Wyniki wyszukiwania - BazTech

1

An oxidation-resisitant measurement apparatus

An Dong-Yang, Dai Jing-Min, Xiao Peng

Metrology and Measurement Systems

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2019

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Vol. 26, nr 4

725--737

EN

On the basis of induction heating, radiation heating and liquid nitrogen refrigeration, high-temperature, medium-temperature, normal-temperature and low-temperature heating/refrigeration furnaces were designed, respectively. An apparatus with a wide temperature range and high accuracy applied to test oxidation resistance of materials has been developed based on the thermogravimetric method and the heat transfer principle. The apparatus consists of four heating/cooling systems, a specimen fixture positioning unit, a laser positioning unit, vertical and horizontal moving guide rails, and a high-precision weighing balance. The apparatus, based on the thermogravimetric method, is able to test oxidation resistance of materials. In the test, the temperature range was -180~3000°C (the highest temperature is determined by material properties). The temperature control accuracy was ±5°C. The accuracy of on-line weighing was ±0.1 mg. The measurement uncertainty was 0.2 mg. Compared with other relevant devices, this apparatus has its own advantages: simple operation, wide heating/cooling temperature range, sufficient specimen heating, high sensitivity and precision, and short heating/cooling time. The experimental results show that the developed apparatus presented in this study not only can be used for isothermal thermogravimetric tests, but also for thermal cycling tests and multi-step oxidation tests. With the effective integration of multiple heating apparatus and refrigeration apparatus, the apparatus breaks through the limitations of the heating/cooling temperature range of the existing devices, accomplishes the high-precision oxidation resistance test of materials in a wide temperature range, and will play a great role in improving the research of materials.

2

A 128-channel high precision time measurement module

Kang L., Zhao L., Zhou J, Liu S., An Q.

Metrology and Measurement Systems

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2013

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Vol. 20, nr 2

275--286

EN

In the external target experiment for heavy ion collisions in the HIRFL-CSR, Multi-Wire Drift Chambers are used to measure the drift time of charged particles to obtain the track information. This 128-channel high precision time measurement module is designed to perform the time digitization. The data transfer is based on a PXI interface to guarantee a high data rate. Test results show that a 100 ps resolution with a data transfer rate up to 40 MBps has been achieved; this module has also been proven to function well with the detector through a commissioning test.

3

Casting directly from a computer model by using advanced simulation software FLOW-3D Cast Ž

Sirviö M., Woś M.

Archives of Foundry Engineering

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2009

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Vol. 9, iss. 1

79-82

EN

ConiferRob - A patternless casting technique, originally conceived at VTT Technical Research Centre of Finland and further developed at its spin-off company, Simtech Systems, offers up to 40% savings in product development costs, and up to two months shorter development times compared to conventional techniques. Savings of this order can be very valuable on today's highly competitive markets. Casting simulation is commonly used for designing of casting systems. However, most of the software are today old fashioned and predicting just shrinkage porosity. Flow Science, VTT and Simtech have developed new software called FLOW-3D Cast Ž , which can simulate surface defects, air entrainment, filters, core gas problems and even a cavitation.