With our COD pressure sintering systems, you can achieve top cemented carbide quality over and over again. The systems combine two technologies in one machine: Vacuum sintering and hot isostatic pressing of sintered parts.
In addition to the standard pressure ratings of 60 bar and 100 bar, pressure sintering systems with process pressure of 200 bar are available for extremely low-cobalt types of cemented carbide. There is also a special high-temperature version of our pressure sintering systems available, and it is perfect for manufacturing silicon nitride ceramics.
Largely standardized and cost-optimized SSH pressure sintering systems are available for basic applications.
These systems can be used for sintering at high gas pressures, which means that the sintered parts can be isostatically redensified. Their most striking feature is therefore the heavy-duty design of the bayonet vessel fittings.
COD pressure sintering systems are cold-wall furnaces with pressure ratings of 60, 100, and 200 bar, with insulation cylinders made of graphite felt and graphite resistance heating elements. They are usually installed horizontally, which makes them easier to load and maintain and limits what is required of the installation sites. COD systems usually feature equipment for dewaxing powder pressed parts, consisting primarily of a graphite bushing to protect the furnace installations from the effects of steam and a condenser in which the pressing additives can be collected and from which they can be drained in a liquid state once the process is complete.
Depending on the size of the furnace in question (from laboratory size to mass production), the systems feature between two and six temperature-control zones, which ensures outstanding temperature uniformity even in the largest systems. Effective rapid cooling systems make for extremely short production times. System operating costs are notably low since the structure and material of the thermal isolation are effective and long-lasting, while gas consumption is minimal thanks to there being very little dead space. Having been put through their paces in well over 200 pressure sintering systems, COD pressure sintering systems feature particularly well developed and reliable control technology. Furthermore, the systems are rigorously tested (including heat testing) prior to delivery and their safety functions inspected by TÜV, a testing organization.
PVA vacuum and pressure sintering systems are generally equipped with debinding apparatus that can be used to remove pressing additives cleanly and uniformly from the carbide parts before the parts are exposed to the high temperatures involved in sintering. The debinding technology is adapted to the pressing additives used, while the processes are conducted at positive or negative pressure, with inert gases, or in hydrogen atmospheres. In some cases, the parts are treated with reactive gases in the pre-sintering phase to increase the proportion of carbon in the parts or their barrier layers, for example.
Our systems require only very short process times thanks to their highly effective cooling systems. This is very much appreciated by our customers since it means that they can adapt their furnace processes precisely to fit production shifts.