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WR5,WR20

Tungsten-rhenium alloys WR5 and WR20

ВР5, ВР20

WR5 and WR20 – a tungsten-rhenium alloy. In WR5 alloy contains 95% tungsten and 5% rhenium and WR20 contains 80% tungsten and 20% rhenium. The alloys are produced in the form of wire, and to improve the stability of the thermocouple WR5 alloy doped SILICA components: Al2O3 0,1-0,5%, SiO2 0,1-0,5%, KCl 0,1-0,5%. This connection is – VAR 5/20.

The main characteristics of the alloy is determined rhenium and tungsten.

Rhenium has a melting point of 3170 ° C and a boiling point of 5870 ° C, while it is very heat resistant and corrosion resistant. Tungsten rhenium and a little more than a refractory, hard and heavy metal. It has a melting point of 3410 ° C and boils at 6690 ° C. The alloys of tungsten and rhenium are among the most solid and refractory to all known.

The alloy used as a negative electrode of the thermocouple for maximum thermoelectromotive force. Metallurgy used rhenium in the alloy is not more than 20%, which gives the maximum temperature to 2500 ° C, using a tungsten-rhenium thermocouple. The alloy is very resistant to helium, hydrogen, dry nitrogen and argon.

The disadvantage is the fact that rhenium – a very rare metal, and this increases the cost and the price VR5 / 20 greatly exceeds the price of thermocouples of other metals. It does not use an alloy wire from different parties, because each party wire your indicator of thermoelectric power.

Alloys WR5 and WR20 are used for the manufacture of contact sensors thermocouples that measure the highest temperature measurement devices, which may only be measured using a thermocouple. Thermocouples measure, such as the temperature of the molten metal. Tungsten-rhenium thermocouple is a better gauge of high temperatures in corrosive environments.

Alloy WR5 / 20 is used for the manufacture arrange that can operate even in a vacuum at a temperature of 1800 ° C.

Strapping Table tungsten-rhenium thermocouples WAR-5 (WR-5) / WR-20.

Table Nominal static characteristics of conversion WR (A) -1

The temperature of the working end ° C

T.e.d.s.mV for temperature, ° C

0 10 20 30 40 50 60 70
0 0 0,121 0,246 0,373 0,504 0,637 0,772 0,910
100 1,337 1,483 1.632 1,781 1,933 2,086 2,240 2,396
200 2,871 3,032 3,193 3,355 3,518 3,682 3,847 4,012
300 4,512 4,680 4,843 5,016 5,185 5,354 5,523 5,693
400 6,203 6,373 6,543 6,714 6,834 7,065 7,225 7,396
500 7,908 8,073 8,248 8,418 8,588 8,758 8,928 9,098
600 9,605 9,774 9,943 10,111 10,280 10,448 10,615 10.783
700 11,283 11,450 11,616 11,782 11,947 12,112 12,277 12,442
800 12,933 13,096 13,259 13,422 13,584 13.746 13,907 14,068
900 14,549 14,708 14,867 15,026 15,184 15,342 15,500
1000 16,125 16,281 16,436 16,590 16,744 16,898 17,051
1100 17,659 17,810 17,960 18,110 18,260 18,409 18,557
1200 19,146 19,292 19,438 19,583 19,728 19,872 20,015
1300 20,584 20,725 20,866 21,006 21,145 21,284 21,423
1400 21,971 22,107 22,242 22,377 22,511 22,645 22,778
1500 23,306 23,436 23,566 23,696 23,825 23,953 24,081
1600 24,588 24,713 24,838 24,962 25,085 25,209 25,331
1700 25,816 25,936 26,056 26,175 26,293 26,411 26,528
1800 26,992

Main technical data

Temperature ° C 1600 1500 1400
Nominal value teds, mV 24,59 23,31 21,97
Teds deviation from nominal, mV ±102 ±99 ±96