Method for processing fast powder sherardizing surface coat

A technology of powder galvanizing and surface coating, which is applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve the problem of difficult metal material heat treatment, no zinc/aluminum co-infiltration surface alloy layer, patent Application refusal and other problems to achieve the effect of fast heating speed, high utilization rate of heat source, and energy saving

Inactive Publication Date: 2008-02-13
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 3. In 1995, Jiangsu Li Xianyang applied for "a metal vacuum solid-state zinc-seeding agent and its zinc-seeding process (CN1115792)". This patent was published at the time of application, but the final patent application was rejected and failed;
Because all metal materials reflect microwaves or cause plasma formation, the traditional concept is that microwave energy is difficult to apply to the heating treatment of metal materials
However, there is no public research report on powder galvanizing and zinc / aluminum co-infiltration surface alloy layer using microwave heating.

Method used

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  • Method for processing fast powder sherardizing surface coat

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034]In a crucible made of heat-resistant ceramics is placed a 325 mesh volume ratio (the following ratios are volume ratios) of 30% zinc powder, 200 mesh 30% alumina powder and 100 mesh 40% quartz sand mixed uniformly. The buried surface has a small amount of rusty metal gaskets. Place the crucible on the turntable in the 800W microwave heating furnace and heat it under normal pressure. The heating time is 15 minutes, and then it is cooled in air. The surface of the metal gasket can be A zinc-iron alloy infiltrated layer with an average thickness of 39.3 microns was obtained. Figures 1 and 2 are the metallographic photos of the zinc-iron alloy infiltration layer quickly prepared on the surface of the metal gasket by microwave heating. They respectively show the distribution of the zinc-iron alloy infiltration layer at the corners and planes of the metal gasket. It can be seen that regardless of the corners A layer of uniform thickness can be obtained anywhere or on a plane.

Embodiment 2

[0036] Place 200 mesh 30% zinc powder, 325 mesh 10% aluminum powder, 1% ammonium chloride powder, and the rest 120 mesh quartz sand filler in the alumina crucible, mix the sherardizer, and remove the oil and rust metal gasket It is embedded in the sherardizer, the crucible is sealed with water glass or refractory cement and then placed in an 800W microwave oven for heating for 20 minutes. A zinc-aluminum-iron alloy layer with an average thickness of 50 microns can be obtained on the surface of the metal gasket.

Embodiment 3

[0038] In the alumina crucible are placed 200 mesh 10% zinc powder, 325 mesh 30% aluminum powder and 3% ammonium chloride powder, and the rest is 200 mesh alumina (Al 2 O 3 ) Mixing the filler uniformly with the sherardizer, embed the pre-treated metal gasket in the sherardizer, seal the crucible and place it in a 800W microwave oven for 30 minutes to heat and keep it warm. Aluminum-zinc can be obtained on the surface of the metal gasket. Ferroalloy infiltration layer.

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Abstract

The invention relates to a method of processing a fast powder sherardizing surface coating. A metal component is embedded in a metal powder sherardizing agent ceramic sherardizing can containing zinc powder or zinc / aluminum composite powder, put into a microwave heating furnace for microwave heat treatment when slowing rolling, cooled after temperature preserving, and taken out for post treatment. In the zinc / aluminum composite metal powder, the volume fraction of the aluminum powder is less than or equal to 40percent, and the rest is zinc powder. Composition of the metal powder sherardizing agent: the volume percent of the zinc powder or zinc / aluminum composite powder is 10 to 40percent; the volume percent of activating agent is 0 to 3percent; and the rest is SiO2 or AL2O3 filling agent. The filled ceramic sherardizing can is put into the microwave heating furnace for heat treatment. The invention uses microwave to obviously shortens the heating time, which is only 1 / 5 to 1 / 8 of that of traditional sherardizing technologies, saves more than 50 percent energy, greatly improves the production efficiency of the powder sherardizing processing, and reduces the manufacturing cost.

Description

Technical field [0001] The invention relates to the technical field of metal surface modification or alloying treatment, in particular to a rapid powder sherardizing surface coating processing method. Background technique [0002] The powder sherardizing process utilizes the infiltration and diffusion of metal atoms in the heated state to infiltrate the zinc element into the surface of the steel component under the condition of no phase change in the metal matrix to form an alloy protective layer with different Zn-Fe ratios. The main purpose of powder sherardizing surface alloy coating is to improve and enhance the corrosion resistance, surface oxidation resistance and wear resistance of the metal workpiece surface. [0003] The principle of traditional powder sherardizing was first proposed by British metallurgist Sherard Cowper-Coles in 1904. The general process can be found in many documents or manuals, such as (Su) Liahovich, Sun Yitang, etc. Translated: "Metal Handbook of Ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C10/34
Inventor 杨新岐秦红珊
Owner TIANJIN UNIV
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