Welcome to Midwest Thermal-Vac, Inc.
Founded in 1999 by Fred Otto, MTV has become a leader in vacuum carburizing and heat treating for the Aerospace, Motor Sports, and Commercial Industries with multiple quenching to handle just about any commercial material.
By achiving ISO
9001 and AS9100 registrations Midwest Thermal-Vac,
Inc. has taken considerable measures to not only maintain
it’s Industry leading status, but exceed it. While this may
be good enough for some heat treating facilities, Midwest Thermal-Vac
has successfully achieved Nadcap accreditation to
show that our pyrometry procedures are controlled, consistent and
repeatable enough to meet the highest standards and tolerances within
the aerospace community.
Low-pressure carburizing Since being developed in the late 1960's, much progress and many improvements have been made. Modern technologies and recent advancements in low-pressure carburizing (LPC) within the last fifteen years have made many companies throughout the industry realize the many proven benefits of LPC, primarily it's capability of precise process control, can no longer be ignored. Tight control enables absolute repeatability, optimized part microstructure, enhanced mechanical properties, and reduced manufacturing costs.
While some heat treat companies have just begun realizing the benefits and have begun offering LPC services, Midwest Thermal-Vac has been vacuum carburizing since 1999 and continues to be an industry leader.
Vacuum Carburizing Technology
Demand for vacuum carburizing systems equipped with high-pressure gas quenching, oil quenching, or both has quadrupled since 2000, as the technology has replaced atmosphere carburizing and traditional oil quenching in many cases. New advances in vacuum furnace technology help integrate heat treating equipment on the shop floor and into the production flow of the manufacturing process.
Temperature uniformity is critical for vacuum carburizing, especially in the low-temperature ranges, and a maximum spread of ±10°F (±5.5°C) is required to maintain tight case depth control throughout the load. This is equally important for vacuum carbonitriding cycles, which are run as low as 1425°F (775°C). Highly loaded gears and shafts, such as those in off-road vehicles under extreme race conditions, require fracture toughness values two or three times those of conventional vehicles. Tightly controlled low-pressure vacuum carburizing processes deliver these high-performance values.
Hardness: The new materials require better control of hardness and carbon distribution (case/core hardness, surface/near surface), optimized microstructures, and control of such factors as retained austenite, carbide size (type and distribution), and non-martensitic phases. Property control is also critical, especially for characteristics such as residual stress patterns and surface finish, and mechanical properties such as toughness, impact strength, and wear resistance. Improved performance demands in aircraft and rotorcraft not only are pushing the development of advanced materials, but also are driving prime contractors and their suppliers to low pressure vacuum carburizing.
Typical commercial and military aircraft
applications of low-pressure
vacuum carburizing include braking
systems, actuator systems, flight controls
and guidance systems, hydraulic
power plants, landing gearboxes,
and components such as
bearings, ball screws and nuts, planetary
gears, pinions, and shafts.
To improve part performance
throughout the industry, commercial heat treaters are beginning to share
their knowledge with respect to successes
and lessons learned.