powder metal microwave sintering furnace
application of powder metal microwave sintering furnace
The powder metal microwave sintering furnace can be used for the powdered metal microwave microwave sintering,ceramic sintering ,hard metal sintering,chemical material microwave drying and sintering
Everyday metallic objects can now be made stronger, harder and longer-lasting thanks to a new process being developed that uses microwaves to sinter together powdered metals to form hard-wearing components ranging from small cylinders to automotive parts.
Simulation of Microwave Sintering
Microwave sintering is a promising technique for the densification of fine-grained ceramics and hard metals. The advantage compared to conventional heating is that heat is generated in the bulk of the specimen, so that higher heating rates are possible without excessive temperature gradients. Higher heating rates usually favor densification compared to grain coarsening, so that high densities can be achieved with a fine grain structure.
On the other hand, ceramic materials usually have a microwave absorption coefficient that increases strongly with temperature, which may cause runaway instabilities: a spot which is slightly hotter than its vicinity absorbs more energy, so that the difference is enhanced. Heat conduction, on the other hand, tends to spread the localized heat, and thus stabilizes homogeneous sintering.
By modeling microwave sintering runaway instabilities can be predicted and process parameters leading to a homogeneously sintered product with a uniform, fine grain structure can be found
Microwave Conventional Heating
The use of microwave energy for materials processing has major potential and real advantages over conventional heating. These include:
· Time and energy savings
· Rapid heating rates
· Considerably reduced processing time and temperature
· Fine microstructures and hence improved mechanical properties and better product performance
· Lower environmental impact.
Which Metals can be Microwave Sintered?
Until recently, microwave heating has been applied to sinter only oxide ceramics and semi-metals like carbides and nitrides. However, our research reveals that in powdered form, virtually all metals, alloys, and intermetallics will couple and heat efficiently and effectively in a microwave field, and their green parts will produce highly sintered bodies with improved mechanical properties. For example, in our exploratory experiments we tried two common commercial steel compositions, namely Fe-Ni-C (FN208) and Fe-Cu-C (FC208). These formed highly sintered bodies in a total cycle time of about 90 min at temperature range of 1100-1300°C with a soaking time of 5-30 min in forming gas (a mixture of N2 and H2) atmosphere. Mechanical properties such as the modulus of rupture (MOR) and hardness of microwave processed samples were significantly higher than the conventional samples - in the case of FN208; the MOR was 60% higher. The densities of microwave processed samples were close to the theoretical densities, and the net shape of the green body was preserved without significant dimensional changes.
Which Metals has been Microwave Sintered?
Many commercial powder-metal components of various alloy compositions, including iron and steel, copper, aluminum, nickel, molybdenum, cobalt, tungsten, tungsten carbide, tin, and their alloys have been sintered using microwaves, producing essentially fully dense bodies.
Detailed product description
Our typical microwave sintering furnaces
Operate at a 2.45GHz frequency with power
Output in the range of 1-2 KW.
- Great energy efficiency
- Faster sample heating
- Improved material properties
- Emission reduction
- Wide range of potential applications
the sintering chamber consists of ceramic
Insulation housing (batch system).
The primary function of the insulation is to preserve the heat generated in the work piece.
The temperatures are monitored by optical sheathed thermocouples placed close to the
Surface of the sample.
The system is equipped with stainless steel
Housing including max. Temp.1, 600 deg. C,
Air circulation, glass door available and
Programmable controller with max.10
Program steps, control output indicator and
Exhaust device as well.
There are three models for applications of
Ceramic materials, other industrial needs.