Effect of nano ZrO2 on strengthening and electrical properties of Cu-matrix nanocomposits prepared by mechanical alloying

Copper (Cu)-based nanocomposites were produced by mechanical alloying process using various volume percentages of graphene up to 8 vol.%. Subsequently, nanocomposites powders were milled for 20 h, cold-pressed and subjected to different sintering temperatures up to 850 °C for 1 h in argon atmosphere. Furthermore, X-ray diffraction technique along with transmission electron microscopy (TEM) was employed to examine the milled powders. The microstructure, physical, mechanical, electrical properties and wear behavior of the sintered nanocomposites samples were determined also. The obtained TEM micrographs showed homogenous distribution of graphene in Cu matrix and noticed grains refinement. Additionally, it was responsible for measurable decreases in the densification and the electrical conductivity of the sintered bodies. Furthermore, the mechanical properties, on the contrary to work-hardening capacity, of the sintered samples were improved by the increasing in graphene contents and sintering temperatures. The weight loss and wear rate of nanocomposites reduced with both of graphene content and sintering temperature, while increased with increasing in the applied load. Taking all these results into consideration, we can conclude that Cu-graphene nanocomposites are promising candidates for industrial applications.

Preparation of high strength graphene reinforced Cu-based nanocomposites via mechanical alloying method: microstructural, mechanical and electrical properties

Recently, a growing interest has been dedicated towards improving the properties of Al alloys for use in various industrial applications. In this sense, mechanical alloying technique followed by sintering process at 460 and 560 °C in argon atmosphere was used to prepare Al2024 alloy matrix nanocomposites-reinforced by different graphene contents up to 2 wt%. Both XRD technique and TEM were employed to characterize the prepared nanocomposites powders. Microstructure analysis was performed on the sintered composites using SEM. Moreover, the relative density, corrosion rate, thermal expansion and electrical properties of the sintered nanocomposites were measured. Furthermore, their mechanical properties were measured with ultrasonic non-destructive technique. SEM and TEM micrographs revealed a uniform distribution of graphene in the Al alloy matrix. The relative density, coefficient of thermal expansion (CTE) and electrical conductivity of the specimens sintered at 460 °C decreased until reached 90.9%, 13.6 × 10−6/°C and 8.41 × 105 S/m, respectively as the graphene content increased to 2 wt%, while they increased to 93.8%, 1.5 × 10−6/°C and 4.20 × 106 S/m as the sintering temperature increased to 560 °C. On the other hand, the mechanical properties of the nanocomposites such as microhardness, elastic modulus and yield strength were enhanced to 155, 134 and 97%, respectively after adding 2 wt% graphene and sintering at 560 °C. Additionally, the corrosion rate decreased from 5.74 to 2.73 and 5.34 to 2.59 for the sample having 2 wt% graphene and sintered at 460 and 560 °C with increased the exposure from 24 to 144 h, respectively.

Effect of graphene nanoparticles on the physical and mechanical properties of the Al2024-graphene nanocomposites fabricated by powder metallurgy

Sliding wear and solid-particle erosion resistance of a novel high-tungsten Stellite alloy

A metal-based matrix is usually used for the fabrication of diamond bits in order to achieve favorable properties and easy processing. In the effort to reduce the cost and to attain the desired bit properties, researchers have brought more attention to diamond composites. In this paper, Fe-based impregnated diamond composites for drill bits were fabricated by using a pressureless infiltration sintering method at 970 °C for 5 min. In addition, boron was introduced into Fe-based diamond composites. The influence of boron on the density, hardness, bending strength, grinding ratio, and microstructure was investigated. An Fe-based diamond composite with 1 wt % B has an optimal overall performance, the grinding ratio especially improving by 80%. After comparing with tungsten carbide (WC)-based diamond composites with and without 1 wt % B, results showed that the Fe-based diamond composite with 1 wt % B exhibits higher bending strength and wear resistance, being satisfactory to bit needs.

/pdf/fabrication-of-fe-based-diamond-composites-by-pressureless-2lpy36dp8u.pdf

Fabrication of Fe-Based Diamond Composites by Pressureless Infiltration.

The aim of this study was to investigate the effect of sintering temperature and boron carbide content on wear behavior of diamond cutting segments. For this purpose, the segments contained 2, 5 and 10 wt.% B4C were prepared by hot pressing process carried out under a pressure of 35 MPa, at 600, 650 and 700 °C for 3 minutes. The transverse rupture strength (TRS) of the segments was assessed using a three-point bending test. Ankara andesite stone was cut to examine the wear behavior of segments with boron carbide. Microstructure, surfaces of wear and fracture of segments were determined by scanning electron microscopy (SEM-EDS), and X-ray diffraction (XRD) analysis. As a result, the wear rate decreased significantly in the 0-5 wt.% B4C contents, while it increased in the 5-10 wt.% B4C contents. With increase in sintering temperature, the wear rate decreased due to the hard matrix.

/pdf/effect-of-sintering-temperature-and-boron-carbide-content-on-4jpxp515r0.pdf

Effect of Sintering Temperature and Boron Carbide Content on the Wear Behavior of Hot Pressed Diamond Cutting Segments

/pdf/investigation-of-the-usability-of-cubic-boron-nitride-14t6wpqvpp.pdf

Investigation of the Usability of Cubic Boron Nitride Cutting Tools as an Alternative to Diamond Cutting Tools for the Aircraft Industry

This study describes the investigation of wear characteristics of circular cBN/diamond saws produced by hot pressing. In order to determine the usability of cBN instead of diamond, cBN and diamond grains were added to the bronze matrix. Production of the saws was performed at a sintering temperature of 600-700 °C for a sintering time of 3 minutes. Sawing tests were carried out to determine the wear characteristics of the saws by sawing natural stone. It is concluded that cBN together with diamond could be added to the matrix with a concentration of 12 (the rest of concentration of 30 is diamond) and that the saws will have more wear if this concentration is exceeded. After sawing, SEM analyses of the saws indicate that there were more fractures and wear in cBN grains in comparison to the diamond grains. The results concluded that cBN can be used to saw softer natural stones, or can be added to the matrix together with diamond.

Wear Characteristics of Circular cBN/Diamond Saws Produced by Hot Pressing

In this study, a series of Co–Cr–Mo alloys with varying Cr contents were produced by powder metallurgy technique, and the effects of Cr content on microstructure and abrasive wear behaviour were studied. Seven different powder compositions having 15–35 wt-%Cr were used in the experiments. Homogeneously blended powders were cold compacted in a 120 kN single action press. The sintering process was carried out at 1200°C for 60 min in an argon atmosphere. The effects of Cr on the microstructure and abrasion wear performance of the produced powder metallurgy alloys were investigated using SEM, energy dispersive spectroscopy and abrasion wear tests. Abrasive wear resistances were observed to have been increasing up to 27·5 wt-%Cr addition and decreasing subsequently.

Effect of Cr content on microstructure and abrasive wear behaviour of Co-based alloys

In this study, the hardfacing behavior of Cr – Ni stainless steel was studied by depositing of Stellite 1, Stellite 6, and Stellite 12 superalloys on Cr – Ni stainless steel specimens using electric arc welding and tungsten inert gas welding. The cobalt base alloys were hardfaced on stainless steel plates as a single layer. The samples taken from the hardfaced materials were studied by optical microscopy, scanning electron microscopy, X-ray diffraction, and microhardness measurements. The hardness and wear resistance values of the layer obtained after the hardfacing processes are satisfactory and the process seem to be suitable for application.

Hardfacing behavior of Cr-Ni stainless steel with Co-based super alloys

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