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We newly developed the prototype calcium complex grease (Cx-S) which delivered a better temperature performance than traditional calcium complex greases and could keep its structure even over 200°C. This was achieved by combining the common calcium complex thickener technology with a new concept. In this report, the bearing life of several grease types was evaluated by ASTM D 1741. It was demonstrated that the bearing life of Cx-S wasn’t as long as urea grease, although it had excellent anti-oxidation performance. Additionally, leakage rate was calculated by the amounts of leaked grease from bearings during the test. Therefore, it was suggested that a physical factor such as shear stability of the grease is likely to cause shorter bearing life. Then, by using behenic acid instead of stearic acid to improve shear stability of Cx-S it was found that behenic type calcium complex grease (Cx-B) forms much thicker and stronger fiber micelles than stearic type (Cx-S). As a result, the shear stability of Cx-B was strongly improved and bearing life was extended by 50% compared to Cx-S.

Study into Structural Impact of Novel Calcium Complex Grease Delivering High Temperature Performance