High Temperature Thermoelectric Properties of ZnO
For Al Ga dually doped ZnO the spark plasma sintering conditions together with the microstructural evolution and thermoelectric properties of the samples were investigated in detail A proposed solid state reaction model suggested that a sintering temperature above 1223K would be preferable in order to achieve phase equilibrium in the samples
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Sintering of Ice Spheres under Different Thermal Conditions
ice spheres which simulated the sintering condition occurring in the daily cycles of radiative heating and cooling in the topmost 20 cm of the snow layer 2 Spherical ice spheres were produced by freezing 0oC deionized degassed water droplets in liquid nitrogen
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A novel method based on selective laser sintering for
A novel method based on selective laser sintering SLS process is proposed for the first time to prepare complex and high performance carbon
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Sintering Induced Phase Transformation of Nanoparticles
Sintering Induced Phase Transformation of Nanoparticles A Molecular Dynamics Study Qian Mao 1 Yihua Ren 2 Kai H Luo 1 3 Shuiqing Li 2 1 Center for Combustion Energy Key Laboratory for Thermal Science and Power Engineering of
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Sintering Mechanisms of Convention Nanodensification and
Sintering process studies have re emerged strongly in the past decade due to extensive discussions about the stabilization of nanoparticles and nanostructures and the development of controlled nanograined bulk materials This book presents the state of art in experiments and theory of novel sintering processes traditional sintering and grain
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Development of a DEM taking account of neck increments
The sintering force is expressed as 4 F sint = π γ s 4 R 1 c o s ψ 2 a s i n ψ 2 The resistance force is expressed as 5 F v = η v rn where v rn is the normal relative velocity between particles and η is the viscosity given by 6 η = π a 4 k T 8 δ g D g Ω The contact stiffness in the viscoelastic sintering model was set to 7 10 5 N/m as adopted by Nosewicz
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Cold Sintering of Na2WO4 Ceramics using a Na2WO4 2H2O
In the cold sintering process of Na 2 WO 4 several important parameters could affect the qualities of final product such as temperature pressure process time and so on Fig 1b–1d show the relative densities of Na 2 WO 4 ceramics as a function of temperature pressure and process time As can be seen in Fig 1b when the temperature is ≤ 80 °C the relative density is less than 90
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A Handling And Placement Device For Sintering Plant
The present invention relates to a handling and placement device for sintering plant ignition hood refractory cast beams avoiding the limitation of EOT crane approach over ignition hood The device involves a roller table which has been fabricated and fixed over a pair of horizontal beams placed on
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A Handling And Placement Device For Sintering Plant
The present invention relates to a handling and placement device for sintering plant ignition hood refractory cast beams avoiding the limitation of EOT crane approach over ignition hood The device involves a roller table which has been fabricated and fixed over a pair of horizontal beams placed on
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A Newly Developed Easily Sinterable Low Alloy Steel
A Newly Developed Easily Sinterable Low Alloy Steel Powder been shown that the experimental powder can be consolidated to a closed porosity condition >95 theoretical density by pressure less sintering at a temperature below 900 C The as consolidated
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Non conventional sintering techniquesEPMA
Liquid phase sintering LPS is a process for forming high performance multiple case the newly formed liquid penetrates between the solid grains dissolves the sinter bonds and induces grain rearrangement condition with solubility being a dominant factor
Get PriceBearings for Steel IndustryNSK
Sintering equipment 1 Operating conditions 2 Problems 3 Countermeasures3 Countermeasures Features Sealed Clean Bearings for Pallet Wheels AR Series Features Sealed Clean Bearings for Inboard Rollers 2J Series AR 2J Newly developed structure 1 2 5 on average 3 at maximum Conventional structure Newly developed structure
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Condition for sintering of a newly lined furnace with
Condition for sintering of a newly lined furnace with neutral ramming mass 1 Add ferronickel or top crops and back end crops to the bottom of the furnace the center must be flattened sintering can be started when the furnace is half full 2 When sintering the voltage should start from 100kw
Get PricePredictive Iterative Learning Control with Data Driven
Wroe et al and 6 Taylor et al identified that 7 for quality purposes the post sintering temperatures of the newly sintered 2D geometries need to be above a specific post sintering threshold temperature which is unique for the employed powder material 10 The reason the condition depends on the previous two layers
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Optimization of Sintering Conditions for Improvement of
Sintering temperature are controlled between 1150 °C and 1300 °C through which pores are interconnected and compressive strength is above 100 MPa Both total porosity and apparent porosity are measured and shown in Figure 5
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Reaction sintered silicon carbide newly developed
These processes may generally include complicated fabrication steps to obtain good optical surface for example sintering machining CVD and polish New attractive fabrication process high strength reaction sintering process has developed to obtain high performance SiC optical substrate Two years study in TOSHIBA and NEC TOSHIBA Space Systems revealed that high strength RS SiC we
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A Newly Developed Easily Sinterable Low Alloy Steel
A Newly Developed Easily Sinterable Low Alloy Steel Powder been shown that the experimental powder can be consolidated to a closed porosity condition >95 theoretical density by pressure less sintering at a temperature below 900 C The as consolidated
Get PriceImprovement of recycle rate in laser sintering by low
newly added material is almost equivalent to the amount of material consumed as a product In deterioration of powder during process powder bed preheating plays a dominating role In laser sintering powder bed temperature is maintained in a range between melting and recrystallization temperature which is called process window
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Sintering Induced Phase Transformation of Nanoparticles
arrangement During the sintering of two unequal sized nanoparticles amorphous and core shell anatase atoms from the nanoparticleamorphous first nucleate to form crystal anatase in the contact region and a grain boundary is then developed between the original core region and the newly formed anatase After that phase crystal
Get PriceLaser sintering of metal powders on top of sintered layers
The sintering depth will pierce into the previously sintered layers below so that the newly sintered layer can be bound to the existing layer to form an integrated resolidified region The overlap between layers is defined as the ratio of the width of the liquid pool at the bottom surface of the fresh layer and that of the liquid pool at the
Get PriceHigh bonding strength of silver sintered joints on non
In this paper we extended our study to semiconductor devices attachment on non precious metal surfaces by pressure sintering process in air atmosphere We attached Ag metallized Si dies on direct copper bonding substrates with nickel plated and without plating as well as on aluminum plate by silver sintering process at 250 °C with a pressure of 10 MPa for 3 min using a newly developed silver
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Marginal and internal fit of cobalt chromium copings
The newly developed direct metal laser sintering DMLS system is an additive metal fabrication technology Based on information received from three dimensional 3D computer aided design and using a data file metal powder is shot selectively and fused with a laser to laminate approximately a 20–60 μm thick layer with each shooting to
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Crystallization Behavior of the Low Temperature
According to the XRD patterns against the sintering time in comparison with the XRD patterns of BGNPs the crystalline peaks were first observed in LMSP0 5h Figure 4 Then after sintering for 2 to 12 h the main peak of HAp PDF no was clearly separated at 2θ = 32 01° and assigned to the 211 diffraction peak
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INVITED REVIEW Cold sintering Current status and
10 vol 12–28 During cold sintering the liquid phase becomes the medium for mass transport Consequently this liquid should be pre loaded with the cation and anion species that comprise the solid in solution or the solid particles should exhibit finite congruent solubility in it While water is the most common cold sintering liquid
Get PriceHigh bonding strength of silver sintered joints on non
Owing to its superb properties such as high melting temperature high thermal and electrical conductivity silver sintering is considered as a promising die attach technology in recent years for high power electronics packaging with demanding requirements such as high power density high current capacity and high operating temperature Our previous studies have demonstrated the feasibility of
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Identification of the initial stage sintering mechanism a
Experimental data showing the reduction in specific surface area during isothermal sintering are analyzed in terms of a previously proposed model Published data on Al 2
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A novel method based on selective laser sintering for
A novel method based on selective laser sintering SLS process is proposed for the first time to prepare complex and high performance carbon
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Synthesis of the MAX Phases by Pulse Discharge Sintering
As an invited paper with the designated title to this focused session this is to introduce the pulse discharge sintering process applied for the sintering and/or synthesis of a few representative MAX phases such as Ti 3 SiC 2 Ti 3 AlC 2 Ti 2 AlC Ti 2 AlN Cr 2 AlC Cr 2 GaC Ti 2 GaC as well as the MAX based solid solutions and some composites The effects of processing parameters on the
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Piezoelectric properties of low temperature sintering in
In this study in order to develop low temperature sintering ceramics for a multilayer piezoelectric transformer application we explored CuO and Bi 2 O 3 as sintering aids at low temperature 900 °C sintering condition for Sb Li and Mn substituted 0 8Pb Zr 0 48 Ti 0 52 O 3 0 16Pb Zn 1/3 Nb 2/3 O 3 0 04Pb Ni 1/3 Nb 2/3 O 3 ceramics These substituted ceramics have excellent piezoelectric
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SELF REGULATING BEHAVIOR OF FERROMAGNETIC
IN INDUCTIVE SINTERING PROCESS L S BULATOVA AND A V DMITRIEV Inst for High Frequency Currents Dept of Inductive Heating of Metals Pargolovo 194902 Leningrad U S S R ABSTRACT A physical model is presented to describe solid phase sintering of pressed ferromagnetic powders under conditions of self organization
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The bonding properties of various surface finishes with Cu
Sintering temperature was 280°C in N 2 The sintering time and pressure are different in each condition Ni/Au substrate was 5 minutes with 9 MPa pressure Ni plated substrate was 20 minutes with 15 MPa After sintering all the samples were evaluated by sound acoustic tomography SAT and shear strengths were measured
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How to do the EAF sintering
The new furnace is usually to do the sintering for and removing moisture The basic electric arc furnace is composed of magnesia dolomite asphalt tar and other materials
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Development of a Master Sintering Curve for Al Mg Alloy
A new master sintering curve MSC is proposed for Al Mg alloy in order to effectively design the pressure assisted sintering process In this work hot pressing experiments of Al Mg alloy powders are performed The changes of relative density during hot pressing are measured for the various heating rates of 5°C/min 10°C/min and 20°C/min at the fixed pressure of 50 MPa
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Laser sintering of metal powders on top of sintered layers
Bonding also occurs between layers as the new layer is sintered i e the overlap between newly sintered layer and existing sintered layer below is considered The sintering depth will pierce into the previously sintered layers below so that the newly sintered layer can be bound to the existing layer to form an integrated resolidified region
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Cold Sintering of Na2WO4 Ceramics using a Na2WO4 2H2O
Actually the natural scenario that the newly fallen snow bonds to form ice is a cold version of sintering where water in both liquid and solid forms coexist at ∼ 0 °C Similarly some inorganic powders are easy to react with water to form hydrates which can be utilized to assist the densification during cold sintering
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Improvement of magnetization of submicron sized high
We newly synthesized cubic hematite powder which has tolerance for the sintering of particles in a hydrogen reduction treatment The aggregation of submicron sized Sm 2 Fe 17 N 3 particles was significantly reduced by using the cubic hematite as a precursor and the magnetization was improved without decreasing the high coercivity
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