Temat: TiC - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Composite zones produced in situ in the Ni₃Al phase
Autorzy:: Olejnik, E.
Janas, A.
Sikora, G.
Tokarski, T.
Nowak, J.
Tematy:: composite layer
Ni3Al
cast intermetallic
in situ
synthesis TiC carbides
warstwa kompozytowa
węglik TiC; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/379777.pdf Link otwiera się w nowym oknie
Opis:: The study presents the results of research on the development of composite zones in castings based on the intermetallic phase of Ni₃Al. Composite zones were obtained by placing packets with substrates for the reaction of titanium carbide in a foundry mould. To provide a variable carbides content in the composite zone, two compositions of the packets were prepared. The first packet contained only substrates for the reaction of TiC synthesis; the second one also contained a filler. The resulting composite zones in castings were examined for the filler effect on changes in the volume fraction, size and morphology of carbides in the zone. In addition, the effect of filler on the mechanical properties of the zone was verified, observing changes of Vickers hardness in this area. It was found that the presence of filler in the composition of the packet for synthesis reduced the content of carbides, as well as their size and morphology. Lower surface content of carbides reduced hardness of the zone, which enabled smooth control of the mechanical properties. At the same time, the use of the selected filler did not disturb the course of the TiC carbide synthesis.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 2.

Tytuł:: Przemysłowe chemikalia w służbie terroru: rozpoznanie i przeciwdziałanie wykorzystaniu TIC w atakach terrorystycznych
Autorzy:: Lipold, Patrycja
Szklarski, Łukasz
Współwytwórcy:: Lipold, Patrycja
Wydawca:: Wydawnictwo Naukowe TYGIEL sp. z o.o.
Cytata wydawnicza:: Szklarski, Ł "Przemysłowe chemikalia w służbie terroru: rozpoznanie i przeciwdziałanie wykorzystaniu TIC w atakach terrorystycznych" strony 50-63 w monografi "Przemysłowe chemikalia w służbie terroru: rozpoznanie i przeciwdziałanie wykorzystaniu TIC w atakach terrorystycznych" 20.09.20204 Wydawnictwo Naukowe TYGIEL sp. z o.o.
Opis:: Przemysłowe chemikalia w służbie terroru: Rozpoznanie i przeciwdziałanie wykorzystaniu TIC w atakach terrorystycznychCelem niniejszej pracy jest analiza zagrożeń wynikających z potencjalnego wykorzystania toksycznych chemikaliówprzemysłowych (TIC) w działaniach terrorystycznych. Artykuł skupia się na i charakterystyce TIC, które mogą stanowićalternatywę dla konwencjonalnych bojowych środków trujących (CWA). Zaprezentowano różnorodność i właściwości TIC,historyczne przypadki ich użycia oraz potencjalne scenariusze wykorzystania w przyszłości. Omówiono także metody wykrywania,strategie reagowania i procedury dekontaminacji. Praca dostarcza wnikliwej analizy zagrożeń związanych z TIC, podkreślającznaczenie kontynuacji badań i rozwoju strategii przeciwdziałania terroryzmowi chemicznemu.
Dostawca treści:: Repozytorium Centrum Otwartej Nauki

Inne

na półce

Skocz do pozycji: 3.

Tytuł:: WC-Co coatings and sinters modified with nano-sized tic microstructure – quantitative evaluation
Autorzy:: Myalska, H.
Dybowski, B.
Moskal, G.
Tematy:: coatings
nanoparticles
TiC
WC-Co
quantitative evaluation; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/102338.pdf Link otwiera się w nowym oknie
Opis:: The different concepts of WC-Co thermally sprayed coatings improvement may be considered and the application of nanoparticles, as the mechanical strengthening addition, is one of them. Nanostructured WC-Co coatings are characterized by higher hardness than the coatings formed from micrometric WC grains; whereas coatings with bimodal distribution of particles reveal greater wear resistance than the coatings obtained exclusively from nano-sized powders. Mixed effect of the matrix reinforcement by nanoparticles and strong fix of the micron-sized WC grains was proposed as a possible reason for enhanced wear resistance of bimodal coatings. In order to obtain a bimodal distribution of particles in the material standard WC-Co (83-17) powder was mixed with nanometric TiC powder (40–100 nm). The amount of TiC in powder mixtures was in the range from 1 to 7 wt.%. The mixtures were deposited on steel substrate using HVAF method and also hot pressed in vacuum. The microstructure of obtained coatings and sinters was quantitatively evaluated. Sinters revealed more homogenous distribution of the nano-sized TiC particles than the coatings. The addition of nano-sized TiC in the case of coatings has led to the decrease of its porosity. The agglomeration of nano-sized TiC particles in the coatings results in the decrease of material’s hardness.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 4.

Tytuł:: Effect of Boron and Tungsten Carbides on the Properties of TiC-Reinforced Tool Steel Matrix Composite Produced by Powder Metallurgy
Autorzy:: Slokar Benić, Ljerka
Šubić, Jadranko
Erman, Žiga
Tematy:: metal matrix composite
steel/TiC composite
powder metallurgy
properties
microstructure; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/355244.pdf Link otwiera się w nowym oknie
Opis:: The influence of boron carbide and tungsten carbide on the apparent porosity, density, coercive force, hardness and micro-structure of metal matrix composite of the Ferro-TiC type, is presented in this paper. The samples of investigated steel/titanium carbide composite were produced by powder metallurgy process, i.e. by powders mixing and compacting followed by sintering in the vacuum furnace. According to the results, steel/titanium carbide composite materials with addition up to 11.9 vol.% of boron carbide are interesting to detailed investigation as well as materials having more than 17.2 vol.% of tungsten carbide because these compositions show significant changes in hardness and coercive force values.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 5.

Tytuł:: Evaluation of the Mechanical and Electrical Properties of Spark Plasma Sintered Titanium Carbide Reinforced Alumina Ceramic Composite
Autorzy:: Selvakumar, G.
Prakash, S. Ram
Rajkumar, K.
Tematy:: Spark Plasma Sintering
alumina composite
TiC
mechanical properties
fracture toughness; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/2049356.pdf Link otwiera się w nowym oknie
Opis:: Spark Plasma Sintering (SPS) is identified as a suitable technique to prepare the alumina titanium carbide composite to overcome the difficulty in fabricating it through other consolidation method. The present work focuses on the fabrication and characterization of a series of titanium carbide reinforced alumina ceramic composites using a spark plasma sintering process. The titanium carbide reinforcement on the alumina matrix is varied between 20 and 35 wt.%, in order to improve the electrical conductivity and fracture toughness of the composites. The particle size of the starting powders at received and ball milled conditions was analysed through Particle size analyser and Scanning Electron Microscope (SEM). Microstructural analysis revealed that the TiC reinforcement is uniformly dispersed in the sintered composite. XRD report showed that α-alumina and titanium carbide were the two dominant phases without the formation of any reaction phases. Further, the correlation between mechanical and physical properties of the prepared composite was investigated as a function of TiC. Various fracture toughening indicators like crack deflection, bridging and branching were analysed by Vicker’s indentation method. Electrical resistivity of the sintered compact decreases proportionally with the increase in titanium carbide constituents. Maximum density (98.80%) and hardness (20.56 GPa) was obtained for 30 wt. % reinforced composite. Almost 40% improvement in fracture toughness is noted for 25 wt. % reinforced composite. This work demonstrates the synthesis and fabrication of alumina titanium carbide composites at low temperature via SPS resulted in obtaining an intact compact with improved mechanical and electrical properties.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 6.

Tytuł:: Locally Reinforcement TiC-Fe Type Produced in Situ in Castings
Autorzy:: Olejnik, E.
Szymański, Ł.
Kurtyka, P.
Tokarski, T.
Maziarz, W
Grabowska, B.
Czapla, P.
Tematy:: MMCs
reinforcement
TiC
in situ
hardness
ball-on-disc
zbrojenie
twardość; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/380995.pdf Link otwiera się w nowym oknie
Opis:: Refinement is one of the most energy consuming technological process, aimed at obtaining mineral raw materials of the proper grain size. Cast structural elements such as jaws or hammers in crushing machines operate under conditions of an intensive wear. The data indicate that 80% of failures of machines and devices is caused by wearing of rubbing surfaces. This problem became the subject of several scientific and industrial investigations carried out in the whole world in order to produce materials ultra- wear resistant. Methods allowing to obtain wear resistant composite castings are discussed in the hereby paper. Within the performed research microstructures of the produced composite zones were presented and the comparative analysis with regard to mechanical and functional properties of local composite reinforcements in relation to the commercial alloys of increased wear resistance was performed. The results show almost twenty five times increase in wear resistance compared to manganese cast steel containing 18% Mn.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 7.

Tytuł:: Microstructure and Properties of TiC/Ti Coatings Deposited by the Supersonic Cold Gas Spray Technique
Autorzy:: Kusiński, J.
Kac, S.
Kowalski, K.
Dosta, S.
Georgiou, E. P.
Garcia-Forgas, J.
Matteazzi, P.
Tematy:: cold gas spraying
Ti
TiC
CerMet coating
SEM
TEM
wear resistance; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/356608.pdf Link otwiera się w nowym oknie
Opis:: Nanostructured, biocompatible, TiC/Ti Supersonic Cold Gas Sprayed coatings were deposited onto a Ti6Al4V alloy and their microstructure, wear resistance and hardness were investigated. The starting nanostructured powder, containing a varied mixture of Ti and TiC particles, was produced by high energy ball milling. Scanning and transmission electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray diffraction were used for structural and chemical analyses of powder particles and coatings. Coatings, 250-350 μm thick, preserving the nanostructure and chemical powder composition, with low porosity and relatively high hardness (~850 HV), were obtained. These nanostructured TiC/Ti coatings exhibited better tribological properties than commonly used biomedical benchmark materials, due to an appropriate balance of hard and soft nano-phases.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 8.

Tytuł:: Microstructure, Hardness and Wear Resistance of Local TiC-ZrO2/FeCr Reinforcement Fabricated in Situ in Steel Castings
Autorzy:: Sobula, S.
Olejnik, E.
Kurtyka, P.
Szymański, Ł.
Tokarski, T.
Tematy:: wear resistance
composite casting
TiC reinforced cast steel
metal matrix composites; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/355914.pdf Link otwiera się w nowym oknie
Opis:: Wear resistance of TiC-ZrO₂-Fe locally reinforced steel casting has been investigated. Composites were obtained by introducing to mould cavity compact with TiC reaction substrates, ZrO₂ particles and addition of moderator. Casting with local reinforcement – composite zone was obtained. Structure and microstructure of composite zone were investigated with use of X-ray diffraction (XRD) and scanning electron microscope (SEM) methods. The Miller slurry machine and Ball-on-Disc tester were used to determine wear resistance of the fabricated locally reinforced TiC-ZrO₂-Fe composites. The worn surface of specimens after test, was studied by SEM. Due to the presence of TiC and ZrO₂ particles in composite zone steel castings exhibited higher abrasion resistance than chromium white cast iron with Ni addition Ni-Hard 1 type and comparable with composites with high TiC content.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 9.

Tytuł:: Effect of Ti, Nb, Cr and B on structure and mechanical properties of high aluminium cast iron
Autorzy:: Kopyciński, D.
Tematy:: high aluminium cast iron
carbides Al4C3
carbides TiC
intermetallic FeAl
iron aluminides
żeliwo wysokoaluminiowe
węglik AL4C3
węglik TiC
faza międzymetaliczna FeAl
aluminidek żelaza; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/383199.pdf Link otwiera się w nowym oknie
Opis:: In this work, a method was investigated to eliminate the presence of undesirable Al4C3 phases in a high-aluminium alloys, and thus improve the production process. The melting conditions employed in this work enabled the formation of a Fe-Al-C liquid solution. Moreover, titanium additions into the liquid allowed the precipitation of TiC. According to this reaction, the extent of carbon removal from the melt is strongly influenced by the amount of Ti additions. Hence, proper titanium levels can result in total removal of carbon from the liquid. Notice from this figure that Ti additions above 4.5%, totally eliminate the undesirable Al4C3 precipitates. Making Cr, Ti, B additions reduces size of FeAl alloys grains. In addition, this work indicates that the high-aluminium cast iron posses high oxidation resistance, exceeding that of high-chromium cast iron and chromium cast steels. Finally, the alloy ductility can be enhanced by additions of dopants such as B and Cr. Hence, additions of 0.03% B and 0.03%B-5% Cr combined with a heat treatment were implemented. As a result, the alloy ductility was significantly improved, where the strain of up to 5.3%, (B alone) or 15% (B-Cr) were obtained.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 10.

Tytuł:: Microstructural Evolution During Laser Surface Alloying of Ductile Cast Iron with Titanium
Autorzy:: Janicki, D.
Tematy:: in-situ composites
TiC
laser surface alloying
diode laser
ductile cast iron; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/351680.pdf Link otwiera się w nowym oknie
Opis:: Diode laser surface alloying process was used to the in-situ synthesis of TiC-reinforced composite surface layers on the ductile cast iron substrate. The obtained composite surface layers were investigated using optical and scanning electron microscopy, and XRD diffraction. It was found that the morphology and fraction of TiC phase is directly dependent upon both the concentration of titanium in the molten pool and also the solidification rate. With increasing titanium content, the fraction of TiC increases, whereas the fraction of cementite decreases. The TiC phase promotes a heterogeneous nucleation of primary austenite grains, what reduces a tendency of cracking in the alloyed layers.
Dostawca treści:: Biblioteka Nauki

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