油潤滑下におけるSr_xCa_<1-x>CuO_y粉末の潤滑特性

概要

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Double oxide, Sr_xCa_<1-x>CuO_y has a layered structure in which Ca(Sr) is sandwiched between CuO_2 layers. This crystal structure is expected to give low friction due to its low shear strength between laminas. In this work, various kind of Sr_xCa_<1-x>CuO_y with x= 0.0 to 1.0 were prepared from SrCO_3, CaCO_3 and CuO by sintering method. The compositions of these products were examined by X-ray diffraction. The sample powders were blended in oil (squalane) and grease, and their load carrying capacities were evaluated by a cylinder-on-plate type tribometer and a four-ball machine, respectively. As a result of the tests, Sr_xCa_<1-x>CuO_y with x=0.0, 0.14, 0.90 and 1.0 showed low friction (about 0.1) and high load carrying capacity (4900 N) . It was found from SEM and EPMA results that the worn surface was smooth, and that a thin solid lubricating film containing Ca, Sr and Cu was formed on the rubbing counterface. Also, the oxides with x=0.9 and 1.0 showed superior properties under extreme pressure in four-ball machine testing.
社団法人日本セラミックス協会の論文
1998-08-01