The mechanical strength of phosphates under friction-induced cross-linking

• Autorzy: Pawlak Z. , Yarlagadda P. K. D. V. , Frost R. , Hargreaves D.
• Języki publikacji: EN

Abstrakty

EN

Purpose: In the present study, we consider mechanical properties of phosphate glasses under high temperature-induced 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 sol-gel 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

Słowa kluczowe

EN

mechanical properties; phosphate; friction-induced cross-linking

PL

właściwości mechaniczne; fosforan; połączenia krzyżowe wzbudzane tarciem

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2006
• Tom: Vol. 17, nr 1-2
• Strony: 201--204
• Opis fizyczny: Bibliogr. 47 poz., wykr.

Twórcy

autor

Pawlak Z.

• Queensland University of Technology, School of Engineering Systems, GPO Box 2434 Brisbane, Q 4001, Australia
• University of Technology and Engineering, 85-326 Bydgoszcz, Poland

autor

Yarlagadda P. K. D. V.

• Queensland University of Technology, School of Engineering Systems, GPO Box 2434 Brisbane, Q 4001, Australia

autor

Frost R.

• Queensland University of Technology, School of Engineering Systems, GPO Box 2434 Brisbane, Q 4001, Australia

autor

Hargreaves D.

• Queensland University of Technology, School of Engineering Systems, GPO Box 2434 Brisbane, Q 4001, Australia

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