Fe-Based Micro- and Nanocomposite Coatings Produced by Amorphous Alloy Crystallization Based on Electrospark Deposition

2010 ◽  
Vol 97-101 ◽  
pp. 2205-2208 ◽  
Author(s):  
Xia Zhou ◽  
Guo Hui Qu
Keyword(s):  
Cast Iron ◽  
Amorphous Alloy ◽  
Electrode Materials ◽  
Composite Coatings ◽  
Nodular Cast Iron ◽  
Electrospark Deposition ◽  
Alloy Matrix ◽  
Nano Crystalline ◽  
High Microhardness ◽  
Iron Based

The aim of this paper is to explore the possibility of a novel surface technique for Fe-based amorphous and micro-nano composite coatings. A kind of iron based amorphous and micro/nano-crystalline alloy powder which contains Fe, Ni, Cr, W, Mo, B, Si, C etc. was first prepared by mechanical alloying method. Iron based amorphous alloy coatings were then deposited on nodular cast iron substrate by electro-spark deposition using electrode materials with the ball-milling iron based alloy and SiC mixed powders. Annealing crystallization treatment of the Fe-based amorphous alloy coatings was conducted at last. The microstructure and surface morphology of the coating were analyzed by optical microscopy (OM) and scanning electron microscopy (SEM), the amorphous and crystal configuration were confirmed with an X-ray diffractometer (XRD), the microhardness was measured with a micro-sclerometer. The experimental results show that the Fe-based composite coatings are composed of Fe-based amorphous alloy matrix and dispersion strengthened micro- and nanocrystalline particles. The coatings of about 60 m in thickness are uniform, dense and metallurgically bonded to the substrate with high microhardness of about 880 (HV100, 15 S), implying a much improved wear resistance on surface of cast iron.

scholarly journals Determination of Braking Speed of Developed Hybrid Particle Reinforced Aluminium Alloy

2021 ◽  
Vol 6 (3) ◽  
Author(s):  
Justine O Bucham ◽  
Baba A Aliyu ◽  
Abubakar Muhammad
Keyword(s):  
Silicon Carbide ◽  
Cast Iron ◽  
Aluminium Alloy ◽  
Nodular Cast Iron ◽  
Mechanical Tests ◽  
Coconut Shell ◽  
Brake Disc ◽  
Alloy Sample ◽  
Alloy Matrix ◽  
Coconut Shell Ash

Abstract- This paper is aimed at comparing the braking speed of the developed Composite Brake Disc (CBD) with that of a nodular cast iron Honda Accord (2000) Model Brake Disc (HABD). The test samples were produced from Aluminium alloy (Al6061), Coconut Shell Ash (CSA) and Silicon Carbide (SiC) by Stir casting and machined into standard specimens for microstructure analysis, density test, mechanical tests (hardness, tensile and impact), wear test and thermal test. The characterization of coconut shell ash particle was carried out using X-ray Flourescent equipment. Six samples were produced, four composite samples; C1 (70% Al, 5% SiC, 20% CSA), C2 (70% Al, 10% SiC, 15% CSA), C3 (70% Al, 15% SiC, 10% CSA) and C4 (70% Al, 20% SiC, 5% CSA), aluminium alloy sample (A1) and as-cast nodular cast iron sample (N1) obtained from HABD. Sample ‘C4’ had the best physical, mechanical, wear and thermal properties (Densty: 3.15 g/cm3, Hardness: 68 kg/mm2, Tensile Strength:  196.12 N/mm2, Impact Energy: 8.05 J, Wear rate: 0.0002328 g/m, Thermal Conductivity: 72.57 W/m-K) and was used to produce the CBD. From the values of coefficient of frictions obtained for CBD and HABD, the braking speeds were calculated and HABD was seen to have a lower braking speed (56.65 m/s) than the CBD (94.42 m/s) because of its higher coefficient of friction. The higher braking speed of the composite brake disc (CBD) as compared to the Honda Accord Brake Disc (HABD) could be as a result of inadequate reinforcements in the aluminium alloy matrix. Hence,  the produced CBD cannot be used as an alternative for the nodular cast iron Honda accord brake disc (HABD) even as problems of heavy weight and breakage that may occur due to heavy impact associated with cast iron brake disc have been addressed using the developed composite.Keywords,- Aluminium Alloy, Braking Speed, Coconut Shell, Composite, Silicon Carbide

Prediction of the Fatigue Strength Defining Mechanism of Nodular Cast Iron Based on Statistical Microstructural Features

2021 ◽  
Author(s):  
Joona Vaara ◽  
Miikka Väntänen ◽  
Jarkko Laine ◽  
Jukka Kemppainen ◽  
Tero Frondelius
Keyword(s):  
Cast Iron ◽  
Fatigue Strength ◽  
Nodular Cast Iron ◽  
Iron Based

scholarly journals Influence of Al on glass forming ability and nanocrystallization behavior of cast-iron based bulk amorphous alloy

2015 ◽  
Vol 30 (6) ◽  
pp. 818-824 ◽  
Author(s):  
Hyo Yun Jung ◽  
Mihai Stoica ◽  
Seong Hoon Yi ◽  
Do Hyang Kim ◽  
Jürgen Eckert
Keyword(s):  
Cast Iron ◽  
Amorphous Alloy ◽  
Glass Forming Ability ◽  
Bulk Amorphous Alloy ◽  
Glass Forming ◽  
Iron Based ◽  
Image Position

Abstract

Study on the Low Cycle Fatigue Damage of Nodular Cast Iron Based on Elastic Modulus

2006 ◽  
Vol 324-325 ◽  
pp. 851-854
Author(s):  
Jin Hai Liu ◽  
Xiao Yan Hao ◽  
Guo Lu Li ◽  
Xue Bo Zhao ◽  
Gen Sheng Liu
Keyword(s):  
Cast Iron ◽  
Elastic Modulus ◽  
Fatigue Damage ◽  
Low Cycle Fatigue ◽  
Nodular Cast Iron ◽  
Damage Variable ◽  
Cycle Fatigue ◽  
Sensitive Parameter ◽  
Nodular Iron ◽  
Iron Based

The influence of fatigue ratio on the low cycle fatigue damage of nodular cast iron was investigated by measuring the elastic modulus. The results indicated that the elastic modulus of nodular cast iron is a sensitive parameter to the fatigue damage at low cycle. The fatigue damage variable of nodular cast iron increases with cycle ratio. At the beginning and end period of cycling, the damage of nodular iron increases sharply, and in the range of 0.2- 0.8 cycle ratio, the fatigue damage grows gradually.

scholarly journals Electrodeposition of Photocatalytic Sn–Ni Matrix Composite Coatings Embedded with Doped TiO2 Particles

Coatings ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 775
Author(s):  
Eleni Rosolymou ◽  
Stella Spanou ◽  
Caterina Zanella ◽  
Dimitris S. Tsoukleris ◽  
Susanne Köhler ◽  
...  
Keyword(s):  
Current Density ◽  
Structural Characteristics ◽  
Composite Coatings ◽  
Applied Current ◽  
Alloy Matrix ◽  
Applied Current Density ◽  
Tio2 Particles ◽  
Nano Crystalline ◽  
Density Values ◽  
Tin Content

Direct current electrodeposited Sn–Ni/TiO2 nanostructured coatings were produced by embedding two different doped types of TiO2 particles within the alloy matrix, a commercially available doped carbon-based and doped N,S-TiO2 particles. The structural characteristics of the composite coatings have been correlated with the effect of loading, type of particles in the electrolytic bath, and the applied current density. Regardless of the type of doped particles TiO2, increasing values of applied current density resulted in a reduction of the co-deposition percentage of TiO2 particles and an increase of Tin content into the alloy matrix. The application of low current density values accompanied by a high load of particles in the bath led to the highest codeposition percentage (~3.25 wt.%) achieved in the case of embedding N,S-TiO2 particles. X-ray diffraction data demonstrated that in composite coatings the incorporation of the different types of TiO2 particles in the alloy metal matrix modified significantly the nano-crystalline structure in comparison with the pure coatings. The best photocatalytic behavior under visible irradiation was revealed for the composite coatings with the highest co-deposition percentage of doped N,S-TiO2 particles, that also exhibited enhanced wear resistance and slightly reduced microhardness compared to pure ones.

scholarly journals Low Frictional MoS2/WS2/FineLPN Hybrid Layers on Nodular Iron

Coatings ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 293 ◽  
Author(s):  
Pior Kula ◽  
Robert Pietrasik ◽  
Sylwester Pawęta ◽  
Adam Rzepkowski
Keyword(s):  
Wear Resistance ◽  
Cast Iron ◽  
Composite Coatings ◽  
Nodular Cast Iron ◽  
Iron Nitrides ◽  
High Wear Resistance ◽  
Low Friction ◽  
Nodular Iron ◽  
Hybrid Layers ◽  
Interesting Alternative

The paper presents the new concept of low frictional hybrid composite coatings on nodular cast iron. The structure of it is multilayer and consists of MoS2 and/or WS2 nanoinclusions embedded in the iron nitrides’ zone and relatively deep hard diffusion zone. It offers a low friction coefficient as well as high wear resistance of coated parts. The details of technology as well as the mechanism of layer’s growth have been presented and discussed. The presented technology may be an interesting alternative for chromium-based galvanic coatings of piston rings made of nodular iron using Cr6+.

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