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.

Synthesis and Characterization of Porous ZrO2-Y2O3-TiO2 Ceramics Prepared by Coprecipitation

2012 ◽  
Vol 727-728 ◽  
pp. 1387-1392 ◽  
Author(s):  
Luan M. Medeiros ◽  
Fernando S. Silva ◽  
Juliana Marchi ◽  
Walter Kenji Yoshito ◽  
Dolores Ribeiro Ricci Lazar ◽  
...  
Keyword(s):  
Ceramic Composite ◽  
High Strength ◽  
Ceramic Composites ◽  
Rice Starch ◽  
X Ray Diffraction ◽  
Zirconia Ceramics ◽  
Pore Former ◽  
X Ray ◽  
Cold Pressed

Zirconium dioxide (zirconia) ceramics are known by its high strength and toughness and titanium dioxide (titania) ceramics has outstanding surface properties. The ceramic composite formed between the two oxides are expected to have advantages of both ceramics, especially when its surface area is increased by pores. In this work, ceramic composites of ZrO2-Y2O3-TiO2were synthesized by coprecipitation and rice starch was added as pore former in 10, 20 and 30 wt%. Powders were cold pressed as cylindrical pellets and sintered at 1500 °C for 01 hour and ceramics were characterized by techniques as Archimedes method for density measurements, X-ray diffraction and scanning electron microscopy. Results showed that pores are inhomogeneously distributed through ceramic bodies.

Structure Evolution in Al2O3 - ZrO2(Y2O3) Ceramic Composites during Sintering

2010 ◽  
Vol 65 ◽  
pp. 11-15
Author(s):  
Ya. Dyatlova ◽  
S.S. Ordanyan ◽  
Andrey Osmakov ◽  
V. Pesin ◽  
V. Rumyantsev
Keyword(s):  
Mechanical Behavior ◽  
Ceramic Composite ◽  
Large Angle ◽  
Tetragonal Zirconia ◽  
Ceramic Composites ◽  
Structure Evolution ◽  
Composite Ceramics ◽  
X Ray Diffraction ◽  
Composite Powders ◽  
Microstructure Parameters

The paper demonstrates the possibility to control the degree of tetragonal zirconia stabilization, microstructure and physical and mechanical behavior of Al2O3 -ZrO2(Y2O3) ceramic composite. Control is exerted via the process variables during deposition synthesis of nanosized composite powders from hydroxide salts, and their subsequent heat treatment and consolidation. Morphology features of nanosized powder systems and microstructures of the consolidated nanostructured materials were characterized by BET surface are measurements, scanning electron microscopy (both standard and HR), and large-angle X-ray diffraction. Correlations are established between microstructure parameters, physical and mechanical behavior of composite ceramics and a degree of stabilization of tetragonal ZrO2.

Fe–Cr/Al2O3 metal-ceramic composites: Nature and size of the metal particles formed during hydrogen reduction

1994 ◽  
Vol 9 (1) ◽  
pp. 229-235 ◽  
Author(s):  
Ch. Laurent ◽  
J.J. Demai ◽  
A. Rousset ◽  
K.R. Kannan ◽  
C.N.R. Rao
Keyword(s):  
Hydrogen Reduction ◽  
Ceramic Composites ◽  
X Ray Diffraction ◽  
X Ray ◽  
Total Reduction ◽  
Transmission Electron ◽  
Combined Use ◽  
Metal Ceramic ◽  
Different Temperatures ◽  
Metallic Species

Fe-Cr/Al2O3 metal-ceramic composites prepared by hydrogen reduction at different temperatures and for different periods have been investigated by a combined use of Mössbauer spectroscopy, x-ray diffraction, transmission electron microscopy, and energy-dispersive x-ray spectroscopy in order to obtain information on the nature of the metallic species formed. Total reduction of Fe3+ does not occur by increasing the reduction time at 1320 K from 1 to 30 h, and the amount of superparamagnetic metallic species is essentially constant (about 10%). Temperatures higher than 1470 K are needed to achieve nearly total reduction of substitutional Fe3+. Interestingly, iron favors the reduction of chromium. The composition of the Fe-Cr particles is strongly dependent on their size, the Cr content being higher in particles smaller than 10 nm.

Devitrification in SiO2-B2O3-Al2O3-La2O3-TiO2 Glass during the Infiltration of Ceramic Composite

2016 ◽  
Vol 881 ◽  
pp. 77-82
Author(s):  
Afonso Chimanski ◽  
Amanda Martins Jordão ◽  
Paulo Francisco Cesar ◽  
Humberto Naoyuki Yoshimura
Keyword(s):  
Ceramic Composite ◽  
Raw Materials ◽  
Porous Alumina ◽  
Ceramic Composites ◽  
X Ray Diffraction ◽  
Infiltration Process ◽  
X Ray ◽  
Dental Prostheses ◽  
Devitrification Process ◽  
Natural Teeth

Dental prostheses made of ceramic composites infiltrated with glasses have been used due to their biocompatibility and possibility to mimic the natural teeth. In this study, the devitrification behavior of 20SiO2-25B2O3-25Al2O3-15La2O3-15TiO2 glass during the infiltration process in a porous alumina preform was investigated. Glass frits were prepared by melting the raw materials at 1500 °C for 60 min. The glass was infiltrated into the alumina preform at 1,150 or 1,200 °C for 60 min. The specimens were characterized by X-ray diffraction analysis and scanning electron microscopy. After the infiltration, it was possible to note that the devitrification process occurred in the remaining glass (excess glass that did not infiltrate in the preform), forming mostly aluminum borate and mullite crystalline phases. However, within the infiltrated composite no devitrification was noticed in the infiltrated glass. Possible explanations for this behavior are discussed.

X-ray Residual Stress Measurement of Ground Surface of Metal-Ceramic Composite

1990 ◽  
Vol 34 ◽  
pp. 679-687 ◽  
Author(s):  
Zenjiro Yajima ◽  
Yukio Hirose ◽  
Yoichi Kishi ◽  
Kaisuke Tanaka
Keyword(s):  
Residual Stresses ◽  
Ceramic Composite ◽  
Stress Measurement ◽  
Ground Surface ◽  
Diffraction Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Metal Ceramic ◽  
Grinding Conditions ◽  
Machine Parts

Machine parts made of ceramics are usually finished by grinding. Residual stresses as well as defects introduced by grinding will influence the fracture strength and the function of the ceramic parts. Although several investigators measured the grinding residual stresses by the X-ray diffraction method, their grinding conditions were rather limited.

Load Partitioning Study in a 3D Interpenetrating AlSi12/Al2O3 Metal/Ceramic Composite

2013 ◽  
Vol 772 ◽  
pp. 103-107
Author(s):  
Siddhartha Roy ◽  
Jens Gibmeier ◽  
Vladimir Kostov ◽  
Kay André Weidenmann ◽  
Alwin Nagel ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Ceramic Composite ◽  
Bauschinger Effect ◽  
Maximum Stress ◽  
Load Transfer ◽  
The Other ◽  
X Ray Diffraction ◽  
Internal Load ◽  
X Ray ◽  
Metal Ceramic

Internal load transfer in an interpenetrating metal/ceramic composite has been studied in this work using energy dispersive synchrotron X-ray diffraction. One of the samples was loaded in tension and the other one in compression. In each case, the sample was first loaded into the elastic-plastic regime, unloaded to zero stress, and reloaded beyond the prior maximum stress. Results show that at stress amounts greater than 100 MPa aluminum deforms plastically and the load is transferred to alumina and silicon. Unloading and reloading typically show reverse plastic deformation, Bauschinger effect and strain hardening in aluminum.

Internal load transfer in an interpenetrating metal/ceramic composite material studied using energy dispersive synchrotron X-ray diffraction

2019 ◽  
Vol 753 ◽  
pp. 247-252 ◽  
Author(s):  
Siddhartha Roy ◽  
Jens Gibmeier ◽  
Karl Günter Schell ◽  
Ethel Claudia Bucharsky ◽  
Kay André Weidenmann ◽  
...  
Keyword(s):  
Composite Material ◽  
Ceramic Composite ◽  
Load Transfer ◽  
Energy Dispersive ◽  
X Ray Diffraction ◽  
Internal Load ◽  
X Ray ◽  
Ceramic Composite Material ◽  
Metal Ceramic

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.

Analysis of the Analytical and Numerical Studies for Crack Widening in Lamellar Metal-Ceramic Composites

2018 ◽  
Vol 774 ◽  
pp. 385-390
Author(s):  
Romana Piat ◽  
Pascal A. Happ
Keyword(s):  
Thermal Properties ◽  
Analytical Model ◽  
Ceramic Composite ◽  
Ceramic Composites ◽  
Ceramic Layer ◽  
Stress Fields ◽  
Multiple Cracks ◽  
Computational Approaches ◽  
Numerical Studies ◽  
Metal Ceramic

Metal-ceramic composites offer many advantages over monolithic metals and their alloys such as high specific stiffness, strength and good thermal properties. In this paper, stress fields in a single-domain sample of metal-ceramic composite containing multiple cracks in the ceramic layer are investigated. In our previous studies the cracked microstructure for different stage of damage is modeled by analytical and computational approaches. In this paper the assumptions of the analytical model were verified using FE-models for different crack widening.

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