Browsing by Subject "composite"

Now showing 1 - 12 of 12

Access status: Open Access ,
3D carbon based phase change composites: A review on progress in fabrication strategies, thermal energy storage-conversion efficacy, prototypes, numerical models and applications
(2024) Das, Madhurima; Stachewicz, Urszula
Wydział Inżynierii Metali i Informatyki Przemysłowej
LHTES has emerged as an efficient and viable solution to mitigate a large amount of renewable and sustainable thermal energy wastage from solar radiation and industrial production in the twenty-first century. To date, 3D carbon/PCM composite has brought remarkable attention for achieving high performance in this field. This review provides a comprehensive outlook on the progress of 3D carbon and PCM-based composite materials as high-performance LHTES materials over the past 10 years, focusing on the synthesis strategies of 3D carbon, PCM infiltration process, and thermophysical attributes of 3D carbon/PCM composite. Furthermore, an effort has given to conduct rigorous literature to explore the utilization of different numerical assumptions and models for describing the heat transfer process between 3D carbon and PCM, thermal conductivity evaluation for the composite, and the mechanism of 3D carbon/PCM composite for battery thermal management and building application. The investigation of the advanced applications of 3D carbon/PCM composites reveals its potential utilization in building comfort, waste-heat recovery, power generation, and thermotherapy-based applications. Finally, the current shortcomings and future challenges associated with the developments of such composite are encountered. This comprehensive review will show the future pathway for researchers to develop high-performance composites in thermal management.
Access status: Open Access ,
A new »Emir« composite for the decolmatage of oil and gas layers after drilling and during deposit exploitation to increase the efficiency of hydrocarbon production
(AGH University of Science and Technology Press, 2022) Gubič, Igor Bogdanovič; Krupskij, Ûrij Zinovʹevič; Pavlunʹ, Mikola Mikolajovič; Vitenko, Vasilʹ; Feìčuk, Vitalij
A new effective composite »Emir« has been created, which reduces the swelling of clay minerals and cleans the near-well zone of oil and gas-saturated layers from residues of drilling fluid, technical and formational water, resin-asphaltene components and paraffin, thereby restoring the efficiency of the well. The composite has high cleaning characteristics and the ability to foam in the presence of highly mineralized waters (up to 250 g/l), oil products and mineral acids. It also forms both straight and reverse mobile water-oil emulsions, which is important for cleaning oil layers. Based on the results of testing the »Emir« composite in production conditions on gas and oil wells, it was concluded that the use of »Emir« allows the discharge of hydrocarbon fluids to increase from 20% to 50% or more. The »Emir« composite can also be used on »low-flow« wells which have been clogged or eliminated for geological and technical reasons, this makes it possible to significantly increase the recoverable reserves of hydrocarbons in various oil and gas-bearing regions, especially taking into account the small volumes of drilling and the low success rate of searching for new oil and gas fields.
Access status: Restricted ,
Badanie właściwości tłumiących materiałów kompozytowych na osnowie metalicznej
(Data obrony: 2018-01-29) Poręba, Magdalena
Wydział Odlewnictwa
Access status: Restricted ,
Delaminacja smektytów
(Data obrony: 2013-07-11) Rogowska, Melania
Wydział Geologii, Geofizyki i Ochrony Środowiska
The detailed understanding of the delamination of layered minerals is of a great importance in a design of new advanced nanomaterials. In this study, the attempt of delamination of various smectites was undertaken. Three natural dioctahedral smectites and one synthetic trioctahedral smectite were modified by ion exchange with two organic cations with different chain length: cetyltrimethylammonium (CTMA) and decyltrimethylammonium (DTMA) cations. Organo-minerals were dispersed in an organic solvent like 1-octanol. The systems obtained were colloidal but unstable. The XRD and FTIR techniques does not allow to conclude that delamination process took place. For the further investigation of the delamination process, a layer-by-layer composite was prepared, which consisted of hydrotalcite and montmorillonite. The obtained material, prepared by solvothermal treatment, suggests the delamination of both hydrotalcite and montmorillonite.
Access status: Open Access ,
Effect of test conditions on wear properties of steel-matrix composites
(Wydawnictwa AGH, 2017) Sulima, Iwona; Hyjek, Paweł
The friction coefficient and wear behavior of 316L austenitic stainless steel and 316L steel + 8vol% TiB? + 1vol% B composites were investigated within a temperature range of 20°C to 800°C. The materials were prepared by the powder metallurgy method. The wear behavior was studied by using a ball-on-disc wear tester at room temperature. The surface before and after wear tests was analyzed using scanning electron microscopy (SEM). The results indicated that the friction coefficient and wear resistance of stel-8TiB?-1B composites depend on the wear test conditions.
Access status: Open Access ,
High-temperature corrosion resistance of steel-matrix composites
(2015) Sulima, Iwona; Homa, Marta; Malczewski, Piotr
The results of corrosion studies of composite materials obtained by two methods of powder metallurgy are presented in the article. The main goal of the studies was to determine the high-temperature corrosion resistance of steel-matrix composites reinforced with 8 vol.% TiB2. Thermogravimetric analyses were conducted at 1100°C in air during a 24 h cycle. The microstructure of the composite after thermogravimetric studies was observed with a scanning electron microscope.
Access status: Restricted ,
Mikrostruktura i właściwości tribologiczne lokalnych wzmocnień kompozytowych typu TiC Fe/L35GSM
(Data obrony: 2015-07-23) Batóg, Paweł
Wydział Odlewnictwa
Access status: Restricted ,
Nanokompozyty haloizytowe oraz ich właściwości sorpcyjne względem wybranych anionów
(Data obrony: 2018-09-27) Hyla, Jakub
Wydział Geologii, Geofizyki i Ochrony Środowiska
W niniejszej pracy magisterskiej próbki haloizytu zostały pobrane ze złoża Dunino położonego niedaleko Legnicy na Dolnym Śląsku, natomiast hydrotalkit został zsyntezowany w laboratorium z użyciem metody koprecypitacyjnej oraz fizycznego mieszania. Do uzyskania kompozytów haloizytowo-hydrotalkitowych o zawartości 5%, 15% oraz 25% masowych LDH został użyty naturalny haloizyt oraz czyste LDH. Sorpcja As(V) oraz Cr(VI) została przedstawiona jako funkcja koncentracji anionów w stężeniach 1 mmol/l oraz 5 mmol/l dla pH wyjściowego równego 1, 3, 5 oraz 7. Dodatkowo została przeprowadzona sorpcja w roztworze o stężeniu 25 mmol dla pH wyjściowego równego 1, 3, 5 oraz 7. Największa zdolność sorpcyjna dla As(V) została zanotowana na czystym, kalcynowanym hydrotalkicie w 5 mmol roztworze o pH 5 osiągając 262 mmol/kg. Największe zdolności sorpcyjne anionów Cr(VI) wyniosły 1140 mmol/kg dla kalcynowanego hydrotalkitu w roztworze 25 mmol/l o pH 3. Przeprowadzone badania dowodzą, że sorpcja jest głównie związana z wymianą jonową As(V) oraz Cr(VI) za CO32-. W związku z faktem, że hydrotalkit ulega łatwemu rozpuszczeniu w kwaśnym środowisku, kalcynowane kompozyty oraz kalcynowane LDH mogą być potencjalnie użyte w celach oczyszczania kwaśnych wód kopalnianych (AMD) z zanieczyszczeń anionowych. Ważne jest aby podkreślić, że zdolności sorpcyjne hydrotalkitu nie uległy pogorszeniu w zastosowanych kompozytach.
Access status: Open Access ,
Nanoparticles distribution and agglomeration analysis in electrospun fiber based composites for desired mechanical performance of poly(3-hydroxybuty-rate-co-3-hydroxyvalerate (PHBV) scaffolds with hydroxyapatite (HA) and titanium dioxide (TiO2) towards medical applications
(2022) Karbowniczek, Joanna; Ura, Daniel Paweł; Stachewicz, Urszula
Wydział Inżynierii Metali i Informatyki Przemysłowej
Scaffolds designed for tissue engineering must meet multiple criteria, including mechanical performance matching particular tissue properties. One of the strategies to improve electrospun scaffolds strength is the incorporation of ceramic nanoparticles. In this work, the effect of the addition of hydroxyapatite (HA) and titanium dioxide ($TiO_{2}$) nanoparticles on tensile strength, elongation and toughness of poly (3-hydroxybuty-rate-co-3-hydroxyvalerate (PHBV) based fibers was tested. Samples morphology along with chemical composition and particles distribution were characterized by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and Fourier transform infrared spectroscopy (FTIR). Mechanical properties of PHBV-based electrospun scaffolds were correlated with the nanoparticles' distributions examined via microscopy analysis to understand the failure mechanism of composite fibers. We observed a significant improvement of mechanical properties of composites containing HA nanoparticles compared with solely PHBV fibers. Notably, 3 times higher tensile strength and strain at failure, followed by 16 times improved toughness, was correlated with homogenous distribution of HA nanoparticles with an average area of aggregates reaching 0.11 μm2. At the same time, two times larger $TiO_{2}$ aggregates were irregularly formed along PHBV fibers and caused deterioration of their mechanical properties. We showed the relevant strategy of particle distribution in fibers that are able to tailor mechanical properties by controlling the size and distribution of ceramic fillers in hybrid scaffolds.
Access status: Open Access ,
Studies on obtaining Cu-CNT composites by continuous casting method
(2014) Kwaśniewski, Paweł; Kiesiewicz, Grzegorz
The progress of civilization force that we look for new materials with higher exploitation properties that can be used in different types of installations and will allow to increase their technological potential. One of the research trends is concentrated on the search of new materials with the above standard electrical conductivity, mechanical and rheological properties, higher thermal resistance and technological properties, all in comparison to pure copper. One of the ideas of such material is composite produced from copper and high quality carbon materials (CNT’s or graphene). Regarding to the above, presented paper refers to the research results concentrated on the metallurgical synthesis of Cu-CNT’s materials obtained with the use of the continuous casting method. Within this paper research works over the synthesis method and obtained material characterization, for electrical, mechanical and structural properties (for both as cast and after cold drawing tempers) are shown.
Access status: Restricted ,
The adhesion between the teeth and the dental filling materials
(Data obrony: 2016-07-13) Al-Jubouri, Rifqah
Wydział Elektrotechniki, Automatyki, Informatyki i Inżynierii Biomedycznej
Access status: Open Access ,
Zawisza4000 – the design of the Polish first bi-liquid rocket’s propulsion system
(Wydawnictwa AGH, 2023) Cichoń, Mikołaj; Fitner, Paweł; Gibiec, Mariusz
AGH Space Systems stands as a student-driven organization situated within the AGH University of Krakow, Cracow, Poland. At present, the team is fully engrossed in the development of Poland’s first bi-liquid propellant rocket. Named the “Turbulence” rocket, its propulsion is entrusted to the one-of-a-kind Z4000 engine, utilizing ethanol and nitrous oxide as its propellants. Drawing from their adeptness in hybrid rocket technology, the team ingeniously devised the Z4000 propulsion system, distinguished by its $N_{2}O$ self-pressurization cycle, elegantly embodied through a piston-dependent pressure vessel solution. Additionally, the team incorporated a composite combustion chamber into the system’s architecture. These pioneering elements, among others, firmly position this nitrous oxide-powered demonstrator as a standout contender for prospective applications within the space industry.