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Antioxidative tungsten-rhenium alloy for thermocouple and preparation method

A rhenium alloy and tungsten oxide technology, applied in the field of alloys, can solve the problems of easy oxidation of the surface of the wire, affecting the temperature measurement accuracy and application, etc., to achieve the effect of improving the anti-oxidation performance and ensuring the temperature measurement accuracy

Active Publication Date: 2016-04-20
CHONGQING MATERIALS RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Once these alloys leave the area, even during use, the surface of the wire is easily oxidized, which affects its temperature measurement accuracy and application

Method used

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  • Antioxidative tungsten-rhenium alloy for thermocouple and preparation method
  • Antioxidative tungsten-rhenium alloy for thermocouple and preparation method
  • Antioxidative tungsten-rhenium alloy for thermocouple and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Weigh 1000g of tungsten powder, 75.5g of ammonium rhenate, and 4g of lanthanum nitrate hexahydrate. The purity of the tungsten powder is ≥99.95%, the average particle size is 1.0-7.0μm, the particle size is in a normal mass distribution, and the shape is spherical or polygonal. Add lanthanum nitrate hexahydrate into 500ml of absolute ethanol to dissolve, then add tungsten powder and stir until it becomes a slurry, evaporate to dryness in a water-bath evaporator and keep stirring until it becomes a thick paste, stop stirring, and continue heating until the thick paste is completely Evaporate to dryness to obtain powder. The evaporated powder and ammonium rhenate were dispersed in a high-energy dispersing device at a speed of 120 r / min for 16 hours to obtain tungsten-rhenium pre-alloyed powder. After the tungsten-rhenium pre-alloy powder is molded, it is held in cold isostatic pressing with a pressure of 150MPa for 600s, then vertically melted and sintered, and kept at 19...

Embodiment 2

[0040] Weigh 1000g of tungsten powder, 480g of ammonium rhenate, 10g of cobalt nitrate hexahydrate, and 3g of lanthanum nitrate hexahydrate. Add cobalt nitrate hexahydrate and lanthanum nitrate hexahydrate into 500ml of absolute ethanol to dissolve, then add tungsten powder and stir until it becomes a slurry, evaporate to dryness in a water-bath evaporator and keep stirring until it becomes a thick paste, then stop stirring and continue heating until The thick paste was completely evaporated to dryness to obtain a powder. Disperse the evaporated powder and ammonium rhenate in a high-energy dispersing device at a speed of 130 r / min for 18 hours to obtain tungsten-rhenium pre-alloyed powder. After the tungsten-rhenium pre-alloy powder is molded, it is held in cold isostatic pressing with a pressure of 200MPa for 700s, then vertically melted and sintered, and kept at 2200A for 20min. After cooling, it is kept at 3300A for 40min to obtain a sintered billet. The sintered billet is...

Embodiment 3

[0042] Weigh 1000g of tungsten powder, 44.5g of ammonium rhenate, and 3g of cerium nitrate hexahydrate. Add cerium nitrate hexahydrate to 500ml of absolute ethanol to dissolve, then add tungsten powder and stir until it becomes a slurry, evaporate to dryness in a water-bath evaporator and keep stirring until it becomes a thick paste, stop stirring, and continue heating until the thick paste is completely Evaporate to dryness to obtain powder. Disperse the evaporated powder and ammonium rhenate in a high-energy dispersing device at a speed of 100 r / min for 15 hours to obtain tungsten-rhenium pre-alloyed powder. After the tungsten-rhenium pre-alloy powder is molded, it is held in cold isostatic pressing with a pressure of 150MPa for 400s, then vertically melted and sintered, and kept at 2100A for 20min. After cooling, it is kept at 3050A for 30min to obtain a sintered billet. The sintered billet is opened according to the processing rate of 15%, and the heating temperature is 1...

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Abstract

The invention relates to an antioxidative tungsten-rhenium alloy for a thermocouple and a preparation method. The alloy comprises the following components in percentage by weight: 1%-26% of Re, 0.05-0.8% of an antioxidative element and the balance of W, and is prepared by prealloy powder preparation, molding, vertical sintering, drawing, white wire forming, annealing and the like, the temperature measurement precision of a thermocouple material reaches the level of wires of a platinum-rhodium noble-metal thermocouple, compared with the oxidation resistance of a conventional thermocouple wire, the oxidation resistance of the alloy is remarkably improved, particularly in a medium-temperature section and a low-temperature section, wire oxidation speed can be reduced or wire oxidation can be delayed effectively, obvious oxidation onset temperature can be reduced effectively, and temperature measuring precision of the alloy is guaranteed.

Description

technical field [0001] The invention relates to an alloy, in particular to an oxidation-resistant tungsten-rhenium alloy used for thermocouples and a preparation method thereof. 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, metallur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C27/04C22C1/04C22F1/18C25F3/26G01K7/02
CPCG01K7/02C22C1/045C22C27/04C22F1/18C25F3/26B22F2998/10B22F9/24B22F3/04B22F3/105B22F3/24
Inventor 薄新维刘奇何浩然王小宇蒋春东陈德茂
Owner CHONGQING MATERIALS RES INST
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