Powder Metallurgy
01
Powder Metallurgy Metal Powder Complex Shape Parts
Product introduction
This product is made by pressing metal powder into shape and sintering it at high temperatures. The process has the advantages of high material utilization, the ability to produce complex-shaped parts and excellent mechanical properties. It is widely used in automotive, aerospace, medical device and tool manufacturing and other fields.
Production technology
1. Preparation of metal powder
①Reduction method, use reducing agents to reduce metal oxides into metal powder; ②electrolysis method, obtain pure metal powder by electrolysis of metal-containing salt solutions; ③atomization method, spray molten metal into fine particles through high-pressure air flow or liquid flow, and then cools and solidifies into metal powder.
2. Mix powder
Different types of metal powders are mixed in specific proportions to obtain the desired alloy composition and properties.
Lubricant is added during the mixing process to reduce friction during subsequent compression molding and improve molding quality.
3. Press molding
①Uniaxial pressing, apply pressure to the powder through the upper and lower molds, suitable for parts with simple shapes; ②Isostatic pressing, put the powder into a flexible mold, apply pressure evenly through all directions, suitable for the preparation of complex shapes and high-density parts; ③Injection Molding, mix the mixed powder with a binder and inject it into a mold for molding. It is suitable for producing small parts with complex shapes.
4. Sintering
The pressed blank is sintered at high temperatures (usually below the melting point of the metal), and diffusion and recrystallization occur between the powder particles to form a dense metallurgical structure. Sintered parts usually have higher strength and hardness.
5. Post-processing
①Heat treatment, including annealing, quenching, tempering and other processes, used to adjust the internal structure and performance of parts. For example, annealing can eliminate internal stress, and quenching can improve hardness and strength; ②mechanical processing, such as turning, milling, grinding, etc., used to achieve the final size and surface accuracy of parts; ③surface treatment, such as electroplating, spraying, oxidation, etc., used to improve the surface properties of parts, such as corrosion resistance, wear resistance and appearance quality.
Product design
Choose the appropriate molding process, such as compression molding (cold pressing, hot pressing), injection molding or isostatic pressing. Consider parameters such as molding pressure, temperature and time, as well as the design and material selection of the mold.
The dimensional accuracy of powder metallurgy products is usually high, and dimensional changes during the molding and sintering processes need to be strictly controlled, taking into account allowances and corrections for subsequent processing.