Sintering Metal Planetary Gear

The advantages of sintering metal planetary gears

1.High load-bearing capacity: After quenching, surface quenching, or carburizing quenching to increase hardness, it can withstand large loads.
2.Good self-lubricating performance: Utilizing the porosity of the sintered body, immerse it in 10% -40% (volume fraction) lubricating oil and use it in a self supplied state. During operation, the temperature of the liner increases. Due to the larger expansion coefficient of oil compared to metal, the oil automatically enters the lubricating surface to lubricate the liner. Adding oil once can last for a long time, making it suitable for situations where refueling is inconvenient.
3.Low manufacturing cost: Powder metallurgy technology can effectively reduce production costs during large-scale production.
4.Good transmission characteristics: The main features of planetary gear transmission are small size, high load-bearing capacity, and smooth operation. Some types have high efficiency and can achieve functions such as deceleration transmission with large transmission ratios, high-power transmission with compact structures, and synthesis and decomposition of motion.

What are the specific effects of different alloy powders on gear performance?

1. Iron based alloy powder
• Applicable scenarios: cost sensitive, low to medium load gears (such as household appliances, general industrial equipment).
• Performance impact:
• Advantages: Low raw material cost, density can be increased through warm pressing/re pressing process (reducing porosity by more than 15%), and adding copper (Cu) and nickel (Ni) elements can enhance toughness.
• Limitations: Poor high-temperature oxidation resistance, prone to cracking under high loads; Need to rely on surface quenching and tempering treatment to improve tooth surface hardness (HRC 55-60).
• Optimization direction: Adding rare earth elements to improve corrosion resistance, and composite carbides (such as WC) to enhance wear resistance.

2. Nickel based alloy powder
• Applicable scenarios: high corrosion environments (chemical equipment), gears with frequent impact loads.
• Performance impact:
• Advantages: Excellent natural corrosion resistance and outstanding high-temperature self-lubricating properties (≤ 800 ℃); Adding boron (B) and silicon (Si) can form a low melting point melt pool and enhance the bonding strength of the cladding layer.
• Limitations: The cost is relatively high (about twice that of iron-based materials), and the risk of brittleness under high hardness needs to be regulated through heat treatment.
• Typical formula: Ni-Cr-B-Si system, with a surface carburized hardness of up to HRC 62.

3. Cobalt based alloy powder
• Applicable scenarios: Extreme high temperatures (≥ 900 ℃), high wear environments (aircraft engines, turbine reducers).
• Performance impact:
• Advantages: Best high-temperature strength/oxidation resistance, excellent heat fatigue resistance; Wettability is superior to iron-based materials, making it suitable for composite ceramic particles (such as TiC) to enhance wear resistance.
• Limitations: Expensive (about 5 times that of iron-based materials), limited to high-end applications.

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