A kind of preparation method of controllable multi-type chromium carbide modified graphite

A chromium carbide, multi-type technology, applied in metal material coating process, vacuum evaporation coating, coating and other directions, can solve the problems that restrict the performance of metal-based graphite self-lubricating composite materials, poor wettability between matrix and graphite, and graphite phase extraction. It can solve problems such as peeling and peeling, and achieve the effects of rich functionality and innovation, high production efficiency, and controllable types.

Active Publication Date: 2022-02-22
XI AN JIAOTONG UNIV +1
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Problems solved by technology

[0002] At present, graphite as a reinforcing phase and lubricating phase has been widely used in metal matrix composites and polymer matrix composites, but due to the poor wettability of the matrix and graphite, low interface bonding strength, poor internal gaps, and poor density, etc., The matrix and graphite are completely non-wetting, the interface is only mechanically bonded, and the bonding strength is low. When the material is loaded as a whole, it is easy to cause the pull-out and peeling of the graphite phase, which restricts the self-lubricating composite materials of metal-based graphite and polymer-based graphite. Improvement of properties of self-lubricating composite materials
The use of modified graphite can effectively improve the above problems, but due to process limitations, the manufacture of modified graphite with high performance and multiple functions is still an industrialization of metal-based graphite self-lubricating composite materials and polymer-based graphite self-lubricating composite materials. Bottleneck in preparation and its commercial application

Method used

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  • A kind of preparation method of controllable multi-type chromium carbide modified graphite
  • A kind of preparation method of controllable multi-type chromium carbide modified graphite
  • A kind of preparation method of controllable multi-type chromium carbide modified graphite

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preparation example Construction

[0029] The concrete steps of the preparation method of a kind of controllable multi-type chromium carbide modified graphite of the present invention are as follows:

[0030] S1. First use the NaOH solution with a concentration of 15-20wt.% to fully wash the graphite powder, then rinse the graphite powder to neutrality with distilled water, and then evaporate to dryness;

[0031] The temperature of evaporative drying is 80-100° C., and the time is 0.5-1.5 hours.

[0032] The graphite powder is a graphite powder with a particle diameter of 20-40 μm, a particle size of 325-625 mesh, and a purity of 97.5-99.5%, and the shape of the powder is not specifically limited.

[0033] S2, laying the dried graphite powder evenly on the sample stage;

[0034] The thickness of the powder tile is 0.5 ~ 1mm, and the laying area is not more than 30cm 2 .

[0035] S3, performing multi-arc ion plating modification treatment on the laid graphite powder;

[0036] Multi-arc ion plating modificati...

Embodiment 1

[0044] Diffused H-Cr 7 C 3 Nanoparticles Reinforced Pure Chromium Modified Flake Graphite

[0045] 1) First, fully wash flake graphite powder with a particle size of 40 μm, a particle size of 325 mesh, and a purity of 97.5% with a NaOH solution of a concentration of 15 wt.%. Rinse the flake graphite powder with distilled water to neutrality, and then evaporate to dryness at a drying temperature of 80° C. and a drying time of 1.5 hours.

[0046] 2) Spread the dried flake graphite powder evenly on the sample stage, the thickness of the powder is 0.5mm, and the laying area is 20cm 2 .

[0047] 3) The flake graphite powder that has been laid is subjected to multi-arc ion plating modification treatment. The specific plating parameters are that the plating time is 3 minutes, the plating atmosphere is argon, and the atmosphere pressure is 2×10 -1 Pa, the plating temperature is 240°C, the duty cycle is 50%, the bias voltage is 20V, and the target material is a pure chromium targe...

Embodiment 2

[0051] Diffused Cr 3 C 2 Nanoparticle Reinforced H-Cr 7 C 3 modified graphene

[0052] 1) First, the graphene with a particle size of 20 μm, a particle size of 625 mesh, and a purity of 99% is fully washed with a NaOH solution of a concentration of 18 wt.%. Then the graphene was rinsed with distilled water to neutrality, and then evaporated to dryness at a drying temperature of 100° C. and a drying time of 0.5 hours.

[0053] 2) Place the dried graphene tiles evenly on the sample stage, the thickness of the powder tiles is 0.8mm, and the laying area is 25cm 2 .

[0054] 3) Perform multi-arc ion plating modification treatment on the laid graphene. The specific plating parameters are that the plating time is 1 minute, the plating atmosphere is argon, and the atmosphere pressure is 3×10 -1 Pa, the plating temperature is 260°C, the duty cycle is 70%, the bias voltage is 40V, and the target material is a pure chromium target.

[0055] 4) After the multi-arc ion plating and ...

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Abstract

The invention discloses a preparation method of controllable multi-type chromium carbide modified graphite. The graphite powder is pretreated, and then two plating and plating modification treatments are carried out through a multi-arc ion plating process; Different types of chromium carbide ceramics were plated on the graphite surface at a certain time, and the dispersed H-Cr was obtained by controlling the modification time of the secondary multi-arc ion plating 7 C 3 Nanoparticles reinforced pure chromium modified graphite, dispersed Cr 3 C 2 Nanoparticle Reinforced H‑Cr 7 C 3 Modified graphite or dispersed CrC nanoparticles reinforced Cr 3 C 2 modified graphite. The invention can freely control the required different components of the chromium carbide modified graphite. The chromium carbide coating on the graphite surface has uniform composition, no impurities, high purity, simple operation process, high production efficiency and large production volume.

Description

technical field [0001] The invention belongs to the technical field of graphite surface modification and powder metallurgy preparation, and in particular relates to a preparation method of controllable multi-type chromium carbide modified graphite. Background technique [0002] At present, graphite as a reinforcing phase and lubricating phase has been widely used in metal matrix composites and polymer matrix composites, but due to the poor wettability of the matrix and graphite, low interface bonding strength, poor internal gaps, and poor density, etc., The matrix and graphite are completely non-wetting, the interface is only mechanically bonded, and the bonding strength is low. When the material is loaded as a whole, it is easy to cause the pull-out and peeling of the graphite phase, which restricts the self-lubricating composite materials of metal-based graphite and polymer-based graphite. Improved performance of self-lubricating composites. The use of modified graphite c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C14/32C23C14/06C23C14/02
CPCC23C14/32C23C14/0635C23C14/021
Inventor 王怡然高义民李烨飞李博周长猛刘庆坤
Owner XI AN JIAOTONG UNIV
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