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Wyszukujesz frazę "TiO2 particles" wg kryterium: Temat


Wyświetlanie 1-2 z 2
Tytuł:
Fine and ultrafine TiO2 particles in aerosol in Kraków (Poland)
Autorzy:
Wilczyńska-Michalik, Wanda
Rzeźnikiewicz, Kamil
Pietras, Barłomiej
Michalik, Marek
Powiązania:
https://bibliotekanauki.pl/articles/127601.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Mineralogiczne
Tematy:
TiO2 particles
single particle analysis
aerosol
Kraków
Opis:
During single particle analysis of aerosol in Kraków (Poland) we noticed a new component, that is, aggregates of TiO2 particles. These aggregates are from 0.5 to 4 μm and are composed of individual particles whose size typically varies from between 100 and 350 nm. Smaller particles (below 100 nm) also occur. TiO2 particles are relatively abundant in the summer. The size distribution of the particles corresponds to “pigmentary” TiO2, which indicates that they could be derived from paints and building materials. TiO2 particles were not previously identified in aerosol samples in Kraków, and therefore this phenomenon is likely to be related to the common usage of new building materials and paints. A review of the literature suggests that TiO2 particles, especially within the nanosize range, could result in health and environmental impacts; however, evaluation of the actual threat is difficult.
Źródło:
Mineralogia; 2014, 45, 3/4; 65-77
1899-8291
1899-8526
Pojawia się w:
Mineralogia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of NI-TIO2 and NI-TIO2-graphene coatings and heat treatment hardening on solid particles erosion resistance of grade 410 stainless steel
Autorzy:
Khalid, Wissam
Al-Tameemi, Hamza A.
Powiązania:
https://bibliotekanauki.pl/articles/38912091.pdf
Data publikacji:
2023
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
solid particles erosion
wear rate
wear resistance
erosion testers
AISI 410 stainless steel
Ni-TiO2 coating
Ni-TiO2-graphene coating
Opis:
Erosion by solid particles is a serious problem in many applications, especially in rotary machines with steel blades. Many coatings are currently being developed to improve erosion resistance. This study focuses on investigating the solid particles erosion (SPE) resistance of AISI 410 stainless steel and improving the SPE resistance using three different anti-wear techniques: hard coating (Ni-TiO2), hard coating with low shear resistance (Ni-TiO2-graphene) and hardening by heat treatment. The study also investigates the effect of different factors, including impact angle, jet pressure (particle speed) and solid particle type on each of the four types of specimens. The investigated anti-wear techniques improved the erosion wear rate by different percentages, such as 35.2% using Ni-TiO2 coating, 36% using Ni-TiO2-graphene, and 53.75% using heat-treatment when silica sand, a 45◦ impact angle and a speed of 36.72 m/s were used. The results indicate a ductile erosion mechanism as the weight loss decreases with an increase in the impact angle. The investigated coatings were found to provide more stable erosion resistance under different impact angles. Surface roughness was reduced after SPE for coated surfaces, and surfaces showing a lower wear rate may not necessarily show less change in surface roughness. It was observed that deformation in the form of waviness only occurs when the surface is impacted by small rounded particles at a 45◦ angle. Wear rate parameters were calculated, which can be used to estimate the wear rate for the investigated material under various conditions.
Źródło:
Engineering Transactions; 2023, 71, 4; 571-593
0867-888X
Pojawia się w:
Engineering Transactions
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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