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Details of Grant 

EPSRC Reference: EP/G033471/1
Title: A study of methods to produce MAX phases in thin films at temperatures below 700 degrees C
Principal Investigator: Colligon, Professor J
Other Investigators:
Vishnyakov, Professor V
Researcher Co-Investigators:
Project Partners:
Applied Multilayers Ltd Teer Coatings Ltd
Department: Chemistry and Materials
Organisation: Manchester Metropolitan University
Scheme: Standard Research
Starts: 01 August 2009 Ends: 31 October 2012 Value (£): 310,452
EPSRC Research Topic Classifications:
Materials Characterisation Materials Processing
Surfaces & Interfaces
EPSRC Industrial Sector Classifications:
Related Grants:
Panel History:
Panel DatePanel NameOutcome
09 Dec 2008 Materials Prioritisation Panel 9th Dec Announced
Summary on Grant Application Form
The so-called MAX phases comprise three elements formed into a compound. M is one of the early transition metals (Sc, Ti, V, Cr, Zr, Nb, Mo, Hf, Ta), A is usually one of the group III A or IV A elements (Al, Si, P, S, Ga, Ge, As, Cd, In, Sn, Tl, Pb) but can also include Cd, P, S or As and X is either C or N which adds to the previously selected two elements. Their general form is Mn+1AXn where n is 1,2 or 3 and depends on the different stacking sequence of the MX block between the A-element layers. They were initially discovered in the 1960's by Nowotny et al who studied their structure. Engineering properties have been neglected until recently when it was found, by Barsoum and his colleagues, that one of these highly ductile materials (Ti3SiC2) was thermal shock resistant and oxidation resistant even at temperatures in excess of 1000oC . Thus these materials have ceramics properties yet are easy to machine.The potential application of such coatings is wide-ranging; they can be applied to cutting tools, end mills, machine components operating at high temperature, turbine blades and pipelines carrying high temperature fluids. Their composition and layered structure makes them useful for corrosion- and radiation-resistant applications with possible application as cladding layers in the nuclear industry.Conventionally the materials have been synthesised from the bulk at temperatures about 1400oC but thin film Ti3SiC2 has been formed at 1200oC by Chemical Vapour Deposition (CVD) and this compound and other phases can be formed at 900-1000oC on a suitable substrate using magnetron sputtering. For an economically viable industrial process however the process temperature needs to be reduced. Many substrates are not stable at high temperatures, for example steel, containing as low as 0.25% C, undergoes a phase transition at 723oC.The main thrust of this proposal is to develop techniques which will produce thin film MAX phases based on Ti-Si-C and Ti-Al-N at temperatures below 700oC.There are 2 novel approaches to be explored: sequential deposition of the layer components and addition of energy in the form of energetic particle collisions at the growing film surface. The sequential deposition will be achieved by switching source targets using sputtering methods, or, by pulsing different precursor gases in the CVD process. There are also concerns to be addressed in terms of deposition conditions, impurities can prevent correct nucleation of the MAX phases, single crystal substrates may be needed and a seeding layer could be required. Having formed the thin MAX phase layers they will be analysed for their correct structural properties using high resolution microscopy and for mechanical properties by measuring hardness and friction. Thermal stability will be judged from thermal cycling experiments. The coatings have high industrial interest and Teer Coatings Ltd and Applied Multilayers Ltd are supporting this programme.
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Organisation Website: http://www.mmu.ac.uk