Transformation of UT Sintering Furnace and ALD Sintering Furnace and Analysis of Structural Difference
No.
Item point
Differences in structure between UT and ALD sintering furnaces
Advantages and disadvantages analysis
1
Heater layout
UT heaters bonded together to form a square (four weeks) layout
ALD heaters are threaded by 12 heaters to form a semicircular layout
According to the principles of thermodynamics and dynamics, the ALD heater layout is more scientific and more reasonable. At present, the sintering temperature of the UT sintering furnace is lower in the upper layer and the lower layer, and the ALD sintering furnace is just the opposite. The upper layer in the lower layer is lower, and the temperature uniformity is better.
2
Temperature control method
The UT three zones are independent of each other. Any temperature difference in any one zone during the heating process will be too large. The other two zones will not compensate for the collaboration. Instead, they will work independently. When the zone is maintained, the other two zones will remain waiting.
The three areas of ALD are linked to each other and the temperature difference in one area during the heating process is too large. The other two areas will cooperate to compensate and reach equilibrium.
ALD sintering furnace temperature control method than UT furnace science. UT sintering furnace often appear in the program to maintain a certain relationship with the temperature control method, after the company's technical staff to adjust, improve (increase the program to maintain the temperature difference, reduce the program temperature rate, electrical components, improvements), later greatly improved, It is relatively normal at present.
3
Dewaxing
UT sintering furnace hydrogen dewaxing, furnace and dewaxing instrument pressure the same, H2 dewaxing, the wax vapor attached to the furnace wall condenses into a liquid into the wax channel into the wax tank.
ALD sintering furnace hydrogen pressure difference dewaxing, furnace pressure is higher than the dewaxing pressure, H2 dewaxing, the pressure difference makes H2 and wax steam from the furnace into the dewaxing pipeline, paraffin condensation in the wax tank, H2 is burned.
The UT dewaxing time is short, the removal is not clean, and paraffin wax is left on the furnace wall and furnace door, resulting in a higher UT carbon potential relative to ALD.
ALD dewaxing for a long time, clean, furnace wall, furnace door will not have residual paraffin, ALD carbon potential relative to UT is low.
4
Positive carbon method
UT uses positive pressure carbon; ALD uses negative pressure carbon.
UT positive carbon effect is good, ALD positive carbon effect is not ideal