Laser Surface Cladding of Al-Si Alloy

2005 ◽  
Vol 297-300 ◽  
pp. 2813-2818 ◽  
Author(s):  
Xun Cai ◽  
Xiaoyu Yang ◽  
Tao Zhao ◽  
Liuhe Li ◽  
Qiu Long Chen
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Laser Scanning ◽  
Sudden Change ◽  
Physical And Mechanical Properties ◽  
Laser Surface ◽  
Chemical Components ◽  
Interface Zone ◽  
Gradient Layer ◽  
Modified Layer

The mixture of Ni based alloy powder and WC particles were used as a feeding material to modify the surface properties of cast Al-Si alloy using a CO2 continuous transverse flow laser beam with maximum power of 10 kW. Microstructures and chemical components of the laser surface cladding (LSC) layers were studied using SEM, XRD, TEM and EDS. It is shown that the LSC layers were composed of γ-（ Ni, Cr, Fe, W）matrix phase and many enhancing phases, such as Ni2Al3, Ni3Al, WC, W2C, Cr2B, etc.. The microstructure of the LSC layers was greatly affected by the scanning rate b V and the powder of feeding rate p m under the same laser power. With the increasing of b V and p m , the dissolution phenomenon of WC particles was improved; the length, the diameter and the amount of the acicular constituent were markedly reduced. Microhardness and wear resistance tests were also performed: the average microhardness of the LSC layers was around 5.1 to 5.9GPa, which was five times higher than that of the Al-Si substrate. The wear resistance of the layer was about 20 times as big as that of cast Al-Si alloy when P=6kW, b V =13.3mm s-1, p m =100mg s-1, L=500N. The results showed that the mechanical properties of LSC layers on cast Al-Si alloy can be markedly enhanced with proper processing parameters. However, due to the sudden change of physical and mechanical properties between laser modified layer and substrate, some defects, especially crack, actually occur in the surface modified layer and the interface zone. And finally Ni/WC surface gradient layer was obtained on cast Al-Si alloy through thrice laser scanning technique. The microhardness of the laser gradient layer gradually changed from surface to substrate, so that it can reduce stress concentration in the whole laser surface layer, especially in the interface zone.

scholarly journals Physical, mechanical properties and wear resistance of iron-base matrix materials for sintered diamond tools fabricated by HP and SPS

Mechanik ◽  
2018 ◽  
Vol 91 (10) ◽  
pp. 846-849
Author(s):  
Elżbieta Bączek
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Metal Matrix ◽  
Physical And Mechanical Properties ◽  
Full Density ◽  
Matrix Composites ◽  
Plasma Sintering ◽  
Base Matrix ◽  
Spark Plasma ◽  
Sintered Diamond

Metal matrix composites were prepared by hot pressing (HP) and spark plasma sintering (SPS) techniques. Ball-milled ironbase powders were consolidated to near full density by these methods at 900°C. The physical and mechanical properties of the resulting composites were investigated. The specimens were tested for resistance to both 3-body and 2-body abrasion. The composites obtained by HP method (at 900°C/35 MPa) had higher density, hardness and resistance to abrasion than those obtained by SPS method.

Preliminary Research on Manufacturing Technology of Thin Bamboo Veneer Consolidated Composite Floor

2012 ◽  
Vol 503-504 ◽  
pp. 74-77
Author(s):  
Nan Hu ◽  
Xian Jun Li ◽  
Yi Qiang Wu ◽  
Xin Gong Li ◽  
Zhi Cheng Xue
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Bond Strength ◽  
Hot Pressing ◽  
Physical And Mechanical Properties ◽  
Pressing Pressure ◽  
Pressing Temperature ◽  
Decorative Material ◽  
Preliminary Research ◽  
Surface Bond

In this paper, the new bamboo-based consolidated composite floors were fabricated with thin bamboo veneers which used as decoration layers, wear resistant layers, high density fiberboards and equilibrium layers through assembling and scuffing. The effect rules of the composite floor on properties were preliminarily studied by three factors: hot-pressing temperature, pressure and time. The results showed that the wear resistance and surface bond strength of the thin bamboo veneer consolidated composite floor significantly increased with the rise of hot-pressing temperature. In the scope of resources, the effect of hot-pressing pressure and time on properties of the floor is not significant. The optimizing technology is hot-pressing temperature 170°C, pressure 3MPa and time 40s/mm in this study. The thin bamboo veneer consolidated composite floor is an excellent floor decorative material, which has good physical and mechanical properties.

Relationship between Laser Parameters - Microstructural Modification - Mechanical Properties of Laser Surface Melted Magnesium Alloy AZ91D

2013 ◽  
Vol 765 ◽  
pp. 678-682
Author(s):  
Catalina Taltavull ◽  
Belen Torres ◽  
Antonio Julio Lopez ◽  
Joaquin Rams
Keyword(s):  
Mechanical Properties ◽  
Surface Treatment ◽  
Laser Scanning ◽  
High Energy ◽  
Surface Melting ◽  
Laser Surface ◽  
Laser Surface Melting ◽  
Beam Power ◽  
Laser Parameters ◽  
Alloy Az91d

Laser surface melting is a high-energy surface treatment that allows modification of the microstructure and surface properties of Mg alloys. In the present work, a high-power diode laser has been used to study the microstructural and mechanical modifications that occur when laser surface treatments are applied to the surface of the AZ91D Mg alloy. Laser-beam power in a range of 375-600 W and laser scanning speeds of 45-60-90 mms-1 has been used to develop a range of laser surface melting treatments. By controlling the laser parameters, two types of surface modifications can be obtained. Complete laser surface melting takes place at high laser input energies whilst at low laser input energies, selective laser surface melting occurs with modification of only one phase in the microstructure of the alloy; the other phase remained unaffected. In terms of mechanical properties, the microstructural modifications introduced by the laser surface treatment implied a hardness homogenization along the melted region.

Effect of SiC Particle Size on the Physical and Mechanical Properties of NiTi Alloys

2017 ◽  
Vol 907 ◽  
pp. 3-7
Author(s):  
Hülya Akkan ◽  
Mehmet Şi̇mşi̇r ◽  
Kerim Emre Öksüz
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Wear Resistance ◽  
Wear Behavior ◽  
Physical And Mechanical Properties ◽  
Particle Sizes ◽  
Phase Development ◽  
Niti Shape Memory Alloys ◽  
Microstructural Studies ◽  
Sic Particle

NiTi shape memory alloys have attracted significant interest due to their unique superelasticity and high damping performance. In this work, the effect of SiC particle size on both physical and mechanical properties of NiTi matrix composite was investigated. Ni and Ti powders with particle sizes of 40 µm were used with the SiC addition with varying particle sizes of 20 µm and 40 µm, respectively. Composites of NiTi with 1wt. % SiC were fabricated by powder metallurgy technique. The effects of SiCp addition on hardness, relative density and wear behavior of NiTi composites have been investigated. The samples were examined by scanning electron microscope, for microstructural studies and phase development. The results showed that the distribution of the reinforced particle was uniform. Moreover, as the SiC particle size decreases, hardness and wear resistance increase. It was demonstrated that SiC particle size significantly enhanced the wear resistance of NiTi composite.

The Effect of the Laser Surface Treatments on the Wear Resistance

2010 ◽  
Vol 649 ◽  
pp. 107-112 ◽  
Author(s):  
Enikő Bitay ◽  
Tünde Kovács
Keyword(s):  
Wear Resistance ◽  
Surface Hardening ◽  
Laser Scanning ◽  
Base Material ◽  
High Hardness ◽  
Surface Melting ◽  
Laser Surface ◽  
Surface Alloys ◽  
Phase Dispersion ◽  
Treatment Technologies

In case of traditional surface-hardening processes (e.g. carburization), the wear resistance usually correlates with hardness, which means optimising these technologies could be based on testing the achieved hardness. In case of modern laser treatment technologies however – e.g. surface melting combined with surface alloys or laser scanning surface treatment followed by nitridation – it is unlikely to conclude wear resistance from the value of hardness. The reasons are the following: the hardness of surface melting combined with surface alloys (especially if alloyage is made using high hardness compound powders) depends on the remelting of the material and the particle size and distribution of the dispersed alloy. These same properties define wear resistance, but the values don’t necessarily correlate. In case of a compound phase dispersion in a softer base material, we can have outstanding wear resistance with moderate hardness. (e.g. bearing metals) The case is similar with scanning treatment combined with nitridation, which results in complicated structures. Due to the above, it is possible that in order to optimise these aforementioned technologies, we have to rely on examining wear resistance. In order to back this statement, we show the results of two typical experiments concerning these technologies.

scholarly journals PHYSICAL AND MECHANICAL PROPERTIES OF MULTI-ELEMENT COATINGS

2021 ◽  
Vol 7 (2(38)) ◽  
pp. 31-32
Author(s):  
G. A. Zharmagambetova ◽  
I. A. Kudusova ◽  
V. Ch. Laurinas
Keyword(s):  
Thin Films ◽  
Mechanical Properties ◽  
Wear Resistance ◽  
Friction And Wear ◽  
Physical And Mechanical Properties ◽  
Magnetron Deposition ◽  
Nickel Chromium ◽  
High Microhardness

A number of experiments were conducted to measure the physical and mechanical properties of multielement coatings. To apply CrNiTiFeCu coatings on a nickel-chromium substrate, the technology of magnetron deposition in an atmosphere of argon or nitrogen was used. The results of measurements of the microhardness as well as the coefficients of friction and wear resistance of the applied CrNiTiFeCu thin films are presented. The findings indicate that the studied samples show a high microhardness and wear resistance. Consequently, there is a possibility to extend the lifespan of mechanisms and machines parts.

scholarly journals The Effect of Nature and Parameters of Particle Size Distribution of Graphite on Physical and Mechanical Properties of Polimer Composites based on Aromatic Poliamide

2016 ◽  
Vol 17 (4) ◽  
pp. 611-620
Author(s):  
H.O. Sirenko ◽  
L.M. Soltys ◽  
V.P. Svidersky ◽  
I.V. Sulyma
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Wear Resistance ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Physical And Mechanical Properties ◽  
Aromatic Polyamide ◽  
Ash Content ◽  
Natural Graphite ◽  
Distribution Parameters

The resultsof studies of the effect of nature and parameters of particle size distribution of graphite on physical and mechanical properties of polymer composites based on aromatic polyamide fenіlon C-2. The particle size of the filler and polymer for the theoretical gamma-distribution parameters (perimeter, thickness and diameter) have different values. Found the influence of fillers (natural graphite different bands), which differed ash content (5-15% and 0,05-2,5%), moisture and grinding fineness (dispersion) on the wear resistance of the samples of the polymer composite. There is non-linear connectionbetween the intensity and parameters graphite particles distribution.

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