Papers by Keyword: Eruption

Abstract: Dynamic setting analysis of Tianchi Volcano future eruption is discussed by combining the analysis result of focal mechanism with that of structural geology. Analyzing anatectic earthquake focal mechanism shows that subduction of West Pacific Plate to the northeast of China makes the Tianchi Volcano region appear to press west-eastward. And analyzing focal mechanism of near-surface foci earthquake tells us that in the region, direction of the axis of the largest principal compression stress is NEE. The research result of structural geology displays that NWW faults around Tianchi is very active since Epipleistocene. Tianchi Volcano future eruption can be controlled by subduction of West Pacific Plate and strike-slip faulting along the NWW. In the end, the dynamic setting of Tianchi Volcano future eruption is put forward.

Abstract: The oxidation behavior of carbides on Inconel 718 surface was investigated. Oxidation tests were performed at the temperature range of 300 to 650°C. Two types of carbide, NbC and TiC were detected, and the amount of NbC was significantly higher than that of TiC. The oxidation of NbC started at the carbide surface and the matrix interface, and propagated into the interior of the carbide and eruption subsequently occurred with increasing oxidation time. In case of TiC, the oxidation occurred at the outer surface of the carbide and the matrix interface, but did not propagated into the interior of the carbide. Oxides formed on the outer surface of the TiC contained a relatively large amount of elemental Nb. The cross-section of oxidized specimen was investigated. NbC was oxidized more easily due to the significantly lower Gibbs free energy of oxidation than that of TiC. Eruption occurred mainly at the NbC because the Pilling-Bedworth ratio of Nb is higher than the critical value of 2.3 where eruption typically occurs.