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Preparation method and device for industrial microwave heating diffusion coating

A microwave heating and diffusion coating technology, which is applied in the direction of solid-state diffusion coating, coating, metal material coating technology, etc., can solve the problems that industrial production and processing cannot be applied, continuous close contact cannot be guaranteed, and ceramic containers are difficult to manufacture. , to achieve the effect of promoting thermal diffusion metallurgical chemical reaction, accelerating thermal diffusion process, and shortening heat treatment

Inactive Publication Date: 2009-10-28
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, the above-mentioned microwave thermal diffusion process is only suitable for preparing thermal diffusion coatings in a laboratory environment, and cannot be applied to large-scale industrial production and processing.
Its key limitations are: (1) the powder infiltration agent itself is used as a microwave heating material (i.e. volume heat source), in order to obtain a sufficiently high temperature (heat) and produce a metallurgical diffusion chemical reaction, the powder infiltration agent embedded in the workpiece must have sufficient (2) adopt the static heating and heat preservation method (see CN1535325A) that metal workpieces are embedded in the powder infiltration agent, and freshness cannot be guaranteed during the heating process. The continuous close contact between the diffusion infiltration agent and the surface of the treated metal workpiece, in order to obtain a uniform infiltration layer must use an infiltration agent containing a high concentration of diffused metal elements (see CN1535325A), which will inevitably cause the cost of the powder infiltration agent to be significantly higher than the treated Metal workpiece, powder raw material consumption is serious; (3) adopting ceramic airtight container to carry out microwave heating treatment under continuous rolling is only suitable for processing small-sized, light-weight metal parts (seeing CN101122005A) in the laboratory, and powder infiltration in actual industrialized production Zinc airtight containers are more than 2 meters long and filled with metal workpieces that weigh hundreds of kilograms. Such large-sized, high-strength ceramic containers are difficult to manufacture
Therefore, it is difficult to realize industrial production by considering these processes in terms of economy and engineering application.

Method used

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  • Preparation method and device for industrial microwave heating diffusion coating
  • Preparation method and device for industrial microwave heating diffusion coating
  • Preparation method and device for industrial microwave heating diffusion coating

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Embodiment 1: After a small amount of 25# carbon steel metal gaskets processed before pickling are embedded in 325 mesh 60%wt zinc powder, 200 mesh 37%wt alumina powder and 3%wt ammonium chloride powder are mixed uniformly Infiltration agent, filled into a rolling sealed metal container, wrapped in quartz sand and placed in an insulating ceramic container to seal the cover, the volume of quartz sand is approximately 60% of the volume of the metal container, and then placed in a microwave oven at 0.5 Rolling and heating at rpm for 25 minutes, and then keeping it warm for 60 minutes, a zinc-iron alloy infiltrated layer with a thickness of 110-130 microns can be obtained on the surface of the metal gasket. image 3 and Figure 4 It is the metallographic photo of the zinc-iron alloy infiltrated layer obtained on the surface of the metal gasket.

Embodiment 2

[0039] Example 2: Embed high-strength bolts pretreated by pickling in 325 mesh 40%wt zinc powder, 10%wt aluminum powder, 300 mesh 48%wt alumina powder and 2%wt ammonium chloride powder Put it into the rolling metal container and embed it in the quartz sand. The volume of the quartz sand is approximately 70% of the volume of the metal container. Then place it in a microwave oven and heat it for 30 minutes under the rolling state of 1.5rpm. Control the temperature at 400°C. Then hold the temperature for 40 minutes, and finally cool in the air, and obtain a zinc-aluminum-iron composite coating with an average thickness of about 50-60 microns on the surface of the high-strength bolt.

Embodiment 3

[0040] Embodiment 3: Embed a small amount of 25# carbon steel gaskets treated before pickling in 300 mesh 30%wt zinc powder, 200 mesh 60%wt alumina powder and 3%wt ammonium chloride, 7%wt Put metal titanium oxide powder into the infiltration agent after uniform mixing, and put it into a rolling sealed metal container wrapped with microwave heating material mixed with quartz sand and silicon carbide (ratio 10:1). The volume of the mixed microwave heating material powder is approximately 80 % of the volume of the metal container, then placed in a microwave oven at 3.0rpm and heated for 40 minutes in a rolling state to control the temperature at 380 ° C, keep the temperature for 50 minutes and then cool in the air, the surface of the gasket can be obtained with an average thickness of 40-50 microns Zinc-iron alloy coating.

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Abstract

The invention relates to a preparation method and a device for an industrial microwave heating diffusion coating. The method uses microwave to directly heat a sealed metal container that is wrapped with absorptive microwave heating material and constantly rolls, and then to indirectly to heat filled powder seeping agent and embedded metal workpieces in the container, and prepares a heat diffusion coating on the surface of the metal workpieces under the mutual and comprehensive action of microwave heat energy, mechanical friction impact medium and seeping agent. Microwave heating material crucially functions as a volumetric source to directly heat the sealed metal container rolling constantly, and can effectively isolate the interaction of the microwave and the metal container to prevent the metal container from reflecting the microwave and causing an arc phenomenon. The method can complete the processes of sherardizing (Zn), aluminizing (Al), zinc / aluminum (Zn / Al) common impregnation and boriding (B), and can be promoted and applied to other powder embedding technologies, effectively shorten chemical treatment and hot treatment time and reduce hot treatment temperature.

Description

technical field [0001] The invention relates to the technical field of metal material surface modification or alloying treatment, in particular to an industrialized microwave heating diffusion coating preparation method and device. Background technique [0002] Solid multi-component surface alloying treatment is a kind of powder embedding chemical heat treatment process that uses the diffusion and penetration of metal atoms under heating to diffuse one or more metal elements into the surface of metal materials to form an alloy protective layer, published in 2008 The US ASTM-A1059 / A1059M-08: "Standard Specification for Zinc Alloy Thermo-Diffusion Coatings on Steel Fasteners, Hardware, and Other Products" standard refers to the protective layer formed by this process as a thermal diffusion coating (Thermo-Diffusion Coatings- TDC). The thermal diffusion coating treatment process can significantly improve the performance of metal materials such as corrosion resistance, wear res...

Claims

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Application Information

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IPC IPC(8): C23C10/34C23C8/60C23C10/48C23C10/36C23C10/52C23C8/68
Inventor 杨新岐秦红珊
Owner TIANJIN UNIV
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