How to select vacuum furnace products?
The selection of the vacuum furnace mainly involves the pumping speed of the vacuum pump and the selection of the material of the heating chamber. The most suitable product equipment can be selected by comprehensively considering the use range of the product vacuum, the material processing temperature and other factors.
1. Vacuum Selection
The working vacuum degree should be selected according to the material and the heating temperature. First, the working vacuum degree required by non-oxidizing heating must be met, and then the surface brightness, degassing, and alloy element evaporation should be considered comprehensively. The recommended working vacuum degree for common material vacuum treatment is as follows:
|
Vacuum heat treatment |
Recommended working vacuum |
Vacuum brazing |
Recommended working vacuum |
|
Steel |
1-10-1 Pa |
Aluminum products |
10-3Pa |
|
Stainless steel, high temperature alloy |
10-2 -10-3 Pa |
Copper base products |
10-1 -10-2 Pa |
|
Titanium alloy |
10-3Pa |
Nickel-based products |
10-2 -10-3 Pa |
Copper alloy | 133-13.3 Pa | Multicomponent alloy product | 10-1 -10-3Pa |
2. Selection of heating and thermal insulation materials
The equipment can choose different heating elements and heat insulation layers according to different operating temperatures. The commonly used heating element materials are heat-resistant steel (Cr20Ni80), high-purity graphite, molybdenum and alloys, tungsten and alloys, etc. The temperature range is as follows. In addition to the selection of the above materials, it is necessary to comprehensively consider the energy consumption and stability under long-term use.
|
Operation Temperature |
Heating element selection |
Insulation layer selection |
|
850℃ and below |
Heat resistant steel |
Heat resistant steel + Stainless steel |
|
850℃-1100℃ |
Molybdenum metal or heat resistant steel |
Molybdenum metal + Stainless steel Molybdenum metal + graphite felt |
|
1100℃-1300℃ |
Molybdenum-lanthanum alloy |
Molybdenum-lanthanum alloy + Stainless steel |
High purity graphite | Graphite soft felt +Graphite hard felt | |
1300℃-1600℃ | Isostatic graphite | Graphite soft felt +Graphite hard felt |
Tungsten alloy | Tungsten alloy+Molybdenum-lanthanum alloy + Stainless steel | |
1600℃-2100℃ | Isostatic graphite | Graphite soft felt +Graphite hard felt |
Tantalum | Tantalum+Molybdenum-lanthanum alloy + Stainless steel |
3. Meaning of equipment model
J: The first letter of the company's English name V：The first letter of vacuum
|
Furnace Type |
Examples |
Meaning |
|
JVOQ series double-chamber oil quenching vacuum furnace |
JVOQ966M Molybdenum heating chamber double-chamber oil quenching vacuum furnace |
OQ: Oil quenching abbreviations 966: Effective zone size M: Molybdenum heating chamber |
|
JVGQ series high pressure gas quenching vacuum furnace |
JVGQ2-966M-10bar 10bar Molybdenum heating double-chamber high-pressure gas quenching furnace |
GQ:Gas quenching abbreviations 966: Effective zone size M:Molybdenum heating chamber 10bar:Gas quenching pressure |
JVAF series annealing vacuum furnace | JVAF966 | AF:annealing furnace abbreviations 966:Effective zone size |
JVTF series tempering vacuum furnace | JVTF966 | TF:tempering furnace abbreviations 966:Effective zone size |
JVAB series aluminium brazing vacuum furnace | JVAB3511 | AB:Aluminium brazing abbreviations 3511:Effective zone size |
JVHB series high temperature brazing vacuum furnace | JVHB966 | HB:High temperature brazing abbreviations 966:Effective zone size |
JVDB series diffusion bonding vacuum furnace | JVDB966 | DB: diffusion bonding abbreviations 966:Effective zone size |
JVSF series sintering vacuum furnace | JVSF966 | SF: Sintering furnace abbreviations 966:Effective zone size |
JVLF series laboratory vacuum furnace | JVLF211 | LF:Laboratory furnace abbreviations 211:Effective zone size |
Note: Vertical vacuum furnace add V (Vertical) after the above model letters.