Recently, Washington State University for the first time realized the use of 3D printing technology to form a gradient composite structure composed of two different materials in one step, which can effectively reduce the manufacturing process and quickly manufacture complex components with multiple materials. The research was published in the May issue of Additive Manufacturing.
Metal-ceramic gradient composites have the advantages of metal and ceramic properties, with high hardness on the ceramic side as well as good wear and corrosion resistance, good ductility, high thermal conductivity and electrical conductivity on the metal side. The traditional method of making metal-ceramic gradient composites is pressing and sintering, requiring not only multiple time consuming steps, but also lack of control over the metal-ceramic transition region. The use of a powder bed based additive manufacturing process can be used to make metal-ceramic gradient materials, but this method requires multiple steps (e.g., premixed powder and converted powder) during processing, which is inefficient. Also, since the thermal conductivity and the coefficient of thermal expansion between the ceramic and the metal material are significantly different, there are still many difficulties in manufacturing the metal-ceramic gradient structure using the additive.
Laser Engineered Net Forming (LENSTM) is a direct energy deposition additive manufacturing technique that uses a laser beam as an energy source to form a molten pool on a substrate and supply powder thereon. This technology can be used to make metal and ceramic materials, bimetallic materials and high hardness ceramic coatings. The researchers used the LENS process to fabricate a metal-ceramic gradient structure consisting of Ti6Al4V alloy, Ti6Al4V+Al2O3 composite and pure Al2O3 ceramics. The microstructure and phase analysis of the cross section of Ti-Al2O3 gradient structure were carried out. , element distribution and microhardness measurement. The results show that each part has its own unique microstructure and phase.
In addition, the researchers used the LENS process to create a nickel-chromium-copper gradient structure. Nickel-based superalloy Inconel 718 is a high temperature corrosion resistant material that is widely used in gas turbines and rocket engines. The material has good high temperature resistance but low thermal conductivity. By depositing GROCp-84 on Inconel 718, the thermal conductivity of Inconel 718 will increase while maintaining the high strength of Inconel 718 at high temperatures. Compared with pure Inconel 718 alloy, the thermal diffusivity is increased by 250% and the conductivity is increased by 300%, which can improve the life and fuel efficiency of aircraft engines, opening up a new multi-material metal additive manufacturing for the next generation of aerospace structural parts. The possibility.
Vegetable Seedlings Led Grow Light
A lamp tube is a specially designed lighting device designed to provide the required light for plants grown indoors. It usually consists of multiple LED lamp beads that emit specific wavelengths of light to meet the needs of plant photosynthesis.
The main characteristics of plant lamps are as follows:
1. Spectral regulation: plant lamps can emit light of specific wavelengths suitable for plant growth, such as blue, red and violet light. These rays can provide the required spectrum at different growth stages, promoting the healthy growth of the plant.
2. High efficiency and energy saving: The plant light tube uses LED technology, which has the characteristics of high efficiency and low energy consumption. Compared to traditional fluorescent or incandescent lamps, plant lamps are more energy efficient and can save energy costs.
3. Long life: LED lamp beads have a long life, usually up to tens of thousands of hours. This means that plant lamps do not require frequent bulb changes, reducing maintenance and replacement costs.
4. Adjustable brightness: plant lamps usually have the function of adjustable brightness, which can adjust the light intensity according to different plant needs and growth stages to provide the best growth environment.
5. Safe and reliable: Plant lamps use low voltage power supply and have a low fire risk. In addition, it is usually designed to be water and dust resistant and suitable for both indoor and outdoor growing environments.
In short, the plant lamp is a lighting device designed for indoor planting, by emitting a specific wavelength of light, to provide the required light for the plant and promote its healthy growth. It has the characteristics of high efficiency and energy saving, long life, adjustable brightness, safety and reliability, and is suitable for all kinds of plant planting environment.
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