Projects
Projects: Projects for Investigator |
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| Reference Number | EP/H005145/1 | |
| Title | High temperature piezoelectric materials | |
| Status | Completed | |
| Energy Categories | Energy Efficiency(Transport) 35%; Not Energy Related 65%; |
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| Research Types | Basic and strategic applied research 100% | |
| Science and Technology Fields | PHYSICAL SCIENCES AND MATHEMATICS (Metallurgy and Materials) 100% | |
| UKERC Cross Cutting Characterisation | Not Cross-cutting 100% | |
| Principal Investigator |
Professor AJ Bell No email address given Institute of Materials Research University of Leeds |
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| Award Type | Standard | |
| Funding Source | EPSRC | |
| Start Date | 01 October 2009 | |
| End Date | 31 March 2013 | |
| Duration | 42 months | |
| Total Grant Value | £88,524 | |
| Industrial Sectors | Aerospace; Defence and Marine | |
| Region | Yorkshire & Humberside | |
| Programme | NC : Physical Sciences | |
| Investigators | Principal Investigator | Professor AJ Bell , Institute of Materials Research, University of Leeds (100.000%) |
| Industrial Collaborator | Project Contact , Goodrich Large Engine Control Systems (0.000%) |
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| Web Site | ||
| Objectives | ||
| Abstract | The proposed project concerns the development of piezoelectric materials for use in actuators at high temperatures (200C<T<450C). Specifically, the piezoelectric materials are to be tailored for low to medium frequency use in aero-engine controls. It is proposed the work be carried out by a PhD student. The project follows on from original work in this field at the University of Leeds, funded by Goodrich Engine Controls and the Technology Strategy Board. Goodrich is to contribute 30,000 in cash towards to the total cost of the project.The global market for piezoelectric devices is currently more than 3.4 billion and is expanding at more than 11% p.a., 2% above the rate of the global electronics industry itself. The sector with the largest predicted growth is that of multilayer actuators, with a predicted annual growth rate of 19.2%. The growth is led by demand from a range of industries in a variety of applications. In Europe, a significant fraction of the growth in the actuator market is being fuelled by their introduction into automotive diesel injection systems. The order of magnitude increase in response speed of the piezoelectric device, compared to conventional solenoids, provides benefits in power output, fuel economy and emissions of both CO2 and particulates.This proposal is motivated mainly by developments in aviation, specifically for the introduction of piezoelectric actuators as controls in civil aircraft gas turbines. The availabilityof piezoelectric actuators with high temperature capability to replace conventional electromagnetic and pneumatic controls in jet engines would not only allow weight saving, but the increase in actuation speed would enable a range of additional functions leading to improved fuel economy and noise reduction. The maximum operating temperatures of such systems would vary, dependent upon position in the system, but is generally in the range from 200 to 450C. The lower end of this range may be manageable with variants on PZT, the current market leader, but the upper end requires new materials.Our previous work has shown that doping the BiFeO3-PbTiO3 ceramics system with La produces piezoelectric materials that can achieve strains gretaer than that of PZT to temperatures beyond 300C. Whilst conferring a number of advantages, La doping results in a significant reduction in Tc compared to the undoped BiFeO3-PbTiO3 and the high temperature resistivity needs to be increased still further.The proposed work therefore aims to implement additional modifications to the BiFeO3-PbTiO3 system, that whilst maintaining good piezoelelctric performance, do not reduce the Curie temperature catastrophically. Secondly, additional doping to increase resistivity will be implemented. Moreover, with a focus on the applications, performance will be assessed in terms of the maximum induced strain and electrical time constants as a function of temperature, rather than the more conventional measurements of d33 and resistivity | |
| Publications | (none) |
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| Final Report | (none) |
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| Added to Database | 25/06/09 | |
