Process for preparing anti-bacteria stainless steel by double-layer glowing method

Abstract

The invention relates to an antibiosis stainless steel manufacturing method used double layers glowing metallic cementation process. The stainless steel base material is put into double layers glowing metallic cementation furnace to cement antibiosis element. Its working conditions are as follows: gas pressure in the furnace is 1.33-133Pa; source-electrode voltage is 0.7-1.4KV; work piece voltage is 0.6-1.2KV; temperature is 800-1050 centigrade degree; interelectrode distance is 10-20mm; cementation time is 2-4h; antibiosis element is Cu or Ag; the time of vacuum aging treatment after Cu cementation is 1-10h; and temperature is 450-900 centigrade degree. The production technology is simple, and holds base material inherent corrosion resistance. The stainless steel surface has diffused layer containing copper or silver phase. Thus its surface has good germ resistance.

Description

1. Technical field [0001] The invention relates to a method for preparing antibacterial stainless steel. In particular, it relates to a method for preparing antibacterial stainless steel by a double-layer glow infiltration method. 2. Technical background [0002] At present, stainless steel is widely used in many fields, such as sanitary ware, kitchen utensils and tableware used in daily life, which not only require its brightness and beauty, but also require antibacterial and sterilizing properties, so stainless steel with antibacterial properties has emerged as the times require. In recent years, a variety of antibacterial stainless steels with good antibacterial effects have been developed successively. For example, Japanese researchers have obtained a whole series of antibacterial stainless steels based on stainless steel, including NSS-AM series of antibacterial stainless steels with Cu added, SUS304, R430AB, R430LN- AB plus silver antibacterial stainless steel, SUS340...

AI Technical Summary

Problems solved by technology

[0007] The first two technologies add antibacterial metal ions Cu or Ag to the stainless steel as a whole through steelmaking, continuous casting and rolling processes. Due to the severe oxidation of Cu added in the smelting process, the yield is low, and at the same time, Cu is added to the stainless steel matrix as a whole. or Ag greatly increases the cost of steel

In addition, the hot brittleness of Cu will cause cracking in the rolling process, which requires high rolling process.

"Surface copper-containing antibacterial stainless steel and its manufacturing process" is a process for preparing antibacterial stainless steel by infiltrating copper on the surface, but when dealing with large pieces, the preparation, mixing and subsequent heat treatment of the infiltrating agent will increase the labor intensity. The method of preparing antibacterial stainless steel by ion implantation" The ion implantation equipment used is expensive, and it is difficult to handle special-shaped parts, and the scope of application is limited

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