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Why You May Need A Vacuum Sintering Furnace

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Why You May Need A Vacuum Sintering Furnace

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Basically, with sintering,fine and pure particles are molten together, reducing air inside of the structure, and enhancing many properties. Those properties include strength, purity, and even thermal and electric conductivity.

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Recreation > Travel > Hospitality > Hospitality Industry

Posted by webbvacuumfurnaces in Recreation on November 19th, 2016

If you've ever had to work with metals, then you may know about the "process of sintering". Sintering is basically when fine particles of metal are welded together, in order to form a strong non-porous structure, used for a variety of reasons.

Basically, with sintering,fine and pure particles are molten together, reducing air inside of the structure, and enhancing many properties. Those properties include strength, purity, and even thermal and electric conductivity.

It's a very vital process in manufacturing metal appliances in general. Because of that, high-tech tools are really vital for this process.

And one of the highest tech tools you can use is a vacuum sintering furnace!

What is a vacuum sintering furnace?

It is basically a type of oven that removes air in order to enhance the sintering process of metals. Sintering in general is a high heat process, and one of the risks of heating metals happens to be oxidation.

The last thing you need is for your pure metals to react in air, running the process of combining the pure metals into a stronger structure with better properties.

As such, you need technologies that remove air out of the heating chamber, while heating. That is what a vacuum sintering furnace is for, and is a must when seeking one from vacuum furnace manufacturers.

You may still not be convinced of the need to get a furnace for your work, when you really may need one! As such, we're going to present below a few industries where such furnaces are vital to enhance the industry!

Here's a list of the many uses of furnaces!

The first would be the dental industry. Sintering is really important there, especially when manufacturing tools or dental parts necessary for different operations. Those could be spare teeth, wiring for braces, and even brace clips!

The second would by the electric industry. Sintering is necessary to manufacture the metal wires we use to conduct electricity. Without wires in general, we wouldn't have a 21 st century, right? Sintering after all, is a process that focuses on improving conductivity.

The third would be the jewelry industry. This specifically applies to gold more than anything else. Gold is gauged by purity levels, and purity in manufacturing must come with sintering. Gold after all is not dug up in big lumps. It is usually excavated in the form of bite-sized nuggets.

The fourth would be the construction industry. Those steel beams that carry the buildings we live in have to be made out of strong material after all. Perfecting the strength and decreasing porosity, is vital to make the steel beams we use last.

Sintering is a process required for all areas of metal manufacturing.

The previous list was simply designed to give you a small idea on the vitality of sintering in our lives. It's not a well-known process, but it is absolutely vital for our age.

And who knows, it could be vital for your business too! So why not call up some vacuum furnace manufacturers and check out the latest deals on furnaces? Sintering furnaces may prove to be a great aid in improving the activity of your enterprises!
About The Author
Webb Vacuum Furnaces designs and builds vacuum furnace systems and controls with the highest quality standards that will fulfill any of its specialized processing needs.

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Why You May Need A Vacuum Sintering Furnace

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Recreation > Travel > Hospitality > Hospitality Industry Posted by webbvacuumfurnaces in Recreation on November 19th, 2016 If you've ever had to work with metals, then you may know about the "process of sintering". Sintering is basically when fine particles of metal are welded together, in order to form a strong non-porous structure, used for a variety of reasons.

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Webbvacuumfurnaces is a top manufacturer of Thermocouple Furnace, Industrial Thermocouple Furnace, Thermocouple Calibration Furnace suppliers.

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The international temperature scale, ITS-90, uses optical pyrometry to establish temperatures above the freezing points of silver, gold, and copper (around 1000° C). For many practical applications, a more direct temperature measurement device is desirable, and to that end high temperature thermocouples have been developed. They are widely available for use in certain conditions to 2000° C, and in some cases, even higher.

Calibration and testing of these thermocouples requires a furnace able to stably maintain extreme temperatures for prolonged periods of time. With few exceptions, simple furnaces designed to operate in air atmospheres are limited to temperatures below 2000° C. Research laboratories engaged in high temperature studies often employ inexpensive ceramic box or tube furnaces using ceramic-metal composite ( cermet) heating elements fabricated from molybdenum or tungsten silicide compositions for use in temperatures from 1600° to 1900° C. However, in most cases, extreme temperature thermocouples are fabricated from refractory metal alloys that require protection from oxidation.

Increasing, temperatures exceeding 2000° C are needed for these studies, as well as a wide variety of other applications. The cold wall furnace design is well suited to attaining and maintaining extreme temperatures above 2000° C. Much of the work done at these extreme temperatures is performed near atmospheric pressure in inert gas rather than in vacuum. This reduces sample and furnace component sublimation. However, the inexpensive rotary vane mechanical vacuum pump often provided on these furnaces provides rapid evacuation of air from the furnace in a few minutes, avoiding lengthy inert gas purge cycles. Initial furnace heating is also done in vacuum to reduce inert gas consumption, which limits inert gas consumption to the higher temperature portions of the heating cycle.

The following figure shows the RD-G, a 2200° C benchtop calibration furnace manufactured by Webb Vacuum Furnaces. It is used in National Standard Laboratories worldwide for the calibration of high temperature thermocouples and melting point standards.

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Thermocouple Calibration Furnace | Vacuum Furnace Calibration

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The international temperature scale, ITS-90, uses optical pyrometry to establish temperatures above the freezing points of silver, gold, and copper (around 1000° C). For many practical applications, a more direct temperature measurement device is desirable, and to that end high temperature thermocouples have been developed.

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High Temperature Vacuum Furnace - Webbvacuumfurnaces

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High Temperature Vacuum Furnace - Webbvacuumfurnaces

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Webbvacuumfurnaces designs and manufactures a absolute line of high-temperature, vacuum and controlled atmosphere furnaces for a large range of applications.

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High Temperature Vacuum Furnace Materials | Webb Vacuum Furnaces

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Webb Vacuum Furnaces manufactures high temperature vacuum furnaces widely used in many applications and well designed to function in a wide range of temperature zones.

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Webbvacuumfurnaces produced annealing furnaces for some of the biggest manufacturers from around the world.

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The majority of the vacuum furnaces manufactured worldwide are used for processing steel alloys, with smaller market segments for nickel, titanium, aluminum and other metallic alloys. Vacuum brazing furnaces make up a significant portion of these furnaces. Various metallurgical heat treatment processes performed at temperatures below 1200 C or so make up the largest portion of this market.

he complexities of the iron-carbide phase diagram creates a wealth of opportunities for modifying metallurgical and physical properties of steel alloys. Annealing is a commonly used process that involves raising the material to an elevated temperature to increase the atomic diffusion rate, curing lattice defects, and improving component ductility.

Steel alloys are the materials most commonly annealed. However, many metallic and ceramic materials can benefit from elevated temperature annealing to relieve internal stresses created by fabrication and forming processes. Vacuum annealing furnaces fall into 2-3 broad categories based on the material being processed. Annealing furnaces for iron and nickel alloys are generally limited to temperatures below 1200° C. Annealing furnaces for ceramic materials more commonly have maximum use temperatures approaching 2000° C. Recently, there has been a third category: annealing furnaces for carbon-based nanotubes with processing temperatures that sometimes exceed 2000° C.

Common annealing atmospheres range from air to inert gasses to reducing gases. They are dependent on the nature of the application and requirements for post-anneal processing and component finishing. The most demanding applications use vacuum annealing that provides clean surface finishes without oxide scale, and require minimal to no post-anneal processing.

The following figure shows the RD-M, a widely used benchtop vacuum annealing furnace manufactured by Webb Vacuum Furnaces. It can be used to process coronary stents and other medical devices.

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Vacuum Annealing Furnace | Webb Vacuum Furnaces

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The majority of the vacuum furnaces manufactured worldwide are used for processing steel alloys, with smaller market segments for nickel, titanium, aluminum and other metallic alloys. Vacuum brazing furnaces make up a significant portion of these furnaces. Various metallurgical heat treatment processes performed at temperatures below 1200 C or so make up the largest portion of this market.

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Vacuum Brazing Furnace For Sale - Webbvacuumfurnaces

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Vacuum Brazing Furnace For Sale - Webbvacuumfurnaces

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Webbvacuumfurnaces manufactures production vacuum and hydrogen furnaces and specialty processing equipment for ceramic-metal brazing and heat treatment requirements.

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While sintering is a process for forming solid objects below their melting point, brazing is a process for joining solid objects below their melting point through use of a separate material that does melt. A common alternative to welding (which requires object melting), brazing is readily adapted to mass production procedures. This is because large numbers of components can be simultaneously joined in one furnace load. Use of a vacuum furnace to prevent metal oxidation allows elimination of the flux used in atmosphere or torch brazing. This improves braze quality, reduces post-braze processing, and increases production yields.

Vacuum brazing is commonly used to join two or more metallic components, but may also be used to join ceramic materials, either to other ceramics or to metals. Since ceramics are not readily wet by most molten metals, brazing to ceramics requires the addition of a highly reactive component to the braze alloy. Often referred to as active metal brazes, these alloys typically contain titanium, or some other highly reactive metal that will bond with the non-metallic atoms in the ceramic (like oxygen, nitrogen, boron, or carbon atoms).

These metals are designated as highly reactive because they readily react with and bond to oxygen and other light elements. Processing these materials at elevated temperatures requires low oxygen partial pressures in the environment to minimize premature bonding of the reactive metal to atmospheric oxygen.

Vacuum brazing furnaces provide the ideal environment for this processing. The addition of a turbomolecular high vacuum pump to a basic rotary vane mechanical pumped vacuum system allows ready attainment and maintenance of 10-4 mbar vacuum levels or lower. This is a seven order of magnitude reduction from 10+3 atmospheric pressure levels. This 99.99999% reduction in oxygen partial pressures is comparable to inert gas with less than 1 ppm impurity levels. While inert gas with these impurity levels can be readily purchased (at considerable cost), outgassing of furnace components, workload, and melting braze alloys inevitably contaminates the furnace environment and reduces gas purity levels. Vacuum brazing furnaces are continually being pumped to removed outgassed constituents, always providing a lower oxygen partial pressure and a superior braze environment. In addition, vacuum gauges used on all vacuum furnaces provide an instantaneous and continuous measurement of total impurity pressure level. They assure constant monitoring and appropriate oxygen partial pressure levels.

The following figure show a cross-section of the RD-M benchtop metallic heat zone turbomolecular pumped vacuum brazing furnace. It is rated to 1200°C, which is widely used for brazing diamonds to tungsten carbide, molybdenum, and steel cutting tools. Diamond brazing is an excellent application for vacuum brazing furnaces. This is because diamond requires very low oxygen partial pressures at elevated temperatures to prevent a phase change conversion from diamond to graphite.

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Vacuum Brazing Furnace | Webb Vacuum Furnaces

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While sintering is a process for forming solid objects below their melting point, brazing is a process for joining solid objects below their melting point through use of a separate material that does melt. A common alternative to welding (which requires object melting), brazing is readily adapted to mass production procedures.

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High Temperature Laboratory Furnace - Webbvacuumfurnaces

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High Temperature Laboratory Furnace - Webbvacuumfurnaces

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Webbvacuumfurnaces offers a huge variety of high temperature laboratory furnace up to 1200° C., useable for all kinds of heat treatment.

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Laboratory Furnace | Webb Vacuum Furnaces

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High quality and high temperature lab furnaces by Webb Vacuum Furnaces . we makes, lab furnaces, sintering furnaces and lot more.

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Select high quality Sintering Furnace products varied in type, usage and fuel from Webbvacuumfurnaces. Sintering is the process of powder metallurgy, where the parts acquire the necessary strength in their applications through proper heat treatment.

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Sintering is a process whereby solid objects are created by heating a mass of small particles to a high temperature that is less than the melting point of the small particle mass. Unlike melting processes, sintering allows the creation of complex shapes that are different from the shape of the containment vessel. In contrast to melting, the lower temperatures allow the use of lower temperature furnaces. Low temperatures prevent chemical interactions that can occur between the containment vessel and any molten material.

For millenia, ceramic materials have been made with sintering processes. Sintering is particularly useful for ceramics for two reasons. First, it is difficult and expensive to reach the high melting point of many oxide ceramics. Secondly, it is impractical to reach the extremely high melting point of covalently bonded non-oxide ceramics, many of which sublime into the gas phase rather than melt into the liquid phase at elevated temperatures and readily achievable pressures.

With the increased importance of non-oxide ceramics in the later half of the twentieth century, vacuum sintering furnaces have been widely used. Cobalt-bonded tungsten carbide, silicon carbide, silicon nitride, boron carbide, and many other carbides, nitrides, and borides are now routinely fabricated in vacuum furnaces. Near net shape sintering of metallic components is also commonly used to reduce machining and overall component costs.

Vacuum sintering furnaces readily provide the non-oxidizing environment and extreme temperatures required by these materials. At the same time, they provide considerable process flexibility by allowing reducing and inert atmospheres, as well as vacuum. Vacuum can be used at lower temperatures during removal of organic binders and lubricants. This is because it effectively volatilizes and removes these materials before they are "cracked" to lower molecular weight constituents. As a result vacuum avoids leaving excess carbon in the material. At higher temperatures, inert gas atmospheres can be introduced to minimize sublimation.

Sublimation can affect both the material being sintered and the material the sintering furnace hot zone is made of. Sublimation of furnace heating elements generally requires backfilling of the furnace with inert gas between 2000°C to 2500°C , depending on choice of heating element material, element construction, element watt density, and longevity desired.

The following figure shows the RD-G, a widely used benchtop vacuum sintering furnace manufactured by Webb Vacuum Furnaces. Operating up to 2000°C in vacuum and 2200°C in argon gas, it consumes less than two kW of power.

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Vacuum Sintering Furnaces | Webb Vacuum Furnaces

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Sintering is a process whereby solid objects are created by heating a mass of small particles to a high temperature that is less than the melting point of the small particle mass. Unlike melting processes, sintering allows the creation of complex shapes that are different from the shape of the containment vessel.

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