Risk aversion plunged on the positive news of the Russia-Ukraine talks. After several days of rising oil prices, the price of precious metals continued to fall. Domestic futures markets remain stable for the time being.
Back in international markets, WTI crude futures briefly dipped below $100 a barrel, while Brent crude hit its lowest intraday level in nearly two weeks. Spot gold briefly fell below $1,900 an ounce. Comex gold futures closed down 1.1 percent at $1,918.4 an ounce. Comex silver futures closed down 1.14 percent at $24.91 an ounce. "Recently, crude oil prices have been extremely sensitive to changes in geopolitical news." Traders believe that the current oil price is still in the broad impact, Ukraine will still be a premium in the case, although the market further decline, but should not be too pessimistic, it is recommended to wait and see for the time being. The Ukrainian premium is still there and there will be some volatility in the Ti6Al4V powder market.
In the powder bed laser melting technology, from the production, transportation, storage, printing and recycling of materials, the powder has been under a variety of mechanical and atmospheric environments throughout the process chain, the chemical composition and shape of the powder particles, and the entire process. The characteristics of powder materials may be affected by factors such as the atmosphere, temperature, humidity, and external forces. This article discusses the potentially important influencing factors of TC4 powder in the entire process. The research results can be used in other powder processing and management to ensure the quality of the material throughout the service life and make the SLM process more robust and reliable.
In order to evaluate the characteristics and batch stability of the powder, the same specifications and two batches produced by TC4-Ti6Al4V(level 5) three different processes (gas atomization EIGA, plasma atomization PA, inductively coupled plasma atomization ICPA) were studied. For powders, the particle size distribution, particle morphology and fluidity of these powders were measured.
The results show that the sizes of the three powder particles are between 15-65 microns, with a Gaussian distribution, but the PA and ICPA powders show a wider particle size distribution compared with the EIGA powder. The flow time measured by the Hall flowmeter is in the range of 14.6s-16.1s, indicating that all powders and batches have good flowability. Electron microscopy results show that the three powders have high spherical shapes, but the EIGA powder particles are slightly elongated, while the ICPA powder contains a lot of satellite powder.
In order to study whether argon protection is required during powder storage, two powder containers were stored under the same conditions of 30°C and 30% relative humidity. One container has been stored intact, and the protective atmosphere of the other container is destroyed by one opening process. After a storage period of ten days, samples for mechanical testing and elemental measurement were prepared.
The results of the tensile test show that the ultimate tensile strength of the sample is basically the same in a protective atmosphere and an unprotected atmosphere; the powder stored in a humid environment has the highest ultimate strength, which is slightly higher than that of the dry powder printed sample 5%, and the elongation rate dropped severely. Gas content measurement confirmed that in a humid environment, the oxygen content of the sample is about 10% higher than that in a dry environment, which leads to material embrittlement.
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3D printing technology emerged in the mid-1990s and is actually the latest rapid prototyping device utilizing technologies such as light curing and paper lamination. It is basically the same as ordinary printing. The printer is equipped with "printing materials" such as liquid or powder. After connecting to the computer, the "printing materials" are superimposed layer by layer through computer control, and finally the blueprint on the computer is turned into a real thing. This printing technology is called 3D stereo printing technology.
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