JPS5818905A - Method of nitriding part of magnetic circuit formed of armco iron - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a narrow surface infiltration method, particularly for nitriding components of armco iron magnetic circuits.

The present invention can be advantageously used in nitriding parts of magnetic circuits used in tools, equipment, combinators, and also has applications in the production of magnetic screens @ Producing silicon steel with uniformly oriented grains The method is known (e.g. British Patent Specification No. 1261945)
. This method involves nitriding steel at a temperature of 450-750°C,
The purpose of this method is to improve the magnetic properties of the steel by obtaining the additive element A4"is zr s'ra nitride. This method is finally completed by 1150 nitride in a hydrogen atmosphere.
Recrystallization annealing is performed at ℃. However, this known method impairs the magnetism of the silicon steel sheet due to the incorporation of aUC by oxidation of the nitride in the atmosphere after dissociation. Therefore, the known method cannot be applied to nitriding armco iron parts of magnetic circuits.In addition, there is a method for producing grain-oriented electrical steel sheets with high magnetism (for example, Japan% Kensho No. 50-19489), and this method is Finish rolling is performed at 1200° C. while nitriding in a nitrogen atmosphere. By this treatment, nitrogen can be contained abundantly (α005 to α075), and the depth can be made to be more than AU of the steel plate thickness.

However, this method is only applicable to copper strips. Separately, the stress generated during finish cold rolling combines with the stress generated by the presence of the precipitation product -(N,C,01At) in the metal, increasing the number of lattice defects. This fact reduces the effect of the generated directional stress to the extent that it prevents a significant increase in the magnetic moment of the atoms in the matrix, so that only the JIk magnetic stress approaches that of pure iron.

In addition, 45-25 grade Periy Bar (Pe) containing 30*Fe, 25*Co, 45'% Ni
A method is known for heat treating perminvar (trade name), in which perminvar is heated to 425°C, isothermally soaked for 24 hours, and slowly cooled under the action of a magnetic field (R, Robert Ferromagn-et1z).
m# Inostrannaya Literatu
ra pubHshera.

Moscow, 1956).

The main effect of this treatment is a constant magnetic permeability in low fields and a unique form of hysteresis looseness, which indicates low hysteresis losses in medium fields f. Furthermore, this processing method to impart these properties is time consuming and requires high costs for processing the alloy. Furthermore, the positive effect is unstable and the method is not useful for imparting non-minvar properties to non-alloyed steels.The main object of the present invention is to provide a method for treating Armco iron parts. This method has a physical effect on the electronic structure and crystals of the iron, imparting high wear resistance to the 11N peak, and also enables a verminova type hysteresis loop. can be blown up.

The purpose of this is that in the nitriding method, which consists of heating the Amco iron part under a magnetic field, constant temperature soaking, and cooling, the heating is carried out at a temperature of m degrees at which active elements are formed in the nitriding medium. Immediately apply a constant magnetic field with an intensity of 16 to 5 oKA/m and perform constant temperature soaking in a phosphorizing medium in two stages.
The treated narrow surface is then heated to prevent oxidation in the air [
This is achieved by cooling the part to K.

The nitrogen potential of the nitriding medium was maintained at a level that led to the formation of α-wUf# forms of nitrogen in the iron during the first constant temperature soaking treatment, and at a level that led to the formation of Σ-nitrides in the iron during the second stage; The ratio of the periods of the first stage and the second stage should be 9:1. According to the magnetic circuit component of the present invention, strong magnetism is applied to the thin iron plate in which the magnetic circuit is constructed. Additionally, the disclosed round blade method is a means of alloying iron with nickel or nickel. A type of history loop can be added to commercially available armco iron without relying on it.

Preferred embodiments of the invention will now be described with reference to the accompanying drawings.

A component or sample made of Armco iron is placed in a furnace and heated under an atmosphere of nitrogen and hydrogen at a nitrogen potential sufficient to form an α-solid solution of the element in the iron. As soon as the temperature in Matsufuru reaches 450℃,
．． A tonic magnetic field of 6 KA/dense is applied. Furthermore, under the action of a magnetic field, heating at 620 °C and constant temperature soaking treatment in the first stage were performed for 5 days.
The second stage soaking treatment was carried out for 4±1 minutes at a %l elementary potential sufficient for the formation of Σ-nitrides for 6±1 minutes.
Cool to 100°C and then remove the magnetic field.

The magnetic sensitivity obtained by this geography is 2B5-α5 T%B+o=x 0.837% BIS-
1-12 T s B2o=1.27 T % B
io-1,34T 5Bso = 1.47 T%
B100 = 1.7 T4oKA/, in a magnetic field of 450
The magnetic sensitivity obtained by heating at ~620°C, soaking treatment, and cooling to IOO°C is as follows.2B5-064
T%B1o=a96T%B15-1.2T%B2G-1
,31T, Bso-14s'r, B50-1-6T
sB1oo-1,82T 0 In a magnetic field of 80 KA/m, the magnetic sensitivity obtained by heating 1 soaking treatment at 620-750 °C and cooling to 100 °C is as follows = BS = α68Ts B10”1.0
1 T, B15-123T, B2゜=132"
%Bso = 1.46 T%Bso-L 65 Ts
Bloo” 1.84 T.

The hysteresis loop of a sample made of Armco iron processed according to the disclosed method is shown in the figure. so A/
At a magnetic field of m (curve a), there are practically no hysteresis losses and a constant magnetic permeability is observed. 160A/m
field (curve b), the permeability is 136 to 144 A/
It is constant between corners and then increases to widen the hysteresis loop. At magnetic field strengths of 2.4 KA,/m (curve ale), the hysteresis loop typically becomes a perminvar type book, however, at 400 A/m
At magnetic field strengths of and 1.08/A, the magnetization curve exhibits constant magnetic permeability.

A magnetic field strength of 1,6 to 80 KA/m seems practical for stones.

This is because weak magnetic fields produce almost no effect, while too strong magnetic fields produce almost no effect, and require complicated large-wave devices.

Thus, the disclosed method of nitriding parts made of Armco iron increases magnetic flux density, a factor that improves the performance of electromagnetic tools and equipment. Furthermore, according to this method, it is expected that Armco iron can be used instead of Permin Pearl K in manufacturing magnetic circuit parts.

[Brief explanation of the drawing]

The drawings represent the magnetization curves and hysteresis loops of Armco iron nitrided in constant magnetic fields of various strengths. Patent applicant's agent Fumi Sato (one person) Continued from page 1 ■Applicant Valentin Grigoryevich Pavlyukov Soviet Union Slatov Prospekt Lenina 32 Kwarchila 8 ■Issuance Requester Polis Mikhailovich Gusev Soviet Union Stratov Uritsutsa Sierko Vychnaya 204 Kwarchila 23

Claims (1)

[Claims] l A method of nitriding a magnetic circuit component made of Armco iron by heating it in the presence of a magnetic field, subjecting it to a constant temperature soaking treatment, and cooling it, the heating being carried out at a temperature at which active nitrogen is formed in the nitriding medium. I went there and gave my friend L6~80K A/m.
A nitriding method that consists of applying a magnetic field with a strength of , applying a constant temperature soaking treatment in a nitriding medium in two stages, and then cooling the treated surface to a temperature that prevents oxidation in the air. 2 The nitrogen potential of the nitriding medium is maintained at a level sufficient to form an α-solid solution of nitrogen in the iron in the first stage of constant temperature soaking, and the nitrogen potential of the nitriding medium is maintained at a level sufficient to form an α-solid solution of nitrogen in the iron in the second stage of constant temperature soaking. Patent for nitriding parts of a magnetic circuit made of armco iron, characterized in that the formation of Σ-nitriding is maintained at a sufficient level and the time ratio between the first and second stages is 9:l. The method according to claim 1.