Selecting a Method for the Manufacture of Porous Powder Filter Products

The article considers three methods of increasing the distribution uniformity of properties over the filtration area of powder filter materials at different stages of their manufacturing. It is shown that granulation of metal powders with a pore former increases the uniformity of permeability distribution over the filtration area by a factor of 2.3–3.5. Dry radial isostatic pressing ensures high distribution uniformity of properties, while the coefficient of variation of local permeability does not exceed 0.17. Radial compression allows increasing the uniformity of permeability distribution over the filtration area by 15 ... 22 % compared to that for the original powder filter materials. The selection of the method used in practice is determined by the shape, size and properties of the manufactured products and initial powders. The considered methods can be used in petrochemical engineering for the manufacture of porous powder products for filtering purposes, used to trap catalyst particles, filters for fine and coarse fuel and oil purification.

Catalpa ovata G. Don. potential medicinal value of leaves

Catalpa ovata G. Don. has a certain degree of appreciation because of its unique tree shape and wide crown. It also has certain adaptability. This experiment uses organic materials such as Fourier transform infrared (FT-IR) spectroscopy, gas chromatography-mass spectrometer (GC-MS), learning content management system, thermal desorption - GC-MS, termal gravimetric analyzer and other modern techniques to extract organic reagents from Catalpa ovata G. Don?s Leaves. The original powder was tested differently and analyzed, investigated. To explored and developed its potential medicinal value, and better understood its use in biomedicine, as well as perfumery and chemical industries, providing some research for further and in-depth research basis.

Effect of ball milling on the microstructure and performances of laser clad forming Cr3C2-NiCr composites

Purpose The original powder commonly used for laser 3D printing is atomized alloy powder. The purpose of this study is to investigate the effect of ball milling (BM) on the structure and performances of the alloy powder and its composite products. Design/methodology/approach BM powder of Ni-Cr-graphite elements was subjected to laser cladding forming and the effect of BM on the powder structure was studied by X-ray diffraction, metallographic microscopy and scanning electron microscopy. The laser cladding-formed coatings were also tested by reciprocating friction measures and electrochemical corrosion experiment. Findings The results showed that the grains of laser cladding-formed Cr3C2-NiCr coating of BM powder were more refined compared to the coating of the atomized powder. Moreover, the abrasion resistance and corrosion resistance were slightly improved. Originality/value This work offers guidance for new original powder selection for laser 3D printing/powder bed forming/selective laser melting applications.

Synthesis of AlMgB14: Effect of modes of mechanical activation of the raw powders on the properties of obtained materials

In work studies of phase composition, hardness and density of materials based on AlMgB14 synthesized by hot pressing method at temperatures of 1300 and 1400 °C under pressure 50 MPa from aluminum, magnesium and boron powders (E1 mixture), as well as from original powder of aluminum-magnesium alloy (E2 mixture) were conducted. AlMgB14 phase content of obtained bulk samples is ~ 95 wt. %. The maximum hardness of 14GPa and density of 2.1 g/cm3, respectively, has a sample, marked as E1, synthesized at a temperature of 1400 °C.

Cold Bonding Method for Metallic Powder Coatings

An efficient and simple method for preparing bonded metallic powder coating is in high demand in the paint manufacturing and application industries. The bonding purpose is to keep the mass percentage of metallic pigment consistent between the original and recycled coating powder, which aims at solving the problem of recyclability. One possible method capable of realizing this goal is using the binder to cohere metallic pigment with base particles through a cold bonding method. Through this approach, the pre-curing and high-reject-rate problems generally present in thermal bonding can be completely eliminated. In this paper, polyacrylic acid (PAA) and polyvinyl alcohol (PVA) are applied as binders for the bonding process. At various dosages of liquid binder and D.I. water, bonded samples with different bonding effect were prepared. Finally, a good bonding quality with the lowest variance between the mass concentrations of Al flakes in the original powder (before spray) and deposited powder (after spray) 2.94% with PAA as a binder and 0.46% with PVA as a binder was achieved. These results manifest that the cold bonding method is a green and simple approach for preparing the metallic powder coating.

Analysis of the Effect of 60Co-γ Irradiation Sterilization Technology on the Chemical Composition of Saffron Using UPLC and UPLC/Q-TOF-MS

To evaluate the effect of 60Co-γ irradiation sterilization technology on the chemical composition of saffron, we collected 10 batches of saffron samples and treated them with different irradiation doses. UPLC characteristic chromatogram showed that there was no significant effect of irradiation on 13 common peak areas. The results of cluster analysis and principal component analysis showed that there were no differences in the chemical composition in nonirradiated and irradiated samples. UPLC/Q-TOF-MS identified 40 characteristic components of saffron, and the results showed that all of these were detected in the saffron samples both with and without irradiation. Irradiation doses at or below 10 kGy had no significant effect on the chemical components of saffron. This provides a sound basis for the use of 60Co-γ ray irradiation sterilization technology during the preparation of original powder saffron as a medicinal herb, for the effective destruction of mycotoxin contamination.

Synthesis and Characterization of Nanosized Copper(II)-Phthalocyanine Pigment (PBI 15:3) with the Modified Surface. I

The research activity presented in this paper is intended to investigating of certain valuable nanosized blue pigment ( P Bl 15:3) prepared by 3-way synthesis (functionalization reactions) and conditionin(dispersing with or without encapsulation), namely obtaining stable aqueous dispersions of blue pigment with modified surface used in medium nonspecific for pigments. The techniques employed to characterize the structure and properties of blue pigment dispersions with functionalized particles compared to the original powder product were characterized by Fourier transform infrared spectroscopy FT-IR, thermogravimetric analysis (TGA), elemental analysis (EA) and particle size distribution (the distribution and average of particle diameter).In our finding the nano-dispersions obtained contain functionalized blue pigment particles with or without encapsulation in the form of liposomes with the average diameter below 200-300 nm, representing good results.

Removal of naphthalene from offshore produced water through immobilized nano-TiO2 aided photo-oxidation

In order to increase the applicability of photocatalysis in treating offshore produced water (OPW), an immobilized catalyst was introduced into the UV irradiation system and its performance on the degradation of organic compounds in OPW was evaluated. Naphthalene was selected as the target pollutant owing to its abundance in produced water and its chemical property as a typical polycyclic aromatic hydrocarbon. Aeroxide® P25 nano-scale TiO2 powder was immobilized on glass slides by a heat attachment method and its photocatalytic capacity was compared to that of the original powder in terms of naphthalene removal efficiency. The results of adsorption showed that the reduction of catalysts’ surface area by immobilization was similar to that by agglomeration. The photocatalytic reaction rate constants in the homogeneous and immobilized systems were 0.00219 min−1 and 0.00305 min−1, respectively, indicating that the immobilized catalyst had a better performance in photo-oxidation. The fouling of catalyst surface during the irradiation process came from the deposition of insoluble particles, organic matter, and the scaling of calcium. The immobilization of catalysts was more resistant to the substrate effects of OPW, indicating a promising alternative in treating OPW.