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Method for preparing nano-ceramet-base metal ceramic

A technology of nano-cermets and cermets, which is applied in the coating process and coating of metal materials, can solve the problems of reduced toughness and toughness of cemented carbide, and achieve the effect of superior wear resistance

Active Publication Date: 2008-02-20
芜湖舍达激光科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as the WC particle size decreases from micron to nanoscale, the toughness of cemented carbide decreases continuously.
[0005] In short, the strength and hardness of cermets are strengthened with the composition of strengthening phase composition, content and particle size adjustment, while the toughness will be greatly reduced, that is to say, there is a contradiction between the strengthening and toughening of cermets

Method used

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  • Method for preparing nano-ceramet-base metal ceramic
  • Method for preparing nano-ceramet-base metal ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] For the cermet material composed of WC and Co, nano-WC-Co-based WC-(nano-WC-Co) spray powder was used, and the CS-2000 cold spray system was used to prepare the coating, with helium as the accelerating gas. The WC-(nano-WC-Co) coating was prepared by deposition on the surface of the substrate. The analysis results of the microstructure of the coating (as shown in Figure 2) show that some larger particles of WC ceramic phases are distributed in the nano-WC-Co matrix of the coating. Hardness analysis shows that the average hardness of the coating exceeds 1800Hv in the sprayed state, which is close to the hardness of the nanostructured WC-Co alloy bulk material with the same composition. During the cold spraying process, the powder particle deformation process causes severe deformation in the area near the interface between the powders. The metal Co in this area forms a fine-grained metastable structure with high-density defects due to the severe deformation. Due to the ge...

Embodiment 2

[0033] For the cermet material composed of WC and Co, the traditional micron-structured WC-12Co cemented carbide powder was selected as the raw material. The typical initial particle size of WC in the powder is 0.3 μm to 1 μm, and the planetary ball mill was used for 72 hours at room temperature to obtain Part of the WC phase in the powder becomes nano-scale WC small particles due to ball milling, while the other part remains sub-micron. After sieving, 300-500-mesh spray powder is obtained, and the coating is prepared by a cold spray system. In order to accelerate the gas, the WC-(nano-WC-Co) coating was prepared by depositing on the surface of the substrate. The analysis results of the microstructure of the coating (as shown in Figures 4 and 5) show that some larger particles of WC ceramic phases are distributed in the nano-WC-Co matrix of the coating. . Hardness analysis shows that the average hardness of the coating is 1715Hv in the as-sprayed state, which is close to the ...

Embodiment 3

[0035] For cBN, Cr 3 C 2, NiCrAl composed of cermet materials, select nano-scale cBN, micron-scale Cr 3 C 2 Mix with NiCrAl alloy according to the volume ratio of 20:40:40 and then ball mill to obtain composite powder, which is sieved to obtain 600-400-mesh composite powder, and the coating is prepared by cold spraying system, using nitrogen as the accelerating gas, on the aluminum substrate Thick coatings are prepared by surface deposition, and the aluminum substrate is removed by alkaline solution to obtain cBN-Cr 3 C 2 -NiCrAl bulk material, after 800℃ diffusion treatment for 2h, get nano-cBN-nano-Cr 3 C 2 -NiCrAl-based large-grained Cr 3 C 2 Reinforced high-strength and high-toughness cermets.

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Abstract

The invention discloses a method for preparing high strength, high tenacity and super hard metallic porcelain with Nami metallic ceramic matrix. The method comprises the steps as follow: adopt cold spraying method and take high voltage helium gas as the acceleration gas; spray the metallic porcelain powder which takes the Nami metallic ceramic as the matrix or the metallic porcelain powder containing components which can produce Nami porcelain precipitated phase into sediment to prepare metallic porcelain with metastable structure; the interface between the porcelain phase of the metallic porcelain and the metal phase, the metal phase and the metal phase and the spraying powder deformation particle in the metastable structure produces diffusion and interface reaction to gain high strength, high tenacity and super hard metallic porcelain with Nami metallic ceramic matrix. As the metallic porcelain takes the normal micron and submicron porcelain phase as the hardening and reinforcing phase; and takes the high strength and supper hard metallic porcelain as the matrix, the invention not only has the characters of high strength and supper hard of the metallic porcelain material, but also has the characters of high tenacity and better wear-proof property. The invention is a new method for preparing high strength, high tenacity and high wear-proof property metallic porcelain coating.

Description

technical field [0001] The invention belongs to the field of material engineering and technology, and relates to a method for preparing nano-cermet-based cermets with high strength, high toughness and high wear resistance. The method can prepare coatings and block materials. Background technique [0002] Among the failed mechanical parts, the failure caused by abrasive wear accounts for about 40%. Therefore, continuously improving the wear resistance of materials through surface strengthening and toughening of metal materials is an important method to improve product quality and life. extensive attention. According to the current understanding, increasing the hardness can effectively improve the wear resistance. The cermet composite material composed of a hard ceramic phase and a metal matrix with good plasticity and toughness not only has the high hardness and wear resistance of ceramic materials, but also has a certain toughness. It is a commonly used wear-resistant mater...

Claims

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Application Information

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IPC IPC(8): C22C1/04C22C1/10C23C24/00C22C29/00
Inventor 李长久杨冠军李成新
Owner 芜湖舍达激光科技有限公司
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