Application of wolframrene thermocouples
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The basis of tungsten-rhenium alloy BP5 is tungsten, which has extreme refractoriness, its melting point is 3410 ° C. The heat resistance of rhenium combined with the highest resistance to corrosion allows it to form a worthy pair of tungsten, a melting point of 3170 ° C. Tungsten-rhenium alloys in terms of refractoriness and hardness are superior to other materials. When doping tungsten 5% Re, the plasticity of the BP5 alloy increases, which is used in the thermocouple as a positive electrode.
To achieve the maximum thermo-emf of a tungsten-rhenium alloy and use as a negative electrode in it should be up to 35% Re. Domestic metallurgy produces alloys containing up to 20% Re. This makes it possible to measure t ° to 2500 ° C, while maintaining stability to Ar2, He2, N2 and H2. When alloying with siliceous additives, the stability of the alloy is significantly increased to t ° 2000 ° C.
Category of alloys
Due to the fluctuations in the thermo-emf values of tungsten-rhenium thermoelectrode pairs, BP alloys are divided into categories. Category A-1 is used at t ° 2200 ° C; A-2 and 3 — up to t ° 1800 ° C. Do not use wire from different lots, because Each of the lots has its own indicators of thermo-emf.
Tungsten-rhenium thermocouples are indispensable for measuring very high temperatures in metallurgical furnaces. The error to 2500 ° C is ± 0.01 ° C. The cost of VR thermocouples depends on the price of tungsten and rhenium. Because they are quite expensive, and their production is associated with a number of difficulties. The cost of thermocouples based on the alloys of BP5, BP20 is not small. Nevertheless, it is much lower than the cost of alternative instruments for high-temperature thermometry.
|Temperature ° С||1400||1500||1600|
|Nominal value of thermo-emf, mV||21.97||23.31||24.59|
|Deviation of the thermo-emf from the nominal, μV||± 96||± 99||± 102|
Buy at the best price
You can get more detailed information about the products, clarify their quality and place an order with the help of the website of the company «_", where a large assortment of thermocouples is available that can satisfy the most demanding customer requirements. «Unlimited choice of products from tungsten-rhenium alloys, Including brands BP5 and BP20, is intended for wholesale and retail customers. Convenient delivery and constant attention to the client will make the purchase from us as comfortable as possible, and the compliance of all semi-finished products with high quality standards will guarantee reliable operation of such products in any areas of the industrial complex. A diverse parameter of the products presented in our warehouse from will allow us to easily select the necessary option to realize any engineering intentions.