Microstructure Evolution of Solid State Reacted HAp/β-TCP Composite Powders by Post-Treatment Processing

2004 ◽  
Vol 41 (8) ◽  
pp. 582-587
Keyword(s):  
Solid State ◽  
Microstructure Evolution ◽  
Post Treatment ◽  
Composite Powders

Microstructure evolution and growth behavior of rod-shaped ZrB2 in situ preparation of ZrB2-SiC composite powders

2019 ◽  
Vol 45 (3) ◽  
pp. 4016-4021 ◽  
Author(s):  
Yuehua Lin ◽  
Jinghang Liu ◽  
Shaolei Song ◽  
Jingbo Liu ◽  
Sajid Bashir ◽  
...  
Keyword(s):  
Microstructure Evolution ◽  
Growth Behavior ◽  
Composite Powders ◽  
In Situ Preparation

scholarly journals QUANTITATIVE IMAGE ANALYSIS OF MICROSTRUCTURE EVOLUTION DURING SOLID STATE SINTERING OF W-Cu

2011 ◽  
Vol 21 (2) ◽  
pp. 133
Author(s):  
Ana Maria Popa ◽  
JeanMarc Chaix
Keyword(s):  
Solid State ◽  
Microstructure Evolution ◽  
Low Voltage ◽  
Initial Mixture ◽  
Surface Wetting ◽  
Careful Preparation ◽  
Quantitative Image ◽  
Solid State Sintering ◽  
Cu Migration

The microstructure evolution of W-Cu composites during solid state sintering at 1050°C is studied on samples quenched after different sintering times. The microstructure is formed by 3 phases: tungsten (W), copper (Cu) and pores. During the process, the initial mixture of W- and Cu-powder is transformed by migration of Cu and rearrangement of W particles. These microstructural changes are studied to identify the underlying phenomena and to control the material properties. Based on experiments performed with two different W powders, this paper deals with various aspects of the quantitative analysis of the observed evolution. A careful preparation of the images is necessary. The porous samples are impregnated with a resin under vacuum before being cut and carefully polished. Low voltage (<10 kV) is used during image acquisition on a scanning electron microscope. Area fraction measurements are used to check the quality of the images and the segmentation process. Classical measurements are used to study the spreading of Cu onto the surface of W particles: surface area of each phase, area of contact between phases, chord length distributions. New measurements based on classical methods are also developed to distinguish between two mechanisms of Cu migration in the microstructure : Cu spreading on W surface (wetting of the surface), and capillary penetration in the inter-W channels. An analysis of the location of Cu and pores in the space between W particles (inter-W space) is performed using a granulometry based on 2D openings. It evidences the mechanism of capillary penetration of Cu in the inter-W space in the case of small W-particles.

scholarly journals Synthesis and Electrochemical Properties of Lithium Titanate Anode Materials Powders by Solid State Reaction of Li and Spherical TiO2 Powders

2011 ◽  
Vol 485 ◽  
pp. 119-122
Author(s):  
Motofumi Yamada ◽  
Hiroshi Kawaguchi ◽  
Takayuki Kodera ◽  
Takashi Ogihara
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Spinel Structure ◽  
Anode Materials ◽  
Lithium Titanate ◽  
Initial Discharge Capacity ◽  
Composite Powders ◽  
Particle Characteristics ◽  
Initial Discharge ◽  
Acid Aqueous Solution

Li4Ti5O12 powders were synthesized by solid state reaction of Li2CO3 and spherical composite powders of carbon and TiO2 (denoted as C/TiO2). C/TiO2 powders were synthesized by spray pyrolysis of using lactic acid aqueous solution. The particle characteristics of Li4Ti5O12 powders were determined by SEM, XRD and DTA-TG. DTA-TG showed that the carbon content was around 8 wt% in Li4Ti5O12 powders. XRD revealed that the spinel structure (Fd3m) was obtained by heating at 750 °C under N2 atmosphere. The first rechargeable capacity of Li4Ti5O12 anode was about 160 mAh/g at 1 C. That of Li4Ti5O12 anode decreased to 90 mAh/g at 20 C. The rechargeable capacity of Li4Ti5O12 anode decreased with increasing the rechargeable rate, but 81% of initial discharge capacity of Li4Ti5O12 anode was retained after 200 cycles at 1C

Fabrication and Characterization of Yttrium Lanthanum Oxide Transparent Ceramics Using Powders Prepared by Different Methods

2011 ◽  
Vol 299-300 ◽  
pp. 588-591
Author(s):  
Yun Han Li ◽  
Qiu Hong Yang ◽  
Shen Zhou Lu
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Lanthanum Oxide ◽  
Chemical Properties ◽  
Particle Growth ◽  
Solid State Reaction Method ◽  
Temperature Treatment ◽  
High Temperature Treatment ◽  
Transparent Ceramics ◽  
Composite Powders

Yttrium Lanthanum Oxide transparent ceramics were fabricated with (Y0.9La0.1)2O3 powders prepared by different methods. The growth characteristics, physical and chemical properties of the powders were investigated. The wet-chemical composite powders’ particle size was inhibited by La2O3 at high temperature treatment, therefore smaller than that of powders by solid-state reaction method. During the solid-state reaction between La2O3 and Y2O3 at temperature of 700~1100°C, La2O3 may have not effectively hindered the particle growth of Y2O3. (Y0.90La0.10)2O3 ceramic fabricated by both powders own smaller grain size and lower porosity than Y2O3 ceramics. The transmittance and sintering performance of Y2O3 ceramics were also improved after adding of La2O3. The powders prepared by both methods could be used to make high transparency ceramics.

Effect of C content on the microstructure evolution during early solid state sintering of WC–Co alloys

2014 ◽  
Vol 44 ◽  
pp. 27-34 ◽  
Author(s):  
V. Bounhoure ◽  
S. Lay ◽  
F. Charlot ◽  
A. Antoni-Zdziobek ◽  
E. Pauty ◽  
...  
Keyword(s):  
Solid State ◽  
Microstructure Evolution ◽  
Solid State Sintering ◽  
Co Alloys
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