The University of Southampton
Engineering and the Environment

Research project: Suspension sprayed surface coatings for specialised applications

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Thermal spraying is a well established process for producing metal, oxide and carbide based coatings from wire or powder feedstock. In the past decade a modification of this process has attracted increasing levels of attention. Called Suspension Spraying, it uses a nano-sized powder in a liquid suspension, or a completely liquid precursor. The liquid is injected into the spray jet and under the action of the thermal energy and gas velocity produces a coating on the substrate. The advantage is that the precursors can be nano-sized (this is not possible with standard dry powder feeders) and the coatings can be very thin, smooth and finely structured, even nano-structured.

Project Overview

Suspension Spraying uses a nano-sized powder in a liquid suspension, or a completely liquid precursor. The advantage is that the precursors can be nano-sized and the coatings can be very thin, smooth and finely structured, even nano-structured. This research aims to deposit thermally-sensitive materials such as TiO2-anatase or hydroxyapatite, with minimal thermal decomposition. The industrial sponsor of this project, TWI Ltd., is intending to establish Suspension Spraying capability at its Cambridge laboratory, whilst simultaneously conducting scientific research into the main coating types that its industrial members are interested in.

As-recieved Ti02 nano-particles
As-recieved Ti02 nano-particles
Suspension HVOF spraying process
Suspension HVOF spraying process
SEM surface of Ti02 coating
SEM surface of Ti02 coating
SEM cross-section of Ti02 coating
SEM cross-section of Ti02 coating
Scratch test on the coating and the illustration diagram
Scratch test on the coating

Associated research themes

Materials and surface engineering

Related research groups

national Centre for Advanced Tribology at Southampton (nCATS)
Engineering Materials

Staff

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