Hielscher - Ultrasound Technology

Controllable and reproducible ultrasonication is needed to perform cavitation erosion testing in accordance with ASTM Standard G32-92. Hielscher ultrasonic devices can be used for the direct and indirect erosion testing of samples.

Hielscher manufactures ultrasonic processors, that have a fixed frequency (e.g. 20kHz) and an adjustable amplitude. Such ultrasonic devices can be used for the testing of the erosion resistance of materials according to the ASTM G32-92.

The typical setup (right picture) for erosion testing consists of:

• ultrasonic generator
• ultrasonic transducer
• (booster horn)
• sonotrode
• jacketed (cooled) fluid container

In case of the direct cavitation, the sample is attached to the sonotrode tip. In case of an indirect cavitation testing, the sample is positioned facing the sonotrode in a distance of 0.5 to 0.7mm from the sonotrode tip surface.

The fluid is distilled water at 25±2 degC at ambient pressure.

To obtain accurate results it is important to run at a specified amplitude, e.g. at 50 micron. Hielscher ultrasonic processors monitor the mechanical amplitude every 1/20000th of a second (20kHz). This ensures, that the sample is exposed to the accurate amplitude during the full sonication time.

The devices UIP500, UIP1000 and UIP2000 are suitable for ASTM G32-92 testing. We can supply each of these units with an accurate amplitude measurement protocol of the mechanical amplitude at the sonotrode tip. We recommend using either of these devices with a sonotrode BS2d22 (22mm diameter) and a stand ST2.

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