Application of Quantitative Metallography to the Analysis of Grain Growth During Liquid-Phase Sintering

2008 ◽  
pp. 29-29-12 ◽  
Author(s):  
G Petzow ◽  
S Takajo ◽  
WA Kaysser
Keyword(s):  
Liquid Phase ◽  
Grain Growth ◽  
Liquid Phase Sintering ◽  
Quantitative Metallography

Liquid Phase Sintering of (Ti,W)C-Ni-Co-Cr Cermets: Microstructure and Abrasive Wear Behavior

2018 ◽  
Vol 274 ◽  
pp. 1-8 ◽  
Author(s):  
I. Iparraguirre ◽  
L. Lozada ◽  
F. Ibarreta ◽  
R. Martinez ◽  
J.M. Sanchez
Keyword(s):  
Liquid Phase ◽  
Grain Growth ◽  
Abrasion Resistance ◽  
Wear Behavior ◽  
Liquid Phase Sintering ◽  
Point Of View ◽  
Cemented Carbides ◽  
Microstructural Refinement ◽  
Abrasive Wear Behavior ◽  
High Degree

TiC-WC-(Ni,Co,Cr) cermets are potential candidates for the substitution of straight cemented carbides in certain wear applications. This work analyses the effect of Ti/W and Co/Ni ratios on the microstructure and abrasion resistance of this type of cermets. From a microstructural point of view, cermets in the (Ti,W)C-(Ni,Co,Cr) pseudo-binary region show uncontrolled (Ti,W)C grain growth and a high degree of contiguity of the carbide phase. A microstructural refinement is observed as the Ti/W ratio decreases, especially when WC precipitation occurs. Abrasion resistance in these materials is dominated by hardness.

Synthesis of WC-10wt.%Co Nanocrystalline Powders with Grain Growth Inhibitor by MTP

2007 ◽  
Vol 534-536 ◽  
pp. 1237-1240 ◽  
Author(s):  
Dong Kyu Park ◽  
Kwang Chul Jung ◽  
Jin Chun Kim ◽  
Sung Yeal Bae ◽  
In Sup Ahn
Keyword(s):  
Grain Size ◽  
Wear Resistance ◽  
Liquid Phase ◽  
Grain Growth ◽  
Growth Inhibitor ◽  
Liquid Phase Sintering ◽  
Nanocrystalline Powders ◽  
Grain Growth Inhibitor ◽  
Nano Crystalline ◽  
Carburizing Process

To improve the fracture strength and wear resistance of WC-Co cemented carbide, various technologies have been developed related producing the nano crystalline. There have been extensive studied conducted to retard grain growth during liquid phase sintering. However, when this inhibitor is added by simple mixing, a micro-pores forms during sintering In this study, WC-Co nanocrystalline powders with grain growth inhibitor in the site were prepared by MTP (Mechano-Thermic carburizing Process) to minimize this formation of micro pores and to retard grain growth effectively during sintering. In addition, then the phase and grain size of WC-Co nanocrystalline powders were evaluated according to the condition of MTP.

Microstructure of TiB2 liquid phase sintered with Ni3Al

1983 ◽  
Vol 41 ◽  
pp. 62-63
Author(s):  
P. Angelini ◽  
J. Bentley ◽  
C. B. Finch ◽  
P. S. Sklad
Keyword(s):  
Solid Solution ◽  
Thermal Expansion ◽  
Liquid Phase ◽  
Electrical Properties ◽  
Grain Growth ◽  
Hot Pressing ◽  
Liquid Phase Sintering ◽  
Intergranular Phase ◽  
Phase Development ◽  
Al Powder

TiB2 is a ceramic material which possesses exceptional thermal, chemical, and electrical properties. Commercial powders can be formed into bulk pieces by hot pressing at temperatures near 2000°C. However, this produces excessive grain growth which can lead to cracking and low mechanical integrity due to the relatively large anisotropic thermal expansion of the TiB2 grains. Liquid phase sintering can be used to produce structural forms of TiB2 by hot pressing at temperatures near 1450°C. This process limits the TiB2 grain growth but introduces an intergranular phase. Previous work used Ni as a binder and under most hot-pressing conditions this resulted in the formation of a Ni3B intergranular phase. Additional binders are being considered to understand the phase development during liquid-phase sintering and to improve the properties of the bonded TiB2 forms.The present research concerns the use of Ni3Al as a binder for TiB2. The Ni3Al powder was a physical mixture of 32 wt % NiAl and 68 wt % of a solid solution of 95 at. % Ni with 5 at. % Al powders.

Effect of Grain Growth on Pore Coalescence During the Liquid-Phase Sintering of MgO-CaMgSiO4 Systems

1988 ◽  
Vol 71 (10) ◽  
pp. 854-857 ◽  
Author(s):  
UN-CHOL OH ◽  
YOUNG-SOO CHUNG ◽  
DOH-YEON KIM ◽  
DUK N. YOON
Keyword(s):  
Liquid Phase ◽  
Grain Growth ◽  
Liquid Phase Sintering
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