The mechanical strength of phosphates under friction-induced cross-linking
Pawlak, Zenon, Yarlagadda, Prasad, Frost, Ray L., & Hargreaves, Douglas (2006) The mechanical strength of phosphates under friction-induced cross-linking. Journal of Achievements in Materials and Manufacturing Engineering, 17(1-2), pp. 201-204.
Purpose: In the present study, we consider mechanical properties of phosphate glasses under high temperatureinduced and under friction-induced cross-linking, which enhance the modulus of elasticity.
Design/methodology/approach: Two nanomechanical properties are evaluated, the first parameter is the
modulus of elasticity (E) (or Young's modulus) and the second parameter is the hardness (H). Zinc meta-, pyro
- and orthophosphates were recognized as amorphous-colloidal nanoparticles were synthesized under laboratory
conditions and showed antiwear properties in engine oil.
Findings: Young's modulus of the phosphate glasses formed under high temperature was in the 60-89 GPa range.
For phosphate tribofilm formed under friction hardness and the Young's modulus were in the range of 2-10 GPa
and 40-215 GPa, respectively. The degree of cross-linking during friction is provided by internal pressure of
about 600 MPa and temperature close to 1000°C enhancing mechanical properties by factor of 3 (see Fig 1).
Research limitations/implications: The addition of iron or aluminum ions to phosphate glasses under high
temperature - and friction-induced amorphization of zinc metaphosphate and pyrophosphate tends to provide
more cross-linking and mechanically stronger structures. Iron and aluminum (FeO4 or AlO4 units), incorporated
into phosphate structure as network formers, contribute to the anion network bonding by converting the P=O
bonds into bridging oxygen. Future work should consider on development of new of materials prepared by solgel
processes, eg., zinc (II)-silicic acid.
Originality/value: This paper analyses the friction pressure-induced and temperature–induced the two factors
lead phosphate tribofilm glasses to chemically advanced glass structures, which may enhance the wear
inhibition. Adding the coordinating ions alters the pressure at which cross-linking occurs and increases the
antiwear properties of the surface material significantly.
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|Item Type:||Journal Article|
|Keywords:||Mechanical Properties, Phosphates, Friction-Induced Cross-Linking|
|Subjects:||Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Catalysis and Mechanisms of Reactions (030601)|
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MECHANICAL ENGINEERING (091300)
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering|
Past > QUT Faculties & Divisions > Faculty of Science and Technology
Past > Schools > School of Engineering Systems
|Copyright Owner:||Copyright 2006 International OCSCO World Press|
|Deposited On:||17 Jun 2009 23:49|
|Last Modified:||29 Feb 2012 23:20|
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