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W3Re-W25Re thermocouple material and preparation method of thermocouple

A thermocouple and alloy material technology, applied in the field of W3Re-W 25Re thermocouple material and its preparation of thermocouples, can solve the problems of reducing the temperature measurement accuracy of tungsten-rhenium thermocouples, dispersion of thermoelectric potential, large difference in temperature measurement tolerance, etc. Achieve the effect of improving the response speed of temperature measurement, increasing the rate of components, reducing splitting and brittle fracture

Active Publication Date: 2012-07-18
CHONGQING MATERIALS RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are three types of tungsten-rhenium thermocouples widely used in the market: W3Re-W25Re, W5Re-W26Re and W5Re-W20Re. The W3Re produced by domestic and foreign manufacturers is doped with silicon, aluminum, potassium or other elements are added on this basis. , in order to improve the recrystallization temperature and mechanical properties of the alloy, but as the tungsten-rhenium alloy wire diameter becomes thinner, the splitting and brittle fracture of the W3Re alloy wire become more serious, and as a thermocouple material, the tungsten-rhenium alloy except In addition to good mechanical properties, it is more important to have stable thermoelectric properties. However, the thermoelectric potential of W3Re alloy wire doped with silicon, aluminum, and potassium elements is relatively dispersed, and the potential inhomogeneity of a single batch is usually 5 ~8°C, seriously reducing the temperature measurement accuracy of tungsten-rhenium thermocouples, affecting its popularization and application
As an alternative material for platinum-rhodium noble metal thermocouples, the temperature tolerance of the fast W3Re-W25Re thermocouple wire for molten steel temperature measurement is ±0.25%t (1500-1800°C), and the wire diameter is Φ0.08-0.1mm. There is a large difference from the temperature measurement tolerance (±0.125%t) of platinum-rhodium thermocouple wire, and there is still a big gap to replace platinum-rhodium thermocouple wire
In foreign countries, there is no report on the application of fine W3Re-W25Re to the temperature measurement of molten steel.

Method used

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  • W3Re-W25Re thermocouple material and preparation method of thermocouple
  • W3Re-W25Re thermocouple material and preparation method of thermocouple
  • W3Re-W25Re thermocouple material and preparation method of thermocouple

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Comparison scheme
Effect test

Embodiment 1

[0044]A W3Re-W25Re thermocouple material, including a negative electrode W25Re alloy material and a positive electrode W3Re alloy material, and the negative electrode W25Re alloy material is composed of the following components by weight percentage:

[0045] W: 74.2%; Re: 25.8%

[0046] The preparation method of negative pole W25Re alloy material comprises the following steps:

[0047] a) Weigh 1000g W powder and 500.8g NH 4 ReO 4 (Re: 347.7 grams);

[0048] b) Preparation of pre-alloyed powder: W powder, NH 4 ReO 4 , 400ml of absolute ethanol and 400±10g of Φ15~20mm balls, put it on a ball mill for ball milling, the ball milling speed is 100~200r / min, and the time is 20 hours; take out the mixture, evaporate the absolute ethanol to dryness in a water bath, and grind it at 1200~1300℃H 2 Reduction under ambient conditions for 2 hours to obtain W25Re pre-alloyed powder;

[0049] c) Forming: the pre-alloyed powder is pressed into a billet of about 13mm×13mm×400mm on a 500t ...

Embodiment 2

[0058] A W3Re-W25Re thermocouple material, including a negative electrode W25Re alloy material and a positive electrode W3Re alloy material, and the positive electrode W3Re alloy material is composed of the following components by weight percentage:

[0059] W: 96.5%; Re: 3.5%;

[0060] The preparation method of cathode W3Re alloy material comprises the following steps:

[0061] a) Weigh 2000g W powder and 104.4g NH 4 ReO 4 (Re: 72.5 grams);

[0062] b) Preparation of pre-alloyed powder: W powder, NH 4 ReO 4 , 500ml of absolute ethanol and 550±10g of Φ15~20mm balls, put them on a ball mill for ball milling, the ball milling speed is 300~400r / min, and the time is 15 hours; take out the mixture, evaporate dry ethanol in a water bath, 1000~1100℃H 2 Reduction under ambient conditions for 3 hours to obtain W3Re pre-alloyed powder;

[0063] c) Forming: the pre-alloyed powder is pressed into a billet of about 13mm×13mm×400mm on a 500t hydraulic press;

[0064] d) Pre-sintering...

Embodiment 3

[0072] The positive electrode W3Re alloy material (with cobalt added) consists of the following components by weight percentage:

[0073] W: 97%; Re: 2.5%; Co: 0.5%

[0074] The preparation method of positive electrode W3Re alloy material (addition of cobalt), comprises the following steps:

[0075] a), weighing 2000 grams of W powder, 50.9 grams of Co(NO 3 ) 2 .6H 2 O (Co: 10.3 g) and 74.2 g NH 4 ReO 4 (Re: 51.5 g).

[0076] b), preparation of pre-alloyed powder: W powder, Co(NO 3 ) 2 .6H 2 O, NH 4 ReO 4 , 550ml of absolute ethanol and 600±10g of Φ15~20mm balls, put them on a ball mill for ball milling, the ball milling speed is 200~300r / min, and the time is 18 hours. 2 Reduction under the atmosphere for 2.5 hours, that is, the preparation of cobalt-containing W3Re pre-alloyed powder,

[0077] c) Forming: the pre-alloyed powder is pressed into a billet of about 13mm×13mm×400mm on a 500t hydraulic press;

[0078] d) Pre-sintering: sintering at 1300-1500°C for 3 ho...

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Abstract

The invention discloses a W3Re-W25Re thermocouple material and a preparation method of a thermocouple. A negative pole W25Re alloy material comprises the following components in percentage by weight: 74.2%-75.5% of W and 24.5-25.8% of Re, a positive pole material W3Re alloy material comprises the following components in percentage by weight: 96.0%-97.5% of W, 2.5%-3.5% of Re, 0-0.5% of Co, 0-0.5% of Al and 0-0.5% of rare earth. The preparation method of the thermocouple comprises the following steps of: (a) respectively weighing all the components of the negative pole W25Re alloy material and the positive pole material W3Re alloy material according to the percentage by weight; (b) preparing pre-alloy powder; (c) forming; (d) pre-sintering; (e) performing vertical melting; (f) swaging; (g) drawing; (h) cleaning; (i) annealing; and (k) performing performance test and indexing calibration. The W3Re-W25Re thermocouple material disclosed by the invention can achieve the level of a precious metal thermocouple wire and improve temperature measurement response speed, temperature measurement precision and stability.

Description

technical field [0001] The invention relates to a thermocouple material, in particular to a W3Re-W 25Re thermocouple material and a method for preparing the thermocouple. Background technique [0002] With the development of modern technologies such as aerospace and deep-sea exploration, more stringent requirements have been placed on the physical and chemical properties of materials. Therefore, higher requirements have been placed on the control of the preparation process of materials, especially the precise control of temperature. At present, the contact thermocouples used for measurement in the high-temperature field are mainly precious metal series and tungsten-rhenium series. Compared with expensive and scarce precious metals, my country's tungsten-rhenium resources are abundant and cheap, and tungsten-rhenium thermocouples have higher melting points, Strength, thermal electromotive force and recrystallization temperature are widely used in petrochemical, metallurgical s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C27/04B23P15/00
Inventor 陈德茂刘奇阳浩辛雪军王瑞轩
Owner CHONGQING MATERIALS RES INST
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