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Sapphire Tungsten Rhenium Alloy Wire Production Process

Details: Category: Tungsten Information; Published on Friday, 27 September 2013 19:50; Hits: 1824

1.1 powder preparation and doping techniques

Preparation of low temperature pre-reduction of suitable phase composition of blue tungsten oxide , and tungsten blue oxide is doped tungsten powder acid , tungsten powder as needed , and control the ratio of rhenium powder .

Doping uniformity is the first element control , to be able to obtain a stable in terms of purity , scale, and the particle size requirements of the three indicators . tungsten-rhenium alloy wire

The use of advanced hydrogen reduction equipment, as well as doping , pickling, large capacity V-type mixed powder machine , especially for hydrogen production system optimization , for the implementation of powder technology to provide reliable protection .

1.2 sintering and molding processing technology cogging

Using isostatic round billet rolling through vertical melt after blooming , which is tungsten and molybdenum Solton most advanced processing technology , preparation of billet single weight 3 kg , the use of high-power -controlled vertical melt equipment, to stable obtain density , purity and grain size , etc. to meet the requirements of the master index tungsten rhenium billet .

Blooming accommodate large rolling method billet , to achieve quality and efficient, large-scale production of the best processing methods. Solton tungsten and molybdenum technology uses KDCKS three multi-stand rolling mill rolls and master its system technology. At present, most enterprises still use rotary forging billet made to open , but open up technology and equipment, molds, auxiliary facilities and so has shrunk, with advanced rationality.

1.3 swaging and stretching techniques

Multimode string forging more with welding, high frequency continuous annealing , Big Wheel and multimode continuous drawing machine drawing machine applications, using a large compression rate processing, oxidation annealing , using condensate crystal drawing dies , etc., composed this section technical characteristics .

Using a large compression ratio stretched to the protection of tungsten rhenium wire has good high temperature performance with excellent positive significance. Has adopted pass compression rate specification , ¢ 3.7-0.7mm range of 30% -40%, ¢ 0.7-0.2mm range of 18% -28 % . Four to ten die mold sliding multimode drawing machine has been applied .

1.4 Electrochemical Processing Technology

Since sapphire tungsten rhenium alloy wire with multi- supplier status with white silk , so it is necessary to wash separately electrolytic corrosion , galvanic corrosion and electrolytic polishing reducing effect.

1.5 Control Management Technology

Because they have a better grasp of APT and ammonium perrhenate from raw materials to final products, all tungsten rhenium wire process control and management techniques to develop more scientific focus of the process measurement and control standards, and has a full range of advanced testing methods, Solton tungsten and molybdenum Technology is focused on creating ¢ 1.0-0.2mm range crack detection system .

1.6 Equipment Technology : mixer, reduction furnace , vertical melt equipment, rotary swaging machine, wire drawing machine, electrochemical etching equipment, testing equipment and packaging machines.

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Tungsten-Rhenium Alloy Wire Using Profile and Performance

Details: Category: Tungsten Information; Published on Friday, 27 September 2013 19:41; Hits: 1847

Tungsten-based alloy elements added rhenium, tungsten alloy. The rhenium content of the alloy is typically: 1%, 3%, 5%, 20%, 25% and 26% and so on. Tungsten often bred in the grain interface microcracks, these micro-crack is caused by tungsten broken off an important reason. Tungsten-rhenium alloy is formed in the deformation twinning process easy, thus reducing the stacking fault energy of layers, reduce the grain boundary movement of dislocations impedance, resulting in increased mobility of dislocations promote tungsten solution softened. This phenomenon is called "rhenium plasticizing effect." Tungsten rhenium alloy series, the low concentration of rhenium rhenium plasticizing effect is obvious, rhenium, rhenium concentration is high plasticizing effect decreases.

Tungsten-rhenium alloy wire for tungsten rhenium thermocouples

W-3Re/W-25Re, W-5Re/W-20Re, W-5Re/W-26Re, W/W-26Re, 2: Binding for single crystal sapphire sapphire tungsten rhenium wire or tungsten rhenium alloy wire used Model: W-25Re, 0.5mm diameter

Tungsten-rhenium alloy has a series of excellent properties such as melting point, high strength, high hardness, high ductility, high recrystallization temperature, high resistivity, low vapor pressure, low electron work function, and low ductility brittle transition temperature.

Tungsten-rhenium alloy addition to the above performance, low-rhenium alloy and high-rhenium alloy wire thermocouple into the match, with a high thermoelectric power values. Various types of tungsten rhenium thermocouple thermoelectric power value and temperature relationships.

Sapphire single crystal tungsten rhenium wire binding with commonly used models: W-25Re, 0.5mm diameter.

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Tungsten-Rhenium Wire Thermocouples Classification and Use

Details: Category: Tungsten Information; Published on Friday, 27 September 2013 19:33; Hits: 1788

1, Tungsten rhenium thermocouples classification. Included in the national standards of tungsten rhenium thermocouples in two ways:

A, Tungsten rhenium 5 - 26 tungsten rhenium, its positive nominal composition of 95% tungsten, 5% rhenium, tungsten cathode a nominal composition of 74%, 26% rhenium. Indexing number of WRe5-WRe26, abbreviated: W-Re5/26.

B, 3 tungsten rhenium - tungsten rhenium 25, its positive nominal composition of 97% tungsten, 3% rhenium, tungsten cathode a nominal composition of 75% and 25% rhenium. Indexing number of WRe3-WRe25, abbreviated: W-Re3/25.

2, The use of tungsten-rhenium thermocouples. Current measuring a temperature above 1600 ℃, the use of non-contact method, however, the method of error is large, such as the contact law can accurately measure the real temperature. In the high-temperature thermocouples, precious metal thermocouples are expensive and the maximum temperature only in 1800 ℃ below, while tungsten rhenium thermocouple temperature limit is not only high, but good stability, therefore, tungsten rhenium thermocouples in metallurgy, building materials, aerospace , aviation and nuclear industries have been widely used. Rich resources of tungsten, tungsten-rhenium thermocouples cheap, can be partially substituted precious metal thermocouples, it is the high-temperature test promising field of temperature materials.

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Tungsten-Rhenium Wire Thermocouple Temperature and The Use of Environmental

Details: Category: Tungsten Information; Published on Friday, 27 September 2013 19:37; Hits: 1744

Tungsten-rhenium wire thermocouple temperature

Its maximum temperature can reach 2800 ℃, however, higher than 2300 ℃, the data is scattered. Therefore, the use of temperature, preferably at about 2000 ℃.

The use of tungsten rhenium wire thermocouple atmosphere

Easily oxidized tungsten-rhenium thermocouples, suitable for hydrogen in an inert or dry use, or dense protective tube isolated in order to use it with oxygen. Carbon-containing atmosphere can not be used (as in the use of hydrocarbon-containing atmosphere, the temperature exceeds 1000 ℃ i.e. by corrosion). Tungsten or tungsten-rhenium in a carbonaceous atmosphere is easy to form a stable carbide, that reduce the sensitivity and cause brittle fracture, in the case of the presence of hydrogen, is accelerated carbonation.
5, tungsten-rhenium thermocouples antioxidant. The issue has been a subject of concern to scholars at home and abroad, and is committed to study and solve. Our company adopts the international advanced making process, successfully developed a high temperature and pressure fabricated W-Re thermocouple, the temperature of the product range is 0 ~ 1800 ℃, widely used in metallurgy, coking, chemical furnace, heat treatment, glass and other industries, it has a high accuracy, low price, stable performance, the work atmosphere free from restrictions, etc., instead of platinum and rhodium thermocouple is the ideal product. I produced the W-Re thermocouple in Zhuzhou Cemented Carbide Works, Zigong Cemented Carbide factory and Shenyang Branch of the instrument, such as units, widely used, the performance reached the level of similar foreign products.

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The Advantage of Tungsten Rhenium Thermocouples

Details: Category: Tungsten Information; Published on Friday, 27 September 2013 19:28; Hits: 1827

Tungsten-rhenium thermocouples with temperature a good linear relationship between electric potential, thermal stability, reliable, cheap, etc., can be directly measured liquids, steam and gases such as temperature. Tungsten-rhenium thermocouples can partially substitute platinum-rhodium thermocouple as high metallurgical industry, high-temperature electronic structure of thermoelectric systems engineering and space vehicles, ultra-high temperature nuclear reactors measurement tools.

Tungsten-rhenium thermocouples for temperature dependence of thermopower meet ZBN05003-88 indexing table, equivalent ASTME696-84 standards. In a vacuum, reducing, inert atmosphere, it is possible within the range 0 ~ 2300 ℃ use. Tungsten-rhenium thermocouple protection tube using a special tungsten rhenium even can at 1600 ℃ under oxidizing atmosphere, long-term use, its price is lower than the platinum-rhodium thermocouple.

Tungsten-rhenium thermocouples is 1931 by Goedecke (Ge virtues g) first developed out at 60 to 70 years to develop the most successful refractory metal thermocouples. Tungsten-rhenium thermocouple is characterized by: a high melting point hot wire (3300 ℃), vapor pressure, easily oxidized; in a non-oxidizing atmosphere, good chemical stability. Emf, high sensitivity, the most important is cheap.

Tungsten-rhenium thermocouples indexing with W / (W-26Re), (W-3Re) / (W-25Re), (W-5Re) / (W-26Re) and (W-5Re) / (W-20Re ), etc. Long-term use temperature of 2000 ~ 2400 ℃, short-term use up to 3000 ℃.

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