Tohoku University Technology: Surface modification method using flow cavitation: T04-206_T05-248
Surface modification method to improve fatigue strength of metallic material by impact force generated during bubble collapse
Cavitation is a phenomenon where a liquid becomes an air bubble due to the decrease of saturated steam pressure of the liquid caused by pressure decrease occurred by the velocity increase of a liquid. In particular, group-row cavitation consisting of microbubbles produces a large impact force. Cavitation shotless peening which uses this phenomenon, has a smoother machined surface and higher fatigue strength than the method which uses steel balls (shot peening). Operation in air is also possible without using a water tank, by injecting a high speed water jet into a low speed water jet.
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The revenue generated from technology transfer is reinvested as new research funding for universities and researchers, and is utilized to create further research outcomes. To ensure the smooth operation of this cycle, known as the "Intellectual Creation Cycle," we will vigorously promote technology transfer. The types of seeds we handle include patents, know-how, databases, and programs. We have established a collaborative framework by signing basic technology transfer agreements with the following universities (as of June 1, 2025): Tohoku University, Hirosaki University, Iwate University, Akita University, Fukushima University, Yamagata University, Tohoku Gakuin University, Iwate Medical University, Fukushima Medical University, Aizu University, Miyagi University, Hokkaido University, Muroran Institute of Technology, and Showa Medical University.
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