Preparation method of nano-Cr3C2 powder and application of nano-Cr3C2 powder to multi-element alloy coating

A multi-element alloy and nanotechnology, applied in the field of alloy materials, can solve the problems of poor thermal shock resistance of roll coating materials, and achieve the effect of preventing uneven reaction, uniform particle size and small volume change

Inactive Publication Date: 2017-09-19
马鞍山华之智信息科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems in the prior art that the bonding strength of the multi-element alloy coating and the uniformity of the coating surface composition are not good enough to cause

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The nano-Cr of this embodiment 3 C 2 Powder preparation method:

[0034] Step 1: Mixing: put ammonium dichromate powder and nano carbon black powder in distilled water with a weight ratio of 1:0.16, mix and stir evenly to form a fluid state, and add it to a square mold Compression molding is a precursor; after compression, it is block-shaped, and pressed to a thickness of 1cm to facilitate quick freezing;

[0035] Step 2: Quick freezing: Quickly transfer the precursor into a -100°C quick freezing space for quick freezing for 60 minutes; the purpose of quick freezing is to freeze the fluid in the shortest possible time, ammonium dichromate powder and nano-carbon black The powder is quickly positioned after stirring evenly to prevent the block fluid from stratifying due to the difference in density, resulting in uneven distribution of chromium source and carbon source after subsequent freeze-drying treatment;

[0036] Step 3: Freeze-drying: Quickly transfer the frozen ...

Embodiment 2

[0047] The nanometer Cr of present embodiment C The preparation method of powder:

[0048] Step 1: Mixing: put ammonium dichromate powder and nano carbon black powder in distilled water with a weight ratio of 1:0.22, mix and stir evenly to form a fluid state, and add it to a square mold Compression molding is a precursor; after pressing with a pressure of 2Mpa, it becomes a block, and it is pressed to a thickness of 3cm, so as to facilitate quick freezing;

[0049] Step 2: Quick-freezing: Quickly transfer the precursor into a -80°C quick-freezing space for 120 minutes;

[0050] Step 3: Freeze-drying: Quickly transfer the frozen precursor into a vacuum freeze-drying chamber for freeze-drying. The freeze-drying process curve is:

[0051] A. Initial stage: plate temperature is 0°C to 100°C, temperature rise slope is 2°C / min, 100°C is maintained for 30 minutes, and the vacuum is pumped to within 60Pa;

[0052] B. Mid-term: the plate temperature is lowered to 80°C / min, and kept f...

Embodiment 3

[0068] The nano-Cr of this embodiment 3 C 2 The preparation method of powder is:

[0069] Step 1: Mixing: put ammonium dichromate powder and nano-carbon black powder in distilled water with a weight ratio of 1:0.19, mix and stir evenly to form a fluid state, and add it to a square mold Compression molding is a precursor; after pressing with a pressure of 1.2Mpa, it becomes a block, and the thickness is 2cm, so as to facilitate quick freezing;

[0070] Step 2: Quick freezing: Quickly transfer the precursor into a -90°C quick freezing space for quick freezing for 80 minutes;

[0071] Step 3: Freeze-drying: Quickly transfer the frozen precursor into a vacuum freeze-drying chamber for freeze-drying. The freeze-drying process curve is:

[0072] A. Initial stage: plate temperature 0℃~100℃, heating slope 2℃ / min, keep at 100℃ for 40 minutes, vacuum to within 60Pa;

[0073] B. Mid-term: the plate temperature is lowered to 85°C / min, and kept for 50 minutes, and the vacuum is contro...

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Abstract

The invention discloses a preparation method of nano-Cr3C2 powder and application of the nano-Cr3C2 powder to a multi-element alloy coating and belongs to the technical field of alloy materials. The preparation method of the nano-Cr3C2 powder, disclosed by the invention, comprises the following four steps: 1, mixing: putting ammonium dichromate powder and nano-carbon black powder into distilled water or de-ionized water; mixing and uniformly stirring until fluid is formed; adding the fluid into a mold and pressing and molding to form a precursor; 2, quickly freezing: rapidly transferring the precursor into a quick-freezing space for quickly freezing; 3, carrying out freeze-drying: rapidly transferring the quickly-frozen precursor into a vacuum freezing and drying cabin and carrying out the freeze-drying; 4, carbonizing: closing a cold trap of the vacuum freezing and drying cabin and gradually reducing high-valence oxide of chromium to low-valence oxide of chromium through carbon along with the rising of temperature, so as to prepare the multi-element alloy coating. The prepared multi-element alloy coating has the characteristics that the aims of heat-resisting and wear-resisting properties and high bonding strength are realized.

Description

technical field [0001] The invention relates to the technical field of alloy materials, in particular to a nano-Cr 3 C 2 Preparation method of powder and its application in multi-component alloy coating. Background technique [0002] Chromium carbide has a high melting point, hardness and high-temperature strength, and is widely used in metallurgy, electronics, catalysts and high-temperature coating materials. Among them, chromium carbide plays an important role in the fields of cemented carbide and cermet as a grain inhibitor. What is needed in industrial applications is chromium carbide powder with fine particle size and single phase composition. For example, when preparing ultra-fine cemented carbide, the particle size of WC powder should be less than 200nm. Add chromium carbide grain growth inhibitor. If chromium carbide with a powder particle size of 2-5 μm is used as a grain growth inhibitor, it will be difficult to inhibit the grain growth of WC due to the small s...

Claims

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Application Information

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IPC IPC(8): C01B32/914B82Y40/00C04B35/56C04B35/622
Inventor 候衍荣闫谨
Owner 马鞍山华之智信息科技有限公司
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