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Center of collective use of scientific instruments

     Laboratory gas analysis in metals and alloys "

Laboratory gas analysis in metals and alloys "based on physical and technological institute of metals and alloys NAS and is intended to determine the nitrogen, oxygen and hydrogen, which dissolved and included in the composition of chemical compounds in metal alloys.

      FTIMS NAS through centralized supply through budgetary funds NAS received analyzer nitrogen and oxygen in the metallic and other inorganic materials TS-500 and hydrogen analyzer RHEN-602 of LECO.

      Instruments TC-500 and RHEN-602 is a modern research facilities that can determine with high accuracy of the content of gases in alloys.

      In accordance with the technical specification for the device TS-500 mass samples at about 1 g range measurements for oxygen is 0,00005% - 0,2% (0,5 ppm - 2000 ppm), and for nitrogen 0.00005% - 3% (0.5 - 30,000 ppm). In this analysis the total content of gas in metals: dissolved and that is part of the chemical compounds.

      Principle of the device TS-500 is that the test sample that is analyzed, melts in graphite crucibles in a resistance furnace in a stream of helium. Oxygen that this released, connected to graphite crucible and forms CO and CO2. These gases, together with helium through the catalyst, where the oxidizing CO to CO2. Further reduction of the intensity measured by infrared radiation, which is caused by absorption of CO2. This proportional decrease of oxygen content, determined. After filtering the flow of gases CO2 and N2O, nitrogen and helium that were left in the stream, come in the box, where the principle of thermal conductivity of two different gases (a mixture of nitrogen and helium, unlike pure helium) is nitrogen.

      In accordance with the technical specifications for hydrogen analyzer RHEN-602 range measurements for hydrogen is 0001% - 0025% (10 ppm - 250 ppm), the duration of the analysis - 7 minutes. Nominal weight of sample 1 yr

      Principle is that the test sample that is analyzed, melts in graphite crucibles in a stream of argon. Gaza provided a sample along with argon, through the catalyst, where CO oxidized to CO2 and through to the sinks to detain CO2 and moisture. The mixture of gases in the remaining available through molecular filter that filters nitrogen in thermal conducto-metric cell, where the principle of thermal conductivity of two different gases (a mixture of hydrogen and argon unlike pure argon) is determined by the content of hydrogen.

      Technical specification for equipment TS-500 and RHEN-602 does not include any restrictions on the research, depending on the chemical composition of alloys, which are analyzed. However, such restrictions exist. They are related, such as high chemical activity of the objects of study or a penchant for sublimation when heated. That both can lead to damage of equipment and access them from the system.

      Restrictions other nature-related need for continued use of expensive consumables. These primarily related standards (those or other alloys known to the appropriate content of gas that is analyzed, needed for the calibration before the analysis). For example, in accordance with the specification for the device RHEN-602 set cost standards for hydrogen titanium alloys has cost about two thousand euros.

      Graffiti crucible to melt samples of single use. For averaging evidence analysis is conducted three times for each alloy. According to the specification value of a graphite crucible, for example, the analysis of hydrogen is about 1.5 euros. Thus, the cost of three single crucible, which is used for one alloy is about thirty USD.

      Rough calculation shows that the total cost of consumable materials (crucibles, standard samples, helium, argon, filters and others.) Excluding energy costs and the cost of water,
at three fold repeated analysis of one alloy is within 50 -200 USD. depending on the alloy that is analyzed, that is required in each case, the graphite crucible and standard samples.

      The high cost of standard samples and their diversity can not include the list in delivery. Package delivery device TS-500 that goes from the specifics of the Institute, includes the standard samples of alloys based on iron and one standard for copper and nickel alloys. There may be a situation where for the order to conduct research will need to purchase additional standards.

      Thus, specific studies on the gas company LECO is a constant need to replenish supplies and expensive expansion set of standard samples for stable and efficient work of the laboratory. Obviously, the limiting element in the laboratory is not so much the length of time that is allocated to those and other studies as providing laboratory consumables.

      Following the main provisions of the Center for collective use, as set out by the Presidium of NAS of Ukraine № 322 of 28.04.2004 on "laboratory gas analysis in metals and alloys" FTIMS NAS can guarantee a free service for other organizations only with the cost of materials, which included in the delivery device.

       The order of service in accordance with the Order of the Presidium of ANAS number 322 of 28.04.2004 was as follows:

      1. Scientific institutions and organizations NAS that need to conduct research on the device TS-500 and RHEN-602, two times a year to 15 January and 15 June to submit in writing to the Bureau of Physical and technical problems in their application materials and deadlines types of studies (of the alloys, gases that are analyzed).

      2. Director FTIMS NAS, which has information on the overall distribution of time between a customer allocated to collective use devices TS-500 and RHEN-602, based on availability at the Laboratory gas analysis consumables, his order, which is consistent with the Bureau of Physical-Technical Problems materials, determines work schedule gas analyzers, sets the required number of changes with regard to performance FTIMS NAS and NAS scientists need to use these devices.

      3. When planning the use of work time devices TS-500 and RHEN-602 Director FTIMS NAS may use different use of time for their own needs and paid services. However, free collective use devices Center remains unchanged, i.e. 3 hours at 8 - hour working days and 4 hours at 12 - hour working days.

      Work on the gas analyzers TS-500 and RHEN-602 is done only by the specialist centers.

 

        Preparation of study

      In the instructions to operate the TC-500 analyzer in the description of sample preparation to the study, noted that as the samples allowed shaving, cover a piece of alloy that is analyzed. You must make reservations for obtaining an accurate analysis of content of gases in alloys (dissolved or that the composition of chemical compounds) in the preparation of samples for analysis should be excluded oxidation or contamination of adverse substances. Saving the presence in samples of hidden now and shells. Production samples conducted customer. These dimensions agree with the performers. Samples to analyze the content of hydrogen in the production should not overheat.

      Serving device TS-500 is provided by qualified personnel who have long experience in the gas company LECO.

 

Tell: 3 (8044) 424-21-22 Khusnutdinov G.D., Khoruzhiy V.J.

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