Powder metallurgy parts, with their near-net-shape forming and high material utilization, are widely used in automobiles, machinery, home appliances, and medical devices. However, their unique microstructure and surface characteristics necessitate targeted care measures during daily use and maintenance to ensure stable performance, extended service life, and maintained safety and reliability.
The primary principle of daily care is to prevent physical damage and chemical corrosion from the external environment. Powder metallurgy products typically possess a certain degree of internal porosity. While a well-designed pore structure can provide functions such as weight reduction, shock absorption, or oil storage, it also makes them more susceptible to damage from liquid penetration, dust intrusion, or corrosive media. Therefore, during assembly and use, collisions with hard objects and excessive impacts should be avoided to prevent the initiation and propagation of microcracks. Exposed surfaces can be appropriately protected, such as by spraying an anti-rust layer or applying a corrosion-resistant coating, to reduce the corrosive effects of environmental moisture and harmful media.
Cleaning and maintenance are crucial aspects of daily care. For parts without obvious sealed pores or those that have undergone immersion treatment, use a neutral detergent and soft tools to remove surface oil and dust. Avoid using strong acids, strong alkalis, or chlorine-containing solvents, as these may damage the surface passivation film or penetrate the pores, causing internal corrosion. During cleaning, carefully control water pressure and temperature to prevent thermal stress and surface peeling caused by temperature differences or mechanical erosion. For porous structural parts with oil storage functions, prolonged immersion cleaning is not recommended to prevent oil loss and alteration of the original lubrication characteristics.
Lubrication management is particularly critical for moving powder metallurgy parts. Many powder metallurgy gears, bearings, and connecting rods rely on pore oil storage for self-lubrication during operation. Regularly check and replenish appropriate lubricating oil or grease according to operating conditions to prevent insufficient lubrication from accelerating wear. When changing lubricants, thoroughly remove any old oil residue to prevent chemical reactions or viscosity incompatibility caused by mixing different oils. For high-load or high-speed rotating parts, shorten the lubrication cycle and monitor temperature rise to promptly identify abnormal wear signs.
Storage and protection are equally important. Unassembled or spare parts should be stored in a dry, ventilated, and light-protected environment, using moisture-proof and dust-proof packaging. For easily oxidized materials (such as alloys containing aluminum, magnesium, and titanium), desiccants can be placed inside the packaging or vacuum or inert gas sealing can be used to inhibit surface oxidation and performance degradation. Before long-term storage, surface inspection and necessary protective treatment should be performed, and storage with acidic or alkaline substances should be avoided.
Monitoring during operation and periodic maintenance are extensions of maintenance. Vibration analysis, noise detection, and temperature rise monitoring can promptly detect abnormal conditions caused by wear, loosening, or lubrication failure, preventing the escalation of faults. During maintenance, the structural characteristics and usage history of the parts should be considered to assess pore blockage, surface corrosion, and dimensional changes, and repair or replacement should be carried out according to standards.
In summary, daily maintenance of powder metallurgy parts encompasses protection, cleaning, lubrication, storage, and operational monitoring, requiring differentiated plans based on their material, structure, and operating conditions. Scientific and standardized maintenance can not only maintain the good performance of components, but also effectively reduce the risk of sudden failures and improve the overall reliability and economy of equipment operation.