Selection by treatment
The best furnace for your treatment
Hardening is the main treatment process performed on all types of steel; for the best results, it is important for the furnace to be very uniform during heating, and the charge must be cooled very quickly to achieve the structural transformations required in the treated materials.
Braze welding requires particularly careful control of the working conditions, in terms of a clean environment and uniformity and level of the vacuum; these conditions are vital for productivity and above all for excellent quality brazing. The improvement and technological evolution processes being developed all the time have allowed the achievement of excellent results.
BRAZING OF DIAMONDS OR INSERTS FOR SPECIAL TOOLS
There has been a strong drive towards the introduction of innovative solutions for the brazing of diamond onto hard metal or inserts for special tools during the last few years, due to the growing demands from the market for more and more sophisticated products. Vacuum brazing in a quality furnace allows excellent results to be achieved from the very first cycles.
In the heat treatment sector, the aluminium brazing process is used for the production of components for both civil engineering and the automotive industry. This treatment requires specific furnaces with a high vacuum, which must be maintained throughout the heating and cooling cycle, and excellent temperature uniformity, for the best results. Therefore, even though particularly high temperatures are not needed, special care must be taken over both the construction of the furnace and its working conditions and the relative process control. HTS furnaces built specifically for these treatments have metal chambers and new-design heating elements, created to guarantee excellent irradiation and no deformation. The vacuum brazing of aluminium components is becoming a more and more popular procedure. As well as for the construction of plate-type or honeycomb heat exchangers, it is increasingly also used for the production of some strategic parts in the aviation and space industries. This technology offers considerable benefits in terms of the quality of the treatment results, provided the furnace’s characteristics comply with clearly defined quality and performance parameters. It is therefore important to use materials with a low level of outgassing for construction of the internal parts, appropriately rated vacuum pump units and excellent uniformity inside the chamber, all conditions guaranteed in all HTS furnaces.
Use of a specific furnace is to be recommended for tempering treatments and for medium-temperature processes. This furnace, combined with the hardening furnace, is able to optimise the treatment processes and complete the set of furnaces required for a good heat treatment department. The furnaces available for these treatments are of three types:
Cold wall tempering furnaces are the type most in demand, built to meet the needs of medium-low temperature heat and surface treatments; the uniformity of temperature guaranteed even at low temperatures enables them to comply perfectly with the required specifications, especially in the most strategic industries, where the reference standards enforce conformity with very strict, precise parameters.
Hot wall tempering furnaces offer the major benefit of an extremely clean treatment environment, since the chamber does not contain any interfering factor which could cause contamination of pieces during the various heat treatment phases. These furnaces are built for all medium-temperature treatments, including stabilising and stress relieving treatments. Heating takes place in a pressurised inert gas environment for better irradiation and more uniform temperature. Hot wall furnaces can also be equipped with the nitriding package.
Ceramic chamber tempering furnaces allow vacuum tempering to be performed in scalable conditions in terms of operating temperature and cooling speed, optimising the investment in relation to the working conditions required and financial considerations; this furnace is built with a simplified basic structure with scalable cooling solutions, and the ceramic insulation and special alloy resistors allow treatment cycles to be performed at higher temperatures than in other tempering furnaces, making a wide range of heat treatments possible.
Sintering is the production of metals from fine powders; it is used to produce materials with geometrical forms and properties which could not be achieved with other techniques such as casting or forging. Sintering produces metal components starting from small solid particles (“powders”) which are welded together as the temperature increases.
Sintering processes may require widely differing working conditions in terms of degree of vacuum, pressure, temperature and cycle duration; the HTS furnaces for this application are developed, designed and built to comply perfectly with the needs of the user’s intended process.
Many strategic components of the hot parts of gas turbines or aviation engines require special treatments such as protective coatings, or reconditioning and regeneration treatments. Some of these processes are periodically performed on the used components themselves, which require overhaul or repair during turbine or engine maintenance. The more strategic the parts for treatment, the more care and quality are required in the heat treatment processes, and the use of reliable furnaces with the right performance parameters is a major factor. Here again, HTS furnaces deliver excellent quality of treatment and high productivity in these applications.