resumo
Copper zirconium phosphate hydrate (Cu(OH)(2)Zr(HPO4)2 center dot 2H(2)O, hereafter referred to as Cu-alpha-ZrP) with high crystallinity was directly synthesized in a NaF-CuO-ZrO-P2O5-H2O system under hydrothermal conditions. The copper ion was confirmed to be an exchangeable cation in the Cu-alpha-ZrP through elemental analysis and a proton ion exchange process. The crystal structure of the Cu-alpha-ZrP was determined ab initio by using X-ray powder diffraction data. In the structure, the CuO6 octahedron would be located in an exchangeable atom position. Moreover, Cu-alpha-ZrP was evaluated as an additive in grease in a four ball test. The maximum nonseizure load (P-B, representing the load-carrying capacity) of the base grease containing Cu-alpha-ZrP was increased from 353 to 1235 N. The excellent load-carrying capacity may be explained by the easier adherence of the material to the worn surface forming a tight protective film.
palavras-chave
TRANSITION-METAL IONS; INSOLUBLE ACID SALTS; CRYSTALLINE ZIRCONIUM; TETRAVALENT METALS; EXCHANGE; MECHANISM; MOLECULES; BEHAVIOR; SORPTION; GEL
categoria
Science & Technology - Other Topics; Materials Science
autores
Zhang, XS; Xu, H; Zuo, ZJ; Lin, Z; Ferdov, S; Dong, JX
nossos autores
Zhi Lin
Investigador Principalagradecimentos
This work was financially supported by the National Natural Science Foundation of China for Distinguished Young Scholars (20825623), Program for the Top Science and Technology Innovation Teams of Higher Learning Institutions of Shanxi, Program for the Shanxi Province Foundation for Returness, National Natural Science Foundation of China (50972098) and the Natural Science Foundation of Shanxi Province (2011011022-3). Z.L. appreciates the financial support from FCT (FCT/China-2010/2012), FSE, and FEDER.