materials in Al 2 O 3 In the crucible, put the crucible into the graphite furnace, and then pass the flowing Ar as the protective atmosphere, heat up to 900°C at a heating rate of 10°C / min, keep it for 1 hour, and finally cool it down at 5°C / min. After the powder is cooled, take it out, wash with deionized water to remove the salt, until the AgNO3 solution is titrated without precipitation, dry to obtain Cr 2 AlC powder. XRD patterns such as figure 1 As shown, Cr in the powder 2 The w...

Embodiment 2

[0025] Chromium powder (5μm, 99.95%), aluminum powder (3μm, 99.95%) and carbon powder (5μm, 99%) are used as raw materials. The powder according to Cr 2 The stoichiometric ratio of AlC, and an excess of 5at% of aluminum powder; NaCl and KCl are weighed at a weight ratio of 1:1; the raw materials and salt are mixed at a weight ratio of 1:1, with absolute ethanol as the solvent, Use Al 2 O 3 Or Si 3 N 4 After ball milling, the obtained slurry is dried to obtain a uniformly mixed powder. Put the mixed raw materials in Al 2 O 3 In the crucible, put the crucible in the graphite furnace, then pass the flowing Ar as the protective atmosphere, heat up to 1000°C at a heating rate of 35°C / min, keep it for 3hr, and finally cool it down at 60°C / min. After the powder is cooled, take it out, wash with deionized water to remove the salt, until the AgNO3 solution is titrated without precipitation, dry to obtain Cr 2 AlC powder. XRD patterns such as figure 2 As shown, Cr in the powder 2 The weigh...

Embodiment 3

[0027] Chromium powder (5μm, 99.95%), aluminum powder (3μm, 99.95%) and carbon powder (5μm, 99%) are used as raw materials. The powder according to Cr 2 The stoichiometric ratio of AlC and an excess of 10at% of aluminum powder; NaCl and KCl are weighed at a weight ratio of 1:1; the raw materials and salt are mixed at a weight ratio of 1:1, using absolute ethanol as the solvent, Use Si 3 N 4 After ball milling, the obtained slurry is dried to obtain a uniformly mixed powder. Put the mixed raw materials in Al 2 O 3 In the crucible, put the crucible into the graphite furnace, and then pass the flowing Ar as the protective atmosphere, heat up to 1000°C at a heating rate of 35°C / min, keep it for 1 hour, and finally cool it at 60°C / min. After the powder is cooled, take it out, wash with deionized water to remove the salt, until the AgNO3 solution is titrated without precipitation, dry to obtain Cr 2 AlC powder. XRD patterns such as image 3 As shown, Cr in the powder 2 The weight percen...

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Abstract

The invention discloses a preparing method of Cr2AlC powder through molten salt method, which comprises the following steps: (1) adopting chromium powder, aluminum powder and graphite as raw material; allocating materials according to Cr2AlC chemical gauge with surplus aluminum; (2) heating to 900-1200 deg.c at 10-40 deg.c per min protected by Ar gas; insulating; cooling to prepare Cr2AlC powder. The invention can provide high-purity powder, which is fit for examining study and industrial manufacturing.

Description

Technical field [0001] The invention relates to a method for preparing high-purity aluminum carbon dichromium (Cr 2 AlC) powder method, more precisely, using chromium powder, aluminum powder and graphite as raw materials, through the molten salt method to prepare Cr 2 The weight percentage of AlC phase is greater than 90% of the powder. It belongs to the field of preparation of non-oxygen ceramic powder. Background technique [0002] M n+1 AX n Series (M is a transition metal element, A is a IIIA or IVA element, X is a C or N) is a kind of promising structural and functional integration materials, because they have the plasticity, electrical conductivity, heat conduction and potential of metals. Processability, while having the high strength, low density and excellent high temperature resistance and oxidation resistance of ceramics. [0003] Nowotny and its collaborators reported on it as early as the 1970s (H. Nowotny, "Struktuchemie Einiger Verbindungen der Ubergangsmetalle mit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/30C04B35/56C04B35/626
Inventor 田无边王佩玲张国军阚艳梅
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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