Grain oriented electrical steel flat products with insulating coating

A technology of grain orientation and insulating coating, applied in the coating process of metal materials, layered products, magnetic properties of inorganic materials, etc., to achieve the effect of excellent density and low porosity

Inactive Publication Date: 2018-04-27
THYSSEN KRUPP STAHL AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although the stability of the composition was improved, the tension applied to the ferromagnetic substrate was not as good as that of the Cr-containing reference product

Method used

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  • Grain oriented electrical steel flat products with insulating coating
  • Grain oriented electrical steel flat products with insulating coating
  • Grain oriented electrical steel flat products with insulating coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0096]A series of aqueous compositions for insulating coatings according to the invention were prepared according to the components given in Table 1 below. A set of control solutions is also included in this series of compositions for comparative purposes, and this protocol does not form part of the present invention. If not otherwise stated, all percentages are given in % by weight, and for rows 1-21 of Table 1, the % by weight values ​​are based on the total weight of the slurry composition.

Embodiment 2

[0098] The key physicochemical properties of the composition prepared in Example 1 were evaluated. In particular, its sedimentation behaviour, viscosity and gelation rate were studied. The results are summarized in Table 2 below.

[0099] according to figure 2 The method shown determines the sedimentation behavior as a function of time. For this, the composition was incubated for 6 hours at room temperature. Where phase separation was observed, the volumes of the two phases were determined. The sedimentation after 6 hours is given as the volume of the deposited phase as a percentage of the total volume (see figure 2 , 100*V 0 / V x ).

[0100] The viscosity of each solution was measured immediately after its preparation. Viscosity measurements were performed using a Brookfield DV-II+ viscometer (spindle: LV1, drive: 50 rpm, T=50°C).

[0101] The parameter "time for gelation" in Table 2 refers to the time required until the solution is gelled. The time point of gelat...

Embodiment 3

[0105] A 0.30 mm thick grain oriented electrical steel sample (ie, with a forsterite coating according to the prior art) was coated with the treatment solutions 1-21 listed in Table 1 in the box-annealed state. The coating is performed using a roll of a coater. The thickness of the coating after baking was measured and determined to be 2.25 μm by SEM FEG microscope or magnetic induction device (eg Fischer Permascope). The baking temperature varies from 800°C to 950°C.

[0106] It was found that the addition of core-shell filler particles to the composition according to the invention is accompanied by an enhanced Young's modulus, the so-called effective Young's modulus, measured by the Oberst beam method, of the resulting coating.

[0107] This effect can be explained by the Hashin-Shtrikman model according to:

[0108]

[0109] C1 volume fraction of filled particles

[0110] C2 volume fraction of finished coating matrix: C2=1-C1

[0111] image 3 A data graph showing t...

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Abstract

A grain oriented electrical steel flat according to the invention comprising an insulating coating applied to at least one surface of said flat, the insulating coating comprising a matrix comprising phosphate and silicon dioxide. The insulating layer also includes filler particles comprising a core of high Young's modulus material and a shell surrounding the core and of a material that binds the filler particles to the substrate. In this way, the need to add chromium compounds to the insulating coating of grain oriented electrical steel flats can be avoided.

Description

technical field [0001] The invention relates to a grain oriented electrical steel flat bar comprising an insulating coating applied to at least one surface of the flat bar, said insulating coating comprising a matrix comprising phosphate and silicon dioxide. Background technique [0002] In the field to which the present invention pertains, "flat material" means a strip, sheet, blank, etc. obtained by hot-rolling or cold-rolling base steel. [0003] Grain oriented electrical steel is a ferromagnetic iron material, which is an important component for the production of high-efficiency transformers and high-power high-performance generators. It is used as the basic core material for electrical transformers such as distribution transformers, power transformers and small transformers in the form of laminated, coiled or blanked sheets. Usually, the grain-oriented electrical steel is strip-shaped, and the thickness is between 0.15mm and 0.50mm. [0004] In order to meet the high ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/12H01F1/18
CPCC21D8/1288H01F1/18C23C22/74C21D8/1283C21D2201/05B32B2307/206C21D8/02C23C22/00
Inventor 蒂埃里·贝尔格朗克里斯托夫·里巴克雷吉斯·勒迈特卡斯滕·舍佩尔斯
Owner THYSSEN KRUPP STAHL AG
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