scholarly journals On the Structural and Chemical Homogeneity of Spark Plasma Sintered Tungsten

Metals ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 879 ◽  
Author(s):  
Jiří Matějíček ◽  
Monika Vilémová ◽  
Jakub Veverka ◽  
Jiří Kubásek ◽  
František Lukáč ◽  
...  
Keyword(s):  
Phase Segregation ◽  
Sintering Process ◽  
Fabrication Technology ◽  
Chemical Homogeneity ◽  
Sintered Tungsten ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Plasma Facing Materials ◽  
Temperature And Pressure ◽  
Processing Factors

Tungsten-based materials are the prime candidate plasma-facing materials for future fusion reactors, such as DEMO. Spark plasma sintering is a prospective fabrication technology with several advantageous features. The concurrent application of electric current, temperature and pressure enhances the sintering process, allowing for lower temperatures and shorter sintering times than traditional powder metallurgy processes. This in turn helps to avoid excessive grain growth and phase segregation in W-alloys. This study is focused on several factors that may influence the homogeneity of the sintered compacts—namely the diffusion of carbon from the graphite die, purity of the powder and sintering conditions. The following characteristics of spark plasma-sintered tungsten compacts were studied: composition (especially carbon and oxygen content), porosity, mechanical properties (hardness and fracture strength), and thermal diffusivity. The effects of the abovementioned processing factors were quantified, and local variations of selected properties were assessed.

Investigations on the Textured Bi3NbTiO9 Ceramics via Spark Plasma Sintering

2010 ◽  
Vol 146-147 ◽  
pp. 277-280
Author(s):  
Bao Rang Li ◽  
Yin Cheng ◽  
Yang Sheng Zheng
Keyword(s):  
Spark Plasma Sintering ◽  
Single Phase ◽  
Molten Salt Method ◽  
Sintering Process ◽  
Oxide Mixture ◽  
Orientation Degree ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Temperature And Pressure ◽  
Sintering Method

This paper reported results of an investigation aiming at finding what affected the orientated grain growth of Bismuth titanate niobate (Bi3TiNbO9) by spark plasma sintering process (SPS). Single phase of textured Bi3TiNbO9 (BTNO) ceramics were prepared by a two-step sintering method: synthesizing seed-crystal platelets by molten-salt method with oxide mixture as precursors and then sintering the platelets under different SPS conditions such as heating rate, holding time, sintering temperature and pressure, etc. The possible effects of these factors upon the textured microstructure have been analyzed in detail. Textured Bi3TiNbO9 ceramics with different orientation degree was obtained by controlling the conditions during SPS process.

scholarly journals Mechanical Study of Copper Bonded at Low Temperature Using Spark Plasma Sintering Process

2011 ◽  
Vol 324 ◽  
pp. 177-180 ◽  
Author(s):  
Bassem Mouawad ◽  
Maher Soueidan ◽  
Damien Fabrègue ◽  
Cyril Buttay ◽  
Vincent Bley ◽  
...  
Keyword(s):  
Spark Plasma Sintering ◽  
Bonding Strength ◽  
Room Temperature ◽  
Mechanical Characterization ◽  
Sintering Process ◽  
Plasma Sintering ◽  
Mechanical Study ◽  
Spark Plasma ◽  
Temperature And Pressure

Bonding of high purity polished copper was investigated using the Spark Plasma Sintering technique (SPS) showing the effect of SPS parameters (surface roughness, time, temperature and pressure) on the bonding strength behaviour. Mechanical characterization of the bonded samples was performed at room temperature using tensile test. Two surfaces roughnesses were studied (un-polished and polished samples). It was found that the bonding strength varied from 50 MPa to 233 MPa for un-polished and polished surfaces respectively The tensile strength of the used bulk copper-rod was found to be 365 MPa, while most results are over 122 MPa (a third of the bulk value).

Fabrication and Mechanical Properties of ultra fine WC-6wt.%Co by Spark Plasma Sintering Process

2011 ◽  
Vol 49 (01) ◽  
pp. 40-45 ◽  
Author(s):  
Hyun-Kuk Park ◽  
Seung-Min Lee ◽  
Hee-Jun Youn ◽  
Ki-Sang Bang ◽  
Ik-Hyun Oh
Keyword(s):  
Mechanical Properties ◽  
Spark Plasma Sintering ◽  
Sintering Process ◽  
Plasma Sintering ◽  
Spark Plasma

scholarly journals Processing of MMC through conventional sintering and spark plasma sintering process: A review

2020 ◽  
Vol 988 ◽  
pp. 012092
Author(s):  
B Stalin ◽  
M Ravichandran ◽  
M Balasubramanian ◽  
C Anand Chairman ◽  
D Pritima ◽  
...  
Keyword(s):  
Spark Plasma Sintering ◽  
Sintering Process ◽  
Plasma Sintering ◽  
Conventional Sintering ◽  
Spark Plasma

scholarly journals Shape Memory NiTi and NiTiCu Alloys Obtained by Spark Plasma Sintering Process

2015 ◽  
Vol 13 ◽  
pp. 83-90 ◽  
Author(s):  
Cristiana Diana Cristea ◽  
Magdalena Lungu ◽  
Alexander M. Balagurov ◽  
Virgil Marinescu ◽  
Otilia Culicov ◽  
...  
Keyword(s):  
Shape Memory ◽  
Intermetallic Compounds ◽  
Spark Plasma Sintering ◽  
Sintering Process ◽  
Transformation Behavior ◽  
Plasma Sintering ◽  
New Process ◽  
Shape Memory Properties ◽  
Spark Plasma ◽  
Niti Shape Memory Alloys

The addition of Cu to near equiatomic NiTi shape memory alloys (SMAs) can provide some modifications of their shape memory properties by affecting their transformation behavior. The same effect was obtained in the case of Ni3Ti2 and Ni4Ti3 precipitates presence in the microstructure of NiTi. Also the substitution of Cu to NiTi alloys increases the hardness of the materials. This paper presents the microstructural and mechanical investigations of NiTi and NiTiCu alloys obtained by spark plasma sintering (SPS) process that represents a great potential for researchers as a new process for the fabrication of intermetallic compounds.

scholarly journals Effects of Initial Punch-Die Clearance in Spark Plasma Sintering Process

2008 ◽  
Vol 49 (12) ◽  
pp. 2899-2906 ◽  
Author(s):  
Salvatore Grasso ◽  
Yoshio Sakka ◽  
Giovanni Maizza
Keyword(s):  
Spark Plasma Sintering ◽  
Sintering Process ◽  
Plasma Sintering ◽  
Spark Plasma

Development of WC-Fe3Al Composites by Spark Plasma Sintering Process

2016 ◽  
Vol 881 ◽  
pp. 307-312
Author(s):  
Luis Antonio C. Ybarra ◽  
Afonso Chimanski ◽  
Sergio Gama ◽  
Ricardo A.G. da Silva ◽  
Izabel Fernanda Machado ◽  
...  
Keyword(s):  
Spark Plasma Sintering ◽  
Zinc Stearate ◽  
Sintering Process ◽  
X Ray Diffraction ◽  
X Ray ◽  
Plasma Sintering ◽  
Al Composite ◽  
Spark Plasma ◽  
Short Time ◽  
Vibration Mill

Tungsten carbide (WC) based composites are usually produced with cobalt, but this binder has the inconvenience of shortage, unstable price and potential carcinogenicity. The objective of this study was to develop WC composite with intermetallic Fe3Al matrix. Powders of WC, iron and aluminum, with composition WC-10 wt% Fe3Al, and 0.5 wt% zinc stearate were milled in a vibration mill for 6 h and sintered in a SPS (spark plasma sintering) furnace at 1150 °C for 8 min under pressure of 30 MPa. Measured density and microstructure analysis showed that the composite had significant densification during the (low-temperature, short time) sintering, and X-ray diffraction analysis showed the formation of intermetallic Fe3Al. Analysis by Vickers indentation resulted in hardness of 11.2 GPa and fracture toughness of 24.6 MPa.m1/2, showing the feasibility of producing dense WC-Fe3Al composite with high mechanical properties using the SPS technique.

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