What To Expect From A Quality Vacuum Furnace

Processes such as heat treatment of steel alloys are best carried out with the help of a vacuum furnace

. These furnaces can heat different types of materials to very high levels in a vacuum. Sometimes, a vacuum might be needed to eliminate the presence of other gases and prevent contamination during the heat treating process. This process is known for a high level of consistency, and is the preferred source for processes including but not limited to brazing, sintering and heat treating.

Since different customers have varying requirements, these furnaces can be bought in standard varieties or as a custom furnace. Getting a furnace customized helps one get exacting specifications with relation to temperatures and vacuum atmospheres. These furnaces are capable of heating materials to very high levels up to as much as 3000 degrees centigrade. The desired pressure gas atmospheres can also be achieved. A number of high temperature furnaces can be made with graphite hot zones for impeccable performance in various heat treating processes.

There are several advantages offered by a vacuum furnace. For instance, they are known to produce highly uniform and evenly spread temperatures in the range of 1000 to 1500 degree centigrade. Besides, even if it is a small area, the temperatures can be easily managed to suit specific requirements. Owing to a vacuum environment, the presence of carbon, oxygen and several other gases is eliminated. This means that the product is subjected to low or negligible contamination. In addition, the product can be easily and quickly cooled once the heat treating process is completed.

While investing in such a furnace, it is important to check if your manufacturer adheres to industry codes such as ASME. Moreover, it is essential to ask the manufacturer to offer you a set guarantee or warranty period. The warranty usually covers the chamber and not the entire apparatus, but this factor could change from firm to firm. It is critical to check if the furnace is being fabricated by certified welders who have enough experience.

In most cases, your furnace may be fabricated either from mild steel, 304 stainless steel or 316 stainless steel. You can expect a well-made vacuum chamber of a furnace to have a leak rate of 5 microns per hour. In cases where zero leak rates are called for, changes can be made accordingly by applying specialty coatings or through electropolishing. A custom furnace can be made according to exacting specifications.

In fact, applications that need the integration of processes such as sintering and de-binding would certainly stand to benefit from customization. For instance, your manufacturer could add a condenser system or a hydrogen burn off system to your existing vacuum furnace if you so desire.

by: Mark Kelvin

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