Sm–Co high-temperature permanent magnet materials

Liu, Shiqiang

doi:10.1088/1674-1056/28/1/017501

Cited by 46 publications

(12 citation statements)

References 73 publications

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“…The substitution of Fe by Co in many compounds and alloys leads to a remarkable increase in the Curie point. For example, well-known Sm-Co systems [ 16 , 17 , 18 , 19 ] such as SmCo 5 (hexagonal structure, P6/mmm), Sm 2 Co 7 (hexagonal structure, P6/mmc), and Sm 2 Co 17 (rhombohedral structure, P6/mmc) are important. The adequate crystal structures of these systems are presented in Figure 2 .…”

Section: Brief Review Of High and Ultra-high Coercive Magnetic Materialsmentioning

confidence: 99%

High and Ultra-High Coercive Materials in Spring-Exchange Systems—Review, Simulations and Perspective

Chrobak

2022

Materials

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The paper refers to the spring-exchange magnetic systems containing magnetically soft and hard phases. This work consists of two parts. The first part is a brief review of hard magnetic materials, with special attention paid to ultra-high coercive compounds, as well as selected spring-exchange systems. The second part is a theoretical discussion based on the Monte Carlo micromagnetic simulations about the possible enhancement of the hard magnetic properties of systems composed of magnetically soft, as well as high and ultra-high coercive, phases. As shown, the analyzed systems reveal the potential for improving the |BH|max parameter, filling the gap between conventional and Nd-based permanent magnets. Moreover, the carried-out simulations indicate the advantages and limitations of the spring-exchange composites, which could lead to a reduction in rare earth elements in permanent magnet applications.

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Section: Brief Review Of High and Ultra-high Coercive Magnetic Materialsmentioning

confidence: 99%

High and Ultra-High Coercive Materials in Spring-Exchange Systems—Review, Simulations and Perspective

Chrobak

2022

Materials

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“…Strong permanent magnets (PM) are made from alloys of rare-earth elements [38,39]. Among the available types of magnets, ferrite and neodymium magnets do not work at temperatures above 200°C (Table 1).…”

Section: Permanent Magnetsmentioning

confidence: 99%

High Temperature Magnetic Sensors for the Hot Section of Aeroengines

et al. 2021

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Magnetic sensors are widely used in aeroengines and their health management systems, but they are rarely installed in the engine hot section due to the loss of magnetic properties by permanent magnets with increasing temperature. The paper presents and verifies models and design solutions aimed at improving the performance of an inductive sensor for measuring the motion of blades operated at elevated temperatures (200–1000 °C) in high pressure compressors and turbines. The interaction of blades with the sensor was studied. A prototype of the sensor was made, and its tests were carried out on the RK-4 rotor rig for the speed of 7000 rpm, in which the temperature of the sensor head was gradually increased to 1100 °C. The sensor signal level was compared to that of an identical sensor operating at room temperature. The heated sensor works continuously producing the output signal whose level does not change significantly. Moreover, a set of six probes passed an initial engine test in an SO-3 turbojet. It was confirmed that the proposed design of the inductive sensor is suitable for blade health monitoring (BHM) of the last stages of compressors and gas turbines operating below 1000 °C, even without a dedicated cooling system. In real-engine applications, sensor performance will depend on how the sensor is installed and the available heat dissipation capability. The presented technology extends the operating temperature of permanent magnets and is not specific for blade vibration but can be adapted to other magnetic measurements in the hot section of the aircraft engine.

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“…Strong permanent magnets (PM) are made from alloys of rare-earth elements [34,35]. Among the available types of magnets, ferrite and neodymium magnets do not work at temperatures above 200°C (Table 1).…”

Section: Permanent Magnetsmentioning

confidence: 99%

High Temperature Magnetic Sensors

Rokicki¹,

Przysowa²,

Kotkowski³

et al. 2021

Preprint

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Magnetic sensors are widely used in health management systems for turbomachinery, but their applications in the hot zone are limited due to the loss of magnetic properties by permanent magnets with increasing temperature. The paper presents and verifies models and design solutions aimed at improving the performance of an inductive sensor for measuring the motion of rotating objects operating at elevated temperatures (200-1000C), such as compressor and turbine blades. Physical, analog and mathematical models of the interaction of blades with the sensor were developed. A prototype of the sensor was made and its tests were carried out on the RK-4 rotor rig for the speed of 7000 rpm, in which the temperature of the sensor head was gradually increased to 1100C. The sensor signal level was compared to that of an identical sensor operating at room temperature. The heated sensor works continuously producing the output signal whose level does not change significantly. What is more, a set of six probes passed an initial engine test in an SO-3 turbojet. It was confirmed that the proposed design of the inductive sensor is suitable for blade health monitoring of the last stages of compressors, steam turbines as well as previous generation gas turbines operating below 1000C, even without a dedicated cooling system. In real-engine applications, sensor performance will depend on how the sensor is installed and the available heat dissipation capability

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Sm–Co high-temperature permanent magnet materials

Cited by 46 publications

References 73 publications

High and Ultra-High Coercive Materials in Spring-Exchange Systems—Review, Simulations and Perspective

High and Ultra-High Coercive Materials in Spring-Exchange Systems—Review, Simulations and Perspective

High Temperature Magnetic Sensors for the Hot Section of Aeroengines

High Temperature Magnetic Sensors

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