scholarly journals Influence of nitrogen uptake and heat treatment on the microstructural characteristics and corrosion performance of X190CrVMo20‐4‐1 steel produced by supersolidus liquid‐phase sintering

2021 ◽  
Author(s):  
Peter K. Farayibi ◽  
Frederic Hassend ◽  
Michael Blüm ◽  
Sebastian Weber
Keyword(s):  
Heat Treatment ◽  
Liquid Phase ◽  
Nitrogen Uptake ◽  
Liquid Phase Sintering ◽  
Corrosion Performance ◽  
Microstructural Characteristics

Self-reinforced Y-α-sialon ceramics with barium.aluminosilicate as an additive

2003 ◽  
Vol 18 (10) ◽  
pp. 2446-2450 ◽  
Author(s):  
Feng Ye ◽  
Mikio Iwasa ◽  
Caili Su ◽  
Sheng Chen
Keyword(s):  
Heat Treatment ◽  
Liquid Phase ◽  
Flexural Strength ◽  
Vickers Hardness ◽  
Hot Pressing ◽  
Liquid Phase Sintering ◽  
Post Heat Treatment ◽  
Sintering Aid ◽  
Barium Aluminosilicate

Y-α-sialons (Y0.333Si10Al2ON15) were prepared by hot pressing using 5 wt.% BaAl2Si2O8 as an additive. The results showed that barium aluminosilicate not only.served as a liquid-phase sintering aid to promote densification, but also facilitated the.development of elongated α-sialon grains. The obtained self-toughened α-sialon was.both hard and tough. The Vickers hardness, flexural strength, and fracture toughness.are 18.9 GPa, 802 MPa, and 6.0 Mpam1/2, respectively. Post heat treatment could.promote the growth of elongated α-sialon grains, hence further increasing its.toughness.

Strength Degradation Flaws in the Liquid-Phase-Sintered SiC Based Ceramics

2009 ◽  
Vol 409 ◽  
pp. 350-353
Author(s):  
Alexandra Kovalčíková ◽  
Ján Dusza ◽  
Pavol Šajgalík
Keyword(s):  
Heat Treatment ◽  
Fracture Toughness ◽  
Silicon Carbide ◽  
Liquid Phase ◽  
Flexural Strength ◽  
Crack Deflection ◽  
Liquid Phase Sintering ◽  
Crack Branching ◽  
Mechanical Interlocking ◽  
Heat Treated

The effect of the heat treatment on the fracture toughness and flexural strength of the silicon carbide – silicon nitride composites prepared by liquid-phase-sintering was investigated. The results were compared to those obtained for a reference silicon carbide material, prepared by the same fabrication route. The fracture toughness increased from 3.19 to 5.15 MPa.m1/2 due to the toughening mechanisms (crack deflection, mechanical interlocking, crack branching) occurring in the heat treated materials during the crack propagation. However, the flexural strength decreased after the heat treatment of the experimental materials. The strength of the investigated materials was degraded by the presence of processing flaws mainly in the form of pores, clusters of pores, and SiC agglomerates.

Liquid phase sintering, heat treatment and properties of ultrahigh carbon steels

2011 ◽  
Vol 54 (5) ◽  
pp. 592-598 ◽  
Author(s):  
A A S Abosbaia ◽  
S C Mitchell ◽  
M Youseffi ◽  
A S Wronski
Keyword(s):  
Heat Treatment ◽  
Liquid Phase ◽  
Carbon Steels ◽  
Liquid Phase Sintering

Effect of furnace atmosphere and silica content on the consolidation behaviour of magnesia partially stabilised zirconia

1990 ◽  
Vol 48 (4) ◽  
pp. 1056-1057
Author(s):  
J. Drennan ◽  
R.H.J. Hannink ◽  
D.R. Clarke ◽  
T.M. Shaw
Keyword(s):  
Liquid Phase ◽  
Silica Content ◽  
Liquid Phase Sintering ◽  
Furnace Atmosphere ◽  
Boundary Phase ◽  
Analytical Electron ◽  
Analytical Electron Microscope ◽  
Series Of Experiments ◽  
Compositional Gradients ◽  
Mobile Liquid

Magnesia partially stabilised zirconia (Mg-PSZ) ceramics are renowned for their excellent nechanical properties. These are effected by processing conditions and purity of starting materials. It has been previously shown that small additions of strontia (SrO) have the effect of removing the major contaminant, silica (SiO2).The mechanism by which this occurs is not fully understood but the strontia appears to form a very mobile liquid phase at the grain boundaries. As the sintering reaches the final stages the liquid phase is expelled to the surface of the ceramic. A series of experiments, to examine the behaviour of the liquid grain boundary phase, were designed to produce compositional gradients across the ceramic bodies. To achieve this, changes in both silica content and furnace atmosphere were implemented. Analytical electron microscope techniques were used to monitor the form and composition of the phases developed. This paper describes the results of our investigation and the presentation will discuss the work with reference to liquid phase sintering of ceramics in general.

Microstructure and microanalysis of sintered Fe-Nd-B permanent magnets

1990 ◽  
Vol 48 (4) ◽  
pp. 990-991
Author(s):  
Mahesh Chandramouli
Keyword(s):  
Electron Microscope ◽  
Liquid Phase ◽  
Permanent Magnets ◽  
Phase Distribution ◽  
Energy Dispersive Spectrometer ◽  
Nucleation And Growth ◽  
Liquid Phase Sintering ◽  
Domain Wall Energy ◽  
Oxide Phases ◽  
Scanning Electron

Magnetization reversal in sintered Fe-Nd-B, a complex, multiphase material, occurs by nucleation and growth of reverse domains making the isolation of the ferromagnetic Fe14Nd2B grains by other nonmagnetic phases crucial. The magnets used in this study were slightly rich in Nd (in comparison to Fe14Nd2B) to promote the formation of Nd-oxides at multigrain junctions and incorporated Dy80Al20 as a liquid phase sintering addition. Dy has been shown to increase the domain wall energy thus making nucleation more difficult while Al is thought to improve the wettability of the Nd-oxide phases.Bulk polished samples were examined in a JEOL 35CF scanning electron microscope (SEM) operated at 30keV equipped with a Be window energy dispersive spectrometer (EDS) detector in order to determine the phase distribution.

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