Cr2AlC ceramic target and preparation method thereof by vacuum hot pressing

A chrome-aluminum-carbon ceramic and vacuum hot pressing technology is applied in the fields of chrome-aluminum-carbon ceramic targets and their vacuum hot-pressing preparation and high-temperature coating target preparation. Serious lumps, environmental pollution and other problems, to achieve the effect of uniform heating, moderate grain size, and high single-phase content

Active Publication Date: 2013-10-23
有研资源环境技术研究院(北京)有限公司
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Problems solved by technology

[0005] Chinese invention patent (CN200610028833.4) discloses a method for preparing Cr by molten salt method 2 AlC powder method, but the prepared powder contains Cr 7 C 3 and Cr 2 Al and other impurity phases, and improper post-treatment of salt used in the preparation process will easily pollute the environment; Chinese invention patent (CN200810105008.9) discloses a pressureless sintering synthesis of Cr 2 The method of AlC ceramic powder, but considering that during the preparation process of pressureless sintering, aluminum will flow in a large amount at about 660 degrees, the loss is serious, and the prepared powder is seriously agglomerated, and the subsequent process of crushing into powder requires a lot of power consumption ,energy

Method used

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  • Cr2AlC ceramic target and preparation method thereof by vacuum hot pressing

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036]Weigh 104 grams of Cr powder, 32.4 grams of Al powder, and 12 grams of C powder. The purity of chromium powder, aluminum powder and carbon powder is greater than 99.9%, and the particle size is less than 20 μm. Put them into a ball mill jar and add 300 grams of agate balls , ball milled for 12 hours. The raw material powder is put into the graphite mold, and the raw material is pre-pressed axially with a jack, and the pre-pressing pressure is 2MPa. After pre-pressing, the graphite mold is moved into the vacuum hot-pressing sintering furnace. The hot-press furnace is first evacuated to a certain degree of vacuum with a mechanical pump, and then evacuated to 10 with a Roots pump. -1 Pa, then raise the temperature to 630°C at a heating rate of 5°C / min, keep the temperature for 2 hours, without pressurization; then raise the temperature at a speed of 10°C / min, gradually increase the pressure, and raise the temperature to 1350°C, the pressure is 20MPa, keep the heat After pr...

Embodiment 2

[0039] Weigh 156 grams of Cr powder, 48 grams of Al powder, and 18 grams of C powder, put them into a ball mill jar, add 300 grams of agate balls, and ball mill for 13 hours. The raw material powder is put into the graphite mold, and the raw material is pre-pressed axially with a jack, and the pre-pressing pressure is 2MPa. After pre-pressing, the graphite mold is moved into the vacuum hot-pressing sintering furnace. The hot-press furnace is vacuumed successively with a mechanical pump and a Roots pump for 10 -1 Pa, then raise the temperature to 630°C at a heating rate of 5°C / min, and keep the temperature for 2 hours; then raise the temperature at a speed of 10°C / min, gradually increase the pressure, and raise the temperature to 1400°C, and the pressure is 20MPa, and keep the pressure for 2 hours. , turn off the heating power supply, and start to cool down. After the temperature reaches 1000°C, release the pressure and cool for 10 hours. The furnace temperature drops to room t...

Embodiment 3

[0041] Weigh 312 grams of Cr powder, 100 grams of Al powder, and 36 grams of C powder, put them into a ball mill jar, add 600 grams of agate balls, and mill for 15 hours. The raw material powder is put into the graphite mold, and the raw material is pre-pressed axially with a jack, and the pre-pressing pressure is 3MPa. After pre-pressing, the graphite mold is moved into the vacuum hot-pressing sintering furnace. The hot-press furnace is vacuumed successively with a mechanical pump and a Roots pump for 10 -1 Pa, then raise the temperature to 650°C at a heating rate of 5°C / min, and keep the temperature for 2 hours; then raise the temperature at a speed of 10°C / min, gradually increase the pressure, and raise the temperature to 1500°C, and the pressure is 30MPa, and keep the pressure for 2 hours. , turn off the heating power supply, and start to cool down. After the temperature reaches 1100 ° C, release the pressure, cool for 10 hours, and the furnace temperature drops to room te...

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Abstract

The invention relates to a Cr2AlC ceramic target and a preparation method thereof by vacuum hot pressing, which comprises the following steps: mixing chromium powder, aluminum powder and carbon powder in a mol ratio of 2:(1-1..5):1, and prepressing into a blank; vacuumizing a hot pressing furnace to 10<-1>Pa, heating to 600-650 DEG C at 5-10 DEG C/min, and keeping the temperature for 1-2 hours; heating to 1300-1500 DEG C at 10-20 DEG C/min, pressurizing to 10-30MPa, keeping the temperature and pressure for 2-4 hours, and cooling to 900-1100 DEG C, and relieving the pressure to normal pressure; cooling to room temperature to obtain the blank; and after machining and electromachining, cleaning, and drying to obtain the high-purity high-single-phase-content Cr2AlC ceramic target. The density of the prepared Cr2AlC ceramic target is up to higher than 97%, the Cr2AlC compound phase content is up to 98-99%, the oxygen content of the target is low, the target quality satisfies the coating preparation requirement, the cost is low, and thus, the invention is suitable for industrial production of large-size Cr2AlC ceramic targets.

Description

technical field [0001] The invention relates to a method for preparing a target for high-temperature coating, in particular to a chromium-aluminum-carbon ceramic target and a method for preparing the same by vacuum hot pressing, belonging to the technical field of ceramic target preparation. Background technique [0002] Ceramics is an indispensable material in human life and production, and its application range covers all fields of the national economy. As we all know, the chemical bonds of ceramic materials are generally ionic bonds and covalent bonds. This chemical bond has strong directionality and high binding energy. high. Ceramic materials are inherently brittle and generally difficult to produce plastic deformation, thus limiting their application fields. Although ceramic researchers have done a lot of work on ceramic toughening, these methods are generally costly and complicated. [0003] In recent years, a class of ternary carbides and nitrides with a layered s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/16C04B35/515C04B35/645
Inventor 储茂友王星明陈洋邓士斌韩沧张碧田段华英潘德明
Owner 有研资源环境技术研究院(北京)有限公司
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