Reactive sintering and forging of mechanically milled Ti-Al powders by servo press with spark plasma sintering machine

Tantalum diboride was synthesized and sintered from metallic tantalum powder and amorphous boron powder in one technological process using Spark Plasma Sintering method. The precursors were: tantalum with grain size below 5μm and boron with particle size in the range of 1-2μm. Tantalum powder, before mixing with boron, was subjected to high-energy milling under argon atmosphere in order to reduce specific surface area. The process should be carried out without air, due to protection against the influence of oxygen. During reactive sintering SPS process oxidation participation should be limited because of high exothermic reactions. Morphologies of the powders before and after milling were studied using SEM. Reactive sintering processes were carried out at temperatures from 1800°C up to 2200°C at 48MPa. Sintering duration was in the range of 1-30min. Volume changes of samples and temperature increase during the synthesis were observed and determined. The result of X-Ray phase composition analysis and microstructure observations using SEM are presented. Relative density, Young's modulus, Vickers hardness and fracture toughness of the materials were determined. During the reactive sintering the material of only one phase TaB2, with high level of densification, was obtained.

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In Situ Synthesis of Alumina Matrix Composites by Spark Plasma Sintering

Materials Science Forum ◽

10.4028/www.scientific.net/msf.750.92 ◽

2013 ◽

Vol 750 ◽

pp. 92-95

Author(s):

Zhong Chun Chen ◽

Sri Nugroho ◽

Akira Kawasaki

Keyword(s):

Spark Plasma Sintering ◽

Matrix Composites ◽

Reactive Sintering ◽

Alumina Matrix ◽

Grain Sizes ◽

Plasma Sintering ◽

Spark Plasma ◽

Al2o3 Phase ◽

Al2o3 Matrix

Al2O3 matrix composites reinforced with Ba-b-Al2O3 phase were synthesized through reactive sintering using Al2O3 and BaCO3 as starting powders. Dense Al2O3/Ba-b-Al2O3 composites can be obtained by spark plasma sintering from Al2O3/BaO•Al2O3 powder, which was prepared by calcining Al2O3/BaCO3 powder mixture. The Ba-b-Al2O3 reinforcing phase exhibited an elongated morphology due to preferred diffusion of Ba cations. The existence of Ba-b-Al2O3 phase as well as low sintering temperature and short holding time during reactive sintering inhibit grain growth and thus result in small grain sizes of the Al2O3 matrix.

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Spark plasma sintering as a reactive sintering tool for the preparation of surface-tailored Fe–FeAl2O4–Al2O3 nanocomposites

Scripta Materialia ◽

10.1016/j.scriptamat.2008.09.034 ◽

2009 ◽

Vol 60 (4) ◽

pp. 195-198 ◽

Cited By ~ 19

Author(s):

J. Gurt Santanach ◽

C. Estournès ◽

A. Weibel ◽

A. Peigney ◽

G. Chevallier ◽

...

Keyword(s):

Spark Plasma Sintering ◽

Reactive Sintering ◽

Plasma Sintering ◽

Spark Plasma

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Fabrication of Y2Ti2O7 Transparent Ceramic by Spark Plasma Sintering

Materials Science Forum ◽

10.4028/www.scientific.net/msf.1035.663 ◽

2021 ◽

Vol 1035 ◽

pp. 663-667

Author(s):

Li Qiong An ◽

Rong Wei Shi ◽

Run Hua Fan ◽

Takashi Goto

Keyword(s):

Grain Size ◽

Spark Plasma Sintering ◽

Pyrochlore Structure ◽

Transparent Ceramic ◽

Sintered Body ◽

Reactive Sintering ◽

Uniform Microstructure ◽

Plasma Sintering ◽

Average Grain Size ◽

Spark Plasma

Y2Ti2O7 transparent ceramic was fabricated by reactive sintering using spark plasma sintering at 1673 K for 2.7 ks. The sintered body exhibited a cubic pyrochlore structure and uniform microstructure with an average grain size of 2.9 μm. The transmittance reached 73% at a wavelength of 2000 nm after annealing at 1023 K for 21.6 ks.

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Preparation of TiB2-TiN and TiN-B Powders and their Processing

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.527.32 ◽

2012 ◽

Vol 527 ◽

pp. 32-37

Author(s):

J. Grabis ◽

Ints Šteins ◽

Dz. Rašmane

Keyword(s):

Grain Size ◽

Relative Density ◽

Grain Growth ◽

Spark Plasma Sintering ◽

Amorphous Boron ◽

Reactive Sintering ◽

Plasma Technique ◽

Sintering Time ◽

Plasma Sintering ◽

Spark Plasma

TiN and TiN/TiBSubscript text2 nanoparticles with crystallite size of TiN in the range of 27–38 nm and TiBSubscript text2 in the range of 55–90 nm have been prepared by thermal plasma technique. The prepared nanoparticles and mechanical mixture of TiN with amorphous boron have been densified using spark plasma sintering and the microstructure and density of the samples were compared. The relative density of the samples with content of TiBSubscript text2 about 36 wt.% is in the range of 95.9–97.1% in dependence on the precursors. The higher relative density of the samples provided reactive sintering of TiN/B powder. The grain size of the composites in the range of 0.5–3 µm testified that spark plasma sintering intensified the grain growth in despite of the short sintering time.

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Preparation of TiAl15Si15 alloy by High Pressure Spark Plasma Sintering

Acta Metallurgica Slovaca ◽

10.12776/ams.v24i2.1064 ◽

2018 ◽

Vol 24 (2) ◽

pp. 174

Author(s):

Anna Knaislová ◽

Pavel Novák ◽

Filip Průša ◽

Sławomir Cygan ◽

Lucyna Jaworska

Keyword(s):

Mechanical Properties ◽

High Pressure ◽

Powder Metallurgy ◽

Spark Plasma Sintering ◽

Elevated Temperatures ◽

Reactive Sintering ◽

Compact Sample ◽

Plasma Sintering ◽

Spark Plasma ◽

Sintering Method

<p class="AMSmaintext"><span lang="EN-GB">This work deals with preparation of intermetallic alloy TiAl15Si15 (wt. %) by powder metallurgy using Spark Plasma Sintering method. Ti-Al-Si alloys are known as materials with low density, relatively good mechanical properties in comparison with their density and good oxidation and corrosion resistance at elevated temperatures. Preparation of intermetallics by melting metallurgy is very problematic. Powder metallurgy using reactive sintering followed by suitable compaction seems to be a promising method. In this work, TiAl15Si15 alloy was prepared by reactive sintering, milling and by unique ultra-high pressure Spark Plasma Sintering within the framework of international cooperation in Krakow. For the comparison it was also prepared by conventional Spark Plasma Sintering. The results show that higher pressure of sintering decreases the porosity of compact sample and increases mechanical properties, especially hardness.</span></p>

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