scholarly journals Development of Novel Lightweight Metastable Metal–(Metal + Ceramic) Composites Using a New Powder Metallurgy Approach

Materials ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3283 ◽  
Author(s):  
Khin Sandar Tun ◽  
Akshay Padnuru Sripathy ◽  
Sravya Tekumalla ◽  
Manoj Gupta
Keyword(s):  
Powder Metallurgy ◽  
Synthesis Method ◽  
Ceramic Composites ◽  
Advanced Materials ◽  
Synthesis Process ◽  
Powder Metallurgy Method ◽  
Scanning Calorimetry ◽  
Intermetallic Formation ◽  
Metal Metal ◽  
Metal Ceramic

In the current study, metal–(metal + ceramic) composites composed of biocompatible elements, magnesium (Mg), zinc (Zn), calcium (Ca) and manganese (Mn) were synthesized using a sinter-less powder metallurgy method. The composite has a composition of Mg49Zn49Ca1Mn1 (wt.%) in which the compositional ratio between Mg and Zn was chosen to be near eutectic Mg-Zn composition. The synthesis method was designed to avoid/minimize intermetallic formation by using processing temperatures lower than the Mg-Zn binary eutectic temperature (~ 340 °C). The synthesis process involved extrusion of green compacts at two different temperatures, 150 °C and 200 °C, without sintering. Extrusion was performed directly on the green compacts as well as on the compacts soaked at temperatures of 150 °C and 200 °C, respectively. Microstructure and mechanical properties of the materials synthesized under various processing conditions were investigated. Effect of extrusion temperature as well as soaking temperature on the materials’ properties were also evaluated in details and different properties showed an optimum under different conditions. All the synthesized materials showed no evidence of intermetallic formation which was confirmed by SEM/EDS, XRD, and Differential Scanning Calorimetry (DSC) techniques. The study establishes development of unconventional metal–(metal + ceramic) eco-friendly composites and provides important insight into realizing certain properties without using sintering step thus to minimize the energy consumption of the process. The study also highlights the use of magnesium turnings (recyclability) to develop advanced materials.

The Coefficient of Thermal Expansion of a Super Invar-Ta16W18O94 Composite

1986 ◽  
Vol 108 (3) ◽  
pp. 270-274 ◽  
Author(s):  
C. N. Chu ◽  
N. Saka ◽  
N. P. Suh
Keyword(s):  
Thermal Expansion ◽  
Powder Metallurgy ◽  
Coefficient Of Thermal Expansion ◽  
Ceramic Composites ◽  
Volume Percent ◽  
Temperature Range ◽  
Metal Ceramic

The coefficient of thermal expansion (CTE) of a hot pressed Ta16W18O94 which was produced from Ta2O5 and WO3 powders was found to be −1.52×10−6 K−1 in the temperature range 180–330 K. Using the Ta16W18O94 and Super Invar powders, 50:50 volume percent metal-ceramic composites were made by the powder metallurgy techniques. When the mixture of constituent powders was hot pressed at 1123 K for 10 minutes, a CTE of 1.1 × 10−6 K−1 was obtained in the temperature range 140–420 K.

Effect of Sintering Aids Sorts on Properties of Prepared Al2O3-Al Cermet

2018 ◽  
Vol 281 ◽  
pp. 297-302 ◽  
Author(s):  
Rui Hua Wang ◽  
Xiao Bo Bai ◽  
Xiao Dong Jiang ◽  
Deng Liang Yi ◽  
Fang Wang ◽  
...  
Keyword(s):  
Powder Metallurgy ◽  
Bonding Strength ◽  
Sintered Density ◽  
Surface Hardness ◽  
Ceramic Materials ◽  
Alumina Powder ◽  
Powder Metallurgy Method ◽  
Sintering Aids ◽  
Metal Ceramic ◽  
Better Than

Cermet while maintaining the excellent properties of ceramic materials, but also have the advantages of a metal material, is an important new engineering materials. In this paper, Al-Al2O3 cermet is prepared adding different sintering aids via the powder metallurgy method to study the properties of Al-Al2O3 cermet. The conclusions are shown the adding sintering aids can significantly improve the sintered density of Al-Al2O3 cermet. The sintering aiding effect of adding MgO is better than that of SiO2 and Y2O3, and the hardness and the strength of the sample are higher than those of samples with SiO2 and Y2O3, and the densification degree of Al-Al2O3 metal ceramic material is the best, the relative density is 94.8%, the surface hardness is 824HV. The flatness of the surface of the sample adding MgO shows that the bonding strength between aluminum powder and alumina powder is high. The prepared Al-Al2O3 cermet adding different sintering aids have higher density and fewer pores in the microstructure the prepared Al-Al2O3 cermet adding sintering aids has a package structure.

Microwave melting and processing of metal–ceramic composite castings

2016 ◽  
Vol 232 (7) ◽  
pp. 1235-1243 ◽  
Author(s):  
Satnam Singh ◽  
Dheeraj Gupta ◽  
Vivek Jain
Keyword(s):  
Microwave Heating ◽  
Ceramic Composite ◽  
Ceramic Composites ◽  
Advanced Materials ◽  
X Ray Diffraction ◽  
Uniform Dispersion ◽  
Metal Ceramic ◽  
The Cost ◽  
Equiaxed Grain ◽  
Structure Properties

Applications of metal–ceramic composites are increasing in advanced materials field; however, efficient utilization of these materials depends on the cost involved in processing and structure–properties correlations. Processing of materials through microwave energy has already been accepted as a well-established route for many materials. In this work, composites of nickel-based metallic powder (matrix) and SiC powder (reinforcement) were successfully casted by microwave heating. The mechanism for the development of composite castings using microwaves is discussed with proper illustrations. The results of microstructure analysis of the developed cast revealed that uniform equiaxed grain growth with uniform dispersion of reinforcement. The results of X-ray diffraction analysis revealed that during microwave heating some metallurgical changes took place, which led to higher microhardness of cast. Micowave processed casting revealed lower defects (~1.75% porosity) and average Vickers microhardness of 920 ± 208 HV. This work reports the successful applications of microwaves in manufacturing, in the form of melting and casting of metallic powders.

Thermal Residual Stresses Generated during Processing of Cr-Al2O3 Composites and their Influence on Macroscopic Elastic Properties

2010 ◽  
Vol 65 ◽  
pp. 27-32 ◽  
Author(s):  
Witold Weglewski ◽  
Marcin Chmielewski ◽  
Dariusz Kaliński ◽  
Katarzyna Pietrzak ◽  
Michal Basista
Keyword(s):  
Powder Metallurgy ◽  
Elastic Properties ◽  
Thermal Stresses ◽  
Ceramic Composites ◽  
Measured Data ◽  
Fem Model ◽  
Thermal Residual Stresses ◽  
Al2o3 Composite ◽  
Model Predictions ◽  
Metal Ceramic

This work is focused on the modeling of thermal stresses induced during the fabrication of the metal/ceramic composites. On example of Cr-Al2O3 composite processed by powder metallurgy, thermal stresses after fabrication are determined by FEM model for different contents of metal and ceramic phases. Numerical model of microcracking induced by thermal stresses is then proposed and applied to compute the overall elastic properties of the damaged composite. Comparison of the model predictions with the measured data for Young's modulus is presented.

Advances in Ultrasonic Disk Cutting and Precision Dimpling

1991 ◽  
Vol 254 ◽  
Author(s):  
Paul E. Fischione ◽  
Thomas F. Kelly ◽  
Amber M. Dalley ◽  
Louis M. Holzman ◽  
David Dawson-Elli
Keyword(s):  
Electronic Devices ◽  
Ceramic Composites ◽  
Advanced Materials ◽  
Single Specimen ◽  
Ion Milling ◽  
Analytical Results ◽  
Metal Ceramic ◽  
Made In

AbstractMany of today's advanced materials are prepared using a combination of ultrasonic disk cutting, dimpling, and ion milling. In order to optimize the analytical results from a single specimen, several improvements have been made in instrumentation for ultrasonic disk cutting. Also, a system has been developed for detecting either at or near-electron transparency in TEM specimens. Both of these aspects are described. Examples are provided for silicon, metal/ceramic composites and blanket substrate layers for electronic devices.

scholarly journals Effect of Hydroxyapatite Nano Rods on Sinterability and Bioactivity of Fe-14Mn-6Si Alloy Prepared By Powder Metallurgy

2021 ◽  
Author(s):  
M F Zawrah ◽  
Ibrahim M. Hassab Allah ◽  
Ayman R. Abdellah Awad ◽  
Moataz Bellah H. Ata
Keyword(s):  
Powder Metallurgy ◽  
Bulk Density ◽  
Sintering Temperature ◽  
Ceramic Composites ◽  
Porous Bodies ◽  
Metal Ceramic ◽  
Different Temperatures ◽  
Nano Rods ◽  
Hardness Values ◽  
Composite Properties

Abstract Recently, there is a great of industrial interest on the production of biodegradable metal/ceramic composites. The casted Fe-Mn-Si alloys prepared by casting tools have low biodegradable rate; so it is important to seek a method as powder metallurgy (PM) to prepare porous bodies with increased biodegradability. Moreover, the addition of hydroxyapatite (HA) nano rods to that alloy increases its bioactivity and forms composite with improved properties. In the present study, Fe-14Mn-6Si/HA composites were prepared by PM and sintered at different temperatures, i.e. 1100, 1150 and 1200oC. Also, the effect of HA nano-rods content on the composite properties (physical properties, microstructure and micro hardness) and bioactivity were studied. The results revealed that bulk density increased with increasing sintering temperature up to 1150oC; then decreased at 1200oC. Also, the bulk density increased with increasing the HA content. Moreover, the hardness of the sintered composites increased with increasing sintering temperature and HA amount. The maximum hardness values were 1293 & 1792 MPa for the specimens which contain 8 % HA and sintered at 1150 and 1200oC, respectively. The bioactivity of the prepared composites increased with increasing HA amount. The highest bioactivity was for the composite that contains 8 wt.% HA.

Mechanical and Structural Characterization of Cu-Ni-Ag/Y2O3 Composites Obtained by Powder Metallurgy

2012 ◽  
Vol 727-728 ◽  
pp. 314-319
Author(s):  
Anderson Kenji Okazaki ◽  
Marcos Vinícios Surmani Martins ◽  
Marcelo Carvalhal ◽  
Waldemar Alfredo Monteiro ◽  
Juan Alfredo Guevara Carrió
Keyword(s):  
Powder Metallurgy ◽  
Alternative Energy ◽  
Electrode Materials ◽  
Copper Alloys ◽  
Metallic Copper ◽  
Ceramic Composites ◽  
Scanning Calorimetry ◽  
Cell Parameters ◽  
Alternative Energy Sources

Metal-ceramic composites are recently being used as electrode materials in solid oxide fuel cell (SOFC), which have received much attention as alternative energy sources. In this work cermets of Cu-Ni-Ag/Y2O3 were synthesized with different quantities of Ni and Ag. Various samples were prepared from pure precursors by conventional powder metallurgy processing and sintered at 800°C. The characterization by differential scanning calorimetry (DSC) and thermal gravimetric analyze (TGA) indicate that the presence of Y2O3 could increase the corrosion resistance of the metallic copper alloys. The copper crystalline structure presents internal strengths and possibly crystallites with different cell parameters due to the effect of thermal and mechanical treatments in presence of Y2O3. The highest electrical conductivity and highest hardness were obtained for the composition with 5% Y2O3 and 5% nickel, which increases the hardness and could contribute to the higher conductivity through a precipitation mechanism.

Biomimetic materials: An introduction

1992 ◽  
Vol 50 (2) ◽  
pp. 1020-1021 ◽  
Author(s):  
M. Sarikaya ◽  
J. T. Staley ◽  
I. A. Aksay
Keyword(s):  
Self Assembly ◽  
Structural Control ◽  
Hierarchical Structures ◽  
Ceramic Composites ◽  
Advanced Materials ◽  
Length Scale ◽  
Spider Webs ◽  
Biomimetic Materials ◽  
Synthetic Materials ◽  
All Ceramic

Biomimetics is an area of research in which the analysis of structures and functions of natural materials provide a source of inspiration for design and processing concepts for novel synthetic materials. Through biomimetics, it may be possible to establish structural control on a continuous length scale, resulting in superior structures able to withstand the requirements placed upon advanced materials. It is well recognized that biological systems efficiently produce complex and hierarchical structures on the molecular, micrometer, and macro scales with unique properties, and with greater structural control than is possible with synthetic materials. The dynamism of these systems allows the collection and transport of constituents; the nucleation, configuration, and growth of new structures by self-assembly; and the repair and replacement of old and damaged components. These materials include all-organic components such as spider webs and insect cuticles (Fig. 1); inorganic-organic composites, such as seashells (Fig. 2) and bones; all-ceramic composites, such as sea urchin teeth, spines, and other skeletal units (Fig. 3); and inorganic ultrafine magnetic and semiconducting particles produced by bacteria and algae, respectively (Fig. 4).

Role of Aluminium on the Microstructure and Corrosion Behaviour of Magnesium Prepared by Powder Metallurgy Method

2020 ◽  
Vol 17 (3) ◽  
pp. 8206-8213
Author(s):  
J. Alias
Keyword(s):  
Corrosion Resistance ◽  
Powder Metallurgy ◽  
Corrosion Behaviour ◽  
Corrosion Current ◽  
Optical Microscope ◽  
High Reactivity ◽  
Aluminium Content ◽  
Powder Metallurgy Method ◽  
X Ray Diffraction ◽  
Promising Development

Much research on magnesium (Mg) emphasises creating good corrosion resistance of magnesium, due to its high reactivity in most environments. In this study, powder metallurgy (PM) technique is used to produce Mg samples with a variation of aluminium (Al) composition. The effect of aluminium composition on the microstructure development, including the phase analysis was characterised by optical microscope (OM), scanning electron microscopy (SEM) and x-ray diffraction (XRD). The mechanical property of Mg sample was performed through Vickers microhardness. The results showed that the addition of aluminium in the synthesised Mg sample formed distribution of Al-rich phases of Mg17Al12, with 50 wt.% of aluminium content in the Mg sample exhibited larger fraction and distribution of Al-rich phases as compared to the 20 wt.% and 10 wt.% of aluminium content. The microhardness values were also increased at 20 wt.% and 50 wt.% of aluminium content, comparable to the standard microhardness value of the annealed Mg. A similar trend in corrosion resistance of the Mg immersed in 3.5 wt.% NaCl solution was observed. The corrosion behaviour was evaluated based on potentiodynamic polarisation behaviour. The corrosion current density, icorr, is observed to decrease with the increase of Al composition in the Mg sample, corresponding to the increase in corrosion resistance due to the formation of aluminium oxide layer on the Al-rich surface that acted as the corrosion barrier. Overall, the inclusion of aluminium in this study demonstrates the promising development of high corrosion resistant Mg alloys.

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