Carbide composition change during liquid phase sintering of a wear resistant alloy

1984 ◽  
Vol 15 (6) ◽  
pp. 1099-1102 ◽  
Author(s):  
P. J. Mcginn ◽  
P. Kumar ◽  
A. E. Miller ◽  
A. J. Hickl
Keyword(s):  
Liquid Phase ◽  
Liquid Phase Sintering ◽  
Composition Change ◽  
Wear Resistant ◽  
Resistant Alloy

Wear Resistant In Situ MMC Sintered with FeBC Liquid Phase

2011 ◽  
Vol 672 ◽  
pp. 91-98 ◽  
Author(s):  
Anastasia Saltykova ◽  
Hans Berns
Keyword(s):  
Liquid Phase ◽  
Mesh Size ◽  
Steel Powder ◽  
Liquid Phase Sintering ◽  
Full Density ◽  
Steel Matrix ◽  
Tungsten Carbides ◽  
Component Mixture ◽  
Wear Resistant

Powder metallurgy represents a good alternative to a conventional casting process to produce wear resistant materials. MMC (metal matrix composite) of a hardenable steel matrix and hard phases compacted by hot isostatic pressing (HIP) are highly wear resistant but high in price. In the present study liquid phase sintering was preferred to HIP and expensive hard phases as tungsten carbides were replaced by ferrotitanium particles (FeTi) to reduce costs. A mixture of gas atomized hot work steel powder of < 150 µm in size, hypereutectic FeBC powder of < 36 µm in size as liquid phase donor (LPD) and ferrotitanium particles (100-150 µm in size) with about 70 mass% of Ti was sintered in vacuum to give a wear resistant MMC of full density. However, the elements B and C from LPD diffused to the steel powder before the liquid phase appeared. Therefore these two powders merged into a near-eutectic or hypoeutectic constitution. The LPD was diluted by the steel. During sintering the ferrotitanium particles are transformed in situ into hard phases (in situ HP) with a Fe-rich core surrounded by a hard TiC case to withstand abrasive wear. Numerous investigations by LOM, SEM with EDX, WDX and DTA were realized step by step for a deeper understanding of what happens in the initial three-component mixture during liquid phase sintering and how the in situ MMC forms. The resistance to wear was measured by pin-on-plate tests against abrasive paper of different hardness and mesh size and compared with HIP-MMC and SLPS-MMC.

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.

SOLID SOLUTION FORMATION DURING LIQUID PHASE SINTERING

1986 ◽  
Vol 47 (C1) ◽  
pp. C1-441-C1-445
Author(s):  
E. KOSTIĆ ◽  
S. J. KISS ◽  
D. CEROVIĆ
Keyword(s):  
Solid Solution ◽  
Liquid Phase ◽  
Liquid Phase Sintering ◽  
Solid Solution Formation ◽  
Solution Formation

Microstructure development during liquid-phase sintering

2005 ◽  
Vol 96 (2) ◽  
pp. 141-147 ◽  
Author(s):  
Sung-Min Lee ◽  
Suk-Joong L. Kang
Keyword(s):  
Liquid Phase ◽  
Liquid Phase Sintering ◽  
Microstructure Development

ChemInform Abstract: Liquid Phase Sintering of Silicon Carbide.

ChemInform ◽  
2010 ◽  
Vol 27 (32) ◽  
pp. no-no
Author(s):  
F. K. VAN DIJEN ◽  
E. MAYER
Keyword(s):  
Silicon Carbide ◽  
Liquid Phase ◽  
Liquid Phase Sintering
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