FINOCAS Activity Report 2020-2021

Page 74

Bonding varnish, a universal solution In recent years, the electric motor has been increasingly used to replace the conventional combustion engine in order to reduce carbon emissions. Now, the electrification of vehicles is urgently demanding high-performance motors. Electrical steel, a high silicon containing and thin sheet steel, is the soft magnetic material for the motor’s stator and rotor. These are composed of hundreds of stacked magnetic steel sheets. Insulation coatings on both sides of the electrical steel sheet obstruct the interlaminar eddy current, excited by the alternating magnetic field. Conventionally, welding/interlocking/clamping techniques are used to fix the magnetic core. These conventional fixation techniques have a huge impact on the magnetic properties of the electrical steel.

With interlocking, a mechanical connection is made between adjacent laminations by partially punching a tab through the thickness of the lamination and later pressfitting this tab into a matching depression on the top surface of the lamination stamped immediately prior. This approach works well for thicker steels, but becomes more challenging the thinner the steel. Interlocking and welding also introduce short circuit paths between the laminations, as they penetrate through, or bridge across, the insulating core plate coating on the steel surface, creating eddy current paths. Though this effect has been known for some

time, more recent work has shown that, with the use of thinner steels and higher fundamental core excitation frequencies, the adverse effects of interlocking and welding on unitised core magnetic performance are increased.

DOUBLE FUNCTIONALITY To overcome this drawback, an approach has been developed over the last 10-15 years, whereby the laminations are bonded together using an adhesive. Several competing approaches have been developed using a glue in the stamping process or a mill-applied bondable coating. The risk in

applying a glue between the laminations is incompatibility between adhesive and core plate coating on the steel to be bonded, which can vary between steel suppliers. The bonding varnish is a more universal solution: directly applied on the electrical strip, which has a double functionality, it acts as an insulating material, as well as to bond laminations when thermally activated under pressure. The curing process comprises of 2 stages: (1) The first stage is the drying phase in which a dry, non-sticky, flexible and still reactive coating is formed, withstanding


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Articles inside

Flanders Metals Valley, climate-neutral and circular metallurgical cluster in Flanders

1min
pages 194-195

List of publications 2020-2021

7min
pages 196-204

Knowledge building

3min
pages 188-189

The strength of combining instruments

1min
pages 180-181

Accurate precipitate analysis made easy

3min
pages 176-179

Microscopy service centre: our analytical tools

3min
pages 168-171

Solution-driven operators using an industry-oriented approach

1min
pages 172-173

Virtual manufacturing at the customers’ service

3min
pages 160-163

Correlative APT-TEM analysis of precipitates

2min
pages 174-175

Extend your lab with the OCAS microscopy centre

2min
pages 164-167

How image digitalisation and data mining help to improve the surface quality of hot rolled steel

2min
pages 156-159

HSLAi: When HSLA meets AI

1min
pages 154-155

Machine learning takes microstructure-based material design to the next level

3min
pages 150-153

Introduction

2min
pages 148-149

Preparing future metallic coatings with IMpACT

1min
pages 134-135

Going beyond steel: Exploring the processing of ever more complex and higher melting temperature alloys

2min
pages 138-141

Lab synthesis of customised materials: continuous extension of our offer

2min
pages 146-147

Using combinatorial methodology to get a better understanding of the intermetallic precipitation strengthening

2min
pages 136-137

Assessment thermo-mechanically control rolled-plate capability

1min
pages 132-133

Cold-rolled high-strength steels offer keeps growing

2min
pages 129-131

Hot-rolled high-strength steels brought to the next level

3min
pages 126-128

Decarbonisation of steelmaking: the challenge

2min
pages 120-121

XCarb™ green steel offer

2min
pages 122-123

Preparing hot-rolled steels for the future

2min
pages 124-125

Serving as technical support lab to production plants

4min
pages 114-117

Introduction

2min
pages 118-119

Durable technical support

1min
pages 112-113

Magnificent Magnelis®

1min
pages 106-107

Corrosion prediction models

3min
pages 108-111

Wear testing: experimental and numerical approach

7min
pages 94-97

Keeping tight connections

3min
pages 102-105

Cryogenic tests with CO2 in the Tubular Testing System

2min
pages 100-101

Fast response prevents failure

1min
pages 90-91

Structural health monitoring renders industrial assets smart

1min
pages 88-89

Challenging design criteria for improved fatigue performance

2min
pages 92-93

OCAS delivers accelerated fatigue testing equipment

1min
pages 85-87

Better understanding of fatigue performance

3min
pages 82-84

Electrical steels to power vehicle electrification

1min
pages 70-71

Bonding varnish, a universal solution

2min
pages 74-75

Fatcor: corrosion fatigue for offshore applications

1min
pages 80-81

High strength meets high protection for solar

1min
pages 68-69

Introduction

2min
pages 78-79

Identification of electrical steel market needs through market intelligence analysis

3min
pages 72-73

Spray technology for more sustainable offshore wind towers

1min
pages 66-67

In-house welding wire development for the new saline-resistant weathering steel

1min
page 65

New saline weathering grade to reduce maintenance costs of offshore structures

2min
pages 62-64

Steel solutions for liquified natural gas

1min
pages 60-61

Automated fracture surface analysis

2min
pages 58-59

Introduction

5min
pages 38-41

Avoiding long-running cracks in natural gas pipelines

4min
pages 54-57

Sustainable steel solutions for CO2 transport and storage

2min
pages 50-52

Modelling brings toughness improvement to welded natural gas transmission pipelines

1min
page 53

Where failure analysis and electrochemistry meet

1min
pages 32-33

Steel for the hydrogen economy

6min
pages 42-49

Lifetime prediction of subsea bolts in natural seawater

1min
pages 34-35

Introduction

2min
pages 36-37

Inspection of coatings on bridges and risk analysis for repair

1min
page 31

Investment porfolio

1min
page 12

Burning ambition to prevent microbiologically influenced corrosion in fire extinguish pipe systems

2min
pages 28-30

IMSystems

1min
pages 18-19

An ocean of opportunities

1min
pages 26-27

WIZATA

1min
page 13

Value the future, upgrade the past

5min
pages 20-23

Ensuring sustainable endurance by research

2min
pages 24-25

KEYSTONE

1min
pages 16-17
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