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Method for preparing aluminium-carbon-dichromium block material

A block material, aluminum carbon dichromium technology, applied in the field of preparation of aluminum carbon dichromium bulk materials, can solve problems such as few reports

Inactive Publication Date: 2008-10-29
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Regrettably, so far, domestic and foreign research on Cr 2 There are few reports on the preparation of AlC bulk materials

Method used

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  • Method for preparing aluminium-carbon-dichromium block material
  • Method for preparing aluminium-carbon-dichromium block material
  • Method for preparing aluminium-carbon-dichromium block material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The raw materials are chromium powder (30μm, 99.95%), aluminum powder (100μm, 99.95%) and carbon powder (1.5μm, 99%). Weigh according to the molar ratio of Cr:Al:C=2:1.1:1, and ball mill for 24 hours, and the obtained slurry is dried to obtain uniformly mixed powder. The powder was pressed into a disc, placed in a graphite mold coated with BN, first vacuumed, and then flowed with Ar protection gas, and hot-pressed at 1400 ° C for 2 hours at a pressure of 25 MPa. After the sample is cooled and taken out, it is processed by a grinding machine and a polishing machine to obtain Cr 2 AlC blocks. The XRD of the material is shown in Figure (1), and the Cr2AlC phase content is 94wt%. The bulk density is 5.20g / cm 3 .

Embodiment 2

[0024] The raw materials are chromium powder (30μm, 99.95%), aluminum powder (100μm, 99.95%) and carbon powder (1.5μm, 99%). Weigh according to the molar ratio of Cr:Al:C=2:1.2:1, and ball mill for 24 hours. After the obtained slurry is dried, a uniformly mixed powder is obtained. The powder is pressed into a disc and placed on the surface to coat BN In the graphite mould, vacuumize first, then flow Ar protective gas, and press at 1450°C for 1 hour at a pressure of 20MPa. After the sample is cooled and taken out, it is processed by a grinding machine and a polishing machine to obtain Cr 2 AlC blocks. The XRD of the material is shown in Figure (2), Cr 2 The AlC phase content is 99wt%. The bulk density is 5.12g / cm 3 .

Embodiment 3

[0026]The raw materials are chromium powder (30μm, 99.95%), aluminum powder (100μm, 99.95%) and carbon powder (1.5μm, 99%). Weigh according to the molar ratio of Cr:Al:C=2:1.4:1, and ball mill for 24 hours, and the obtained slurry is dried to obtain uniformly mixed powder. Press the powder into a disc, place it in a graphite mold coated with BN, first evacuate it, then pass it into a flowing Ar protective gas, and heat press at 1350 °C with a pressure of 20 MPa for 1 hour. After the sample is cooled and taken out, it is processed by a grinding machine and a polishing machine to obtain Cr 2 AlC blocks. The XRD of the material is shown in Figure (3), Cr 2 The AlC phase content is 99wt%. The bulk density is 5.09g / cm 3 .

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Abstract

This invention relates to a preparation method for Cr2AlC blocks with greater than 90% of the weight percentage of Cr2AlC phase characterizing in applying Cr power, Al powder and graphite as the raw material to match them in terns of a chemical measurement ratio, in which, Al is over volume 5-60wt%, 2, preparing Cr2AlC block material with a hot-pressure reaction sinter method, in 10-50deg.C / min warm-up rate, under 1250-1500deg.C and 20-30mpa pressure in the protection atmosphere.

Description

technical field [0001] The present invention relates to a kind of aluminum carbon dichromium (Cr 2 The preparation method of AlC) bulk material, more precisely adopts chromium powder, aluminum powder and graphite as raw material, by hot pressing reaction sintering method, prepares Cr 2 The weight percent content of the AlC phase is greater than 90% of the bulk material. The invention belongs to the field of block material preparation of non-oxygen ceramics. Background technique [0002] It is well known that the inherent brittleness of ceramic materials limits its application, and the low strength of metal materials at high temperatures (>1000°C) limits their use at high temperatures. Ceramic-based or metal-based composite phase materials are trying to overcome their respective shortcomings through the complementary properties of metal and ceramics. However, from the perspective of preparation technology, the preparation of such composite phase materials is naturally mo...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C45/00B22F3/16B22F9/04
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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