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Machining of Fe49Co2V alloys used in electrical machines; investigation and evaluation of coating effects on their magnetic and mechanical properties

Khazraji, Saddam 2019. Machining of Fe49Co2V alloys used in electrical machines; investigation and evaluation of coating effects on their magnetic and mechanical properties. PhD Thesis, Cardiff University.
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Abstract

Greater usage of soft magnetic composites will depend on attainment of higher magnetic permeability, higher induction and greater mechanical strength. Permeability and induction depend upon the compacted density of the component. In this research, by using Zinc stearate as a lubricant and compacted at different compaction pressure and temperatures, improvement in mechanical and magnetic properties has been achieved in Fe49Co2V alloy. The result shows that, the green density of specimens compacted at 130°C and 550 MPa for Zinc stearate content of 1.5wt% was measured to be 7.836 g/cm3 and the green density of specimens compacted at 820 MPa reached 7.951 g/cm3. While the highest value of sintered densities achieved at 130°C and 820 MPa with 1.5wt% Zinc stearate for specimens with curing time two hours and one hour are 8.133 and 8.054 g/cm3, respectively. The maximum sintered bending strength achieved at 130°C and 820 MPa with 1.5wt% Zinc stearate for specimens with two hours was measured to be 3907MPa. In addition, significant improvement in magnetic and electrical properties have been obtained, the electrical resistivity of specimens compacted at elevated temperature and sintering at two-hours holding time is higher than those produced by compaction at room temperature and one-hour holding time. The losses of specimens with 1.5wt% Zinc stearate compacted at 130°C and 820 MPa was smaller than specimens compacted at same parameters with different Zinc stearate amount. At low frequencies (<2 kHz) for 1.5wt% specimens compacted at 130°C and 820MPa is higher than that compacted at room temperature, RT. Significant improvement in mechanical properties has been obtained in Fe49Co2V alloy by using silicone resin as an insulation material. Silicone resin content and annealing operation have clear effect on the mechanical properties. The study revealed that, the mechanical properties achieved by using 4.0wt% silicone resin and annealed at 600°C. Significant improvement in magnetic and electrical properties have been obtained. It was found that the higher electrical resistivity and magnetic permeability achieved with 4.0wt% silicone resin specimens and annealed at 600°C. As a result, the magnetic losses will decrease.

Item Type: Thesis (PhD)
Date Type: Completion
Status: Unpublished
Schools: Engineering
Uncontrolled Keywords: Magnetic Properties; Soft magnetic composite materials; Warm compaction method; Silicone resin coated; Zine stearate and lubricant method.
Date of First Compliant Deposit: 27 June 2019
Last Modified: 27 Jun 2019 09:23
URI: http://orca-mwe.cf.ac.uk/id/eprint/123758

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