Iron composite cooker and surface processing method for same

A processing method and technology for cooking utensils, which are applied in metal material coating technology, special materials for cooking utensils, coatings, etc., can solve the problems of iron supplementation, peeling off, poor heat conduction, etc., to improve anti-pollution ability, improve Anti-rust performance, uniform color effect

Active Publication Date: 2016-11-09
湖北荣太炊具有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Iron cookware has the advantages of iron supplementation and is loved by users, but it has disadvantages such as easy to rust, poor heat conduction, and heavy weight
In order to solve the problem of heat conduction, a stainless steel-aluminum-stainless steel three-layer composite material appeared on the market. The cookware obtained from this process can solve the problems of rust and poor heat conduction, but the cookware is not iron cookware and cannot realize the function of iron supplementation
[0004] At present, there is no iron cookware processed by iron-aluminum-iron three-layer composite material on the market, because the iron located in the outermost layer and the innermost layer is easy to rust, and the iron-aluminum-iron three-layer composite material is processed into Iron cookware must be treated on its surface. If ordinary nitriding process is used, the treatment temperature should be above 530°C
However, the existing iron-aluminum-iron three-layer composite materials are processed by friction welding. When the processing temperature is higher than 500°C, cracks or peeling off will occur between adjacent layers. -Iron cookware obtained by processing iron three-layer composite material

Method used

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  • Iron composite cooker and surface processing method for same
  • Iron composite cooker and surface processing method for same

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Experimental program
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Effect test

Embodiment 1

[0026] The cooking utensils made of iron-aluminum-iron three-layer composite material are first degreased and polished mechanically, and then placed in a plasma oxynitridation furnace with multiple auxiliary heat sources. The surface processing methods are as follows:

[0027] a) First raise the temperature of the workpiece surface to 350°C at normal temperature, and stay for 10-30 minutes; then start adding gas when the temperature rises to 400°C and continue to heat up. Nitriding treatment is carried out in an atmosphere of 4-9:1, the time is 5-6 hours, and a nitrided layer with N-C-Fe compound is formed on the surface of the substrate, and the thickness of the nitrided layer is controlled at 10-50 microns; b) further Control the temperature at 430-490°C, and carry out nitrocarburizing in an atmosphere with a volume ratio of nitrogen:hydrogen:carbon monoxide:oxygen of 4-9:1:0.1-0.3:0.05-0.1 for 1-4 hours , form an oxynitride layer with N-C-O-Fe compound on the surface of the...

Embodiment 2

[0034] For cookware made of iron-aluminum-iron three-layer composite material, the inner iron layer is used to wrap the cookware base first, so that the surface of the product is all iron materials, and the surface is degreased and polished mechanically, and then It is placed in a plasma oxynitridation furnace with multiple auxiliary heat sources, and its surface is processed as follows:

[0035]First raise the surface temperature of the workpiece to 350°C at room temperature and stay for 10-30 minutes; then start adding gas when the temperature rises to 400°C and continue to heat up. In the temperature range of 450-480°C, the volume ratio of nitrogen:hydrogen is Nitriding treatment is carried out in an atmosphere of -9:1, and the time is 5-6 hours to form a nitrided layer with N-C-Fe compound on the surface of the substrate, and the thickness of the nitrided layer is controlled at 10-50 microns; b) further increase the temperature Controlled at 430-490°C, carry out nitrocarbu...

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Abstract

The present invention discloses an iron composite cooker and a surface processing method for the same. An existing iron-aluminum-iron three-layer composite is machined by means of friction welding; when a treatment temperature is above 500 DEG C, adjacent layers will split or peel; therefore, so far, no any iron cooker manufactured by using the iron-aluminum-iron three-layer composite is developed. In the present invention, a cooker base body made from the iron-aluminum-iron three-layer composite is placed in a plasma oxynitridation furnace with a plurality of auxiliary heat sources; nitriding or / and oxynitrocarburizing treatment is / are carried out to the surface of the base body at a temperature ranging from 400 to 500 DEG C to eventually form nitride layers containing at least N-C-Fe compounds or / and oxynitride layers containing at least N-C-O-Fe compounds. The surface processing method for the iron composite cooker is capable of avoiding the adjacent layers of the iron-aluminum-iron base material from splitting or peeling; the processed nitride layers or oxynitride layers can function in effective rust protection.

Description

technical field [0001] The invention belongs to the field of household cooking utensils, in particular to an iron composite cooker and a surface processing method thereof. Background technique [0002] In order to prevent rust, the current iron cookware, in addition to the oil-spray coating, is most commonly used to nitride or oxidize the surface of the iron cookware, that is, the so-called uncoated stainless / rust-proof iron pan, the treated substrate For single-layer steel or single-layer cast iron, liquid nitriding (or gas nitriding, plasma nitriding) is usually used, or a high-temperature liquid oxidation process is applied. Whether it is liquid nitriding or gas nitriding, the processing temperature is 530 ° C above. [0003] Iron cookware has the advantage of iron supplementation and is loved by users, but it has disadvantages such as easy to rust, poor heat conduction, and heavy weight. In order to solve the problem of heat conduction, a stainless steel-aluminum-stain...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/34C23C8/38A47J36/02
CPCA47J36/02C23C8/34C23C8/38
Inventor 刘莉
Owner 湖北荣太炊具有限公司
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