Webb Vacuum Furnaces
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. Webb vacuum furnaces offers two high temperature furnaces for a wide variety of applications.
Why You May Need A Vacuum Sintering Furnace. Posted by webbvacuumfurnaces in Other 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. Thermocouple Calibration Furnace Manufacturers - Webbvacuumfurnaces. 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. High Temperature Vacuum Furnace - Webbvacuumfurnaces. After the Second World War, there were rapid advances in the commercialization of advanced technologies.
Before that, widespread use of high temperature furnaces approaching and exceeding 2000° C was limited to a few applications such as graphitization and abrasive manufacture. To a large extent, early high temperature furnaces were made with available alumina silicate refractories. These were initially bricks and refractory mortar, and more recently fibrous refractory board of similar compositions. Variations of these oxide ceramics had been used since ancient times and are the foundation of ceramic technology. With a few notable exceptions (such as the toxic beryllium oxide and the radioactive thorium oxide), commonly available oxide ceramics have melting points below 2000° C, making them unsuitable for structural applications at these temperatures.
Annealing Furnace Manufacturer - Webbvacuumfurnaces. 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. The 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. Common annealing atmospheres range from air to inert gasses to reducing gases. The following figure shows the RD-M, a widely used benchtop vacuum annealing furnace manufactured by Webb Vacuum Furnaces. Vacuum Brazing Furnace For Sale - Webbvacuumfurnaces. 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.
These metals are designated as highly reactive because they readily react with and bond to oxygen and other light elements. Vacuum brazing furnaces provide the ideal environment for this processing. High Temperature Laboratory Furnace - Webbvacuumfurnaces. The common tube and box furnaces seen in laboratories worldwide are not only inexpensive, but they work well for many high-temperature processing applications.
However, the least expensive versions have Kanthal A1 or nickel alloy heating elements that limit practical long-term application temperatures to about 1200° C. Moderately priced super Kanthal cermet heating elements and more robust insulation packs yield designs suitable for maximum temperatures in the 1600°C to 1800°C range in oxidizing atmospheres. Ceramic tubes can extend application of these laboratory furnace to inert and vacuum atmospheres, although with some reliability issues. An ideal general-purpose laboratory furnace would extend the above temperature range to permit processing of more covalently bonded non-oxide materials and refractory metals. Both of these materials are now used widely in commercial applications. Cold wall designs enable fabrication of these ideal laboratory furnaces. Sintering Furnaces by Webbvacuumfurnaces. 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. Best Vacuum Furnace System Manufacturers - Webbvacuumfurnaces.