Effect of silicon on the properties of sintered alloys of (Al – Si) – Sn system

2021 ◽  
Vol 5 ◽  
pp. 37-48
Author(s):  
N. M. Rusin ◽  
◽  
A. L. Skorentsev ◽  
Keyword(s):  
Wear Resistance ◽  
Liquid Phase ◽  
Dry Friction ◽  
Structural Features ◽  
Liquid Phase Sintering ◽  
Favorable Effect ◽  
Sintered Compact ◽  
Friction Forces ◽  
Aluminum Powders ◽  
Sintered Alloys

Structural features of composites of the (Al – xSi) – 40Sn system prepared by liquid-phase sintering of mixtures of tin powder of PO 2 grade with powders of Al – Si alloys of hypoeutectic, eutectic, and hypereutectic composition were studied in this work. Samples were cut from the prepared materials for compression test and dry friction test against steel according to the “pin-on-disk” scheme. It was established that the main structural elements of the sintered composites are determined by the nature of interaction of solid silumin particles and liquid tin. This is due to the fact that tin not only spreads over the volume of the sintered compact, but also activates the processes of recrystallization of aluminum powders due to dissolution of their atoms in the liquid phase with subsequent deposition on the large particles surface. The dissolution weakens the skeleton of aluminum powders, and they are able to regroup into a denser configuration under the action of capillary forces. It was found that silicon inhibits the shrinkage of the compacts during the liquid-phase sintering. Therefore, to improve the mechanical properties of the sintered composites, they should be subjected to additional densification in order to eliminate their residual porosity, which simultaneously contributes to a significant increase in their wear resistance under dry friction. The study of the wear features of the (Al – хSi) – 40Sn composites was carried out. It was found that silicon particles located in the tin interlayers hinder the relative shear of the neighboring matrix grains and increase the thickness of the surface layer involved in deformation by friction forces. This fact has a favorable effect on the wear resistance of the investigated sintered composites under dry friction process. The (Al – 12Si) – 40Sn composite sample with the eutectic matrix has the highest wear resistance.

Structure and Tribotechnical Properties of Al-Sn Alloys Prepared by the Method of Liquid-Phase Sintering

2014 ◽  
Vol 1040 ◽  
pp. 166-170 ◽  
Author(s):  
N.M. Rusin ◽  
A.L. Skorentsev ◽  
E.A. Kolubaev
Keyword(s):  
Wear Resistance ◽  
Liquid Phase ◽  
Friction Coefficient ◽  
Dry Friction ◽  
Liquid Phase Sintering ◽  
Aluminium Matrix ◽  
Tribotechnical Properties ◽  
Pure Metals ◽  
Sintered Alloys ◽  
Skeleton Structure

The structure and tribotechnical properties of sintered Al-Sn alloys were studied. It was pointed that the sintering of pure metals powders allows save the skeleton structure of aluminium matrix at the enlarging concentration of tin up to 50% that twice higher its content in commercial alloys this system. It was established that the high Sn content in sintered alloys leads to their well wear resistance under the dry friction conditions, but it not has an influence on the value of friction coefficient.

Effect of small alloying additions on mechanical properties of sintered Al—Sn composites

2021 ◽  
pp. 2-9
Author(s):  
N. M. Rusin ◽  
◽  
A. L. Skorentsev ◽  
Keyword(s):  
Mechanical Properties ◽  
Liquid Phase ◽  
Equal Channel Angular Pressing ◽  
Aluminum Matrix ◽  
Liquid Phase Sintering ◽  
Plastic Properties ◽  
Aluminum Powders ◽  
Alloying Additions ◽  
Angular Pressing ◽  
Alloying Additives

Composites of the Al—Sn system obtained by liquid-phase sintering of a mixture of doped aluminum powders with tin powder have been investigated. It was found that a small amount of alloying additives (Zn, Mg, Si, Cu) contributed to a considerable strengthening of the aluminum matrix when processing it by the method of equal channel angular pressing, but at the same time reduced the plastic properties. Samples alloyed with 2% Cu demonstrate the maximum strength and minimum ductility.

Interaction of Components of Co-Sn and Co-Sn-Cu Powder Materials in Liquid Phase Sintering

2019 ◽  
Vol 943 ◽  
pp. 113-118
Author(s):  
Evgeniy Georgiyevich Sokolov ◽  
Alexander Vitalyevich Ozolin ◽  
Lev Ivanovich Svistun ◽  
Svetlana Alexandrovna Arefieva
Keyword(s):  
Liquid Phase ◽  
Solid Phase ◽  
Steel Substrate ◽  
Liquid Phase Sintering ◽  
Powder Materials ◽  
Cu Alloys ◽  
Initial Stage ◽  
Interaction Of Components ◽  
Sintered Alloys ◽  
Liquid Tin

The interaction of components and structure formation were studied in liquid phase sintering of Co-Sn and Co-Sn-Cu powder materials. The powders of commercially pure metals were mixed with an organic binder and applied on the steel substrate. Sintering was performed under vacuum at temperatures of 820 and 1100 °C. The structure of sintered alloys was investigated by X-ray diffractometry and electron probe microanalysis, and microhardness (HV0.01) of the structural components was measured. It has been found that the nature of interaction of the liquid tin with the solid phase at the initial stage of sintering affects the formation of structure and porosity of Co-Sn and Co-Sn-Cu alloys considerably. In Co-Sn alloys, diffusion of tin into cobalt particles leads to the formation of intermetallic compounds, which hinders spreading of the liquid phase. This results in a porous defect structure formed in Co-Sn alloys. In Co-Sn-Cu alloys, at the initial stage of sintering the liquid phase enriched with copper is formed that wets the cobalt particles and contributes to their regrouping. As a result of this, materials with minor porosity are formed.

Improving the dry sliding-wear resistance of B4C ceramics by transient liquid-phase sintering

2020 ◽  
Vol 40 (15) ◽  
pp. 5286-5292 ◽  
Author(s):  
Cristina Ojalvo ◽  
Estíbaliz Sánchez-González ◽  
Fernando Guiberteau ◽  
Oscar Borrero-López ◽  
Angel L. Ortiz
Keyword(s):  
Wear Resistance ◽  
Liquid Phase ◽  
Sliding Wear ◽  
Transient Liquid Phase ◽  
Liquid Phase Sintering ◽  
Dry Sliding Wear ◽  
Dry Sliding ◽  
Transient Liquid Phase Sintering

Wear resistance of in situ MMC produced by supersolidus liquid phase sintering (SLPS)

Wear ◽  
2009 ◽  
Vol 267 (11) ◽  
pp. 1791-1797 ◽  
Author(s):  
Hans Berns ◽  
Anastasia Saltykova
Keyword(s):  
Wear Resistance ◽  
Liquid Phase ◽  
Liquid Phase Sintering

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.

Liquid-phase sintering of BN doped Fe-Cu/TiC composites

1996 ◽  
Vol 54 ◽  
pp. 666-667
Author(s):  
Nuri Durlu ◽  
Nan Yao ◽  
David L. Milius ◽  
Ilhan A. Aksay
Keyword(s):  
Wear Resistance ◽  
Liquid Phase ◽  
Hot Pressing ◽  
Liquid Phase Sintering ◽  
Electron Microscopic ◽  
Hard Particles ◽  
Cu Alloys ◽  
The Matrix ◽  
Full Densification

Fe-Cu composites are commonly produced by liquid phase sintering (above the melting temperature of Cu, 1085°C). The wear resistance of these Fe-Cu alloys can be enhanced by introducing hard particles, e.g., TiC, into the matrix. In such cases, however, the densification of Fe-Cu/TiC composites by liquid phase sintering becomes difficult mainly due to the high wetting angle (110° at 1100-1200°C in argon) of liquid Cu with TiC particles. Especially when the amount of the TiC phase is high enough to form a continuous network of TiC grains, full densification is only achieved through hot pressing. We have recently overcome this problem in an [(Fe-4 wt% Cu) + 30 wt% TiC] composite by the addition of small amounts of BN. Composites with BN additives have been successfully sintered at 1275°C under vacuum or argon by additions of 1 wt% BN. Electron microscopic characterization of these composites has shown that this success is due to the modification of the liquid phase by the addition of BN, which also promotes the liquid phase sintering of the TiC phase.

Mechanical Ball Milling and Liquid Phase Sintering of Steel-Bonded Cemented Carbide Machining Crumbs

2013 ◽  
Vol 765-767 ◽  
pp. 210-212
Author(s):  
Jian Ye ◽  
Wei Gao ◽  
Wen Ke Li ◽  
Zhao Qiang Zeng
Keyword(s):  
Wear Resistance ◽  
Liquid Phase ◽  
Ball Milling ◽  
Liquid Phase Sintering ◽  
Experimental Results ◽  
Cemented Carbide ◽  
Carbide Alloy ◽  
Conventional Steel ◽  
Mechanical Ball Milling

The technology is introduced about mechanical ball milling and liquid phase sintering of machining crumbs of steel based carbide alloy in this article. The materials obtained from machining crumbs of steel-bonded cemented carbide are qualified compared with the conventional steel-bonded cemented carbide materials in the aspects of hardness, wear resistance by using the technology and the process is reasonable and practicable, according to experimental results. It can be extremely important when considering the recycling and make full use of tungsten resources.

Liquid Phase Sintering of Fe-Cu-Sn-Pb System

2011 ◽  
Vol 672 ◽  
pp. 307-310
Author(s):  
Cristina Teișanu ◽  
Stefan Gheorghe
Keyword(s):  
Liquid Phase ◽  
Iron Powder ◽  
Hydrogen Atmosphere ◽  
Liquid Phase Sintering ◽  
Sintering Process ◽  
Sintered Compact ◽  
Different Temperatures ◽  
New Material

In this study the formation of the liquid phase during sintering process of Fe-Cu-Sn-Pb system was investigated. In order to reach this purpose a new material based on iron powder was developed using PM technologies. Additions like copper, tin and lead were added to iron powder and the mixture was sintered in dry hydrogen atmosphere at different temperatures and maintaining time. The liquid phase formed during sintering led to a considerable accurate process and swelling of the sintered compact was observed and studied.

Wear Property of Superfine Grained Si2N2O-Si3N4 Composites

2008 ◽  
Vol 368-372 ◽  
pp. 917-919
Author(s):  
Jun Ting Luo ◽  
Qing Zhang ◽  
Hong Bo Li
Keyword(s):  
Grain Size ◽  
Wear Resistance ◽  
Silicon Nitride ◽  
Liquid Phase ◽  
Sintering Temperature ◽  
High Hardness ◽  
Liquid Phase Sintering ◽  
Wear Property ◽  
Average Grain Size ◽  
Bearing Ball

Si3N4-Si2N2O composites were fabricated with amorphous nano-sized silicon nitride powders by the liquid phase sintering. The mass loss, relative density and average grain size increase with increasing sintering temperature. The average grain size is less than 500nm when the sintering temperature is lower than 1700°C. Friction coefficient is from 0.35 for sintering temperature 1650°C to 0.74 for 1600°C when the composites were worn by silicon nitride bearing ball. High hardness of 21.5GPa and relative wear resistance of 32 were observed at a sintering temperature of 1600°C. The wear surface are very smooth and no grooving and subsurface fracture, which indicates that they are worn slightly.

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