| EPSRC Reference: |
GR/N23998/01 |
| Title: |
MECHANISMS OF THERMAL DEGRADATION IN 3RD GENERATION SUPER-HARD PVD COATINGS |
| Principal Investigator: |
Rainforth, Professor WM |
| Other Investigators: |
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| Researcher Co-Investigators: |
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| Project Partners: |
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| Department: |
Materials Science and Engineering |
| Organisation: |
University of Sheffield |
| Scheme: |
Standard Research (Pre-FEC) |
| Starts: |
01 May 2001 |
Ends: |
31 March 2003 |
Value (£): |
209,833
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| EPSRC Research Topic Classifications: |
| Materials Characterisation |
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| EPSRC Industrial Sector Classifications: |
| Aerospace, Defence and Marine |
Manufacturing |
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| Related Grants: |
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| Panel History: |
| Panel Date | Panel Name | Outcome |
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29 Jun 2000
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Structural Materials 29.6.00
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Deferred
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Summary on Grant Application Form |
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Property retention at elevated temperatures (up to 1000oC) is fundamental to the sustained performance of PVD nitride multilayer coatings in dry high speed cutting operations. Interdiffusion and oxidation rates are key determinants in property degradation at elevated temperature such as loss of hardness and chipping due to tribo-oxidation. Careful control of deposition parameters and coating chemistry is essential in order to engineer optimised microstructures for coatings having greatest resistance to failure in unlubricated high speed machining operations. However, not only is there little understanding about the fine scale structure and composition of these multilayers, but there has been no detailed research conducted to elucidate the fundamental mechanisms of structure degradation at elevated temperature. These key microstructural elements will be investigated using ultra sensitive thermo gravimetry, FEGTEM, (HREM, ESI and EDX) and surface analysis (XPS, SLAMS, SIMS) to explore phase distribution in particular that of quarternary additions such a Y (in both as deposited and thermally exposed samples), which may serve to reduce the kinetics of oxidation. Finally coated carbide tools shall be tested under industrially relevant high speed cutting conditions with cutting speeds up to 25000 rpm to compare friction and the degradation mechanisms with those observed in the laboratory.
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Key Findings |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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Potential use in non-academic contexts |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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Impacts |
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| Description |
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk |
| Summary |
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| Date Materialised |
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Sectors submitted by the Researcher |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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| Project URL: |
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| Further Information: |
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| Organisation Website: |
http://www.shef.ac.uk |