Vacuum Carburizing System
Since 1915, Surface Combustion has focused on applying our vast technical and practical experience thereby providing customers equipment solutions that are rugged and experience extended production. Additionally, Surface remains highly dedicated to the pursuit of new technology through extensive research efforts and maintaining our industry leading service and support capibility.
Vacuum Carburizing System
Surface Combustion has multiple commercially installed vacuum carburizing systems, which demonstrate the ultimate in flexibility for heat-treating. The systems utilize a unique arrangement of separate and isolated chambers to perform concurrent heat-treating processes. This includes all traditional vacuum heat-treating processes such as hardening, annealing, brazing as well as low pressure vacuum carburizing. Once thermal processing is complete, loads can be oil quenched, high-pressure gas quenched, or slow cooled.
During processing, each vacuum process is isolated from other vacuum chambers through the use of tight sealing inner doors. This approach allows one or more chambers to be boost carburizing at 10 torr while other chambers are at hard vacuum levels. Likewise, equalize processing at lower temperatures can be easily accomplished. Partial pressures processing with different gases such as nitrogen, argon, or hydrogen are also easily possible independently in each chamber. The tight sealing vacuum doors even allow preventative maintenance or inspections to be carried out on any chamber while the main system still remains in production. Carburizing chambers can be equipped with either electric heating systems as well as the patented Surface gas fired vacuum technology. Both electric and gas fired formats have no conventional electrical insulators/ isolators exposed to the carburizing atmosphere. This means the system is not subject to the short circuiting of insulators due to carbon drop out that can occur in conventional electrical heating technologies.
The multiple chamber batch approach allows captive heat treaters to operate at high levels of production. Likewise, for commercial heat treaters, the flexibility of the system allows handling a wide array of different process requirements. Unmatched flexibility in quenching allows low alloy materials to be oil quenched, with higher alloy materials being gas quenched at pressures up to 20 bar. Conventional vacuum hardening or annealing grades are also easily processed at lower gas quench pressures and / or reduced fan speeds for materials simply requiring air cooling or conventional 2 to 6 bar cooling rates.
Iff a higher temperature "through hardening" cycle is required, this can be performed in a separate chamber which has not been exposed to carburizing to preserve the integrity of critical work pieces.