sintering of refractories

sintering of refractories

Sintering of refractory metals - ScienceDirect

2010-1-1 · The tendency of refractory metals to oxidize requires reducing atmospheres or vacuum for sintering. Tungsten, Mo and Re are often sintered in 100% hydrogen with a dew point below − 20 °C. Iridium and Ru have less tendency to oxidize, so vacuum sintering is usually suitable.

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Sintering of magnesia refractories through the formation ...

2005-1-1 · 1.. IntroductionMagnesia is one of the widely used refractory materials for lining of steel and other industrial metallurgical furnaces. It is characterized by high refractoriness and good resistance to basic slags , .According to the high cost of magnesia and/or other magnesia refractory products as spinel and MgO–C, it is important to add suitable proportions of some other low cost ...

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Microwave Sintering of Refractory Metals/alloys: W, Mo,

2017-5-16 · recent research findings about how these refractory metals and alloys (W, Mo, Re, W-Cu, W-Ni-Cu and W-Ni-Fe) have been successfully consolidated using microwave sintering. A comparative study with conventional data has been made. In most cases, microwave sintering resulted in an overall reduction of sintering time of up to 80%.

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Four factors affecting the sintering of refractory ...

2020-7-1 · The sintering of refractory materials is a complex process that is restricted by many factors. The main factors that affect the sintering of refractory materials include the nature of the raw materials, additives, sintering temperature and holding time, firing atmosphere, and molding method and pressure of the green body. 1.

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Dry sintering of refractory oxides at elevated ...

Recent efforts to explore the possibility of extending the service of alumina-based refractories into basic steelmaking operations have involved the application of a basic oxide veneer to both fireclay and high-alumina substrates. Because these investigations used a mineralogically complex system consisting of mixtures of commercial refractories and coatings, the nature of the chemical ...

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Oscillating pressure sintering of W–Ni–Fe refractory alloy ...

2019-10-15 · Abstract. In this paper, we report the fabrication of 90W–7Ni–3Fe refractory alloy using a novel oscillating pressure sintering (OPS) technique. The technique is similar to conventional hot pressing (HP), excepting that an oscillating pressure replaces the static pressure in HP. The results show that compared to HP, OPS can significantly ...

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(DOC) Effect of graphite on the sintering and ...

Effect of graphite on the sintering and densification of alumina-chrome refractories Under the guidance of

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Refractory Metal Powder & Sintering Process of Refractory ...

Sintering is a hot processing method to produce refractory metals. First, heat the powder compact to the sintering temperature for a certain period of time. Then, wait for it to cool down and the refractory materials with required functions will be produced. Sintering makes the porous powder compact into a product with certain structures and ...

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Microwave Sintering of Refractory Metals/alloys: W, Mo,

2017-5-16 · recent research findings about how these refractory metals and alloys (W, Mo, Re, W-Cu, W-Ni-Cu and W-Ni-Fe) have been successfully consolidated using microwave sintering. A comparative study with conventional data has been made. In most cases, microwave sintering resulted in an overall reduction of sintering time of up to 80%.

Read More
Four factors affecting the sintering of refractory ...

2020-7-1 · The sintering of refractory materials is a complex process that is restricted by many factors. The main factors that affect the sintering of refractory materials include the nature of the raw materials, additives, sintering temperature and holding time, firing atmosphere, and molding method and pressure of the green body. 1.

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Pressing and Sintering of Refractory Metal Powders ...

This article discusses the pressing and sintering of various refractory metal powders for the production of intermediate products as well as special cases of finished products. The metal powders considered include tungsten, molybdenum, tantalum, niobium and their alloys, as well as rhenium.

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Sintering of dry vibratable refractory materials for EAF ...

Steelmaking electric arc furnaces (EAF) bottoms are usualy built up with dry vibratable refractory mixes. During furnace operation the refractory mix undergoes sinterization, slag attack, and chemical interaction with steel. aterial sintering is needed in the upper part of the EAF bottom, in order to develop enough mechanical strength and wear resistance during operation.

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MICROWAVE SINTERING OF REFRACTORY METALS

2014-10-23 · MICROWAVE SINTERING OF REFRACTORY METAL Refractory metals and alloys are well known for their high mechanical properties which make them useful for wide range of high temperature applications. Conventional P/M processing is a viable

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The Influence of the Sintering Atmosphere on Properties

Refractories for UO2 Sintering Furnace and Microstructure of UO2 Pellets Seung Jae Lee and Kyu Tae Kim Korea Nuclear Fuel Co., Ltd. 150 Deogjin-dong, Yusong-gu, Taejeon, Korea 305-353 Abstract The impact of various sintering atmosphere on thermochemical behavior of main refractory materials of the UO2 sintering furnace and on microstructure of ...

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Sintering Trays | Refractory | Manufacturer

Sintering is the heating of powder to fuse the particles into a solid material end product. The sintering temperature varies and needs to be high enough to cause fusion without melting the particles. Examples of some applications of sintering include creating technical ceramics and the fusion of metallic powders under high pressure conditions.

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Ultra-fast and energy-efficient sintering of ceramics by ...

2015-2-17 · SiC and MoSi 2 are used as sintering additives to minimize ZrO 2 formation during sintering and fabricate a pore free ZrB 2-based composite 15,16.Although the mean

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SINTERING OF REFRACTORY METAL BASED MATERIALS

iii ABSTRACT Sintering of tungsten (W; T melt =3400 oC), tantalum (Ta; T melt =3000 C), and tungsten carbide (WC; T melt =2800 oC) based materials was investigated by field assisted sintering, where electric current, uniaxial pressure, and relatively high heating rate were applied during sintering.

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Four factors affecting the sintering of refractory ...

2020-7-1 · The sintering of refractory materials is a complex process that is restricted by many factors. The main factors that affect the sintering of refractory materials include the nature of the raw materials, additives, sintering temperature and holding time, firing atmosphere, and molding method and pressure of the green body. 1.

Read More
Pressing and Sintering of Refractory Metal Powders ...

This article discusses the pressing and sintering of various refractory metal powders for the production of intermediate products as well as special cases of finished products. The metal powders considered include tungsten, molybdenum, tantalum, niobium and their alloys, as well as rhenium.

Read More
[PDF] Microwave Sintering of Refractory Metals/alloys: W ...

This review article describes recent research findings about how these refractory metals and alloys have been successfully consolidated using microwave sintering, which resulted in an overall reduction of sintered time of up to 80% and better mechanical properties have been observed. Abstract Refractory metals and alloys are well known for their high mechanical properties which make them ...

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Sintering of dry vibratable refractory materials for EAF ...

Steelmaking electric arc furnaces (EAF) bottoms are usualy built up with dry vibratable refractory mixes. During furnace operation the refractory mix undergoes sinterization, slag attack, and chemical interaction with steel. aterial sintering is needed in the upper part of the EAF bottom, in order to develop enough mechanical strength and wear resistance during operation.

Read More
Microwave Sintering of Refractory Metals/alloys: W, Mo,

2018-6-10 · However, owing to the refractoriness of these metals and alloys, it is very difficult to consolidate them under moderate conditions. Conventional P/M processing is a viable sintering technique for these refractory metals. One of the constraints in conventional sintering is long residence time which results in undesirable microstructural coarsening.

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Sintering in Hydrogen Atmosphere: It Punishes Refractory

2010-2-1 · Conclusion. Hydrogen-atmosphere furnaces, especially those operated above about 1350°C (2462°F), are very useful for sintering many high-end alloys and ceramic/metallic compositions, but the demands placed on refractory are formidable. In pusher-plate furnaces, the demands on refractory are especially great on the pusher plates.

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The Influence of the Sintering Atmosphere on Properties

Refractories for UO2 Sintering Furnace and Microstructure of UO2 Pellets Seung Jae Lee and Kyu Tae Kim Korea Nuclear Fuel Co., Ltd. 150 Deogjin-dong, Yusong-gu, Taejeon, Korea 305-353 Abstract The impact of various sintering atmosphere on thermochemical behavior of main refractory materials of the UO2 sintering furnace and on microstructure of ...

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Effects of oxidation of SiC aggregates on the sintering ...

2021-4-8 · In order to develop chrome-free refractory materials applicable in coal slurry gasification, SiC-CaAl12O19 (SiC-CA6) composite refractories were developed and prepared by using SiC aggregates and CA6 powders as main raw materials. The sintering behaviour of the composites was investigated. After firing at different

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