Industrial multi zone rotary furnace for burning metal powder

The industrial multi temperature zone rotary furnace can effectively sinter metal powder. Through dynamic heating, independent temperature control in multiple temperature zones, and atmosphere regulation technology, it can meet the core requirements of temperature uniformity, atmosphere control, and continuous production for metal powder sintering. The specific analysis is as follows:

1. The core requirements for metal powder sintering and the adaptability of rotary furnaces
temperature uniformity
Metal powder sintering should avoid local overheating or undercooking, otherwise it may lead to abnormal grain growth or insufficient bonding. The rotary furnace can achieve temperature field uniformity within ± 5 ℃ through dynamic rotation (continuous rolling of materials) and segmented temperature control, which is much better than the ± 10 ℃ deviation of static furnaces (such as box furnaces). For example, in the sintering of stainless steel powder (316L), the dynamic heating of the rotary furnace promotes uniform diffusion and bonding between powder particles, resulting in high density and reduced corrosion rate compared to castings.
Atmosphere control
Many metal powders (such as iron, nickel, cobalt based alloys) require inert gas (N ₂, Ar) protection during sintering to prevent oxidation, or reducing gas (H ₂) to reduce impurities. The rotary furnace can be equipped with multiple gas pipelines to achieve zone atmosphere control. For example, the front section is filled with H ₂ reduced iron oxide powder, the middle section is switched to N ₂ to prevent re oxidation, and the rear section is naturally cooled to ensure no oxidation pollution during the sintering process.
Continuous production capacity
Metal powder sintering often requires large-scale production, and the continuous feed discharge design of rotary furnaces (such as spiral propulsion or gravity feeding) can achieve 24-hour uninterrupted production, far exceeding the batch capacity of intermittent furnaces.

2. Typical Application Cases of Metal Powder Sintering
Hard alloy (WC Co) sintering
After mixing cobalt powder with tungsten carbide powder, sintering is carried out at 1400-1450 ℃ in an H ₂ reducing atmosphere. The rotary furnace uniformly infiltrates tungsten carbide particles with cobalt solution through dynamic heating, forming a dense structure with high hardness and bending strength. Multi temperature zone temperature control (such as preheating section at 400 ℃ and constant temperature section at 1420 ℃± 5 ℃) can avoid grain coarsening and improve material properties.
Stainless steel powder (316L) sintering
Sintering at 1250-1300 ℃ in a N ₂ protective atmosphere, the rotating motion of the rotary furnace promotes diffusion and bonding between powder particles, resulting in high density and better corrosion resistance than castings. Multi temperature zone design (such as a heating section of 800 ℃/h and a constant temperature section of 1280 ℃± 5 ℃) can optimize grain growth and improve material toughness.
Titanium alloy powder sintering
The titanium alloy powder (such as Ti6Al4V) used for 3D printing needs to be sintered at 1200-1300 ℃ in an Ar atmosphere. The dynamic heating of the rotary furnace can eliminate powder agglomeration, form a uniform fine crystal structure, have high tensile strength and elongation, and meet aerospace standards.

3. Technological advantages support metal powder sintering
Dynamic heating uniformity
The materials continue to roll inside the furnace, eliminating the “dead corners” problem of static furnaces and ensuring that all powder particles are heated uniformly. For example, in the sintering of alumina ceramics, dynamic heating can reduce the standard deviation of grain size and significantly improve material properties.
Flexible regulation in multiple temperature zones
Different temperature zones (such as preheating section, reaction section, cooling section) can be set according to the characteristics of metal powder to achieve complex temperature curves. For example, in the sintering of hard alloys, the first stage is degreased at low temperature (800 ℃), the middle stage is sintered at high temperature (1400 ℃), and the second stage is rapidly cooled (≤ 50 ℃/min) to prevent grain growth.
Atmosphere zoning control
Support the zoning design of restoring atmosphere in the front section, inert atmosphere in the middle section, and cooling atmosphere in the back section to meet the full process requirements of metal powder sintering. For example, in stainless steel powder sintering, the front section is reduced with iron oxide by H ₂, the middle section is cut with N ₂ to prevent decarburization, and the rear section is naturally cooled.