Phase evolution, microstructure characteristics and properties of Cr3C2-Ni cermets prepared by reactive sintering

2011 ◽  
Vol 40 (1/2) ◽  
pp. 75 ◽  
Author(s):  
Kristjan Juhani ◽  
Juri Pirso ◽  
Sergei Letunovits ◽  
Mart Viljus
Keyword(s):  
Phase Evolution ◽  
Reactive Sintering ◽  
Microstructure Characteristics

Phase evolution and microstructure characteristics of Mo-based Tb 2 O 3 -Dy 2 O 3 composites synthesized by ball milling and sintering

2018 ◽  
Vol 29 (2) ◽  
pp. 359-366 ◽  
Author(s):  
Yizhen Wu ◽  
Guang Ran ◽  
Wei Zhou ◽  
Dong Lv ◽  
Chao Ye ◽  
...  
Keyword(s):  
Ball Milling ◽  
Phase Evolution ◽  
Microstructure Characteristics

Phase evolution during reactive sintering by viscous flow: Disclosing the inner workings in porcelain stoneware firing

2020 ◽  
Vol 40 (4) ◽  
pp. 1738-1752 ◽  
Author(s):  
Sonia Conte ◽  
Chiara Zanelli ◽  
Matteo Ardit ◽  
Giuseppe Cruciani ◽  
Michele Dondi
Keyword(s):  
Viscous Flow ◽  
Phase Evolution ◽  
Reactive Sintering

ChemInform Abstract: Phase Evolution During the Reactive Sintering of Ternary Al-Ni-Ti Powder Compacts.

ChemInform ◽  
2016 ◽  
Vol 47 (9) ◽  
pp. no-no
Author(s):  
Hossein Sina ◽  
Kumar Babu Surreddi ◽  
Srinivasan Iyengar
Keyword(s):  
Phase Evolution ◽  
Reactive Sintering ◽  
Ti Powder ◽  
Powder Compacts

scholarly journals PHASE FORMATION IN NiTiAl10 POWDER MIXTURE DURING HEATING TO 1100 °C

2018 ◽  
Vol 24 (2) ◽  
pp. 181
Author(s):  
Pavel Salvetr ◽  
Andrea Školáková ◽  
Pavel Novák ◽  
Dalibor Vojtěch
Keyword(s):  
Thermal Analysis ◽  
Combustion Synthesis ◽  
Heating Rate ◽  
Powder Mixture ◽  
Induction Furnace ◽  
Sintering Temperature ◽  
Phase Evolution ◽  
Optical Pyrometer ◽  
Reactive Sintering ◽  
Al Powder

<p class="AMSmaintext">In this paper the comparison of NiTiAl10 wt. % with the binary NiTi46 wt. % prepared by powder metallurgy was researched. The method of combustion synthesis was carried out under following conditions: sintering temperature of 800 °C and 1100 °C and heating rate approx. 300 °C.min<sup>-1</sup>. The addition of aluminium into NiTi46 wt. % powder mixture completely changed the temperature of combustion synthesis and phase evolution during sintering. The reactions into Ni-Ti-Al powder mixture started below the melting temperature of aluminium and the new phases were formed in microstructure. The process of reactive sintering was studied by differential thermal analysis using the heating rate of 30 °C.min<sup>-1</sup> and 100 °C.min<sup>-1</sup> using combination of induction furnace and optical pyrometer. The addition of aluminium influenced microstructure significantly and increased the hardness of samples.</p>

scholarly journals Control of FeAl Composition Produced by SPS Reactive Sintering from Mechanically Activated Powder Mixture

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
S. Paris ◽  
E. Gaffet ◽  
F. Bernard
Keyword(s):  
Powder Mixture ◽  
Intermediate Phase ◽  
Exothermic Reaction ◽  
Phase Evolution ◽  
High Energy ◽  
Reactive Sintering ◽  
Powder Mixtures ◽  
Multilayer Systems ◽  
Class A ◽  
Class B

The effects of mechanically activated powder mixture (Fe + Al) on the microstructure and the chemical composition of FeAl compound produced by reactive sintering implying an exothermic reaction were studied. Firstly, the characteristics of Fe/Al mechanically activated powder mixtures were investigated in terms of their phase composition and microstructure. The high-energy milling allowed the formation of micrometric agglomerates composed of nanometric crystallites of iron and aluminum. Three aggregate sizes class A:ϕ<125 µm, class B:125 µm≤ϕ<250 µm, and class C:ϕ≥250 µm were considered. The latter class enhanced the reactivity of powder mixtures due to an increase of interfaces in contact as an analogy to nanostructured multilayer systems. Interrupted SPS experiments were performed on these mixtures to understand the origin of chemical heterogeneities observed after the reactive sintering. Formation of the intermediate phase Fe2Al5at ~510°C was accompanied by an exothermic reaction and a linear expansion and followed by the formation of small amount of FeAl. The conversion to FeAl was complete at temperatures higher than the melting point of Fe2Al5(1170°C). Finally, a phase evolution between Fe and Al versus the temperature during the reactive sintering is suggested.

Phase evolution during the reactive sintering of ternary Al–Ni–Ti powder compacts

2016 ◽  
Vol 661 ◽  
pp. 294-305 ◽  
Author(s):  
Hossein Sina ◽  
Kumar Babu Surreddi ◽  
Srinivasan Iyengar
Keyword(s):  
Phase Evolution ◽  
Reactive Sintering ◽  
Ti Powder ◽  
Powder Compacts

Chemical Availability of Bromide Dictates CsPbBr3 Nanocrystal Growth

2019 ◽  
Author(s):  
Je-Ruei Wen ◽  
Benjamin Roman ◽  
Freddy Rodriguez Ortiz ◽  
Noel Mireles Villegas ◽  
Nicholas Porcellino ◽  
...  
Keyword(s):  
Reaction Time ◽  
Growth Mechanism ◽  
Chemical Control ◽  
Critical Role ◽  
Phase Evolution ◽  
Detailed Understanding ◽  
Semiconductor Nanocrystal ◽  
Nanocrystal Growth ◽  
Chemical Availability

Lack of detailed understanding of the growth mechanism of CsPbBr3 nanocrystals has hindered sophisticated morphological and chemical control of this important emerging optoelectronic material. Here, we have elucidated the growth mechanism by slowing the reaction kinetics. When 1-bromohexane is used as an alternative halide source, bromide is slowly released into the reaction mixture, extending the reaction time from ~3 seconds to greater than 20 minutes. This enables us to monitor the phase evolution of products over the course of reaction, revealing that CsBr is the initial species formed, followed by Cs4PbBr6, and finally CsPbBr3. Further, formation of monodisperse CsBr nanocrystals is demonstrated in a bromide-deficient and lead-abundant solution. The CsBr can only be transformed into CsPbBr3 nanocubes if additional bromide is added. Our results indicate a fundamentally different growth mechanism for CsPbBr3 in comparison with more established semiconductor nanocrystal systems and reveal the critical role of the chemical availability of bromide for the growth reactions.<br>

Sign in / Sign up

Export Citation Format

Share Document