Ceramics are wear-resistant, scratch-resistant, skin-friendly and non-allergenic, and have the color of jade and will last forever The advantages of fading resistance and low cost have made it an excellent material choice for smart wear. Andceramic injection moldingmoldingIt is one of the main molding processes for smart wearable ceramic appearance parts today.
1. Ceramic injection molding process
Ceramic injection molding is a near-net plastic injection molding technology developed on the basis of polymer injection molding technology. Size plastic molding method, the basic process flow of smart wearable ceramic injection molding mainly includes four stages: feed preparation, injection molding, degreasing and sintering:
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1. Feeding preparation OxidationYttrium-stabilized zirconia powder and surfactant are weighed in proportion. After adding ethanol, ball mill and mix. Dry and sieve to obtain a slurry, which is then mixed with a binder, kneaded, and granulated to obtain an injection feed.
Key to feeding preparation:
Choose appropriate binder, compatibility and shear of binder with ceramic powder Good dispersion, eliminating aggregation;< o:p>
Appropriate binder content to make the feed material have good fluidity;
Increase the loading capacity (solid content) of ceramic powder and reduce dimensional deformation.
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2. Injection molding Place the injection molding feed material into the injection molding machine Inside, it is heated and transformed into a viscous melt, which is injected into a metal mold at a high speed under a certain temperature and pressure. After cooling, it is demoulded and taken out to obtain a ceramic body. The key to injection molding:
Rational design and processing of molds (gates, runners, accuracy, materials, etc.)
Setting and optimization of injection parameters (temperature, pressure, mold temperature)
Exhaust gas and green body stress during mold filling
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3. Degreasing Degreasing is the injection molding of ceramic blanks The process of removing the binder components by physical or chemical methods. Due to different binder systems, there are differences in degreasing processes. Degreasing methods for injection molded ceramics include: thermal degreasing, solvent degreasing, and catalytic degreasing. Choose an efficient and safe degreasing technology for degreasing to obtain a blank.
4. Sintering
Place the ceramic blank inSintered at a high temperature of 1300°C~1800°C. sintering isThe final process of ceramic body molding, a large part of the performance of ceramic products is determined by sintering. For zirconia ceramics to be sintered with high density and uniformity, not only the degreasing step in the previous processing step is crucial, but it is also affected by factors such as powder, additives, sintering temperature and time, pressure, and sintering atmosphere.
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2. Advantages and Features of Ceramic Injection Molding< span style="font-family: 宋体; color: rgb(51, 51, 51); letter-spacing: 0.4pt; font-size: 10.5pt;">
Smart wearable ceramic appearance parts include ceramic watch case, ceramic bezel, ceramic dial, ceramic bottom cover, ceramic Products such as watch crowns and ceramic bracelets are small in size and require high precision.
The advantages of using ceramic injection molding for smart wearable ceramic appearance parts are:
Can be used to produce near-net shape small ceramic parts and molded products with complex geometric shapes and special requirements High precision, uniform green density, high green strength, excellent sintered body performance and good product quality consistency mean that the sintered ceramic products do not need to be machined or require less processing, thus reducing expensive ceramic processing costs;
The molding process has a high degree of mechanization and automation, high production efficiency, short molding cycle, and The management and control are also very convenient, and it is easy to realize mass and large-scale production;
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The molded ceramic products have extremely high dimensional accuracy and Surface finish, the surface finish can reach5um. Therefore, CIM technology has become one of the high-precision and high-efficiency molding methods among existing ceramic molding technologies, and has been widely used and researched at home and abroad.
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