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Hot isostatic pressing for the production of bimetallic fuel pump bearings

Murray, Paul James (2016)
Eng.D. thesis, University of Birmingham.

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Abstract

This study investigated the feasibility of manufacturing bimetallic fuel pump bearings by Hot Isostatic Pressing (HIPping). The aim of the project was to reduce processing costs whilst maintaining or improving product quality. The process involved compacting, sintering and diffusion bonding Al 7wt%Si powder to 30 % leaded bronze.
The pre-processing HIP conditions including surface preparation of the leaded bronze liner, powder size, degassing temperature and degassing dwell time, had a significant effect on the bond strength. By optimising the HIP conditions, it was then possible to achieve a highly compacted Al-Si casing that had bonded to the leaded bronze by forming a thin, uniform and continuous diffusion bond interface.
The interface consisted of three intermetallic layers; Al2Cu, AlCu and Al2Cu3. Due to the brittle nature of the intermetallic layers, an increase in width resulted in a reduction in strength. An optimum bond width has been established and resulted in bond strengths up to four times greater than the current production bearings manufactured by flame spraying.
The project developed a manufacturing process for powder HIP bearings that offered a potential cost saving of 18%.

Type of Work:Eng.D. thesis.
Supervisor(s):Chang, I. T. H.
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Metallurgy and Materials
Additional Information:

Embargo till 30/09/2025

Subjects:TL Motor vehicles. Aeronautics. Astronautics
TN Mining engineering. Metallurgy
Institution:University of Birmingham
ID Code:7068
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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